diff --git a/core/src/main/java/com/taobao/arthas/core/command/basic1000/CatCommand.java b/core/src/main/java/com/taobao/arthas/core/command/basic1000/CatCommand.java
index d10efaf0c..9cb3c7fcb 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/basic1000/CatCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/basic1000/CatCommand.java
@@ -5,6 +5,7 @@ import java.io.IOException;
 import java.nio.charset.Charset;
 import java.util.List;
 
+import com.taobao.arthas.core.command.model.CatModel;
 import com.alibaba.arthas.deps.org.slf4j.Logger;
 import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
 import com.taobao.arthas.core.shell.cli.Completion;
@@ -24,6 +25,8 @@ public class CatCommand extends AnnotatedCommand {
     private static final Logger logger = LoggerFactory.getLogger(CatCommand.class);
     private List<String> files;
     private String encoding;
+    private Integer sizeLimit = 128 * 1024;
+    private int maxSizeLimit = 8 * 1024 * 1024;
 
     @Argument(argName = "files", index = 0)
     @Description("files")
@@ -37,37 +40,43 @@ public class CatCommand extends AnnotatedCommand {
         this.encoding = encoding;
     }
 
+    @Option(shortName = "M", longName = "sizeLimit")
+    @Description("Upper size limit in bytes for the result (128 * 1024 by default, the maximum value is 8 * 1024 * 1024)")
+    public void setSizeLimit(Integer sizeLimit) {
+        this.sizeLimit = sizeLimit;
+    }
+
     @Override
     public void process(CommandProcess process) {
+        if (!verifyOptions(process)) {
+            return;
+        }
+
         for (String file : files) {
             File f = new File(file);
             if (!f.exists()) {
-                process.write("cat " + file + ": No such file or directory\n");
-                process.end();
+                process.end(-1, "cat " + file + ": No such file or directory");
                 return;
             }
             if (f.isDirectory()) {
-                process.write("cat " + file + ": Is a directory\n");
-                process.end();
+                process.end(-1, "cat " + file + ": Is a directory");
                 return;
             }
         }
 
         for (String file : files) {
             File f = new File(file);
-            if (f.length() > 1024 * 1024 * 8) {
-                process.write("cat " + file + ": Is to large, size: " + f.length() + '\n');
-                process.end();
+            if (f.length() > sizeLimit) {
+                process.end(-1, "cat " + file + ": Is too large, size: " + f.length());
                 return;
             }
             try {
                 String fileToString = FileUtils.readFileToString(f,
-                                encoding == null ? Charset.defaultCharset() : Charset.forName(encoding));
-                process.write(fileToString);
+                        encoding == null ? Charset.defaultCharset() : Charset.forName(encoding));
+                process.appendResult(new CatModel(file, fileToString));
             } catch (IOException e) {
                 logger.error("cat read file error. name: " + file, e);
-                process.write("cat read file error: " + e.getMessage() + '\n');
-                process.end(1);
+                process.end(1, "cat read file error: " + e.getMessage());
                 return;
             }
         }
@@ -75,6 +84,22 @@ public class CatCommand extends AnnotatedCommand {
         process.end();
     }
 
+    private boolean verifyOptions(CommandProcess process) {
+        if (sizeLimit > maxSizeLimit) {
+            process.end(-1, "sizeLimit cannot be large than: " + maxSizeLimit);
+            return false;
+        }
+
+        //目前不支持过滤，限制http请求执行的文件大小
+        int maxSizeLimitOfHttp = 128 * 1024;
+        boolean isHttpApiRequest = !process.session().isTty();
+        if (isHttpApiRequest && sizeLimit > maxSizeLimitOfHttp) {
+            process.end(-1, "When executing commands with http, sizeLimit cannot be large than: " + maxSizeLimitOfHttp);
+            return false;
+        }
+        return true;
+    }
+
     @Override
     public void complete(Completion completion) {
         if (!CompletionUtils.completeFilePath(completion)) {
diff --git a/core/src/main/java/com/taobao/arthas/core/command/basic1000/EchoCommand.java b/core/src/main/java/com/taobao/arthas/core/command/basic1000/EchoCommand.java
index 89cc62f46..b1db3f084 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/basic1000/EchoCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/basic1000/EchoCommand.java
@@ -1,6 +1,8 @@
 package com.taobao.arthas.core.command.basic1000;
 
 import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.EchoModel;
+import com.taobao.arthas.core.command.model.MessageModel;
 import com.taobao.arthas.core.shell.command.AnnotatedCommand;
 import com.taobao.arthas.core.shell.command.CommandProcess;
 import com.taobao.middleware.cli.annotations.Argument;
@@ -30,8 +32,7 @@ public class EchoCommand extends AnnotatedCommand {
     @Override
     public void process(CommandProcess process) {
         if (message != null) {
-            process.write(message);
-            process.write("\n");
+            process.appendResult(new EchoModel(message));
         }
 
         process.end();
diff --git a/core/src/main/java/com/taobao/arthas/core/command/basic1000/HelpCommand.java b/core/src/main/java/com/taobao/arthas/core/command/basic1000/HelpCommand.java
index 215c6cd8e..6e1d5f23e 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/basic1000/HelpCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/basic1000/HelpCommand.java
@@ -1,5 +1,9 @@
 package com.taobao.arthas.core.command.basic1000;
 
+import com.taobao.arthas.core.command.model.ArgumentVO;
+import com.taobao.arthas.core.command.model.CommandOptionVO;
+import com.taobao.arthas.core.command.model.CommandVO;
+import com.taobao.arthas.core.command.model.HelpModel;
 import com.taobao.arthas.core.shell.cli.Completion;
 import com.taobao.arthas.core.shell.cli.CompletionUtils;
 import com.taobao.arthas.core.shell.command.AnnotatedCommand;
@@ -9,24 +13,15 @@ import com.taobao.arthas.core.shell.command.CommandResolver;
 import com.taobao.arthas.core.shell.session.Session;
 import com.taobao.arthas.core.util.usage.StyledUsageFormatter;
 import com.taobao.middleware.cli.CLI;
+import com.taobao.middleware.cli.Option;
 import com.taobao.middleware.cli.annotations.Argument;
 import com.taobao.middleware.cli.annotations.Description;
 import com.taobao.middleware.cli.annotations.Name;
 import com.taobao.middleware.cli.annotations.Summary;
-import com.taobao.text.Color;
-import com.taobao.text.Decoration;
-import com.taobao.text.Style;
-import com.taobao.text.ui.Element;
-import com.taobao.text.ui.LabelElement;
-import com.taobao.text.ui.TableElement;
-import com.taobao.text.util.RenderUtil;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import static com.taobao.text.ui.Element.label;
-import static com.taobao.text.ui.Element.row;
-
 /**
  * @author vlinux on 14/10/26.
  */
@@ -47,16 +42,91 @@ public class HelpCommand extends AnnotatedCommand {
     public void process(CommandProcess process) {
         List<Command> commands = allCommands(process.session());
         Command targetCmd = findCommand(commands);
-        String message;
         if (targetCmd == null) {
-            message = RenderUtil.render(mainHelp(commands), process.width());
+            process.appendResult(createHelpModel(commands));
         } else {
-            message = commandHelp(targetCmd, process.width());
+            process.appendResult(createHelpDetailModel(targetCmd));
         }
-        process.write(message);
         process.end();
     }
 
+    public HelpModel createHelpDetailModel(Command targetCmd) {
+        return new HelpModel(createCommandVO(targetCmd, true));
+    }
+
+    private HelpModel createHelpModel(List<Command> commands) {
+        HelpModel helpModel = new HelpModel();
+        for (Command command : commands) {
+            if(command.cli() == null || command.cli().isHidden()){
+                continue;
+            }
+            helpModel.addCommandVO(createCommandVO(command, false));
+        }
+        return helpModel;
+    }
+
+    private CommandVO createCommandVO(Command command, boolean withDetail) {
+        CLI cli = command.cli();
+        CommandVO commandVO = new CommandVO();
+        commandVO.setName(command.name());
+        if (cli!=null){
+            commandVO.setSummary(cli.getSummary());
+            if (withDetail){
+                commandVO.setCli(cli);
+                StyledUsageFormatter usageFormatter = new StyledUsageFormatter(null);
+                String usageLine = usageFormatter.computeUsageLine(null, cli);
+                commandVO.setUsage(usageLine);
+                commandVO.setDescription(cli.getDescription());
+
+                //以线程安全的方式遍历options
+                List<Option> options = cli.getOptions();
+                for (int i = 0; i < options.size(); i++) {
+                    Option option = options.get(i);
+                    if (option.isHidden()){
+                        continue;
+                    }
+                    commandVO.addOption(createOptionVO(option));
+                }
+
+                //arguments
+                List<com.taobao.middleware.cli.Argument> arguments = cli.getArguments();
+                for (int i = 0; i < arguments.size(); i++) {
+                    com.taobao.middleware.cli.Argument argument = arguments.get(i);
+                    if (argument.isHidden()){
+                        continue;
+                    }
+                    commandVO.addArgument(createArgumentVO(argument));
+                }
+            }
+        }
+        return commandVO;
+    }
+
+    private ArgumentVO createArgumentVO(com.taobao.middleware.cli.Argument argument) {
+        ArgumentVO argumentVO = new ArgumentVO();
+        argumentVO.setArgName(argument.getArgName());
+        argumentVO.setMultiValued(argument.isMultiValued());
+        argumentVO.setRequired(argument.isRequired());
+        return argumentVO;
+    }
+
+    private CommandOptionVO createOptionVO(Option option) {
+        CommandOptionVO optionVO = new CommandOptionVO();
+        if (!isEmptyName(option.getLongName())) {
+            optionVO.setLongName(option.getLongName());
+        }
+        if (!isEmptyName(option.getShortName())) {
+            optionVO.setShortName(option.getShortName());
+        }
+        optionVO.setDescription(option.getDescription());
+        optionVO.setAcceptValue(option.acceptValue());
+        return optionVO;
+    }
+
+    private boolean isEmptyName(String name) {
+        return name == null || name.equals(Option.NO_NAME);
+    }
+
     @Override
     public void complete(Completion completion) {
         List<Command> commands = allCommands(completion.session());
@@ -72,24 +142,6 @@ public class HelpCommand extends AnnotatedCommand {
         CompletionUtils.complete(completion, names);
     }
 
-    private static String commandHelp(Command command, int width) {
-        return StyledUsageFormatter.styledUsage(command.cli(), width);
-    }
-
-    private static Element mainHelp(List<Command> commands) {
-        TableElement table = new TableElement().leftCellPadding(1).rightCellPadding(1);
-        table.row(new LabelElement("NAME").style(Style.style(Decoration.bold)), new LabelElement("DESCRIPTION"));
-        for (Command command : commands) {
-            CLI cli = command.cli();
-            // com.taobao.arthas.core.shell.impl.BuiltinCommandResolver doesn't have CLI instance
-            if (cli == null || cli.isHidden()) {
-                continue;
-            }
-            table.add(row().add(label(cli.getName()).style(Style.style(Color.green))).add(label(cli.getSummary())));
-        }
-        return table;
-    }
-
     private List<Command> allCommands(Session session) {
         List<CommandResolver> commandResolvers = session.getCommandResolvers();
         List<Command> commands = new ArrayList<Command>();
diff --git a/core/src/main/java/com/taobao/arthas/core/command/basic1000/HistoryCommand.java b/core/src/main/java/com/taobao/arthas/core/command/basic1000/HistoryCommand.java
index f2c919fdd..a0a407a10 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/basic1000/HistoryCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/basic1000/HistoryCommand.java
@@ -4,8 +4,11 @@ import java.util.ArrayList;
 import java.util.List;
 
 import com.taobao.arthas.core.command.Constants;
+import com.taobao.arthas.core.command.model.HistoryModel;
 import com.taobao.arthas.core.shell.command.AnnotatedCommand;
 import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.shell.history.HistoryManager;
+import com.taobao.arthas.core.shell.history.impl.HistoryManagerImpl;
 import com.taobao.arthas.core.shell.session.Session;
 import com.taobao.arthas.core.shell.term.impl.TermImpl;
 import com.taobao.middleware.cli.annotations.Argument;
@@ -69,6 +72,14 @@ public class HistoryCommand extends AnnotatedCommand {
 
                 process.write(sb.toString());
             }
+        } else {
+            if (clear) {
+                HistoryManagerImpl.getInstance().clearHistory();
+            } else {
+                //http api
+                List<String> history = HistoryManagerImpl.getInstance().getHistory();
+                process.appendResult(new HistoryModel(new ArrayList<String>(history)));
+            }
         }
 
         process.end();
diff --git a/core/src/main/java/com/taobao/arthas/core/command/basic1000/ShutdownCommand.java b/core/src/main/java/com/taobao/arthas/core/command/basic1000/ShutdownCommand.java
index 7fc2bd63c..7c2faf452 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/basic1000/ShutdownCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/basic1000/ShutdownCommand.java
@@ -1,9 +1,11 @@
 package com.taobao.arthas.core.command.basic1000;
 
 import com.taobao.arthas.core.advisor.Enhancer;
+import com.taobao.arthas.core.server.ArthasBootstrap;
 import com.taobao.arthas.core.shell.ShellServer;
 import com.taobao.arthas.core.shell.command.AnnotatedCommand;
 import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.shell.session.SessionManager;
 import com.taobao.arthas.core.util.affect.EnhancerAffect;
 import com.taobao.arthas.core.util.matcher.WildcardMatcher;
 import com.taobao.middleware.cli.annotations.Hidden;
@@ -39,8 +41,15 @@ public class ShutdownCommand extends AnnotatedCommand {
             // ignore
         } finally {
             process.end();
-            ShellServer server = process.session().getServer();
-            server.close();
+            ShellServer server = ArthasBootstrap.getInstance().getShellServer();
+            if (server != null) {
+                server.close();
+            }
+
+            SessionManager sessionManager = ArthasBootstrap.getInstance().getSessionManager();
+            if (sessionManager != null){
+                sessionManager.close();
+            }
         }
     }
 }
diff --git a/core/src/main/java/com/taobao/arthas/core/command/basic1000/VersionCommand.java b/core/src/main/java/com/taobao/arthas/core/command/basic1000/VersionCommand.java
index 04b607736..b46ed80b8 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/basic1000/VersionCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/basic1000/VersionCommand.java
@@ -1,6 +1,7 @@
 package com.taobao.arthas.core.command.basic1000;
 
 
+import com.taobao.arthas.core.command.model.VersionModel;
 import com.taobao.arthas.core.shell.command.AnnotatedCommand;
 import com.taobao.arthas.core.shell.command.CommandProcess;
 import com.taobao.arthas.core.util.ArthasBanner;
@@ -15,8 +16,13 @@ import com.taobao.middleware.cli.annotations.Summary;
 @Name("version")
 @Summary("Display Arthas version")
 public class VersionCommand extends AnnotatedCommand {
+
     @Override
     public void process(CommandProcess process) {
-        process.write(ArthasBanner.version()).write("\n").end();
+        VersionModel result = new VersionModel();
+        result.setVersion(ArthasBanner.version());
+        process.appendResult(result);
+        process.end();
     }
+
 }
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/ArgumentVO.java b/core/src/main/java/com/taobao/arthas/core/command/model/ArgumentVO.java
new file mode 100644
index 000000000..d2b4bb13b
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/ArgumentVO.java
@@ -0,0 +1,43 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * @author gongdewei 2020/4/3
+ */
+public class ArgumentVO {
+    private String argName;
+    private boolean required;
+    private boolean multiValued;
+
+    public ArgumentVO() {
+    }
+
+    public ArgumentVO(String argName, boolean required, boolean multiValued) {
+        this.argName = argName;
+        this.required = required;
+        this.multiValued = multiValued;
+    }
+
+    public String getArgName() {
+        return argName;
+    }
+
+    public void setArgName(String argName) {
+        this.argName = argName;
+    }
+
+    public boolean isRequired() {
+        return required;
+    }
+
+    public void setRequired(boolean required) {
+        this.required = required;
+    }
+
+    public boolean isMultiValued() {
+        return multiValued;
+    }
+
+    public void setMultiValued(boolean multiValued) {
+        this.multiValued = multiValued;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/CatModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/CatModel.java
new file mode 100644
index 000000000..aa4e3f2cc
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/CatModel.java
@@ -0,0 +1,49 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * Result model for CatCommand
+ * @author gongdewei 2020/5/11
+ */
+public class CatModel extends ResultModel implements Countable {
+
+    private String file;
+    private String content;
+
+    public CatModel() {
+    }
+
+    public CatModel(String file, String content) {
+        this.file = file;
+        this.content = content;
+    }
+
+    @Override
+    public String getType() {
+        return "cat";
+    }
+
+    public String getFile() {
+        return file;
+    }
+
+    public void setFile(String file) {
+        this.file = file;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    @Override
+    public int size() {
+        if (content != null) {
+            //粗略计算行数作为item size
+            return content.length()/100 + 1;
+        }
+        return 0;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/CommandOptionVO.java b/core/src/main/java/com/taobao/arthas/core/command/model/CommandOptionVO.java
new file mode 100644
index 000000000..7289bdedf
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/CommandOptionVO.java
@@ -0,0 +1,62 @@
+package com.taobao.arthas.core.command.model;
+
+
+/**
+ * @author gongdewei 2020/4/3
+ */
+public class CommandOptionVO {
+    /**
+     * the option long name.
+     */
+    private String longName;
+
+    /**
+     * the option short name.
+     */
+    private String shortName;
+
+    /**
+     * The option description.
+     */
+    private String description;
+
+    /**
+     * whether or not the option receives a single value or  multiple values.
+     */
+    private boolean acceptValue;
+
+    public CommandOptionVO() {
+    }
+
+    public String getLongName() {
+        return longName;
+    }
+
+    public void setLongName(String longName) {
+        this.longName = longName;
+    }
+
+    public String getShortName() {
+        return shortName;
+    }
+
+    public void setShortName(String shortName) {
+        this.shortName = shortName;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public boolean isAcceptValue() {
+        return acceptValue;
+    }
+
+    public void setAcceptValue(boolean acceptValue) {
+        this.acceptValue = acceptValue;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/CommandRequestModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/CommandRequestModel.java
new file mode 100644
index 000000000..47b6f5306
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/CommandRequestModel.java
@@ -0,0 +1,54 @@
+package com.taobao.arthas.core.command.model;
+
+import com.taobao.arthas.core.shell.term.impl.http.api.ApiState;
+
+/**
+ * Command async exec process result, not the command exec result
+ * @author gongdewei 2020/4/2
+ */
+public class CommandRequestModel extends ResultModel {
+
+    private ApiState state;
+    private String command;
+    private String message;
+
+    public CommandRequestModel(String command, ApiState state) {
+        this.command = command;
+        this.state = state;
+    }
+
+    public CommandRequestModel(String command, ApiState state, String message) {
+        this.state = state;
+        this.command = command;
+        this.message = message;
+    }
+
+    public String getCommand() {
+        return command;
+    }
+
+    public void setCommand(String command) {
+        this.command = command;
+    }
+
+    public ApiState getState() {
+        return state;
+    }
+
+    public void setState(ApiState state) {
+        this.state = state;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    @Override
+    public String getType() {
+        return "command";
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/CommandVO.java b/core/src/main/java/com/taobao/arthas/core/command/model/CommandVO.java
new file mode 100644
index 000000000..a21e6a276
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/CommandVO.java
@@ -0,0 +1,94 @@
+package com.taobao.arthas.core.command.model;
+
+import com.taobao.middleware.cli.CLI;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author gongdewei 2020/4/3
+ */
+public class CommandVO {
+    //TODO remove cli
+    private transient CLI cli;
+    private String name;
+    private String description;
+    private String usage;
+    private String summary;
+    private List<CommandOptionVO> options = new ArrayList<CommandOptionVO>();
+    private List<ArgumentVO> arguments = new ArrayList<ArgumentVO>();
+
+    public CommandVO() {
+    }
+
+    public CommandVO(String name, String description) {
+        this.name = name;
+        this.description = description;
+    }
+
+    public CommandVO addOption(CommandOptionVO optionVO){
+        this.options.add(optionVO);
+        return this;
+    }
+
+    public CommandVO addArgument(ArgumentVO argumentVO){
+        this.arguments.add(argumentVO);
+        return this;
+    }
+
+    public CLI cli() {
+        return cli;
+    }
+
+    public void setCli(CLI cli) {
+        this.cli = cli;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public String getUsage() {
+        return usage;
+    }
+
+    public void setUsage(String usage) {
+        this.usage = usage;
+    }
+
+    public String getSummary() {
+        return summary;
+    }
+
+    public void setSummary(String summary) {
+        this.summary = summary;
+    }
+
+    public List<CommandOptionVO> getOptions() {
+        return options;
+    }
+
+    public void setOptions(List<CommandOptionVO> options) {
+        this.options = options;
+    }
+
+    public List<ArgumentVO> getArguments() {
+        return arguments;
+    }
+
+    public void setArguments(List<ArgumentVO> arguments) {
+        this.arguments = arguments;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/Countable.java b/core/src/main/java/com/taobao/arthas/core/command/model/Countable.java
new file mode 100644
index 000000000..3c955d0fe
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/Countable.java
@@ -0,0 +1,15 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * Item countable for ResultModel
+ * @author gongdewei 2020/6/8
+ */
+public interface Countable {
+
+    /**
+     * Get item size of this result model, the value of size is greater than or equal to 1
+     * @return item size of this result model
+     */
+    int size();
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/EchoModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/EchoModel.java
new file mode 100644
index 000000000..0b0287d87
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/EchoModel.java
@@ -0,0 +1,29 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * @author gongdewei 2020/5/11
+ */
+public class EchoModel extends ResultModel {
+
+    private String content;
+
+    public EchoModel() {
+    }
+
+    public EchoModel(String content) {
+        this.content = content;
+    }
+
+    @Override
+    public String getType() {
+        return "echo";
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/HelpModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/HelpModel.java
new file mode 100644
index 000000000..5471334e1
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/HelpModel.java
@@ -0,0 +1,51 @@
+package com.taobao.arthas.core.command.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author gongdewei 2020/4/3
+ */
+public class HelpModel extends ResultModel {
+
+    //list
+    private List<CommandVO> commands;
+
+    //details
+    private CommandVO detailCommand;
+
+    public HelpModel() {
+    }
+
+    public HelpModel(List<CommandVO> commands) {
+        this.commands = commands;
+    }
+
+    public HelpModel(CommandVO command) {
+        this.detailCommand = command;
+    }
+
+    public void addCommandVO(CommandVO commandVO){
+        if (commands == null) {
+            commands = new ArrayList<CommandVO>();
+        }
+        this.commands.add(commandVO);
+    }
+
+    public List<CommandVO> getCommands() {
+        return commands;
+    }
+
+    public void setCommands(List<CommandVO> commands) {
+        this.commands = commands;
+    }
+
+    public CommandVO getDetailCommand() {
+        return detailCommand;
+    }
+
+    @Override
+    public String getType() {
+        return "help";
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/HistoryModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/HistoryModel.java
new file mode 100644
index 000000000..34e545d8e
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/HistoryModel.java
@@ -0,0 +1,27 @@
+package com.taobao.arthas.core.command.model;
+
+import java.util.List;
+
+/**
+ * @author gongdewei 2020/4/8
+ */
+public class HistoryModel extends ResultModel {
+
+    private List<String> history;
+
+    public HistoryModel() {
+    }
+
+    public HistoryModel(List<String> history) {
+        this.history = history;
+    }
+
+    public List<String> getHistory() {
+        return history;
+    }
+
+    @Override
+    public String getType() {
+        return "history";
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/InputStatus.java b/core/src/main/java/com/taobao/arthas/core/command/model/InputStatus.java
new file mode 100644
index 000000000..182a4a2f9
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/InputStatus.java
@@ -0,0 +1,22 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * Command input status for webui
+ * @author gongdewei 2020/4/14
+ */
+public enum InputStatus {
+    /**
+     * Allow input new commands
+     */
+    ALLOW_INPUT,
+
+    /**
+     * Allow interrupt running job
+     */
+    ALLOW_INTERRUPT,
+
+    /**
+     * Disable input and interrupt
+     */
+    DISABLED
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/InputStatusModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/InputStatusModel.java
new file mode 100644
index 000000000..b1da685a0
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/InputStatusModel.java
@@ -0,0 +1,28 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * Input status for webui
+ * @author gongdewei 2020/4/14
+ */
+public class InputStatusModel extends ResultModel {
+
+    private InputStatus inputStatus;
+
+    public InputStatusModel(InputStatus inputStatus) {
+        this.inputStatus = inputStatus;
+    }
+
+    public InputStatus getInputStatus() {
+        return inputStatus;
+    }
+
+    public void setInputStatus(InputStatus inputStatus) {
+        this.inputStatus = inputStatus;
+    }
+
+    @Override
+    public String getType() {
+        return "input_status";
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/MessageModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/MessageModel.java
new file mode 100644
index 000000000..686629008
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/MessageModel.java
@@ -0,0 +1,24 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * @author gongdewei 2020/4/2
+ */
+public class MessageModel extends ResultModel {
+    private String message;
+
+    public MessageModel() {
+    }
+
+    public MessageModel(String message) {
+        this.message = message;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    @Override
+    public String getType() {
+        return "message";
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/ResultModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/ResultModel.java
new file mode 100644
index 000000000..99e0462f5
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/ResultModel.java
@@ -0,0 +1,27 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * Command execute result
+ *
+ * @author gongdewei 2020-03-26
+ */
+public abstract class ResultModel {
+
+    private int jobId;
+
+    /**
+     * Command type (name)
+     *
+     * @return
+     */
+    public abstract String getType();
+
+
+    public int getJobId() {
+        return jobId;
+    }
+
+    public void setJobId(int jobId) {
+        this.jobId = jobId;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/StatusModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/StatusModel.java
new file mode 100644
index 000000000..9af2439a0
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/StatusModel.java
@@ -0,0 +1,52 @@
+package com.taobao.arthas.core.command.model;
+
+public class StatusModel extends ResultModel {
+    private int statusCode;
+    private String message;
+
+    public StatusModel() {
+    }
+
+    public StatusModel(int statusCode) {
+        this.statusCode = statusCode;
+    }
+
+    public StatusModel(int statusCode, String message) {
+        this.statusCode = statusCode;
+        this.message = message;
+    }
+
+    public int getStatusCode() {
+        return statusCode;
+    }
+
+    public StatusModel setStatusCode(int statusCode) {
+        this.statusCode = statusCode;
+        return this;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public StatusModel setMessage(String message) {
+        this.message = message;
+        return this;
+    }
+
+    public StatusModel setStatus(int statusCode, String message) {
+        this.statusCode = statusCode;
+        this.message = message;
+        return this;
+    }
+
+    public StatusModel setStatus(int statusCode) {
+        return this.setStatus(statusCode, null);
+    }
+
+    @Override
+    public String getType() {
+        return "status";
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/VersionModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/VersionModel.java
new file mode 100644
index 000000000..ea2624133
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/VersionModel.java
@@ -0,0 +1,20 @@
+package com.taobao.arthas.core.command.model;
+
+public class VersionModel extends ResultModel {
+
+    private String version;
+
+    @Override
+    public String getType() {
+        return "version";
+    }
+
+    public String getVersion() {
+        return version;
+    }
+
+    public void setVersion(String version) {
+        this.version = version;
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/model/WelcomeModel.java b/core/src/main/java/com/taobao/arthas/core/command/model/WelcomeModel.java
new file mode 100644
index 000000000..11bafd572
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/model/WelcomeModel.java
@@ -0,0 +1,61 @@
+package com.taobao.arthas.core.command.model;
+
+/**
+ * @author gongdewei 2020/4/20
+ */
+public class WelcomeModel extends ResultModel {
+
+    private String pid;
+    private String time;
+    private String version;
+    private String wiki;
+    private String tutorials;
+
+    public WelcomeModel() {
+    }
+
+    @Override
+    public String getType() {
+        return "welcome";
+    }
+
+    public String getPid() {
+        return pid;
+    }
+
+    public void setPid(String pid) {
+        this.pid = pid;
+    }
+
+    public String getTime() {
+        return time;
+    }
+
+    public void setTime(String time) {
+        this.time = time;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+
+    public void setVersion(String version) {
+        this.version = version;
+    }
+
+    public String getWiki() {
+        return wiki;
+    }
+
+    public void setWiki(String wiki) {
+        this.wiki = wiki;
+    }
+
+    public String getTutorials() {
+        return tutorials;
+    }
+
+    public void setTutorials(String tutorials) {
+        this.tutorials = tutorials;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/view/CatView.java b/core/src/main/java/com/taobao/arthas/core/command/view/CatView.java
new file mode 100644
index 000000000..4d21c4941
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/view/CatView.java
@@ -0,0 +1,17 @@
+package com.taobao.arthas.core.command.view;
+
+import com.taobao.arthas.core.command.model.CatModel;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+/**
+ * Result view for CatCommand
+ * @author gongdewei 2020/5/11
+ */
+public class CatView extends ResultView<CatModel> {
+
+    @Override
+    public void draw(CommandProcess process, CatModel result) {
+        process.write(result.getContent()).write("\n");
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/view/EchoView.java b/core/src/main/java/com/taobao/arthas/core/command/view/EchoView.java
new file mode 100644
index 000000000..0178af5c9
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/view/EchoView.java
@@ -0,0 +1,14 @@
+package com.taobao.arthas.core.command.view;
+
+import com.taobao.arthas.core.command.model.EchoModel;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+/**
+ * @author gongdewei 2020/5/11
+ */
+public class EchoView extends ResultView<EchoModel> {
+    @Override
+    public void draw(CommandProcess process, EchoModel result) {
+        process.write(result.getContent()).write("\n");
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/view/HelpView.java b/core/src/main/java/com/taobao/arthas/core/command/view/HelpView.java
new file mode 100644
index 000000000..0d865a0cf
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/view/HelpView.java
@@ -0,0 +1,48 @@
+package com.taobao.arthas.core.command.view;
+
+import com.taobao.arthas.core.command.model.CommandVO;
+import com.taobao.arthas.core.command.model.HelpModel;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+import com.taobao.arthas.core.util.usage.StyledUsageFormatter;
+import com.taobao.middleware.cli.CLI;
+import com.taobao.text.Color;
+import com.taobao.text.Decoration;
+import com.taobao.text.Style;
+import com.taobao.text.ui.Element;
+import com.taobao.text.ui.LabelElement;
+import com.taobao.text.ui.TableElement;
+import com.taobao.text.util.RenderUtil;
+
+import java.util.List;
+
+import static com.taobao.text.ui.Element.label;
+import static com.taobao.text.ui.Element.row;
+
+/**
+ * @author gongdewei 2020/4/3
+ */
+public class HelpView extends ResultView<HelpModel> {
+
+    @Override
+    public void draw(CommandProcess process, HelpModel result) {
+        if (result.getCommands() != null) {
+            String message = RenderUtil.render(mainHelp(result.getCommands()), process.width());
+            process.write(message);
+        } else if (result.getDetailCommand() != null) {
+            process.write(commandHelp(result.getDetailCommand().cli(), process.width()));
+        }
+    }
+
+    private static Element mainHelp(List<CommandVO> commands) {
+        TableElement table = new TableElement().leftCellPadding(1).rightCellPadding(1);
+        table.row(new LabelElement("NAME").style(Style.style(Decoration.bold)), new LabelElement("DESCRIPTION"));
+        for (CommandVO commandVO : commands) {
+            table.add(row().add(label(commandVO.getName()).style(Style.style(Color.green))).add(label(commandVO.getSummary())));
+        }
+        return table;
+    }
+
+    private static String commandHelp(CLI command, int width) {
+        return StyledUsageFormatter.styledUsage(command, width);
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/view/MessageView.java b/core/src/main/java/com/taobao/arthas/core/command/view/MessageView.java
new file mode 100644
index 000000000..f1846113d
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/view/MessageView.java
@@ -0,0 +1,14 @@
+package com.taobao.arthas.core.command.view;
+
+import com.taobao.arthas.core.command.model.MessageModel;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+/**
+ * @author gongdewei 2020/4/2
+ */
+public class MessageView extends ResultView<MessageModel> {
+    @Override
+    public void draw(CommandProcess process, MessageModel result) {
+        writeln(process, result.getMessage());
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/view/ResultView.java b/core/src/main/java/com/taobao/arthas/core/command/view/ResultView.java
new file mode 100644
index 000000000..674955dbc
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/view/ResultView.java
@@ -0,0 +1,30 @@
+package com.taobao.arthas.core.command.view;
+
+import com.taobao.arthas.core.command.model.ResultModel;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+/**
+ * Command result view for telnet term/tty.
+ * Note: Result view is a reusable and stateless instance
+ *
+ * @author gongdewei 2020/3/27
+ */
+public abstract class ResultView<T extends ResultModel> {
+
+    /**
+     * formatted printing data to term/tty
+     *
+     * @param process
+     */
+    public abstract void draw(CommandProcess process, T result);
+
+    /**
+     * write str and append a new line
+     *
+     * @param process
+     * @param str
+     */
+    protected void writeln(CommandProcess process, String str) {
+        process.write(str).write("\n");
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/view/ResultViewResolver.java b/core/src/main/java/com/taobao/arthas/core/command/view/ResultViewResolver.java
new file mode 100644
index 000000000..6e8c3fce4
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/view/ResultViewResolver.java
@@ -0,0 +1,105 @@
+package com.taobao.arthas.core.command.view;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.core.command.model.*;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+import java.lang.reflect.Method;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Result view resolver for term
+ *
+ * @author gongdewei 2020/3/27
+ */
+public class ResultViewResolver {
+    private static final Logger logger = LoggerFactory.getLogger(ResultViewResolver.class);
+
+    // modelClass -> view
+    private Map<Class, ResultView> resultViewMap = new ConcurrentHashMap<Class, ResultView>();
+
+    private static ResultViewResolver viewResolver;
+
+    public static ResultViewResolver getInstance() {
+        if (viewResolver == null) {
+            synchronized (ResultViewResolver.class) {
+                viewResolver = new ResultViewResolver();
+            }
+        }
+        return viewResolver;
+    }
+
+    static {
+        getInstance().registerResultViews();
+    }
+
+    private void registerResultViews() {
+        try {
+            registerView(StatusView.class);
+            registerView(VersionView.class);
+            registerView(MessageView.class);
+            registerView(HelpView.class);
+            //registerView(HistoryView.class);
+            registerView(EchoView.class);
+            registerView(CatView.class);
+        } catch (Throwable e) {
+            logger.error("register result view failed", e);
+        }
+    }
+
+    private ResultViewResolver() {
+    }
+
+    public ResultView getResultView(ResultModel model) {
+        return resultViewMap.get(model.getClass());
+    }
+
+    public void registerView(Class modelClass, ResultView view) {
+        //TODO 检查model的type是否重复，减少复制代码带来的bug
+        this.resultViewMap.put(modelClass, view);
+    }
+
+    public void registerView(ResultView view) {
+        Class modelClass = getModelClass(view);
+        if (modelClass == null) {
+            throw new NullPointerException("model class is null");
+        }
+        this.registerView(modelClass, view);
+    }
+
+    public void registerView(Class<? extends ResultView> viewClass) {
+        ResultView view = null;
+        try {
+            view = viewClass.newInstance();
+        } catch (Throwable e) {
+            throw new RuntimeException("create view instance failure, viewClass:" + viewClass, e);
+        }
+        this.registerView(view);
+    }
+
+    /**
+     * Get model class of result view
+     *
+     * @return
+     */
+    public static <V extends ResultView> Class getModelClass(V view) {
+        //类反射获取子类的draw方法第二个参数的ResultModel具体类型
+        Class<? extends ResultView> viewClass = view.getClass();
+        Method[] declaredMethods = viewClass.getDeclaredMethods();
+        for (int i = 0; i < declaredMethods.length; i++) {
+            Method method = declaredMethods[i];
+            if (method.getName().equals("draw")) {
+                Class<?>[] parameterTypes = method.getParameterTypes();
+                if (parameterTypes.length == 2
+                        && parameterTypes[0] == CommandProcess.class
+                        && parameterTypes[1] != ResultModel.class
+                        && ResultModel.class.isAssignableFrom(parameterTypes[1])) {
+                    return parameterTypes[1];
+                }
+            }
+        }
+        return null;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/view/StatusView.java b/core/src/main/java/com/taobao/arthas/core/command/view/StatusView.java
new file mode 100644
index 000000000..6ea60c9d0
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/view/StatusView.java
@@ -0,0 +1,18 @@
+package com.taobao.arthas.core.command.view;
+
+import com.taobao.arthas.core.command.model.StatusModel;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+/**
+ * @author gongdewei 2020/3/27
+ */
+public class StatusView extends ResultView<StatusModel> {
+
+    @Override
+    public void draw(CommandProcess process, StatusModel result) {
+        if (result.getMessage() != null) {
+            writeln(process, result.getMessage());
+        }
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/command/view/VersionView.java b/core/src/main/java/com/taobao/arthas/core/command/view/VersionView.java
new file mode 100644
index 000000000..dd6bf34e1
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/command/view/VersionView.java
@@ -0,0 +1,16 @@
+package com.taobao.arthas.core.command.view;
+
+import com.taobao.arthas.core.command.model.VersionModel;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+/**
+ * @author gongdewei 2020/3/27
+ */
+public class VersionView extends ResultView<VersionModel> {
+
+    @Override
+    public void draw(CommandProcess process, VersionModel result) {
+        writeln(process, result.getVersion());
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/CompositeResultDistributor.java b/core/src/main/java/com/taobao/arthas/core/distribution/CompositeResultDistributor.java
new file mode 100644
index 000000000..dd4137d1b
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/CompositeResultDistributor.java
@@ -0,0 +1,12 @@
+package com.taobao.arthas.core.distribution;
+
+/**
+ * 复合结果分发器，将消息同时分发给其包含的多个真实分发器
+ * @author gongdewei 2020/4/30
+ */
+public interface CompositeResultDistributor extends ResultDistributor {
+
+    void addDistributor(ResultDistributor distributor);
+
+    void removeDistributor(ResultDistributor distributor);
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/DistributorOptions.java b/core/src/main/java/com/taobao/arthas/core/distribution/DistributorOptions.java
new file mode 100644
index 000000000..f7d7e59e9
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/DistributorOptions.java
@@ -0,0 +1,14 @@
+package com.taobao.arthas.core.distribution;
+
+/**
+ * 命令结果分发器选项
+ * @author gongdewei 2020/5/18
+ */
+public class DistributorOptions {
+
+    /**
+     * ResultConsumer的结果队列长度，用于控制内存缓存的命令结果数据量
+     */
+    public static int resultQueueSize = 50;
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/PackingResultDistributor.java b/core/src/main/java/com/taobao/arthas/core/distribution/PackingResultDistributor.java
new file mode 100644
index 000000000..2e5e3b8b5
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/PackingResultDistributor.java
@@ -0,0 +1,14 @@
+package com.taobao.arthas.core.distribution;
+
+import com.taobao.arthas.core.command.model.ResultModel;
+
+import java.util.List;
+
+public interface PackingResultDistributor extends ResultDistributor {
+
+    /**
+     * Get results of command
+     */
+    List<ResultModel> getResults();
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumer.java b/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumer.java
new file mode 100644
index 000000000..e9d62f432
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumer.java
@@ -0,0 +1,43 @@
+package com.taobao.arthas.core.distribution;
+
+import com.taobao.arthas.core.command.model.ResultModel;
+
+import java.util.List;
+
+/**
+ * Command result consumer
+ * @author gongdewei 2020-03-26
+ */
+public interface ResultConsumer {
+
+    /**
+     * Append the phased result to queue
+     * @param result a phased result of the command
+     * @return true means distribution success, return false means discard data
+     */
+    boolean appendResult(ResultModel result);
+
+    /**
+     * Retrieves and removes a pack of results from the head
+     * @return a pack of results
+     */
+    List<ResultModel> pollResults();
+
+    long getLastAccessTime();
+
+    void close();
+
+    boolean isClosed();
+
+    boolean isPolling();
+
+    String getConsumerId();
+
+    void setConsumerId(String consumerId);
+
+    /**
+     * Retrieves the consumer's health status
+     * @return
+     */
+    boolean isHealthy();
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumerHelper.java b/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumerHelper.java
new file mode 100644
index 000000000..ee29b9acb
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/ResultConsumerHelper.java
@@ -0,0 +1,94 @@
+package com.taobao.arthas.core.distribution;
+
+import com.alibaba.fastjson.JSON;
+import com.taobao.arthas.core.command.model.Countable;
+import com.taobao.arthas.core.command.model.ResultModel;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * 命令结果模型辅助类
+ *
+ * @author gongdewei 2020/5/18
+ */
+public class ResultConsumerHelper {
+
+    private static final Logger logger = LoggerFactory.getLogger(ResultConsumerHelper.class);
+
+    private static ConcurrentHashMap<String, List<Field>> modelFieldMap = new ConcurrentHashMap<String, List<Field>>();
+
+    /**
+     * 估算命令执行结果的item数量，目的是提供一个度量值，作为Consumer分发时进行切片的参考依据，避免单次发送大量数据。
+     * 注意：此方法调用频繁，避免产生内存碎片
+     *
+     * @param model
+     * @return
+     */
+    public static int getItemCount(ResultModel model) {
+        //如果实现Countable接口，则认为model自己统计元素数量
+        if (model instanceof Countable) {
+            return ((Countable) model).size();
+        }
+
+        //对于普通的Model，通过类反射统计容器类字段统计元素数量
+        //缓存Field对象，避免产生内存碎片
+        Class modelClass = model.getClass();
+        List<Field> fields = modelFieldMap.get(modelClass.getName());
+        if (fields == null) {
+            fields = new ArrayList<Field>();
+            Field[] declaredFields = modelClass.getDeclaredFields();
+            for (int i = 0; i < declaredFields.length; i++) {
+                Field field = declaredFields[i];
+                Class<?> fieldClass = field.getType();
+                //如果是List/Map/Array/Countable类型的字段，则缓存起来后面统计数量
+                if (Collection.class.isAssignableFrom(fieldClass)
+                        || Map.class.isAssignableFrom(fieldClass)
+                        || Countable.class.isAssignableFrom(fieldClass)
+                        || fieldClass.isArray()) {
+                    field.setAccessible(true);
+                    fields.add(field);
+                }
+            }
+            List<Field> old_fields = modelFieldMap.putIfAbsent(modelClass.getName(), fields);
+            if (old_fields != null) {
+                fields = old_fields;
+            }
+        }
+
+        //统计Model对象的item数量
+        int count = 0;
+        try {
+            for (int i = 0; i < fields.size(); i++) {
+                Field field = fields.get(i);
+                if (!field.isAccessible()) {
+                    field.setAccessible(true);
+                }
+                Object value = field.get(model);
+                if (value != null) {
+                    if (value instanceof Collection) {
+                        count += ((Collection) value).size();
+                    } else if (value.getClass().isArray()) {
+                        count += Array.getLength(value);
+                    } else if (value instanceof Map) {
+                        count += ((Map) value).size();
+                    } else if (value instanceof Countable) {
+                        count += ((Countable) value).size();
+                    }
+                }
+            }
+        } catch (Exception e) {
+            logger.error("get item count of result model failed, model: {}", JSON.toJSONString(model), e);
+        }
+
+        return count > 0 ? count : 1;
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/ResultDistributor.java b/core/src/main/java/com/taobao/arthas/core/distribution/ResultDistributor.java
new file mode 100644
index 000000000..5b6711bf7
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/ResultDistributor.java
@@ -0,0 +1,21 @@
+package com.taobao.arthas.core.distribution;
+
+import com.taobao.arthas.core.command.model.ResultModel;
+
+/**
+ * Command result distributor, sending results to consumers who joins in the same session.
+ * @author gongdewei 2020-03-26
+ */
+public interface ResultDistributor {
+
+    /**
+     * Append the phased result to queue
+     * @param result a phased result of the command
+     */
+    void appendResult(ResultModel result);
+
+    /**
+     * Close result distribtor, release resources
+     */
+    void close();
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/SharingResultDistributor.java b/core/src/main/java/com/taobao/arthas/core/distribution/SharingResultDistributor.java
new file mode 100644
index 000000000..2e7228fe1
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/SharingResultDistributor.java
@@ -0,0 +1,31 @@
+package com.taobao.arthas.core.distribution;
+
+import java.util.List;
+
+public interface SharingResultDistributor extends ResultDistributor {
+
+    /**
+     * Add consumer to sharing session
+     * @param consumer
+     */
+    void addConsumer(ResultConsumer consumer);
+
+    /**
+     * Remove consumer from sharing session
+     * @param consumer
+     */
+    void removeConsumer(ResultConsumer consumer);
+
+    /**
+     * Get all consumers of session
+     * @return
+     */
+    List<ResultConsumer> getConsumers();
+
+    /**
+     * Get consumer by id
+     * @param consumerId
+     * @return
+     */
+    ResultConsumer getConsumer(String consumerId);
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/impl/CompositeResultDistributorImpl.java b/core/src/main/java/com/taobao/arthas/core/distribution/impl/CompositeResultDistributorImpl.java
new file mode 100644
index 000000000..eb254622a
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/impl/CompositeResultDistributorImpl.java
@@ -0,0 +1,52 @@
+package com.taobao.arthas.core.distribution.impl;
+
+import com.taobao.arthas.core.command.model.ResultModel;
+import com.taobao.arthas.core.distribution.CompositeResultDistributor;
+import com.taobao.arthas.core.distribution.ResultDistributor;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * 复合结果分发器，将消息同时分发给其包含的真实分发器
+ *
+ * @author gongdewei 2020/4/30
+ */
+public class CompositeResultDistributorImpl implements CompositeResultDistributor {
+
+    private List<ResultDistributor> distributors = Collections.synchronizedList(new ArrayList<ResultDistributor>());
+
+    public CompositeResultDistributorImpl() {
+    }
+
+    public CompositeResultDistributorImpl(ResultDistributor ... distributors) {
+        for (ResultDistributor distributor : distributors) {
+            this.addDistributor(distributor);
+        }
+    }
+
+    @Override
+    public void addDistributor(ResultDistributor distributor) {
+        distributors.add(distributor);
+    }
+
+    @Override
+    public void removeDistributor(ResultDistributor distributor) {
+        distributors.remove(distributor);
+    }
+
+    @Override
+    public void appendResult(ResultModel result) {
+        for (ResultDistributor distributor : distributors) {
+            distributor.appendResult(result);
+        }
+    }
+
+    @Override
+    public void close() {
+        for (ResultDistributor distributor : distributors) {
+            distributor.close();
+        }
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/impl/PackingResultDistributorImpl.java b/core/src/main/java/com/taobao/arthas/core/distribution/impl/PackingResultDistributorImpl.java
new file mode 100644
index 000000000..9903b8e48
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/impl/PackingResultDistributorImpl.java
@@ -0,0 +1,43 @@
+package com.taobao.arthas.core.distribution.impl;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.alibaba.fastjson.JSON;
+import com.taobao.arthas.core.command.model.ResultModel;
+import com.taobao.arthas.core.distribution.PackingResultDistributor;
+import com.taobao.arthas.core.shell.session.Session;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+
+public class PackingResultDistributorImpl implements PackingResultDistributor {
+    private static final Logger logger = LoggerFactory.getLogger(PackingResultDistributorImpl.class);
+
+    private BlockingQueue<ResultModel> resultQueue = new ArrayBlockingQueue<ResultModel>(500);
+    private final Session session;
+
+    public PackingResultDistributorImpl(Session session) {
+        this.session = session;
+    }
+
+    @Override
+    public void appendResult(ResultModel result) {
+        if (!resultQueue.offer(result)) {
+            logger.warn("result queue is full: {}, discard later result: {}", resultQueue.size(), JSON.toJSONString(result));
+        }
+    }
+
+    @Override
+    public void close() {
+    }
+
+    @Override
+    public List<ResultModel> getResults() {
+        ArrayList<ResultModel> results = new ArrayList<ResultModel>(resultQueue.size());
+        resultQueue.drainTo(results);
+        return results;
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/impl/ResultConsumerImpl.java b/core/src/main/java/com/taobao/arthas/core/distribution/impl/ResultConsumerImpl.java
new file mode 100644
index 000000000..d3f3a9eab
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/impl/ResultConsumerImpl.java
@@ -0,0 +1,167 @@
+package com.taobao.arthas.core.distribution.impl;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.alibaba.fastjson.JSON;
+import com.taobao.arthas.core.command.model.ResultModel;
+import com.taobao.arthas.core.distribution.DistributorOptions;
+import com.taobao.arthas.core.distribution.ResultConsumer;
+import com.taobao.arthas.core.distribution.ResultConsumerHelper;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ * @author gongdewei 2020/3/27
+ */
+public class ResultConsumerImpl implements ResultConsumer {
+    private static final Logger logger = LoggerFactory.getLogger(ResultConsumerImpl.class);
+    private BlockingQueue<ResultModel> resultQueue;
+    private volatile long lastAccessTime;
+    private volatile boolean polling;
+    private ReentrantLock lock = new ReentrantLock();
+    private int resultBatchSizeLimit = 20;
+    private int resultQueueSize = DistributorOptions.resultQueueSize;
+    private long pollTimeLimit = 2 * 1000;
+    private String consumerId;
+    private boolean closed;
+    private long sendingItemCount;
+
+    public ResultConsumerImpl() {
+        lastAccessTime = System.currentTimeMillis();
+        resultQueue = new ArrayBlockingQueue<ResultModel>(resultQueueSize);
+    }
+
+    @Override
+    public boolean appendResult(ResultModel result) {
+        //可能某些Consumer已经断开，不会再读取，这里不能堵塞！
+        boolean discard = false;
+        while (!resultQueue.offer(result)) {
+            ResultModel discardResult = resultQueue.poll();
+            discard = true;
+        }
+        return !discard;
+    }
+
+    @Override
+    public List<ResultModel> pollResults() {
+        try {
+            lastAccessTime = System.currentTimeMillis();
+            long accessTime = lastAccessTime;
+            if (lock.tryLock(500, TimeUnit.MILLISECONDS)) {
+                polling = true;
+                sendingItemCount = 0;
+                long firstResultTime = 0;
+                // sending delay: time elapsed after firstResultTime
+                long sendingDelay = 0;
+                // waiting time: time elapsed after access
+                long waitingTime = 0;
+                List<ResultModel> sendingResults = new ArrayList<ResultModel>(resultBatchSizeLimit);
+
+                while (!closed
+                        &&sendingResults.size() < resultBatchSizeLimit
+                        && sendingDelay < 100
+                        && waitingTime < pollTimeLimit) {
+                    ResultModel aResult = resultQueue.poll(100, TimeUnit.MILLISECONDS);
+                    if (aResult != null) {
+                        sendingResults.add(aResult);
+                        //是否为第一次获取到数据
+                        if (firstResultTime == 0) {
+                            firstResultTime = System.currentTimeMillis();
+                        }
+                        //判断是否需要立即发送出去
+                        if (shouldFlush(sendingResults, aResult)) {
+                            break;
+                        }
+                    } else {
+                        if (firstResultTime > 0) {
+                            //获取到部分数据后，队列已经取完，计算发送延时时间
+                            sendingDelay = System.currentTimeMillis() - firstResultTime;
+                        }
+                        //计算总共等待时间，长轮询最大等待时间
+                        waitingTime = System.currentTimeMillis() - accessTime;
+                    }
+                }
+
+                //resultQueue.drainTo(sendingResults, resultSizeLimit-sendingResults.size());
+                if(logger.isDebugEnabled()) {
+                    logger.debug("pollResults: {}, results: {}", sendingResults.size(), JSON.toJSONString(sendingResults));
+                }
+                return sendingResults;
+            }
+        } catch (InterruptedException e) {
+            //e.printStackTrace();
+        } finally {
+            if (lock.isHeldByCurrentThread()) {
+                lastAccessTime = System.currentTimeMillis();
+                polling = false;
+                lock.unlock();
+            }
+        }
+        return Collections.emptyList();
+    }
+
+    /**
+     * 估算对象数量及大小，判断是否需要立即发送出去
+     * @param sendingResults
+     * @param last
+     * @return
+     */
+    private boolean shouldFlush(List<ResultModel> sendingResults, ResultModel last) {
+        //TODO 引入一个估算模型，每个model自统计对象数量
+        sendingItemCount += ResultConsumerHelper.getItemCount(last);
+        return sendingItemCount >= 100;
+    }
+
+    @Override
+    public boolean isHealthy() {
+
+        return isPolling()
+                || resultQueue.size() < resultQueueSize
+                || System.currentTimeMillis() - lastAccessTime < 1000;
+    }
+
+    @Override
+    public long getLastAccessTime() {
+        return lastAccessTime;
+    }
+
+    @Override
+    public void close(){
+        this.closed = true;
+    }
+
+    @Override
+    public boolean isClosed() {
+        return closed;
+    }
+
+    @Override
+    public boolean isPolling() {
+        return polling;
+    }
+
+    public int getResultBatchSizeLimit() {
+        return resultBatchSizeLimit;
+    }
+
+    public void setResultBatchSizeLimit(int resultBatchSizeLimit) {
+        this.resultBatchSizeLimit = resultBatchSizeLimit;
+    }
+
+    @Override
+    public String getConsumerId() {
+        return consumerId;
+    }
+
+    @Override
+    public void setConsumerId(String consumerId) {
+        this.consumerId = consumerId;
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/impl/SharingResultDistributorImpl.java b/core/src/main/java/com/taobao/arthas/core/distribution/impl/SharingResultDistributorImpl.java
new file mode 100644
index 000000000..3ecd4ca2a
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/impl/SharingResultDistributorImpl.java
@@ -0,0 +1,220 @@
+package com.taobao.arthas.core.distribution.impl;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.core.command.model.InputStatusModel;
+import com.taobao.arthas.core.command.model.MessageModel;
+import com.taobao.arthas.core.command.model.ResultModel;
+import com.taobao.arthas.core.distribution.DistributorOptions;
+import com.taobao.arthas.core.distribution.ResultConsumer;
+import com.taobao.arthas.core.distribution.SharingResultDistributor;
+import com.taobao.arthas.core.shell.session.Session;
+import com.taobao.arthas.core.shell.system.Job;
+
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class SharingResultDistributorImpl implements SharingResultDistributor {
+    private static final Logger logger = LoggerFactory.getLogger(SharingResultDistributorImpl.class);
+
+    private List<ResultConsumer> consumers = new CopyOnWriteArrayList<ResultConsumer>();
+    private BlockingQueue<ResultModel> pendingResultQueue = new ArrayBlockingQueue<ResultModel>(10);
+    private final Session session;
+    private Thread distributorThread;
+    private volatile boolean running;
+    private AtomicInteger consumerNumGenerator = new AtomicInteger(0);
+
+    private SharingResultConsumerImpl sharingResultConsumer = new SharingResultConsumerImpl();
+
+    public SharingResultDistributorImpl(Session session) {
+        this.session = session;
+        this.running = true;
+        distributorThread = new Thread(new DistributorTask(), "ResultDistributor");
+        distributorThread.start();
+    }
+
+    @Override
+    public void appendResult(ResultModel result) {
+        //要避免阻塞影响业务线程执行
+        try {
+            if (!pendingResultQueue.offer(result, 100, TimeUnit.MILLISECONDS)) {
+                ResultModel discardResult = pendingResultQueue.poll();
+                // 正常情况走不到这里，除非distribute 循环堵塞或异常终止
+                // 输出队列满，终止当前执行的命令
+                interruptJob("result queue is full: "+ pendingResultQueue.size());
+            }
+        } catch (InterruptedException e) {
+            //ignore
+        }
+    }
+
+    private void interruptJob(String message) {
+        Job job = session.getForegroundJob();
+        if (job != null) {
+            logger.warn(message+", current job was interrupted.", job.id());
+            job.interrupt();
+            pendingResultQueue.offer(new MessageModel(message+", current job was interrupted."));
+        }
+    }
+
+    private void distribute() {
+        while (running) {
+            try {
+                ResultModel result = pendingResultQueue.poll(100, TimeUnit.MILLISECONDS);
+                if (result != null) {
+                    sharingResultConsumer.appendResult(result);
+                    //判断是否有至少一个consumer是健康的
+                    int healthCount = 0;
+                    for (int i = 0; i < consumers.size(); i++) {
+                        ResultConsumer consumer = consumers.get(i);
+                        if(consumer.isHealthy()){
+                            healthCount += 1;
+                        }
+                        consumer.appendResult(result);
+                    }
+                    //所有consumer都不是健康状态，终止当前执行的命令
+                    if (healthCount == 0) {
+                        interruptJob("all consumers are unhealthy");
+                    }
+                }
+            } catch (Throwable e) {
+                logger.warn("distribute result failed: " + e.getMessage(), e);
+            }
+        }
+    }
+
+    @Override
+    public void close() {
+        this.running = false;
+    }
+
+    @Override
+    public void addConsumer(ResultConsumer consumer) {
+        int consumerNo = consumerNumGenerator.incrementAndGet();
+        String consumerId = UUID.randomUUID().toString().replaceAll("-", "") + "_" + consumerNo;
+        consumer.setConsumerId(consumerId);
+
+        //将队列中的消息复制给新的消费者
+        sharingResultConsumer.copyTo(consumer);
+
+        consumers.add(consumer);
+    }
+
+    @Override
+    public void removeConsumer(ResultConsumer consumer) {
+        consumers.remove(consumer);
+        consumer.close();
+    }
+
+    @Override
+    public List<ResultConsumer> getConsumers() {
+        return consumers;
+    }
+
+    @Override
+    public ResultConsumer getConsumer(String consumerId) {
+        for (int i = 0; i < consumers.size(); i++) {
+            ResultConsumer consumer = consumers.get(i);
+            if (consumer.getConsumerId().equals(consumerId)) {
+                return consumer;
+            }
+        }
+        return null;
+    }
+
+    private class DistributorTask implements Runnable {
+        @Override
+        public void run() {
+            distribute();
+        }
+    }
+
+    private class SharingResultConsumerImpl implements ResultConsumer {
+        private BlockingQueue<ResultModel> resultQueue = new ArrayBlockingQueue<ResultModel>(DistributorOptions.resultQueueSize);
+        private ReentrantLock queueLock = new ReentrantLock();
+        private InputStatusModel lastInputStatus;
+
+        @Override
+        public boolean appendResult(ResultModel result) {
+            queueLock.lock();
+            try {
+                //输入状态不入历史指令队列，复制时在最后发送
+                if (result instanceof InputStatusModel) {
+                    lastInputStatus = (InputStatusModel) result;
+                    return true;
+                }
+                while (!resultQueue.offer(result)) {
+                    ResultModel discardResult = resultQueue.poll();
+                }
+            } finally {
+                if (queueLock.isHeldByCurrentThread()) {
+                    queueLock.unlock();
+                }
+            }
+            return true;
+        }
+
+        public void copyTo(ResultConsumer consumer) {
+            //复制时加锁，避免消息顺序错乱，这里堵塞只影响分发线程，不会影响到业务线程
+            queueLock.lock();
+            try {
+                for (ResultModel result : resultQueue) {
+                    consumer.appendResult(result);
+                }
+                //发送输入状态
+                if (lastInputStatus != null) {
+                    consumer.appendResult(lastInputStatus);
+                }
+            } finally {
+                if (queueLock.isHeldByCurrentThread()) {
+                    queueLock.unlock();
+                }
+            }
+        }
+
+        @Override
+        public List<ResultModel> pollResults() {
+            return null;
+        }
+
+        @Override
+        public long getLastAccessTime() {
+            return 0;
+        }
+
+        @Override
+        public void close() {
+
+        }
+
+        @Override
+        public boolean isClosed() {
+            return false;
+        }
+
+        @Override
+        public boolean isPolling() {
+            return false;
+        }
+
+        @Override
+        public String getConsumerId() {
+            return "shared-consumer";
+        }
+
+        @Override
+        public void setConsumerId(String consumerId) {
+        }
+
+        @Override
+        public boolean isHealthy() {
+            return true;
+        }
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/distribution/impl/TermResultDistributorImpl.java b/core/src/main/java/com/taobao/arthas/core/distribution/impl/TermResultDistributorImpl.java
new file mode 100644
index 000000000..cc460a4fe
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/distribution/impl/TermResultDistributorImpl.java
@@ -0,0 +1,36 @@
+package com.taobao.arthas.core.distribution.impl;
+
+import com.taobao.arthas.core.command.model.ResultModel;
+import com.taobao.arthas.core.command.view.ResultView;
+import com.taobao.arthas.core.command.view.ResultViewResolver;
+import com.taobao.arthas.core.distribution.ResultDistributor;
+import com.taobao.arthas.core.shell.command.CommandProcess;
+
+/**
+ * Term/Tty Result Distributor
+ *
+ * @author gongdewei 2020-03-26
+ */
+public class TermResultDistributorImpl implements ResultDistributor {
+
+    private final CommandProcess commandProcess;
+    private final ResultViewResolver resultViewResolver;
+
+    public TermResultDistributorImpl(CommandProcess commandProcess) {
+        this.commandProcess = commandProcess;
+        this.resultViewResolver = ResultViewResolver.getInstance();
+    }
+
+    @Override
+    public void appendResult(ResultModel model) {
+        ResultView resultView = resultViewResolver.getResultView(model);
+        if (resultView != null) {
+            resultView.draw(commandProcess, model);
+        }
+    }
+
+    @Override
+    public void close() {
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/server/ArthasBootstrap.java b/core/src/main/java/com/taobao/arthas/core/server/ArthasBootstrap.java
index 8d5c20343..8f575d8d7 100644
--- a/core/src/main/java/com/taobao/arthas/core/server/ArthasBootstrap.java
+++ b/core/src/main/java/com/taobao/arthas/core/server/ArthasBootstrap.java
@@ -40,26 +40,30 @@ import com.taobao.arthas.core.shell.ShellServerOptions;
 import com.taobao.arthas.core.shell.command.CommandResolver;
 import com.taobao.arthas.core.shell.handlers.BindHandler;
 import com.taobao.arthas.core.shell.impl.ShellServerImpl;
+import com.taobao.arthas.core.shell.session.SessionManager;
+import com.taobao.arthas.core.shell.session.impl.SessionManagerImpl;
 import com.taobao.arthas.core.shell.term.impl.HttpTermServer;
 import com.taobao.arthas.core.shell.term.impl.httptelnet.HttpTelnetTermServer;
 import com.taobao.arthas.core.util.ArthasBanner;
 import com.taobao.arthas.core.util.FileUtils;
 import com.taobao.arthas.core.util.LogUtil;
 import com.taobao.arthas.core.util.UserStatUtil;
-
 import io.netty.channel.ChannelFuture;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.util.concurrent.EventExecutorGroup;
 
 
 /**
  * @author vlinux on 15/5/2.
+ * @author gongdewei 2020-03-25
  */
 public class ArthasBootstrap {
     public static final String ARTHAS_HOME_PROPERTY = "arthas.home";
     private static String ARTHAS_SHOME = null;
 
-    public static final String CONFIG_NAME_PROPERTY  = "arthas.config.name";
+    public static final String CONFIG_NAME_PROPERTY = "arthas.config.name";
     public static final String CONFIG_LOCATION_PROPERTY = "arthas.config.location";
-    public static final String CONFIG_OVERRIDE_ALL= "arthas.config.overrideAll";
+    public static final String CONFIG_OVERRIDE_ALL = "arthas.config.overrideAll";
 
     private static ArthasBootstrap arthasBootstrap;
 
@@ -71,11 +75,13 @@ public class ArthasBootstrap {
     private Thread shutdown;
     private ShellServer shellServer;
     private ScheduledExecutorService executorService;
+    private SessionManager sessionManager;
     private TunnelClient tunnelClient;
 
     private File arthasOutputDir;
 
     private static LoggerContext loggerContext;
+    private EventExecutorGroup workerGroup;
 
     private Timer timer = new Timer("arthas-timer", true);
 
@@ -262,20 +268,25 @@ public class ArthasBootstrap {
                 welcomeInfos.put("id", agentId);
                 options.setWelcomeMessage(ArthasBanner.welcome(welcomeInfos));
             }
+
             shellServer = new ShellServerImpl(options, this);
             BuiltinCommandPack builtinCommands = new BuiltinCommandPack();
             List<CommandResolver> resolvers = new ArrayList<CommandResolver>();
             resolvers.add(builtinCommands);
+
+            //worker group
+            workerGroup = new NioEventLoopGroup(8);
+
             // TODO: discover user provided command resolver
             if (configure.getTelnetPort() > 0) {
                 shellServer.registerTermServer(new HttpTelnetTermServer(configure.getIp(), configure.getTelnetPort(),
-                                options.getConnectionTimeout()));
+                        options.getConnectionTimeout(), workerGroup));
             } else {
                 logger().info("telnet port is {}, skip bind telnet server.", configure.getTelnetPort());
             }
             if (configure.getHttpPort() > 0) {
                 shellServer.registerTermServer(new HttpTermServer(configure.getIp(), configure.getHttpPort(),
-                                options.getConnectionTimeout()));
+                        options.getConnectionTimeout(), workerGroup));
             } else {
                 logger().info("http port is {}, skip bind http server.", configure.getHttpPort());
             }
@@ -286,8 +297,12 @@ public class ArthasBootstrap {
 
             shellServer.listen(new BindHandler(isBindRef));
 
+            //http api session manager
+            sessionManager = new SessionManagerImpl(options, this, shellServer.getCommandManager(), shellServer.getJobController());
+
             logger().info("as-server listening on network={};telnet={};http={};timeout={};", configure.getIp(),
                     configure.getTelnetPort(), configure.getHttpPort(), options.getConnectionTimeout());
+
             // 异步回报启动次数
             if (configure.getStatUrl() != null) {
                 logger().info("arthas stat url: {}", configure.getStatUrl());
@@ -295,16 +310,27 @@ public class ArthasBootstrap {
             UserStatUtil.setStatUrl(configure.getStatUrl());
             UserStatUtil.arthasStart();
 
-            logger().info("as-server started in {} ms", System.currentTimeMillis() - start );
+            logger().info("as-server started in {} ms", System.currentTimeMillis() - start);
         } catch (Throwable e) {
             logger().error("Error during bind to port " + configure.getTelnetPort(), e);
             if (shellServer != null) {
                 shellServer.close();
             }
+            if (sessionManager != null){
+                sessionManager.close();
+            }
+            shutdownWorkGroup();
             throw e;
         }
     }
 
+    private void shutdownWorkGroup() {
+        if (workerGroup != null) {
+            workerGroup.shutdownGracefully(200, 200, TimeUnit.MILLISECONDS);
+            workerGroup = null;
+        }
+    }
+
     /**
      * 判断服务端是否已经启动
      *
@@ -320,12 +346,13 @@ public class ArthasBootstrap {
             try {
                 tunnelClient.stop();
             } catch (Throwable e) {
-                logger().error("arthas", "stop tunnel client error", e);
+                logger().error("stop tunnel client error", e);
             }
         }
         executorService.shutdownNow();
         transformerManager.destroy();
         UserStatUtil.destroy();
+        shutdownWorkGroup();
         // clear the reference in Spy class.
         cleanUpSpyReference();
         try {
@@ -337,6 +364,8 @@ public class ArthasBootstrap {
         if (loggerContext != null) {
             loggerContext.stop();
         }
+        shellServer = null;
+        sessionManager = null;
     }
 
     /**
@@ -352,6 +381,7 @@ public class ArthasBootstrap {
         }
         return arthasBootstrap;
     }
+
     /**
      * @return ArthasServer单例
      */
@@ -385,6 +415,14 @@ public class ArthasBootstrap {
         return tunnelClient;
     }
 
+    public ShellServer getShellServer() {
+        return shellServer;
+    }
+
+    public SessionManager getSessionManager() {
+        return sessionManager;
+    }
+
     public Timer getTimer() {
         return this.timer;
     }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/ShellServer.java b/core/src/main/java/com/taobao/arthas/core/shell/ShellServer.java
index 49192c84b..b69ae4255 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/ShellServer.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/ShellServer.java
@@ -5,6 +5,8 @@ import com.taobao.arthas.core.shell.future.Future;
 import com.taobao.arthas.core.shell.handlers.Handler;
 import com.taobao.arthas.core.shell.handlers.NoOpHandler;
 import com.taobao.arthas.core.shell.impl.ShellServerImpl;
+import com.taobao.arthas.core.shell.system.impl.InternalCommandManager;
+import com.taobao.arthas.core.shell.system.impl.JobControllerImpl;
 import com.taobao.arthas.core.shell.term.Term;
 import com.taobao.arthas.core.shell.term.TermServer;
 
@@ -102,4 +104,14 @@ public abstract class ShellServer {
      * @param completionHandler handler for getting notified when service is stopped
      */
     public abstract void close(Handler<Future<Void>> completionHandler);
+
+    /**
+     * @return global job controller instance
+     */
+    public abstract JobControllerImpl getJobController();
+
+    /**
+     * @return get command manager instance
+     */
+    public abstract InternalCommandManager getCommandManager();
 }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/command/CommandProcess.java b/core/src/main/java/com/taobao/arthas/core/shell/command/CommandProcess.java
index 0c2694ff8..3cdf16af3 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/command/CommandProcess.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/command/CommandProcess.java
@@ -1,6 +1,7 @@
 package com.taobao.arthas.core.shell.command;
 
 import com.taobao.arthas.core.advisor.AdviceListener;
+import com.taobao.arthas.core.command.model.ResultModel;
 import com.taobao.arthas.core.shell.cli.CliToken;
 import com.taobao.arthas.core.shell.handlers.Handler;
 import com.taobao.arthas.core.shell.session.Session;
@@ -119,6 +120,13 @@ public interface CommandProcess extends Tty {
      */
     void end(int status);
 
+    /**
+     * End the process.
+     *
+     * @param status the exit status.
+     */
+    void end(int status, String message);
+
 
     /**
      * Register listener
@@ -167,4 +175,11 @@ public interface CommandProcess extends Tty {
      * Whether the process is running
      */
     boolean isRunning();
+
+    /**
+     * Append the phased result to queue
+     * @param result a phased result of the command
+     */
+    void appendResult(ResultModel result);
+
 }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/history/HistoryManager.java b/core/src/main/java/com/taobao/arthas/core/shell/history/HistoryManager.java
new file mode 100644
index 000000000..6b01c5c79
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/history/HistoryManager.java
@@ -0,0 +1,21 @@
+package com.taobao.arthas.core.shell.history;
+
+import java.util.List;
+
+/**
+ * @author gongdewei 2020/4/8
+ */
+public interface HistoryManager {
+
+    void addHistory(String commandLine);
+
+    List<String> getHistory();
+
+    void setHistory(List<String> history);
+
+    void saveHistory();
+
+    void loadHistory();
+
+    void clearHistory();
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/history/impl/HistoryManagerImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/history/impl/HistoryManagerImpl.java
new file mode 100644
index 000000000..26f6dabd1
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/history/impl/HistoryManagerImpl.java
@@ -0,0 +1,70 @@
+package com.taobao.arthas.core.shell.history.impl;
+
+import com.taobao.arthas.core.shell.history.HistoryManager;
+import com.taobao.arthas.core.util.Constants;
+import com.taobao.arthas.core.util.FileUtils;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author gongdewei 2020/4/8
+ */
+public class HistoryManagerImpl implements HistoryManager {
+    /**
+     * The max number of history item that will be saved in memory.
+     */
+    private static final int MAX_HISTORY_SIZE = 500;
+
+    private List<String> history = new ArrayList<String>();
+
+    private static HistoryManager instance;
+
+    public static HistoryManager getInstance() {
+        if (instance == null) {
+            synchronized (HistoryManagerImpl.class) {
+                instance = new HistoryManagerImpl();
+            }
+        }
+        return instance;
+    }
+
+    private HistoryManagerImpl() {
+    }
+
+    @Override
+    public void saveHistory() {
+        FileUtils.saveCommandHistoryString(history, new File(Constants.CMD_HISTORY_FILE));
+    }
+
+    @Override
+    public void loadHistory() {
+        history = FileUtils.loadCommandHistoryString(new File(Constants.CMD_HISTORY_FILE));
+    }
+
+    @Override
+    public void clearHistory() {
+        this.history.clear();
+    }
+
+    @Override
+    public void addHistory(String commandLine) {
+        while (history.size() >= MAX_HISTORY_SIZE) {
+            history.remove(0);
+        }
+        history.add(commandLine);
+    }
+
+    @Override
+    public List<String> getHistory() {
+        return history;
+    }
+
+    @Override
+    public void setHistory(List<String> history) {
+        this.history = history;
+    }
+
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/impl/ShellImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/impl/ShellImpl.java
index cdd8bad73..a9e3ac54b 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/impl/ShellImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/impl/ShellImpl.java
@@ -7,22 +7,21 @@ import com.taobao.arthas.core.shell.ShellServer;
 import com.taobao.arthas.core.shell.cli.CliToken;
 import com.taobao.arthas.core.shell.cli.CliTokens;
 import com.taobao.arthas.core.shell.future.Future;
-import com.taobao.arthas.core.shell.handlers.shell.CloseHandler;
-import com.taobao.arthas.core.shell.handlers.shell.CommandManagerCompletionHandler;
-import com.taobao.arthas.core.shell.handlers.shell.FutureHandler;
-import com.taobao.arthas.core.shell.handlers.shell.InterruptHandler;
-import com.taobao.arthas.core.shell.handlers.shell.ShellLineHandler;
-import com.taobao.arthas.core.shell.handlers.shell.SuspendHandler;
+import com.taobao.arthas.core.shell.handlers.shell.*;
 import com.taobao.arthas.core.shell.session.Session;
 import com.taobao.arthas.core.shell.session.impl.SessionImpl;
 import com.taobao.arthas.core.shell.system.ExecStatus;
 import com.taobao.arthas.core.shell.system.Job;
 import com.taobao.arthas.core.shell.system.JobController;
+import com.taobao.arthas.core.shell.system.JobListener;
 import com.taobao.arthas.core.shell.system.impl.InternalCommandManager;
 import com.taobao.arthas.core.shell.system.impl.JobControllerImpl;
 import com.taobao.arthas.core.shell.term.Term;
-import com.taobao.arthas.core.shell.term.impl.httptelnet.HttpTelnetTermServer;
+import com.taobao.arthas.core.shell.term.impl.TermImpl;
+import com.taobao.arthas.core.util.Constants;
+import com.taobao.arthas.core.util.FileUtils;
 
+import java.io.File;
 import java.lang.instrument.Instrumentation;
 import java.util.Date;
 import java.util.List;
@@ -79,7 +78,7 @@ public class ShellImpl implements Shell {
 
     @Override
     public synchronized Job createJob(List<CliToken> args) {
-        Job job = jobController.createJob(commandManager, args, this);
+        Job job = jobController.createJob(commandManager, args, session, new ShellJobHandler(this), term, null);
         return job;
     }
 
@@ -165,7 +164,7 @@ public class ShellImpl implements Shell {
                 // sometimes an NPE will be thrown during shutdown via web-socket,
                 // this ensures the shutdown process is finished properly
                 // https://github.com/alibaba/arthas/issues/320
-                logger.error("ARTHAS", "Error writing data:", t);
+                logger.error("Error writing data:", t);
             }
             term.close();
         } else {
@@ -180,4 +179,53 @@ public class ShellImpl implements Shell {
     public Job getForegroundJob() {
         return currentForegroundJob;
     }
+
+    private class ShellJobHandler implements JobListener {
+        ShellImpl shell;
+
+        public ShellJobHandler(ShellImpl shell) {
+            this.shell = shell;
+        }
+
+        @Override
+        public void onForeground(Job job) {
+            shell.setForegroundJob(job);
+            //reset stdin handler to job's origin handler
+            //shell.term().stdinHandler(job.process().getStdinHandler());
+        }
+
+        @Override
+        public void onBackground(Job job) {
+            resetAndReadLine();
+        }
+
+        @Override
+        public void onTerminated(Job job) {
+            if (!job.isRunInBackground()){
+                resetAndReadLine();
+            }
+
+            // save command history
+            Term term = shell.term();
+            if (term instanceof TermImpl) {
+                List<int[]> history = ((TermImpl) term).getReadline().getHistory();
+                FileUtils.saveCommandHistory(history, new File(Constants.CMD_HISTORY_FILE));
+            }
+        }
+
+        @Override
+        public void onSuspend(Job job) {
+            if (!job.isRunInBackground()){
+                resetAndReadLine();
+            }
+        }
+
+        private void resetAndReadLine() {
+            //reset stdin handler to echo handler
+            //shell.term().stdinHandler(null);
+            shell.setForegroundJob(null);
+            shell.readline();
+        }
+    }
+
 }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/impl/ShellServerImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/impl/ShellServerImpl.java
index 802171fb4..0d649c919 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/impl/ShellServerImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/impl/ShellServerImpl.java
@@ -242,4 +242,12 @@ public class ShellServerImpl extends ShellServer {
             bootstrap.destroy();
         }
     }
+
+    public JobControllerImpl getJobController() {
+        return jobController;
+    }
+
+    public InternalCommandManager getCommandManager() {
+        return commandManager;
+    }
 }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/session/Session.java b/core/src/main/java/com/taobao/arthas/core/shell/session/Session.java
index 5242a684e..8ca1c902e 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/session/Session.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/session/Session.java
@@ -1,7 +1,8 @@
 package com.taobao.arthas.core.shell.session;
 
-import com.taobao.arthas.core.shell.ShellServer;
+import com.taobao.arthas.core.distribution.SharingResultDistributor;
 import com.taobao.arthas.core.shell.command.CommandResolver;
+import com.taobao.arthas.core.shell.system.Job;
 
 import java.lang.instrument.Instrumentation;
 import java.util.List;
@@ -10,6 +11,7 @@ import java.util.List;
  * A shell session.
  *
  * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
+ * @author gongdewei 2020-03-23
  */
 public interface Session {
     String COMMAND_MANAGER = "arthas-command-manager";
@@ -22,6 +24,27 @@ public interface Session {
      */
     String TTY = "tty";
 
+    /**
+     * Session create time
+     */
+    String CREATE_TIME = "createTime";
+
+    /**
+     * Session last active time
+     */
+    String LAST_ACCESS_TIME = "lastAccessedTime";
+
+    /**
+     * Command Result Distributor
+     */
+    String RESULT_DISTRIBUTOR = "resultDistributor";
+
+    /**
+     * The executing foreground job
+     */
+    String FOREGROUND_JOB = "foregroundJob";
+
+
     /**
      * Put some data in a session
      *
@@ -80,13 +103,6 @@ public interface Session {
      */
     String getSessionId();
 
-    /**
-     * Get shell server
-     *
-     * @return shell server
-     */
-    ShellServer getServer();
-
     /**
      * Get Java PID
      *
@@ -107,4 +123,49 @@ public interface Session {
      * @return instrumentation instance
      */
     Instrumentation getInstrumentation();
+
+    /**
+     * Update session last access time
+     * @param time new time
+     */
+    void setLastAccessTime(long time);
+
+    /**
+     * Get session last access time
+     * @return session last access time
+     */
+    long getLastAccessTime();
+
+    /**
+     * Get session create time
+     * @return session create time
+     */
+    long getCreateTime();
+
+    /**
+     * Update session's command result distributor
+     * @param resultDistributor
+     */
+    void setResultDistributor(SharingResultDistributor resultDistributor);
+
+    /**
+     * Get session's command result distributor
+     * @return
+     */
+    SharingResultDistributor getResultDistributor();
+
+    /**
+     * Set the foreground job
+     */
+    void setForegroundJob(Job job);
+
+    /**
+     * Get the foreground job
+     */
+    Job getForegroundJob();
+
+    /**
+     * Whether the session is tty term
+     */
+    boolean isTty();
 }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/session/SessionManager.java b/core/src/main/java/com/taobao/arthas/core/shell/session/SessionManager.java
new file mode 100644
index 000000000..d891d258f
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/session/SessionManager.java
@@ -0,0 +1,29 @@
+package com.taobao.arthas.core.shell.session;
+
+import com.taobao.arthas.core.shell.system.JobController;
+import com.taobao.arthas.core.shell.system.impl.InternalCommandManager;
+
+import java.lang.instrument.Instrumentation;
+
+/**
+ * Arthas Session Manager
+ * @author gongdewei 2020-03-20
+ */
+public interface SessionManager {
+
+    Session createSession();
+
+    Session getSession(String sessionId);
+
+    Session removeSession(String sessionId);
+
+    void updateAccessTime(Session session);
+
+    void close();
+
+    InternalCommandManager getCommandManager();
+
+    Instrumentation getInstrumentation();
+
+    JobController getJobController();
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/session/impl/SessionImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/session/impl/SessionImpl.java
index a0a10497c..2bf8bca6f 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/session/impl/SessionImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/session/impl/SessionImpl.java
@@ -1,8 +1,9 @@
 package com.taobao.arthas.core.shell.session.impl;
 
-import com.taobao.arthas.core.shell.ShellServer;
+import com.taobao.arthas.core.distribution.SharingResultDistributor;
 import com.taobao.arthas.core.shell.command.CommandResolver;
 import com.taobao.arthas.core.shell.session.Session;
+import com.taobao.arthas.core.shell.system.Job;
 import com.taobao.arthas.core.shell.system.impl.InternalCommandManager;
 
 import java.lang.instrument.Instrumentation;
@@ -21,6 +22,12 @@ public class SessionImpl implements Session {
 
     private Map<String, Object> data = new HashMap<String, Object>();
 
+    public SessionImpl() {
+        long now = System.currentTimeMillis();
+        data.put(CREATE_TIME, now);
+        this.setLastAccessTime(now);
+    }
+
     @Override
     public Session put(String key, Object obj) {
         if (obj == null) {
@@ -69,11 +76,6 @@ public class SessionImpl implements Session {
         return (String) data.get(ID);
     }
 
-    @Override
-    public ShellServer getServer() {
-        return (ShellServer) data.get(SERVER);
-    }
-
     @Override
     public long getPid() {
         return (Long) data.get(PID);
@@ -89,4 +91,45 @@ public class SessionImpl implements Session {
     public Instrumentation getInstrumentation() {
         return (Instrumentation) data.get(INSTRUMENTATION);
     }
+
+    @Override
+    public void setLastAccessTime(long time) {
+        data.put(LAST_ACCESS_TIME, time);
+    }
+
+    @Override
+    public long getLastAccessTime() {
+        return (Long)data.get(LAST_ACCESS_TIME);
+    }
+
+    @Override
+    public long getCreateTime() {
+        return (Long)data.get(CREATE_TIME);
+    }
+
+    @Override
+    public void setResultDistributor(SharingResultDistributor resultDistributor) {
+        data.put(RESULT_DISTRIBUTOR, resultDistributor);
+    }
+
+    @Override
+    public SharingResultDistributor getResultDistributor() {
+        return (SharingResultDistributor) data.get(RESULT_DISTRIBUTOR);
+    }
+
+    @Override
+    public void setForegroundJob(Job job) {
+        data.put(FOREGROUND_JOB, job);
+    }
+
+    @Override
+    public Job getForegroundJob() {
+        return (Job) data.get(FOREGROUND_JOB);
+    }
+
+    @Override
+    public boolean isTty() {
+        return get(TTY) != null;
+    }
+
 }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/session/impl/SessionManagerImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/session/impl/SessionManagerImpl.java
new file mode 100644
index 000000000..fb6cc5bd4
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/session/impl/SessionManagerImpl.java
@@ -0,0 +1,193 @@
+package com.taobao.arthas.core.shell.session.impl;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.taobao.arthas.core.command.model.MessageModel;
+import com.taobao.arthas.core.distribution.ResultConsumer;
+import com.taobao.arthas.core.distribution.SharingResultDistributor;
+import com.taobao.arthas.core.distribution.impl.SharingResultDistributorImpl;
+import com.taobao.arthas.core.server.ArthasBootstrap;
+import com.taobao.arthas.core.shell.ShellServerOptions;
+import com.taobao.arthas.core.shell.session.Session;
+import com.taobao.arthas.core.shell.session.SessionManager;
+import com.taobao.arthas.core.shell.system.Job;
+import com.taobao.arthas.core.shell.system.JobController;
+import com.taobao.arthas.core.shell.system.impl.InternalCommandManager;
+
+import java.lang.instrument.Instrumentation;
+import java.util.*;
+import java.util.concurrent.*;
+
+/**
+ * Arthas Session Manager
+ *
+ * @author gongdewei 2020-03-20
+ */
+public class SessionManagerImpl implements SessionManager {
+    private static final Logger logger = LoggerFactory.getLogger(SessionManagerImpl.class);
+    private final ArthasBootstrap bootstrap;
+    private final InternalCommandManager commandManager;
+    private final Instrumentation instrumentation;
+    private final JobController jobController;
+    private final long timeoutMillis;
+    private final long reaperInterval;
+    private final Map<String, Session> sessions;
+    private final long pid;
+    private boolean closed = false;
+    private ScheduledExecutorService scheduledExecutorService;
+
+    public SessionManagerImpl(ShellServerOptions options, ArthasBootstrap bootstrap, InternalCommandManager commandManager,
+                              JobController jobController) {
+        this.bootstrap = bootstrap;
+        this.commandManager = commandManager;
+        this.jobController = jobController;
+        this.sessions = new ConcurrentHashMap<String, Session>();
+        this.timeoutMillis = options.getSessionTimeout();
+        this.reaperInterval = options.getReaperInterval();
+        this.instrumentation = options.getInstrumentation();
+        this.pid = options.getPid();
+        //start evict session timer
+        this.setEvictTimer();
+    }
+
+
+    @Override
+    public Session createSession() {
+        Session session = new SessionImpl();
+        session.put(Session.COMMAND_MANAGER, commandManager);
+        session.put(Session.INSTRUMENTATION, instrumentation);
+        session.put(Session.PID, pid);
+        //session.put(Session.SERVER, server);
+        //session.put(Session.TTY, term);
+        String sessionId = UUID.randomUUID().toString();
+        session.put(Session.ID, sessionId);
+
+        //Result Distributor
+        session.setResultDistributor(new SharingResultDistributorImpl(session));
+
+        sessions.put(sessionId, session);
+        return session;
+    }
+
+    @Override
+    public Session getSession(String sessionId) {
+        return sessions.get(sessionId);
+    }
+
+    @Override
+    public Session removeSession(String sessionId) {
+        return sessions.remove(sessionId);
+    }
+
+    @Override
+    public void updateAccessTime(Session session) {
+        session.setLastAccessTime(System.currentTimeMillis());
+    }
+
+    @Override
+    public void close() {
+        //TODO clear resources while shutdown arthas
+        closed = true;
+        if (scheduledExecutorService != null) {
+            scheduledExecutorService.shutdownNow();
+        }
+
+        ArrayList<Session> sessions = new ArrayList<Session>(this.sessions.values());
+        for (Session session : sessions) {
+            SharingResultDistributor resultDistributor = session.getResultDistributor();
+            resultDistributor.appendResult(new MessageModel("arthas server is going to shutdown."));
+            resultDistributor.close();
+            logger.info("Removing session before shutdown: {}, last access time: {}", session.getSessionId(), session.getLastAccessTime());
+            this.removeSession(session.getSessionId());
+        }
+
+        jobController.close();
+        bootstrap.destroy();
+    }
+
+    private synchronized void setEvictTimer() {
+        if (!closed && reaperInterval > 0) {
+            scheduledExecutorService = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() {
+                @Override
+                public Thread newThread(Runnable r) {
+                    final Thread t = new Thread(r, "arthas-shell-server");
+                    return t;
+                }
+            });
+            scheduledExecutorService.scheduleAtFixedRate(new Runnable() {
+
+                @Override
+                public void run() {
+                    evictSessions();
+                }
+            }, 0, reaperInterval, TimeUnit.MILLISECONDS);
+        }
+    }
+
+    /**
+     * Check and remove inactive session
+     */
+    public void evictSessions() {
+        long now = System.currentTimeMillis();
+        List<Session> toClose = new ArrayList<Session>();
+        for (Session session : sessions.values()) {
+            // do not close if there is still job running,
+            // e.g. trace command might wait for a long time before condition is met
+            //TODO check background job size
+            if (now - session.getLastAccessTime() > timeoutMillis && session.getForegroundJob() == null) {
+                toClose.add(session);
+            }
+            evictConsumers(session);
+        }
+        for (Session session : toClose) {
+            //interrupt foreground job
+            Job job = session.getForegroundJob();
+            if (job != null) {
+                job.interrupt();
+            }
+            long timeOutInMinutes = timeoutMillis / 1000 / 60;
+            String reason = "session is inactive for " + timeOutInMinutes + " min(s).";
+            session.getResultDistributor().appendResult(new MessageModel(reason));
+            this.removeSession(session.getSessionId());
+            logger.info("Removing inactive session: {}, last access time: {}", session.getSessionId(), session.getLastAccessTime());
+        }
+    }
+
+    /**
+     * Check and remove inactive consumer
+     */
+    public void evictConsumers(Session session) {
+        SharingResultDistributor distributor = session.getResultDistributor();
+        if (distributor instanceof SharingResultDistributor) {
+            SharingResultDistributor sharingResultDistributor = (SharingResultDistributor) distributor;
+            List<ResultConsumer> consumers = sharingResultDistributor.getConsumers();
+            //remove inactive consumer from session directly
+            long now = System.currentTimeMillis();
+            for (ResultConsumer consumer : consumers) {
+                long inactiveTime = now - consumer.getLastAccessTime();
+                if (inactiveTime > 30000) {
+                    //inactive duration must be large than pollTimeLimit
+                    logger.info("Removing inactive consumer from session, sessionId: {}, consumerId: {}, inactive duration: {}",
+                            session.getSessionId(), consumer.getConsumerId(), inactiveTime);
+                    consumer.appendResult(new MessageModel("consumer is inactive for a while, please refresh the page."));
+                    sharingResultDistributor.removeConsumer(consumer);
+                }
+            }
+        }
+    }
+
+    @Override
+    public InternalCommandManager getCommandManager() {
+        return commandManager;
+    }
+
+    @Override
+    public Instrumentation getInstrumentation() {
+        return instrumentation;
+    }
+
+    @Override
+    public JobController getJobController() {
+        return jobController;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/system/Job.java b/core/src/main/java/com/taobao/arthas/core/shell/system/Job.java
index d884ba36b..e061264f2 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/system/Job.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/system/Job.java
@@ -57,6 +57,11 @@ public interface Job {
      */
     Job resume();
 
+    /**
+     * @return true if the job is running in background
+     */
+    boolean isRunInBackground();
+
     /**
      * Send the job to background.
      *
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/system/JobController.java b/core/src/main/java/com/taobao/arthas/core/shell/system/JobController.java
index a00454865..4ba2455c0 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/system/JobController.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/system/JobController.java
@@ -1,9 +1,11 @@
 package com.taobao.arthas.core.shell.system;
 
+import com.taobao.arthas.core.distribution.ResultDistributor;
 import com.taobao.arthas.core.shell.cli.CliToken;
 import com.taobao.arthas.core.shell.handlers.Handler;
-import com.taobao.arthas.core.shell.impl.ShellImpl;
+import com.taobao.arthas.core.shell.session.Session;
 import com.taobao.arthas.core.shell.system.impl.InternalCommandManager;
+import com.taobao.arthas.core.shell.term.Term;
 
 import java.util.List;
 import java.util.Set;
@@ -33,10 +35,13 @@ public interface JobController {
      *
      * @param commandManager command manager
      * @param tokens    the command tokens
-     * @param shell     the current shell
+     * @param session     the current session
+     * @param jobHandler  job event handler
+     * @param term     telnet term
+     * @param resultDistributor
      * @return the created job
      */
-    Job createJob(InternalCommandManager commandManager, List<CliToken> tokens, ShellImpl shell);
+    Job createJob(InternalCommandManager commandManager, List<CliToken> tokens, Session session, JobListener jobHandler, Term term, ResultDistributor resultDistributor);
 
     /**
      * Close the controller and terminate all the underlying jobs, a closed controller does not accept anymore jobs.
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/system/JobListener.java b/core/src/main/java/com/taobao/arthas/core/shell/system/JobListener.java
new file mode 100644
index 000000000..b3c889171
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/system/JobListener.java
@@ -0,0 +1,16 @@
+package com.taobao.arthas.core.shell.system;
+
+/**
+ * Job listener
+ * @author gongdewei 2020-03-23
+ */
+public interface JobListener {
+
+    void onForeground(Job job);
+
+    void onBackground(Job job);
+
+    void onTerminated(Job job);
+
+    void onSuspend(Job job);
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/GlobalJobControllerImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/GlobalJobControllerImpl.java
index 8fe83ae56..31137f3bc 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/GlobalJobControllerImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/GlobalJobControllerImpl.java
@@ -9,11 +9,15 @@ import java.util.concurrent.TimeUnit;
 import com.alibaba.arthas.deps.org.slf4j.Logger;
 import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
 import com.taobao.arthas.core.GlobalOptions;
+import com.taobao.arthas.core.distribution.ResultDistributor;
 import com.taobao.arthas.core.server.ArthasBootstrap;
 import com.taobao.arthas.core.shell.cli.CliToken;
 import com.taobao.arthas.core.shell.handlers.Handler;
-import com.taobao.arthas.core.shell.impl.ShellImpl;
+import com.taobao.arthas.core.shell.session.Session;
 import com.taobao.arthas.core.shell.system.Job;
+import com.taobao.arthas.core.shell.system.JobListener;
+import com.taobao.arthas.core.shell.term.Term;
+
 
 /**
  * 全局的Job Controller，不应该存在启停的概念，不需要在连接的断开时关闭，
@@ -49,8 +53,8 @@ public class GlobalJobControllerImpl extends JobControllerImpl {
     }
 
     @Override
-    public Job createJob(InternalCommandManager commandManager, List<CliToken> tokens, ShellImpl shell) {
-        final Job job = super.createJob(commandManager, tokens, shell);
+    public Job createJob(InternalCommandManager commandManager, List<CliToken> tokens, Session session, JobListener jobHandler, Term term, ResultDistributor resultDistributor) {
+        final Job job = super.createJob(commandManager, tokens, session, jobHandler, term, resultDistributor);
 
         /*
          * 达到超时时间将会停止job
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobControllerImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobControllerImpl.java
index eedbddf7f..e21b3551d 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobControllerImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobControllerImpl.java
@@ -1,6 +1,7 @@
 package com.taobao.arthas.core.shell.system.impl;
 
 import com.taobao.arthas.core.GlobalOptions;
+import com.taobao.arthas.core.distribution.ResultDistributor;
 import com.taobao.arthas.core.shell.cli.CliToken;
 import com.taobao.arthas.core.shell.command.Command;
 import com.taobao.arthas.core.shell.command.internal.RedirectHandler;
@@ -8,9 +9,10 @@ import com.taobao.arthas.core.shell.command.internal.StdoutHandler;
 import com.taobao.arthas.core.shell.command.internal.TermHandler;
 import com.taobao.arthas.core.shell.future.Future;
 import com.taobao.arthas.core.shell.handlers.Handler;
-import com.taobao.arthas.core.shell.impl.ShellImpl;
+import com.taobao.arthas.core.shell.session.Session;
 import com.taobao.arthas.core.shell.system.Job;
 import com.taobao.arthas.core.shell.system.JobController;
+import com.taobao.arthas.core.shell.system.JobListener;
 import com.taobao.arthas.core.shell.system.Process;
 import com.taobao.arthas.core.shell.system.impl.ProcessImpl.ProcessOutput;
 import com.taobao.arthas.core.shell.term.Term;
@@ -35,6 +37,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 /**
  * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
  * @author hengyunabc 2019-05-14
+ * @author gongdewei 2020-03-23
  */
 public class JobControllerImpl implements JobController {
 
@@ -58,16 +61,16 @@ public class JobControllerImpl implements JobController {
     }
 
     @Override
-    public Job createJob(InternalCommandManager commandManager, List<CliToken> tokens, ShellImpl shell) {
+    public Job createJob(InternalCommandManager commandManager, List<CliToken> tokens, Session session, JobListener jobHandler, Term term, ResultDistributor resultDistributor) {
         int jobId = idGenerator.incrementAndGet();
         StringBuilder line = new StringBuilder();
         for (CliToken arg : tokens) {
             line.append(arg.raw());
         }
         boolean runInBackground = runInBackground(tokens);
-        Process process = createProcess(tokens, commandManager, jobId, shell.term());
+        Process process = createProcess(tokens, commandManager, jobId, term, resultDistributor);
         process.setJobId(jobId);
-        JobImpl job = new JobImpl(jobId, this, process, line.toString(), runInBackground, shell);
+        JobImpl job = new JobImpl(jobId, this, process, line.toString(), runInBackground, session, jobHandler);
         jobs.put(jobId, job);
         return job;
     }
@@ -120,9 +123,10 @@ public class JobControllerImpl implements JobController {
      * @param commandManager command manager
      * @param jobId job id
      * @param term term
+     * @param resultDistributor
      * @return the created process
      */
-    private Process createProcess(List<CliToken> line, InternalCommandManager commandManager, int jobId, Term term) {
+    private Process createProcess(List<CliToken> line, InternalCommandManager commandManager, int jobId, Term term, ResultDistributor resultDistributor) {
         try {
             ListIterator<CliToken> tokens = line.listIterator();
             while (tokens.hasNext()) {
@@ -130,7 +134,7 @@ public class JobControllerImpl implements JobController {
                 if (token.isText()) {
                     Command command = commandManager.getCommand(token.value());
                     if (command != null) {
-                        return createCommandProcess(command, tokens, jobId, term);
+                        return createCommandProcess(command, tokens, jobId, term, resultDistributor);
                     } else {
                         throw new IllegalArgumentException(token.value() + ": command not found");
                     }
@@ -152,7 +156,7 @@ public class JobControllerImpl implements JobController {
         return runInBackground;
     }
 
-    private Process createCommandProcess(Command command, ListIterator<CliToken> tokens, int jobId, Term term) throws IOException {
+    private Process createCommandProcess(Command command, ListIterator<CliToken> tokens, int jobId, Term term, ResultDistributor resultDistributor) throws IOException {
         List<CliToken> remaining = new ArrayList<CliToken>();
         List<CliToken> pipelineTokens = new ArrayList<CliToken>();
         boolean isPipeline = false;
@@ -199,7 +203,9 @@ public class JobControllerImpl implements JobController {
             }
         }
         ProcessOutput ProcessOutput = new ProcessOutput(stdoutHandlerChain, cacheLocation, term);
-        return new ProcessImpl(command, remaining, command.processHandler(), ProcessOutput);
+        ProcessImpl process = new ProcessImpl(command, remaining, command.processHandler(), ProcessOutput, resultDistributor);
+        process.setTty(term);
+        return process;
     }
 
     private String getRedirectFileName(ListIterator<CliToken> tokens) {
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobImpl.java
index 6f37e8632..c960f5d53 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/JobImpl.java
@@ -7,20 +7,16 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 import com.taobao.arthas.core.shell.future.Future;
 import com.taobao.arthas.core.shell.handlers.Handler;
-import com.taobao.arthas.core.shell.handlers.shell.ShellForegroundUpdateHandler;
-import com.taobao.arthas.core.shell.impl.ShellImpl;
 import com.taobao.arthas.core.shell.session.Session;
 import com.taobao.arthas.core.shell.system.ExecStatus;
 import com.taobao.arthas.core.shell.system.Job;
+import com.taobao.arthas.core.shell.system.JobListener;
 import com.taobao.arthas.core.shell.system.Process;
-import com.taobao.arthas.core.shell.term.Term;
-import com.taobao.arthas.core.shell.term.impl.TermImpl;
-import com.taobao.arthas.core.util.Constants;
-import com.taobao.arthas.core.util.FileUtils;
 
 /**
  * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
  * @author hengyunabc 2019-05-14
+ * @author gongdewei 2020-03-23
  */
 public class JobImpl implements Job {
 
@@ -28,25 +24,30 @@ public class JobImpl implements Job {
     final JobControllerImpl controller;
     final Process process;
     final String line;
+    private volatile Session session;
     private volatile ExecStatus actualStatus; // Used internally for testing only
     volatile long lastStopped; // When the job was last stopped
-    volatile ShellImpl shell;
+    volatile JobListener jobHandler;
     volatile Handler<ExecStatus> statusUpdateHandler;
     volatile Date timeoutDate;
     final Future<Void> terminateFuture;
     final AtomicBoolean runInBackground;
-    final Handler<Job> foregroundUpdatedHandler;
+    //final Handler<Job> foregroundUpdatedHandler;
 
     JobImpl(int id, final JobControllerImpl controller, Process process, String line, boolean runInBackground,
-            ShellImpl shell) {
+            Session session, JobListener jobHandler) {
         this.id = id;
         this.controller = controller;
         this.process = process;
         this.line = line;
+        this.session = session;
         this.terminateFuture = Future.future();
         this.runInBackground = new AtomicBoolean(runInBackground);
-        this.shell = shell;
-        this.foregroundUpdatedHandler = new ShellForegroundUpdateHandler(shell);
+        this.jobHandler = jobHandler;
+        if (jobHandler == null) {
+            throw new IllegalArgumentException("JobListener is required");
+        }
+        //this.foregroundUpdatedHandler = new ShellForegroundUpdateHandler(shell);
         process.terminatedHandler(new TerminatedHandler(controller));
     }
 
@@ -76,7 +77,7 @@ public class JobImpl implements Job {
 
     @Override
     public Session getSession() {
-        return shell.session();
+        return session;
     }
 
     @Override
@@ -89,19 +90,21 @@ public class JobImpl implements Job {
 
         runInBackground.set(!foreground);
 
-        if (foreground) {
-            if (foregroundUpdatedHandler != null) {
-                foregroundUpdatedHandler.handle(this);
-            }
-        }
+//        if (foreground) {
+//            if (foregroundUpdatedHandler != null) {
+//                foregroundUpdatedHandler.handle(this);
+//            }
+//        }
         if (statusUpdateHandler != null) {
             statusUpdateHandler.handle(process.status());
         }
 
-        if (foreground) {
-            shell.setForegroundJob(this);
-        } else {
-            shell.setForegroundJob(null);
+        if (this.status() == ExecStatus.RUNNING) {
+            if (foreground) {
+                jobHandler.onForeground(this);
+            } else {
+                jobHandler.onBackground(this);
+            }
         }
         return this;
     }
@@ -113,14 +116,15 @@ public class JobImpl implements Job {
         } catch (IllegalStateException ignore) {
             return this;
         }
-        if (!runInBackground.get() && foregroundUpdatedHandler != null) {
-            foregroundUpdatedHandler.handle(null);
-        }
+//        if (!runInBackground.get() && foregroundUpdatedHandler != null) {
+//            foregroundUpdatedHandler.handle(null);
+//        }
         if (statusUpdateHandler != null) {
             statusUpdateHandler.handle(process.status());
         }
 
-        shell.setForegroundJob(null);
+//        shell.setForegroundJob(null);
+        jobHandler.onSuspend(this);
         return this;
     }
 
@@ -147,6 +151,11 @@ public class JobImpl implements Job {
         return line;
     }
 
+    @Override
+    public boolean isRunInBackground() {
+        return runInBackground.get();
+    }
+
     @Override
     public Job toBackground() {
         if (!this.runInBackground.get()) {
@@ -156,10 +165,12 @@ public class JobImpl implements Job {
                 if (statusUpdateHandler != null) {
                     statusUpdateHandler.handle(process.status());
                 }
+                jobHandler.onBackground(this);
             }
         }
 
-        shell.setForegroundJob(null);
+//        shell.setForegroundJob(null);
+//        jobHandler.onBackground(this);
         return this;
     }
 
@@ -167,15 +178,16 @@ public class JobImpl implements Job {
     public Job toForeground() {
         if (this.runInBackground.get()) {
             if (runInBackground.compareAndSet(true, false)) {
-                if (foregroundUpdatedHandler != null) {
-                    foregroundUpdatedHandler.handle(this);
-                }
+//                if (foregroundUpdatedHandler != null) {
+//                    foregroundUpdatedHandler.handle(this);
+//                }
                 process.toForeground();
                 if (statusUpdateHandler != null) {
                     statusUpdateHandler.handle(process.status());
                 }
 
-                shell.setForegroundJob(this);
+//                shell.setForegroundJob(this);
+                jobHandler.onForeground(this);
             }
         }
 
@@ -194,26 +206,34 @@ public class JobImpl implements Job {
 
     @Override
     public Job run(boolean foreground) {
-        if (foreground && foregroundUpdatedHandler != null) {
-            foregroundUpdatedHandler.handle(this);
-        }
+//        if (foreground && foregroundUpdatedHandler != null) {
+//            foregroundUpdatedHandler.handle(this);
+//        }
 
         actualStatus = ExecStatus.RUNNING;
         if (statusUpdateHandler != null) {
             statusUpdateHandler.handle(ExecStatus.RUNNING);
         }
-        process.setTty(shell.term());
-        process.setSession(shell.session());
+        //set process's tty in JobControllerImpl.createCommandProcess
+        //process.setTty(shell.term());
+        process.setSession(this.session);
         process.run(foreground);
 
-        if (!foreground && foregroundUpdatedHandler != null) {
-            foregroundUpdatedHandler.handle(null);
-        }
-
-        if (foreground) {
-            shell.setForegroundJob(this);
-        } else {
-            shell.setForegroundJob(null);
+//        if (!foreground && foregroundUpdatedHandler != null) {
+//            foregroundUpdatedHandler.handle(null);
+//        }
+//
+//        if (foreground) {
+//            shell.setForegroundJob(this);
+//        } else {
+//            shell.setForegroundJob(null);
+//        }
+        if (this.status() == ExecStatus.RUNNING) {
+            if (foreground) {
+                jobHandler.onForeground(this);
+            } else {
+                jobHandler.onBackground(this);
+            }
         }
         return this;
     }
@@ -228,24 +248,25 @@ public class JobImpl implements Job {
 
         @Override
         public void handle(Integer exitCode) {
-            if (!runInBackground.get() && actualStatus.equals(ExecStatus.RUNNING)) {
+//            if (!runInBackground.get() && actualStatus.equals(ExecStatus.RUNNING)) {
                 // 只有前台在运行的任务，才需要调用foregroundUpdateHandler
-                if (foregroundUpdatedHandler != null) {
-                    foregroundUpdatedHandler.handle(null);
-                }
-            }
+//                if (foregroundUpdatedHandler != null) {
+//                    foregroundUpdatedHandler.handle(null);
+//                }
+//            }
+            jobHandler.onTerminated(JobImpl.this);
             controller.removeJob(JobImpl.this.id);
             if (statusUpdateHandler != null) {
                 statusUpdateHandler.handle(ExecStatus.TERMINATED);
             }
             terminateFuture.complete();
 
-            // save command history
-            Term term = shell.term();
-            if (term instanceof TermImpl) {
-                List<int[]> history = ((TermImpl) term).getReadline().getHistory();
-                FileUtils.saveCommandHistory(history, new File(Constants.CMD_HISTORY_FILE));
-            }
+            // save command history (move to JobControllerImpl.ShellJobHandler.onTerminated)
+//            Term term = shell.term();
+//            if (term instanceof TermImpl) {
+//                List<int[]> history = ((TermImpl) term).getReadline().getHistory();
+//                FileUtils.saveCommandHistory(history, new File(Constants.CMD_HISTORY_FILE));
+//            }
         }
     }
 
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/ProcessImpl.java b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/ProcessImpl.java
index b09711172..249bcf7ad 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/system/impl/ProcessImpl.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/system/impl/ProcessImpl.java
@@ -4,6 +4,11 @@ import com.alibaba.arthas.deps.org.slf4j.Logger;
 import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
 import com.taobao.arthas.core.advisor.AdviceListener;
 import com.taobao.arthas.core.advisor.AdviceWeaver;
+import com.taobao.arthas.core.command.basic1000.HelpCommand;
+import com.taobao.arthas.core.command.model.ResultModel;
+import com.taobao.arthas.core.command.model.StatusModel;
+import com.taobao.arthas.core.distribution.ResultDistributor;
+import com.taobao.arthas.core.distribution.impl.TermResultDistributorImpl;
 import com.taobao.arthas.core.server.ArthasBootstrap;
 import com.taobao.arthas.core.shell.cli.CliToken;
 import com.taobao.arthas.core.shell.command.Command;
@@ -16,12 +21,8 @@ import com.taobao.arthas.core.shell.system.ExecStatus;
 import com.taobao.arthas.core.shell.system.Process;
 import com.taobao.arthas.core.shell.system.ProcessAware;
 import com.taobao.arthas.core.shell.term.Tty;
-import com.taobao.arthas.core.util.usage.StyledUsageFormatter;
 import com.taobao.middleware.cli.CLIException;
 import com.taobao.middleware.cli.CommandLine;
-import com.taobao.middleware.cli.UsageMessageFormatter;
-import com.taobao.text.Color;
-
 import io.termd.core.function.Function;
 
 import java.lang.instrument.ClassFileTransformer;
@@ -32,6 +33,7 @@ import java.util.concurrent.atomic.AtomicInteger;
 
 /**
  * @author beiwei30 on 10/11/2016.
+ * @author gongdewei 2020-03-26
  */
 public class ProcessImpl implements Process {
 
@@ -55,16 +57,18 @@ public class ProcessImpl implements Process {
     private Handler<String> stdinHandler;
     private Handler<Void> resizeHandler;
     private Integer exitCode;
-    private CommandProcess process;
+    private CommandProcessImpl process;
     private Date startTime;
     private ProcessOutput processOutput;
     private int jobId;
+    private ResultDistributor resultDistributor;
 
     public ProcessImpl(Command commandContext, List<CliToken> args, Handler<CommandProcess> handler,
-                       ProcessOutput processOutput) {
+                       ProcessOutput processOutput, ResultDistributor resultDistributor) {
         this.commandContext = commandContext;
         this.handler = handler;
         this.args = args;
+        this.resultDistributor = resultDistributor;
         this.processStatus = ExecStatus.READY;
         this.processOutput = processOutput;
     }
@@ -236,13 +240,15 @@ public class ProcessImpl implements Process {
 
     @Override
     public void terminate(Handler<Void> completionHandler) {
-        if (!terminate(-10, completionHandler)) {
+        if (!terminate(-10, completionHandler, null)) {
             throw new IllegalStateException("Cannot terminate terminated process");
         }
     }
 
-    private synchronized boolean terminate(int exitCode, Handler<Void> completionHandler) {
+    private synchronized boolean terminate(int exitCode, Handler<Void> completionHandler, String message) {
         if (processStatus != ExecStatus.TERMINATED) {
+            //add status message
+            this.appendResult(new StatusModel(exitCode, message));
             if (process != null) {
                 processOutput.close();
             }
@@ -256,6 +262,13 @@ public class ProcessImpl implements Process {
         }
     }
 
+    private void appendResult(ResultModel result) {
+        result.setJobId(jobId);
+        if (resultDistributor != null) {
+            resultDistributor.appendResult(result);
+        }
+    }
+
     private void updateStatus(ExecStatus statusUpdate, Integer exitCodeUpdate, boolean foregroundUpdate,
                               Handler<Void> handler, Handler<Integer> terminatedHandler,
                               Handler<Void> completionHandler) {
@@ -320,6 +333,11 @@ public class ProcessImpl implements Process {
             throw new IllegalStateException("Cannot execute process without a TTY set");
         }
 
+        process = new CommandProcessImpl(this, tty);
+        if (resultDistributor == null) {
+            resultDistributor = new TermResultDistributorImpl(process);
+        }
+
         final List<String> args2 = new LinkedList<String>();
         for (CliToken arg : args) {
             if (arg.isText()) {
@@ -331,25 +349,20 @@ public class ProcessImpl implements Process {
         try {
             if (commandContext.cli() != null) {
                 if (commandContext.cli().parse(args2, false).isAskingForHelp()) {
-                    UsageMessageFormatter formatter = new StyledUsageFormatter(Color.green);
-                    formatter.setWidth(tty.width());
-                    StringBuilder usage = new StringBuilder();
-                    commandContext.cli().usage(usage, formatter);
-                    usage.append('\n');
-                    tty.write(usage.toString());
+                    appendResult(new HelpCommand().createHelpDetailModel(commandContext));
                     terminate();
                     return;
                 }
 
                 cl = commandContext.cli().parse(args2);
+                process.setArgs2(args2);
+                process.setCommandLine(cl);
             }
         } catch (CLIException e) {
-            tty.write(e.getMessage() + "\n");
-            terminate();
+            terminate(-10, null, e.getMessage());
             return;
         }
 
-        process = new CommandProcessImpl(this, args2, tty, cl);
         if (cacheLocation() != null) {
             process.echoTips("job id  : " + this.jobId + "\n");
             process.echoTips("cache location  : " + cacheLocation() + "\n");
@@ -372,27 +385,25 @@ public class ProcessImpl implements Process {
                 handler.handle(process);
             } catch (Throwable t) {
                 logger.error("Error during processing the command:", t);
-                process.write("Error during processing the command, exception type: " + t.getClass().getName() + ", message:" + t.getMessage()
-                        + ", please check $HOME/logs/arthas/arthas.log for more details. \n");
-                terminate(1, null);
+                process.end(1, "Error during processing the command: " + t.getClass().getName() + ", message:" + t.getMessage()
+                        + ", please check $HOME/logs/arthas/arthas.log for more details." );
             }
         }
     }
 
     private class CommandProcessImpl implements CommandProcess {
+
         private final Process process;
-        private final List<String> args2;
         private final Tty tty;
-        private final CommandLine commandLine;
+        private List<String> args2;
+        private CommandLine commandLine;
         private AtomicInteger times = new AtomicInteger();
         private AdviceListener listener = null;
         private ClassFileTransformer transformer;
 
-        public CommandProcessImpl(Process process, List<String> args2, Tty tty, CommandLine commandLine) {
+        public CommandProcessImpl(Process process, Tty tty) {
             this.process = process;
-            this.args2 = args2;
             this.tty = tty;
-            this.commandLine = commandLine;
         }
 
         @Override
@@ -440,6 +451,14 @@ public class ProcessImpl implements Process {
             return times;
         }
 
+        public void setArgs2(List<String> args2) {
+            this.args2 = args2;
+        }
+
+        public void setCommandLine(CommandLine commandLine) {
+            this.commandLine = commandLine;
+        }
+
         @Override
         public CommandProcess stdinHandler(Handler<String> handler) {
             stdinHandler = handler;
@@ -578,13 +597,27 @@ public class ProcessImpl implements Process {
 
         @Override
         public void end(int statusCode) {
-            terminate(statusCode, null);
+            end(statusCode, null);
+        }
+
+        @Override
+        public void end(int statusCode, String message) {
+            terminate(statusCode, null, message);
         }
 
         @Override
         public boolean isRunning() {
             return processStatus == ExecStatus.RUNNING;
         }
+
+        @Override
+        public void appendResult(ResultModel result) {
+            if (processStatus != ExecStatus.RUNNING) {
+                throw new IllegalStateException(
+                        "Cannot write to standard output when " + status().name().toLowerCase());
+            }
+            ProcessImpl.this.appendResult(result);
+        }
     }
 
     static class ProcessOutput {
@@ -620,7 +653,10 @@ public class ProcessImpl implements Process {
 
         private void write(String data) {
             if (stdoutHandlerChain != null) {
-                for (Function<String, String> function : stdoutHandlerChain) {
+                //hotspot, reduce memory fragment (foreach/iterator)
+                int size = stdoutHandlerChain.size();
+                for (int i = 0; i < size; i++) {
+                    Function<String, String> function = stdoutHandlerChain.get(i);
                     data = function.apply(data);
                 }
             }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/HttpTermServer.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/HttpTermServer.java
index 2ad5f6288..c8dafe942 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/HttpTermServer.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/HttpTermServer.java
@@ -7,7 +7,7 @@ import com.taobao.arthas.core.shell.handlers.Handler;
 import com.taobao.arthas.core.shell.term.Term;
 import com.taobao.arthas.core.shell.term.TermServer;
 import com.taobao.arthas.core.shell.term.impl.http.NettyWebsocketTtyBootstrap;
-import com.taobao.arthas.core.shell.term.impl.httptelnet.HttpTelnetTermServer;
+import io.netty.util.concurrent.EventExecutorGroup;
 import io.termd.core.function.Consumer;
 import io.termd.core.tty.TtyConnection;
 
@@ -25,11 +25,13 @@ public class HttpTermServer extends TermServer {
     private String hostIp;
     private int port;
     private long connectionTimeout;
+    private EventExecutorGroup workerGroup;
 
-    public HttpTermServer(String hostIp, int port, long connectionTimeout) {
+    public HttpTermServer(String hostIp, int port, long connectionTimeout, EventExecutorGroup workerGroup) {
         this.hostIp = hostIp;
         this.port = port;
         this.connectionTimeout = connectionTimeout;
+        this.workerGroup = workerGroup;
     }
 
     @Override
@@ -41,7 +43,7 @@ public class HttpTermServer extends TermServer {
     @Override
     public TermServer listen(Handler<Future<TermServer>> listenHandler) {
         // TODO: charset and inputrc from options
-        bootstrap = new NettyWebsocketTtyBootstrap().setHost(hostIp).setPort(port);
+        bootstrap = new NettyWebsocketTtyBootstrap(workerGroup).setHost(hostIp).setPort(port);
         try {
             bootstrap.start(new Consumer<TtyConnection>() {
                 @Override
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/HttpRequestHandler.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/HttpRequestHandler.java
index 8c101168e..d417e3518 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/HttpRequestHandler.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/HttpRequestHandler.java
@@ -1,6 +1,7 @@
 package com.taobao.arthas.core.shell.term.impl.http;
 
 import java.io.File;
+import java.io.IOException;
 import java.io.InputStream;
 import java.net.URI;
 import java.net.URL;
@@ -8,6 +9,7 @@ import java.net.URL;
 import com.alibaba.arthas.deps.org.slf4j.Logger;
 import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
 import com.taobao.arthas.common.IOUtils;
+import com.taobao.arthas.core.shell.term.impl.http.api.HttpApiHandler;
 import com.taobao.arthas.core.shell.term.impl.httptelnet.HttpTelnetTermServer;
 
 import io.netty.channel.ChannelFuture;
@@ -15,7 +17,6 @@ import io.netty.channel.ChannelFutureListener;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.SimpleChannelInboundHandler;
 import io.netty.handler.codec.http.DefaultFullHttpResponse;
-import io.netty.handler.codec.http.DefaultHttpResponse;
 import io.netty.handler.codec.http.FullHttpRequest;
 import io.netty.handler.codec.http.FullHttpResponse;
 import io.netty.handler.codec.http.HttpHeaderNames;
@@ -27,9 +28,13 @@ import io.netty.handler.codec.http.LastHttpContent;
 import io.termd.core.http.HttpTtyConnection;
 import io.termd.core.util.Logging;
 
+import static com.taobao.arthas.core.util.HttpUtils.createRedirectResponse;
+import static com.taobao.arthas.core.util.HttpUtils.createResponse;
+
 /**
  * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
  * @author hengyunabc 2019-11-06
+ * @author gongdewei 2020-03-18
  */
 public class HttpRequestHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
     private static final Logger logger = LoggerFactory.getLogger(HttpTelnetTermServer.class);
@@ -38,10 +43,13 @@ public class HttpRequestHandler extends SimpleChannelInboundHandler<FullHttpRequ
 
     private File dir;
 
+    private HttpApiHandler httpApiHandler;
+
     public HttpRequestHandler(String wsUri, File dir) {
         this.wsUri = wsUri;
         this.dir = dir;
         dir.mkdirs();
+        this.httpApiHandler = HttpApiHandler.getInstance();
     }
 
     @Override
@@ -53,67 +61,105 @@ public class HttpRequestHandler extends SimpleChannelInboundHandler<FullHttpRequ
                 send100Continue(ctx);
             }
 
-            HttpResponse response = new DefaultHttpResponse(request.protocolVersion(),
-                    HttpResponseStatus.INTERNAL_SERVER_ERROR);
-
+            HttpResponse response = null;
             String path = new URI(request.uri()).getPath();
-
             if ("/".equals(path)) {
                 path = "/index.html";
             }
 
-            InputStream in = null;
+            boolean isHttpApiResponse = false;
             try {
-
-                DefaultFullHttpResponse fileViewResult = DirectoryBrowser.view(dir, path, request.protocolVersion());
-
-                if (fileViewResult != null) {
-                    response = fileViewResult;
-                } else {
-                    URL res = HttpTtyConnection.class.getResource("/com/taobao/arthas/core/http" + path);
-                    if (res != null) {
-                        DefaultFullHttpResponse fullResp = new DefaultFullHttpResponse(request.protocolVersion(),
-                                HttpResponseStatus.OK);
-                        in = res.openStream();
-                        byte[] tmp = new byte[256];
-                        for (int l = 0; l != -1; l = in.read(tmp)) {
-                            fullResp.content().writeBytes(tmp, 0, l);
-                        }
-                        int li = path.lastIndexOf('.');
-                        if (li != -1 && li != path.length() - 1) {
-                            String ext = path.substring(li + 1, path.length());
-                            String contentType;
-                            if ("html".equals(ext)) {
-                                contentType = "text/html";
-                            } else if ("js".equals(ext)) {
-                                contentType = "application/javascript";
-                            } else if ("css".equals(ext)) {
-                                contentType = "text/css";
-                            } else {
-                                contentType = null;
-                            }
-
-                            if (contentType != null) {
-                                fullResp.headers().set(HttpHeaderNames.CONTENT_TYPE, contentType);
-                            }
-                        }
-                        response = fullResp;
-                    } else {
-                        response.setStatus(HttpResponseStatus.NOT_FOUND);
-                    }
+                //handle http restful api
+                if ("/api".equals(path)) {
+                    response = httpApiHandler.handle(request);
+                    isHttpApiResponse = true;
                 }
 
+                //handle webui requests
+                if (path.equals("/ui")){
+                    response = createRedirectResponse(request, "/ui/");
+                }
+                if (path.equals("/ui/")) {
+                    path += "index.html";
+                }
+
+                //try classpath resource first
+                if (response == null){
+                    response = readFileFromResource(request, path);
+                }
+
+                //try output dir later, avoid overlay classpath resources files
+                if (response == null){
+                    response = DirectoryBrowser.view(dir, path, request.protocolVersion());
+                }
+
+                //not found
+                if (response == null){
+                    response = createResponse(request, HttpResponseStatus.NOT_FOUND, "Not found");
+                }
             } catch (Throwable e) {
                 logger.error("arthas process http request error: " + request.uri(), e);
             } finally {
+                //If it is null, an error may occur
+                if (response == null){
+                    response = createResponse(request, HttpResponseStatus.INTERNAL_SERVER_ERROR, "Server error");
+                }
                 ctx.write(response);
                 ChannelFuture future = ctx.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT);
                 future.addListener(ChannelFutureListener.CLOSE);
-                IOUtils.close(in);
+
+                //reuse http api response buf
+                if (isHttpApiResponse && response instanceof DefaultFullHttpResponse) {
+                    final HttpResponse finalResponse = response;
+                    future.addListener(new ChannelFutureListener() {
+                        @Override
+                        public void operationComplete(ChannelFuture future) throws Exception {
+                            httpApiHandler.onCompleted((DefaultFullHttpResponse) finalResponse);
+                        }
+                    });
+                }
             }
         }
     }
 
+    private FullHttpResponse readFileFromResource(FullHttpRequest request, String path) throws IOException {
+        DefaultFullHttpResponse fullResp = null;
+        InputStream in = null;
+        try {
+            URL res = HttpTtyConnection.class.getResource("/com/taobao/arthas/core/http" + path);
+            if (res != null) {
+                fullResp = new DefaultFullHttpResponse(request.protocolVersion(),
+                        HttpResponseStatus.OK);
+                in = res.openStream();
+                byte[] tmp = new byte[256];
+                for (int l = 0; l != -1; l = in.read(tmp)) {
+                    fullResp.content().writeBytes(tmp, 0, l);
+                }
+                int li = path.lastIndexOf('.');
+                if (li != -1 && li != path.length() - 1) {
+                    String ext = path.substring(li + 1, path.length());
+                    String contentType;
+                    if ("html".equals(ext)) {
+                        contentType = "text/html";
+                    } else if ("js".equals(ext)) {
+                        contentType = "application/javascript";
+                    } else if ("css".equals(ext)) {
+                        contentType = "text/css";
+                    } else {
+                        contentType = null;
+                    }
+
+                    if (contentType != null) {
+                        fullResp.headers().set(HttpHeaderNames.CONTENT_TYPE, contentType);
+                    }
+                }
+            }
+        } finally {
+            IOUtils.close(in);
+        }
+        return fullResp;
+    }
+
     private static void send100Continue(ChannelHandlerContext ctx) {
         FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.CONTINUE);
         ctx.writeAndFlush(response);
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/NettyWebsocketTtyBootstrap.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/NettyWebsocketTtyBootstrap.java
index fefffce62..e6f5fd791 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/NettyWebsocketTtyBootstrap.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/NettyWebsocketTtyBootstrap.java
@@ -10,6 +10,7 @@ import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.handler.logging.LogLevel;
 import io.netty.handler.logging.LoggingHandler;
+import io.netty.util.concurrent.EventExecutorGroup;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.GenericFutureListener;
 import io.netty.util.concurrent.ImmediateEventExecutor;
@@ -30,8 +31,10 @@ public class NettyWebsocketTtyBootstrap {
     private int port;
     private EventLoopGroup group;
     private Channel channel;
+    private EventExecutorGroup workerGroup;
 
-    public NettyWebsocketTtyBootstrap() {
+    public NettyWebsocketTtyBootstrap(EventExecutorGroup workerGroup) {
+        this.workerGroup = workerGroup;
         this.host = "localhost";
         this.port = 8080;
     }
@@ -59,7 +62,7 @@ public class NettyWebsocketTtyBootstrap {
 
         ServerBootstrap b = new ServerBootstrap();
         b.group(group).channel(NioServerSocketChannel.class).handler(new LoggingHandler(LogLevel.INFO))
-                .childHandler(new TtyServerInitializer(channelGroup, handler));
+                .childHandler(new TtyServerInitializer(channelGroup, handler, workerGroup));
 
         final ChannelFuture f = b.bind(host, port);
         f.addListener(new GenericFutureListener<Future<? super Void>>() {
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/TtyServerInitializer.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/TtyServerInitializer.java
index 1dacb1f7a..57ba3c9a6 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/TtyServerInitializer.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/TtyServerInitializer.java
@@ -1,7 +1,5 @@
 package com.taobao.arthas.core.shell.term.impl.http;
 
-import java.io.File;
-
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelPipeline;
 import io.netty.channel.group.ChannelGroup;
@@ -10,9 +8,12 @@ import io.netty.handler.codec.http.HttpObjectAggregator;
 import io.netty.handler.codec.http.HttpServerCodec;
 import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
 import io.netty.handler.stream.ChunkedWriteHandler;
+import io.netty.util.concurrent.EventExecutorGroup;
 import io.termd.core.function.Consumer;
 import io.termd.core.tty.TtyConnection;
 
+import java.io.File;
+
 
 /**
  * @author <a href="mailto:julien@julienviet.com">Julien Viet</a>
@@ -21,19 +22,22 @@ public class TtyServerInitializer extends ChannelInitializer<SocketChannel> {
 
   private final ChannelGroup group;
   private final Consumer<TtyConnection> handler;
+  private EventExecutorGroup workerGroup;
 
-  public TtyServerInitializer(ChannelGroup group, Consumer<TtyConnection> handler) {
+  public TtyServerInitializer(ChannelGroup group, Consumer<TtyConnection> handler, EventExecutorGroup workerGroup) {
       this.group = group;
       this.handler = handler;
+    this.workerGroup = workerGroup;
   }
 
   @Override
   protected void initChannel(SocketChannel ch) throws Exception {
+
     ChannelPipeline pipeline = ch.pipeline();
     pipeline.addLast(new HttpServerCodec());
     pipeline.addLast(new ChunkedWriteHandler());
     pipeline.addLast(new HttpObjectAggregator(64 * 1024));
-    pipeline.addLast(new HttpRequestHandler("/ws", new File("arthas-output")));
+    pipeline.addLast(workerGroup, "HttpRequestHandler", new HttpRequestHandler("/ws", new File("arthas-output")));
     pipeline.addLast(new WebSocketServerProtocolHandler("/ws"));
     pipeline.addLast(new TtyWebSocketFrameHandler(group, handler));
   }
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiAction.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiAction.java
new file mode 100644
index 000000000..c6dfdcf29
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiAction.java
@@ -0,0 +1,48 @@
+package com.taobao.arthas.core.shell.term.impl.http.api;
+
+/**
+ * Http api action enums
+ *
+ * @author gongdewei 2020-03-25
+ */
+public enum ApiAction {
+    /**
+     * Execute command synchronized
+     */
+    EXEC,
+
+    /**
+     * Execute command async
+     */
+    ASYNC_EXEC,
+
+    /**
+     * Interrupt executing job
+     */
+    INTERRUPT_JOB,
+
+    /**
+     * Pull the results from result queue of the session
+     */
+    PULL_RESULTS,
+
+    /**
+     * Create a new session
+     */
+    INIT_SESSION,
+
+    /**
+     * Join a exist session
+     */
+    JOIN_SESSION,
+
+    /**
+     * Terminate the session
+     */
+    CLOSE_SESSION,
+
+    /**
+     * Get session info
+     */
+    SESSION_INFO
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiException.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiException.java
new file mode 100644
index 000000000..347ff553e
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiException.java
@@ -0,0 +1,16 @@
+package com.taobao.arthas.core.shell.term.impl.http.api;
+
+/**
+ * Http Api exception
+ * @author gongdewei 2020-03-19
+ */
+public class ApiException extends Exception {
+
+    public ApiException(String message) {
+        super(message);
+    }
+
+    public ApiException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiRequest.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiRequest.java
new file mode 100644
index 000000000..a3d2da354
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiRequest.java
@@ -0,0 +1,87 @@
+package com.taobao.arthas.core.shell.term.impl.http.api;
+
+import java.util.Map;
+
+/**
+ * Http Api request
+ *
+ * @author gongdewei 2020-03-19
+ */
+public class ApiRequest {
+    private String action;
+    private String command;
+    private String requestId;
+    private String sessionId;
+    private String consumerId;
+    private Integer timeout;
+    private Map<String, Object> options;
+
+    @Override
+    public String toString() {
+        return "ApiRequest{" +
+                "action='" + action + '\'' +
+                ", command='" + command + '\'' +
+                ", requestId='" + requestId + '\'' +
+                ", sessionId='" + sessionId + '\'' +
+                ", consumerId='" + consumerId + '\'' +
+                ", timeout=" + timeout +
+                ", options=" + options +
+                '}';
+    }
+
+    public String getAction() {
+        return action;
+    }
+
+    public void setAction(String action) {
+        this.action = action;
+    }
+
+    public String getCommand() {
+        return command;
+    }
+
+    public void setCommand(String command) {
+        this.command = command;
+    }
+
+    public Map<String, Object> getOptions() {
+        return options;
+    }
+
+    public void setOptions(Map<String, Object> options) {
+        this.options = options;
+    }
+
+    public String getRequestId() {
+        return requestId;
+    }
+
+    public void setRequestId(String requestId) {
+        this.requestId = requestId;
+    }
+
+    public String getSessionId() {
+        return sessionId;
+    }
+
+    public void setSessionId(String sessionId) {
+        this.sessionId = sessionId;
+    }
+
+    public String getConsumerId() {
+        return consumerId;
+    }
+
+    public void setConsumerId(String consumerId) {
+        this.consumerId = consumerId;
+    }
+
+    public Integer getTimeout() {
+        return timeout;
+    }
+
+    public void setTimeout(Integer timeout) {
+        this.timeout = timeout;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiResponse.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiResponse.java
new file mode 100644
index 000000000..e0d16a518
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiResponse.java
@@ -0,0 +1,79 @@
+package com.taobao.arthas.core.shell.term.impl.http.api;
+
+/**
+ * Http Api exception
+ * @author gongdewei 2020-03-19
+ */
+public class ApiResponse<T> {
+    private String requestId;
+    private ApiState state;
+    private String message;
+    private String sessionId;
+    private String consumerId;
+    private String jobId;
+    private T body;
+
+    public String getRequestId() {
+        return requestId;
+    }
+
+    public ApiResponse<T> setRequestId(String requestId) {
+        this.requestId = requestId;
+        return this;
+    }
+
+    public ApiState getState() {
+        return state;
+    }
+
+    public ApiResponse<T> setState(ApiState state) {
+        this.state = state;
+        return this;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public ApiResponse<T> setMessage(String message) {
+        this.message = message;
+        return this;
+    }
+
+    public String getSessionId() {
+        return sessionId;
+    }
+
+    public ApiResponse<T> setSessionId(String sessionId) {
+        this.sessionId = sessionId;
+        return this;
+    }
+
+    public String getConsumerId() {
+        return consumerId;
+    }
+
+    public ApiResponse<T> setConsumerId(String consumerId) {
+        this.consumerId = consumerId;
+        return this;
+    }
+
+    public String getJobId() {
+        return jobId;
+    }
+
+    public ApiResponse<T> setJobId(String jobId) {
+        this.jobId = jobId;
+        return this;
+    }
+
+    public T getBody() {
+        return body;
+    }
+
+    public ApiResponse<T> setBody(T body) {
+        this.body = body;
+        return this;
+    }
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiState.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiState.java
new file mode 100644
index 000000000..e222bf50e
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/ApiState.java
@@ -0,0 +1,35 @@
+package com.taobao.arthas.core.shell.term.impl.http.api;
+
+/**
+ * Http API response state
+ *
+ * @author gongdewei 2020-03-19
+ */
+public enum ApiState {
+    /**
+     * Scheduled async exec job
+     */
+    SCHEDULED,
+
+//    RUNNING,
+
+    /**
+     * Request processed successfully
+     */
+    SUCCEEDED,
+
+    /**
+     * Request processing interrupt
+     */
+    INTERRUPTED,
+
+    /**
+     * Request processing failed
+     */
+    FAILED,
+
+    /**
+     * Request is refused
+     */
+    REFUSED
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/HttpApiHandler.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/HttpApiHandler.java
new file mode 100644
index 000000000..2b7b1f819
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/http/api/HttpApiHandler.java
@@ -0,0 +1,708 @@
+package com.taobao.arthas.core.shell.term.impl.http.api;
+
+import com.alibaba.arthas.deps.org.slf4j.Logger;
+import com.alibaba.arthas.deps.org.slf4j.LoggerFactory;
+import com.alibaba.fastjson.JSON;
+import com.taobao.arthas.common.PidUtils;
+import com.taobao.arthas.core.command.model.*;
+import com.taobao.arthas.core.distribution.PackingResultDistributor;
+import com.taobao.arthas.core.distribution.ResultConsumer;
+import com.taobao.arthas.core.distribution.ResultDistributor;
+import com.taobao.arthas.core.distribution.impl.PackingResultDistributorImpl;
+import com.taobao.arthas.core.distribution.impl.ResultConsumerImpl;
+import com.taobao.arthas.core.server.ArthasBootstrap;
+import com.taobao.arthas.core.shell.cli.CliToken;
+import com.taobao.arthas.core.shell.cli.CliTokens;
+import com.taobao.arthas.core.shell.cli.Completion;
+import com.taobao.arthas.core.shell.handlers.Handler;
+import com.taobao.arthas.core.shell.history.HistoryManager;
+import com.taobao.arthas.core.shell.history.impl.HistoryManagerImpl;
+import com.taobao.arthas.core.shell.session.Session;
+import com.taobao.arthas.core.shell.session.SessionManager;
+import com.taobao.arthas.core.shell.system.Job;
+import com.taobao.arthas.core.shell.system.JobController;
+import com.taobao.arthas.core.shell.system.JobListener;
+import com.taobao.arthas.core.shell.system.impl.InternalCommandManager;
+import com.taobao.arthas.core.shell.term.SignalHandler;
+import com.taobao.arthas.core.shell.term.Term;
+import com.taobao.arthas.core.util.ArthasBanner;
+import com.taobao.arthas.core.util.DateUtils;
+import com.taobao.arthas.core.util.JsonUtils;
+import com.taobao.arthas.core.util.StringUtils;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufOutputStream;
+import io.netty.buffer.Unpooled;
+import io.netty.handler.codec.http.*;
+import io.netty.util.CharsetUtil;
+import io.termd.core.function.Function;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+
+/**
+ * Http Restful Api Handler
+ *
+ * @author gongdewei 2020-03-18
+ */
+public class HttpApiHandler {
+
+    private static final Logger logger = LoggerFactory.getLogger(HttpApiHandler.class);
+    public static final int DEFAULT_EXEC_TIMEOUT = 30000;
+    private final SessionManager sessionManager;
+    private final AtomicInteger requestIdGenerator = new AtomicInteger(0);
+    private static HttpApiHandler instance;
+    private final InternalCommandManager commandManager;
+    private final JobController jobController;
+    private final HistoryManager historyManager;
+
+    private int jsonBufferSize = 1024 * 256;
+    private int poolSize = 8;
+    private ArrayBlockingQueue<ByteBuf> byteBufPool = new ArrayBlockingQueue<ByteBuf>(poolSize);
+    private ArrayBlockingQueue<char[]> charsBufPool = new ArrayBlockingQueue<char[]>(poolSize);
+    private ArrayBlockingQueue<byte[]> bytesPool = new ArrayBlockingQueue<byte[]>(poolSize);
+
+    public static HttpApiHandler getInstance() {
+        if (instance == null) {
+            synchronized (HttpApiHandler.class) {
+                instance = new HttpApiHandler();
+            }
+        }
+        return instance;
+    }
+
+    private HttpApiHandler() {
+        sessionManager = ArthasBootstrap.getInstance().getSessionManager();
+        commandManager = sessionManager.getCommandManager();
+        jobController = sessionManager.getJobController();
+        historyManager = HistoryManagerImpl.getInstance();
+
+        //init buf pool
+        JsonUtils.setSerializeWriterBufferThreshold(jsonBufferSize);
+        for (int i = 0; i < poolSize; i++) {
+            byteBufPool.offer(Unpooled.buffer(jsonBufferSize));
+            charsBufPool.offer(new char[jsonBufferSize]);
+            bytesPool.offer(new byte[jsonBufferSize]);
+        }
+    }
+
+    public HttpResponse handle(FullHttpRequest request) throws Exception {
+
+        ApiResponse result;
+        String requestBody = null;
+        String requestId = "req_" + requestIdGenerator.addAndGet(1);
+        try {
+            HttpMethod method = request.method();
+            if (HttpMethod.POST.equals(method)) {
+                requestBody = getBody(request);
+                ApiRequest apiRequest = parseRequest(requestBody);
+                apiRequest.setRequestId(requestId);
+                result = processRequest(apiRequest);
+            } else {
+                result = createResponse(ApiState.REFUSED, "Unsupported http method: " + method.name());
+            }
+        } catch (Throwable e) {
+            result = createResponse(ApiState.FAILED, "Process request error: " + e.getMessage());
+            logger.error("arthas process http api request error: " + request.uri() + ", request body: " + requestBody, e);
+        }
+        if (result == null) {
+            result = createResponse(ApiState.FAILED, "The request was not processed");
+        }
+        result.setRequestId(requestId);
+
+
+        //http response content
+        ByteBuf content = null;
+        //fastjson buf
+        char[] charsBuf = null;
+        byte[] bytesBuf = null;
+
+        try {
+            //apply response content buf first
+            content = byteBufPool.poll(2000, TimeUnit.MILLISECONDS);
+            if (content == null) {
+                throw new ApiException("get response content buf failure");
+            }
+
+            //apply fastjson buf from pool
+            charsBuf = charsBufPool.poll();
+            bytesBuf = bytesPool.poll();
+            if (charsBuf == null || bytesBuf == null) {
+                throw new ApiException("get json buf failure");
+            }
+            JsonUtils.setSerializeWriterBufThreadLocal(charsBuf, bytesBuf);
+
+            //create http response
+            DefaultFullHttpResponse response = new DefaultFullHttpResponse(request.protocolVersion(),
+                    HttpResponseStatus.OK, content.retain());
+            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "application/json; charset=utf-8");
+            writeResult(response, result);
+            return response;
+        } catch (Exception e) {
+            //response is discarded
+            if (content != null) {
+                content.release();
+                byteBufPool.offer(content);
+            }
+            throw e;
+        } finally {
+            //give back json buf to pool
+            JsonUtils.setSerializeWriterBufThreadLocal(null, null);
+            if (charsBuf != null) {
+                charsBufPool.offer(charsBuf);
+            }
+            if (bytesBuf != null) {
+                bytesPool.offer(bytesBuf);
+            }
+        }
+    }
+
+    public void onCompleted(DefaultFullHttpResponse httpResponse) {
+        ByteBuf content = httpResponse.content();
+        content.clear();
+        if (content.capacity() == jsonBufferSize) {
+            if (!byteBufPool.offer(content)) {
+                content.release();
+            }
+        } else {
+            //replace content ByteBuf
+            content.release();
+            if (byteBufPool.remainingCapacity() > 0) {
+                byteBufPool.offer(Unpooled.buffer(jsonBufferSize));
+            }
+        }
+    }
+
+    private void writeResult(DefaultFullHttpResponse response, Object result) throws IOException {
+        ByteBufOutputStream out = new ByteBufOutputStream(response.content());
+        try {
+            JSON.writeJSONString(out, result);
+        } catch (IOException e) {
+            logger.error("write json to response failed", e);
+            throw e;
+        }
+    }
+
+    private ApiRequest parseRequest(String requestBody) throws ApiException {
+        if (StringUtils.isBlank(requestBody)) {
+            throw new ApiException("parse request failed: request body is empty");
+        }
+        try {
+            //ObjectMapper objectMapper = new ObjectMapper();
+            //return objectMapper.readValue(requestBody, ApiRequest.class);
+            return JSON.parseObject(requestBody, ApiRequest.class);
+        } catch (Exception e) {
+            throw new ApiException("parse request failed: " + e.getMessage(), e);
+        }
+    }
+
+    private ApiResponse processRequest(ApiRequest apiRequest) {
+
+        String actionStr = apiRequest.getAction();
+        try {
+            if (StringUtils.isBlank(actionStr)) {
+                throw new ApiException("'action' is required");
+            }
+            ApiAction action;
+            try {
+                action = ApiAction.valueOf(actionStr.trim().toUpperCase());
+            } catch (IllegalArgumentException e) {
+                throw new ApiException("unknown action: " + actionStr);
+            }
+
+            //no session required
+            if (ApiAction.INIT_SESSION.equals(action)) {
+                return processInitSessionRequest(apiRequest);
+            }
+
+            //required session
+            String sessionId = apiRequest.getSessionId();
+            if (StringUtils.isBlank(sessionId)) {
+                throw new ApiException("'sessionId' is required");
+            }
+            Session session = sessionManager.getSession(sessionId);
+            if (session == null) {
+                throw new ApiException("session not found: " + sessionId);
+            }
+            sessionManager.updateAccessTime(session);
+
+            //dispatch requests
+            ApiResponse response = dispatchRequest(action, apiRequest, session);
+            if (response != null) {
+                return response;
+            }
+
+        } catch (ApiException e) {
+            logger.info("process http api request failed: {}", e.getMessage());
+            return createResponse(ApiState.FAILED, e.getMessage());
+        } catch (Throwable e) {
+            logger.error("process http api request failed: " + e.getMessage(), e);
+            return createResponse(ApiState.FAILED, "process http api request failed: " + e.getMessage());
+        }
+
+        return createResponse(ApiState.REFUSED, "Unsupported action: " + actionStr);
+    }
+
+    private ApiResponse dispatchRequest(ApiAction action, ApiRequest apiRequest, Session session) throws ApiException {
+        switch (action) {
+            case EXEC:
+                return processExecRequest(apiRequest, session);
+            case ASYNC_EXEC:
+                return processAsyncExecRequest(apiRequest, session);
+            case INTERRUPT_JOB:
+                return processInterruptJob(apiRequest, session);
+            case PULL_RESULTS:
+                return processPullResultsRequest(apiRequest, session);
+            case SESSION_INFO:
+                return processSessionInfoRequest(apiRequest, session);
+            case JOIN_SESSION:
+                return processJoinSessionRequest(apiRequest, session);
+            case CLOSE_SESSION:
+                return processCloseSessionRequest(apiRequest, session);
+            case INIT_SESSION:
+                break;
+        }
+        return null;
+    }
+
+    private ApiResponse processInitSessionRequest(ApiRequest apiRequest) throws ApiException {
+        ApiResponse response = new ApiResponse();
+
+        //create session
+        Session session = sessionManager.createSession();
+        if (session != null) {
+
+            //create consumer
+            ResultConsumer resultConsumer = new ResultConsumerImpl();
+            session.getResultDistributor().addConsumer(resultConsumer);
+
+            session.getResultDistributor().appendResult(new MessageModel("Welcome to arthas!"));
+
+            //welcome message
+            WelcomeModel welcomeModel = new WelcomeModel();
+            welcomeModel.setVersion(ArthasBanner.version());
+            welcomeModel.setWiki(ArthasBanner.wiki());
+            welcomeModel.setTutorials(ArthasBanner.tutorials());
+            welcomeModel.setPid(PidUtils.currentPid());
+            welcomeModel.setTime(DateUtils.getCurrentDate());
+            session.getResultDistributor().appendResult(welcomeModel);
+
+            //allow input
+            updateSessionInputStatus(session, InputStatus.ALLOW_INPUT);
+
+            response.setSessionId(session.getSessionId())
+                    .setConsumerId(resultConsumer.getConsumerId())
+                    .setState(ApiState.SUCCEEDED);
+        } else {
+            throw new ApiException("create api session failed");
+        }
+        return response;
+    }
+
+    /**
+     * Update session input status for all consumer
+     *
+     * @param session
+     * @param inputStatus
+     */
+    private void updateSessionInputStatus(Session session, InputStatus inputStatus) {
+        session.getResultDistributor().appendResult(new InputStatusModel(inputStatus));
+    }
+
+    private ApiResponse processJoinSessionRequest(ApiRequest apiRequest, Session session) {
+
+        //create consumer
+        ResultConsumer resultConsumer = new ResultConsumerImpl();
+        //disable input and interrupt
+        resultConsumer.appendResult(new InputStatusModel(InputStatus.DISABLED));
+        session.getResultDistributor().addConsumer(resultConsumer);
+
+        ApiResponse response = new ApiResponse();
+        response.setSessionId(session.getSessionId())
+                .setConsumerId(resultConsumer.getConsumerId())
+                .setState(ApiState.SUCCEEDED);
+        return response;
+    }
+
+    private ApiResponse processSessionInfoRequest(ApiRequest apiRequest, Session session) {
+        ApiResponse response = new ApiResponse();
+        Map<String, Object> body = new TreeMap<String, Object>();
+        body.put("pid", session.getPid());
+        body.put("createTime", session.getCreateTime());
+        body.put("lastAccessTime", session.getLastAccessTime());
+
+        response.setState(ApiState.SUCCEEDED)
+                .setSessionId(session.getSessionId())
+                //.setConsumerId(consumerId)
+                .setBody(body);
+        return response;
+    }
+
+    private ApiResponse processCloseSessionRequest(ApiRequest apiRequest, Session session) {
+        sessionManager.removeSession(session.getSessionId());
+        ApiResponse response = new ApiResponse();
+        response.setState(ApiState.SUCCEEDED);
+        return response;
+    }
+
+    /**
+     * Execute command sync, wait for job finish or timeout, sending results immediately
+     *
+     * @param apiRequest
+     * @param session
+     * @return
+     */
+    private ApiResponse processExecRequest(ApiRequest apiRequest, Session session) {
+        String commandLine = apiRequest.getCommand();
+        Map<String, Object> body = new TreeMap<String, Object>();
+        body.put("command", commandLine);
+
+        ApiResponse response = new ApiResponse();
+        response.setSessionId(session.getSessionId())
+                .setBody(body);
+
+        if (!session.tryLock()) {
+            response.setState(ApiState.REFUSED)
+                    .setMessage("Another command is executing.");
+            return response;
+        }
+
+        int lock = session.getLock();
+        PackingResultDistributor packingResultDistributor = null;
+        Job job = null;
+        try {
+            Job foregroundJob = session.getForegroundJob();
+            if (foregroundJob != null) {
+                response.setState(ApiState.REFUSED)
+                        .setMessage("Another job is running.");
+                logger.info("Another job is running, jobId: {}", foregroundJob.id());
+                return response;
+            }
+
+            //distribute result message both to origin session channel and request channel by CompositeResultDistributor
+            packingResultDistributor = new PackingResultDistributorImpl(session);
+            //ResultDistributor resultDistributor = new CompositeResultDistributorImpl(packingResultDistributor, session.getResultDistributor());
+            job = this.createJob(commandLine, session, packingResultDistributor);
+            session.setForegroundJob(job);
+            updateSessionInputStatus(session, InputStatus.ALLOW_INTERRUPT);
+
+            job.run();
+
+        } catch (Throwable e) {
+            logger.error("Exec command failed:" + e.getMessage() + ", command:" + commandLine, e);
+            response.setState(ApiState.FAILED).setMessage("Exec command failed:" + e.getMessage());
+            return response;
+        } finally {
+            if (session.getLock() == lock) {
+                session.unLock();
+            }
+        }
+
+        //wait for job completed or timeout
+        Integer timeout = apiRequest.getTimeout();
+        if (timeout == null || timeout <= 0) {
+            timeout = DEFAULT_EXEC_TIMEOUT;
+        }
+        boolean timeExpired = !waitForJob(job, timeout);
+        if (timeExpired) {
+            logger.warn("Job is exceeded time limit, force interrupt it, jobId: {}", job.id());
+            job.interrupt();
+            response.setState(ApiState.INTERRUPTED).setMessage("The job is exceeded time limit, force interrupt");
+        } else {
+            response.setState(ApiState.SUCCEEDED);
+        }
+
+        //packing results
+        body.put("jobId", job.id());
+        body.put("jobStatus", job.status());
+        body.put("timeExpired", timeExpired);
+        if (timeExpired) {
+            body.put("timeout", timeout);
+        }
+        body.put("results", packingResultDistributor.getResults());
+
+        response.setSessionId(session.getSessionId())
+                //.setConsumerId(consumerId)
+                .setBody(body);
+        return response;
+    }
+
+    /**
+     * Execute command async, create and schedule the job running, but no wait for the results.
+     *
+     * @param apiRequest
+     * @param session
+     * @return
+     */
+    private ApiResponse processAsyncExecRequest(ApiRequest apiRequest, Session session) {
+        String commandLine = apiRequest.getCommand();
+        Map<String, Object> body = new TreeMap<String, Object>();
+        body.put("command", commandLine);
+
+        ApiResponse response = new ApiResponse();
+        response.setSessionId(session.getSessionId())
+                .setBody(body);
+
+        if (!session.tryLock()) {
+            response.setState(ApiState.REFUSED)
+                    .setMessage("Another command is executing.");
+            return response;
+        }
+        int lock = session.getLock();
+        try {
+
+            Job foregroundJob = session.getForegroundJob();
+            if (foregroundJob != null) {
+                response.setState(ApiState.REFUSED)
+                        .setMessage("Another job is running.");
+                logger.info("Another job is running, jobId: {}", foregroundJob.id());
+                return response;
+            }
+
+            //create job
+            Job job = this.createJob(commandLine, session, session.getResultDistributor());
+            body.put("jobId", job.id());
+            body.put("jobStatus", job.status());
+            response.setState(ApiState.SCHEDULED);
+
+            //add command before exec job
+            CommandRequestModel commandRequestModel = new CommandRequestModel(commandLine, response.getState());
+            commandRequestModel.setJobId(job.id());
+            session.getResultDistributor().appendResult(commandRequestModel);
+            session.setForegroundJob(job);
+            updateSessionInputStatus(session, InputStatus.ALLOW_INTERRUPT);
+
+            //run job
+            job.run();
+
+            return response;
+        } catch (Throwable e) {
+            logger.error("Async exec command failed:" + e.getMessage() + ", command:" + commandLine, e);
+            response.setState(ApiState.FAILED).setMessage("Async exec command failed:" + e.getMessage());
+            CommandRequestModel commandRequestModel = new CommandRequestModel(commandLine, response.getState(), response.getMessage());
+            session.getResultDistributor().appendResult(commandRequestModel);
+            return response;
+        } finally {
+            if (session.getLock() == lock) {
+                session.unLock();
+            }
+        }
+    }
+
+    private ApiResponse processInterruptJob(ApiRequest apiRequest, Session session) {
+        Job job = session.getForegroundJob();
+        if (job == null) {
+            return new ApiResponse().setState(ApiState.FAILED).setMessage("no foreground job is running");
+        }
+        job.interrupt();
+
+        Map<String, Object> body = new TreeMap<String, Object>();
+        body.put("jobId", job.id());
+        body.put("jobStatus", job.status());
+        return new ApiResponse()
+                .setState(ApiState.SUCCEEDED)
+                .setBody(body);
+    }
+
+    /**
+     * Pull results from result queue
+     *
+     * @param apiRequest
+     * @param session
+     * @return
+     */
+    private ApiResponse processPullResultsRequest(ApiRequest apiRequest, Session session) throws ApiException {
+        String consumerId = apiRequest.getConsumerId();
+        if (StringUtils.isBlank(consumerId)) {
+            throw new ApiException("'consumerId' is required");
+        }
+        ResultConsumer consumer = session.getResultDistributor().getConsumer(consumerId);
+        if (consumer == null) {
+            throw new ApiException("consumer not found: " + consumerId);
+        }
+
+        List<ResultModel> results = consumer.pollResults();
+        Map<String, Object> body = new TreeMap<String, Object>();
+        body.put("results", results);
+
+        ApiResponse response = new ApiResponse();
+        response.setState(ApiState.SUCCEEDED)
+                .setSessionId(session.getSessionId())
+                .setConsumerId(consumerId)
+                .setBody(body);
+        return response;
+    }
+
+    private boolean waitForJob(Job job, int timeout) {
+        long startTime = System.currentTimeMillis();
+        while (true) {
+            switch (job.status()) {
+                case STOPPED:
+                case TERMINATED:
+                    return true;
+            }
+            if (System.currentTimeMillis() - startTime > timeout) {
+                return false;
+            }
+            try {
+                Thread.sleep(100);
+            } catch (InterruptedException e) {
+            }
+        }
+    }
+
+    private synchronized Job createJob(List<CliToken> args, Session session, ResultDistributor resultDistributor) {
+        Job job = jobController.createJob(commandManager, args, session, new ApiJobHandler(session), new ApiTerm(session), resultDistributor);
+        return job;
+    }
+
+    private Job createJob(String line, Session session, ResultDistributor resultDistributor) {
+        historyManager.addHistory(line);
+        historyManager.saveHistory();
+        return createJob(CliTokens.tokenize(line), session, resultDistributor);
+    }
+
+    private ApiResponse createResponse(ApiState apiState, String message) {
+        ApiResponse apiResponse = new ApiResponse();
+        apiResponse.setState(apiState);
+        apiResponse.setMessage(message);
+        return apiResponse;
+    }
+
+    private String getBody(FullHttpRequest request) {
+        ByteBuf buf = request.content();
+        return buf.toString(CharsetUtil.UTF_8);
+    }
+
+    private class ApiJobHandler implements JobListener {
+
+        private Session session;
+
+        public ApiJobHandler(Session session) {
+            this.session = session;
+        }
+
+        @Override
+        public void onForeground(Job job) {
+            session.setForegroundJob(job);
+        }
+
+        @Override
+        public void onBackground(Job job) {
+            if (session.getForegroundJob() == job) {
+                session.setForegroundJob(null);
+                updateSessionInputStatus(session, InputStatus.ALLOW_INPUT);
+            }
+        }
+
+        @Override
+        public void onTerminated(Job job) {
+            if (session.getForegroundJob() == job) {
+                session.setForegroundJob(null);
+                updateSessionInputStatus(session, InputStatus.ALLOW_INPUT);
+            }
+        }
+
+        @Override
+        public void onSuspend(Job job) {
+            if (session.getForegroundJob() == job) {
+                session.setForegroundJob(null);
+                updateSessionInputStatus(session, InputStatus.ALLOW_INPUT);
+            }
+        }
+    }
+
+    private class ApiTerm implements Term {
+
+        private Session session;
+
+        public ApiTerm(Session session) {
+            this.session = session;
+        }
+
+        @Override
+        public Term resizehandler(Handler<Void> handler) {
+            return this;
+        }
+
+        @Override
+        public String type() {
+            return "web";
+        }
+
+        @Override
+        public int width() {
+            return 1000;
+        }
+
+        @Override
+        public int height() {
+            return 200;
+        }
+
+        @Override
+        public Term stdinHandler(Handler<String> handler) {
+            return this;
+        }
+
+        @Override
+        public Term stdoutHandler(Function<String, String> handler) {
+            return this;
+        }
+
+        @Override
+        public Term write(String data) {
+            return this;
+        }
+
+        @Override
+        public long lastAccessedTime() {
+            return session.getLastAccessTime();
+        }
+
+        @Override
+        public Term echo(String text) {
+            return this;
+        }
+
+        @Override
+        public Term setSession(Session session) {
+            return this;
+        }
+
+        @Override
+        public Term interruptHandler(SignalHandler handler) {
+            return this;
+        }
+
+        @Override
+        public Term suspendHandler(SignalHandler handler) {
+            return this;
+        }
+
+        @Override
+        public void readline(String prompt, Handler<String> lineHandler) {
+
+        }
+
+        @Override
+        public void readline(String prompt, Handler<String> lineHandler, Handler<Completion> completionHandler) {
+
+        }
+
+        @Override
+        public Term closeHandler(Handler<Void> handler) {
+            return this;
+        }
+
+        @Override
+        public void close() {
+
+        }
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/HttpTelnetTermServer.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/HttpTelnetTermServer.java
index 3bc6c5b66..f7de93789 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/HttpTelnetTermServer.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/HttpTelnetTermServer.java
@@ -11,6 +11,7 @@ import com.taobao.arthas.core.shell.term.TermServer;
 import com.taobao.arthas.core.shell.term.impl.Helper;
 import com.taobao.arthas.core.shell.term.impl.TermImpl;
 
+import io.netty.util.concurrent.EventExecutorGroup;
 import io.termd.core.function.Consumer;
 import io.termd.core.tty.TtyConnection;
 
@@ -29,11 +30,13 @@ public class HttpTelnetTermServer extends TermServer {
     private String hostIp;
     private int port;
     private long connectionTimeout;
+    private EventExecutorGroup workerGroup;
 
-    public HttpTelnetTermServer(String hostIp, int port, long connectionTimeout) {
+    public HttpTelnetTermServer(String hostIp, int port, long connectionTimeout, EventExecutorGroup workerGroup) {
         this.hostIp = hostIp;
         this.port = port;
         this.connectionTimeout = connectionTimeout;
+        this.workerGroup = workerGroup;
     }
 
     @Override
@@ -45,7 +48,7 @@ public class HttpTelnetTermServer extends TermServer {
     @Override
     public TermServer listen(Handler<Future<TermServer>> listenHandler) {
         // TODO: charset and inputrc from options
-        bootstrap = new NettyHttpTelnetTtyBootstrap().setHost(hostIp).setPort(port);
+        bootstrap = new NettyHttpTelnetTtyBootstrap(workerGroup).setHost(hostIp).setPort(port);
         try {
             bootstrap.start(new Consumer<TtyConnection>() {
                 @Override
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/NettyHttpTelnetBootstrap.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/NettyHttpTelnetBootstrap.java
index b289582f5..a538e3266 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/NettyHttpTelnetBootstrap.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/NettyHttpTelnetBootstrap.java
@@ -11,6 +11,7 @@ import io.netty.channel.socket.SocketChannel;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.handler.logging.LogLevel;
 import io.netty.handler.logging.LoggingHandler;
+import io.netty.util.concurrent.EventExecutorGroup;
 import io.netty.util.concurrent.Future;
 import io.netty.util.concurrent.GenericFutureListener;
 import io.netty.util.concurrent.ImmediateEventExecutor;
@@ -28,8 +29,10 @@ public class NettyHttpTelnetBootstrap extends TelnetBootstrap {
 
     private EventLoopGroup group;
     private ChannelGroup channelGroup;
+    private EventExecutorGroup workerGroup;
 
-    public NettyHttpTelnetBootstrap() {
+    public NettyHttpTelnetBootstrap(EventExecutorGroup workerGroup) {
+        this.workerGroup = workerGroup;
         this.group = new NioEventLoopGroup();
         this.channelGroup = new DefaultChannelGroup(ImmediateEventExecutor.INSTANCE);
     }
@@ -56,7 +59,7 @@ public class NettyHttpTelnetBootstrap extends TelnetBootstrap {
                         .childHandler(new ChannelInitializer<SocketChannel>() {
                             @Override
                             public void initChannel(SocketChannel ch) throws Exception {
-                                ch.pipeline().addLast(new ProtocolDetectHandler(channelGroup, handlerFactory, factory));
+                                ch.pipeline().addLast(new ProtocolDetectHandler(channelGroup, handlerFactory, factory, workerGroup));
                             }
                         });
 
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/NettyHttpTelnetTtyBootstrap.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/NettyHttpTelnetTtyBootstrap.java
index 100c003f4..05a7ec08a 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/NettyHttpTelnetTtyBootstrap.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/NettyHttpTelnetTtyBootstrap.java
@@ -2,6 +2,7 @@ package com.taobao.arthas.core.shell.term.impl.httptelnet;
 
 import java.nio.charset.Charset;
 
+import io.netty.util.concurrent.EventExecutorGroup;
 import io.termd.core.function.Consumer;
 import io.termd.core.function.Supplier;
 import io.termd.core.telnet.TelnetHandler;
@@ -21,8 +22,8 @@ public class NettyHttpTelnetTtyBootstrap {
     private boolean inBinary;
     private Charset charset = Charset.forName("UTF-8");
 
-    public NettyHttpTelnetTtyBootstrap() {
-        this.httpTelnetTtyBootstrap = new NettyHttpTelnetBootstrap();
+    public NettyHttpTelnetTtyBootstrap(EventExecutorGroup workerGroup) {
+        this.httpTelnetTtyBootstrap = new NettyHttpTelnetBootstrap(workerGroup);
     }
 
     public String getHost() {
diff --git a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/ProtocolDetectHandler.java b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/ProtocolDetectHandler.java
index 4ca8ea6f5..8113ef9fc 100644
--- a/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/ProtocolDetectHandler.java
+++ b/core/src/main/java/com/taobao/arthas/core/shell/term/impl/httptelnet/ProtocolDetectHandler.java
@@ -4,8 +4,8 @@ import java.io.File;
 import java.util.concurrent.TimeUnit;
 
 import com.taobao.arthas.core.shell.term.impl.http.HttpRequestHandler;
-import com.taobao.arthas.core.shell.term.impl.http.TtyWebSocketFrameHandler;
 
+import com.taobao.arthas.core.shell.term.impl.http.TtyWebSocketFrameHandler;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
@@ -15,6 +15,7 @@ import io.netty.handler.codec.http.HttpObjectAggregator;
 import io.netty.handler.codec.http.HttpServerCodec;
 import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
 import io.netty.handler.stream.ChunkedWriteHandler;
+import io.netty.util.concurrent.EventExecutorGroup;
 import io.netty.util.concurrent.ScheduledFuture;
 import io.termd.core.function.Consumer;
 import io.termd.core.function.Supplier;
@@ -31,12 +32,14 @@ public class ProtocolDetectHandler extends ChannelInboundHandlerAdapter {
     private ChannelGroup channelGroup;
     private Supplier<TelnetHandler> handlerFactory;
     private Consumer<TtyConnection> ttyConnectionFactory;
+    private EventExecutorGroup workerGroup;
 
     public ProtocolDetectHandler(ChannelGroup channelGroup, final Supplier<TelnetHandler> handlerFactory,
-            Consumer<TtyConnection> ttyConnectionFactory) {
+                                 Consumer<TtyConnection> ttyConnectionFactory, EventExecutorGroup workerGroup) {
         this.channelGroup = channelGroup;
         this.handlerFactory = handlerFactory;
         this.ttyConnectionFactory = ttyConnectionFactory;
+        this.workerGroup = workerGroup;
     }
 
     private ScheduledFuture<?> detectTelnetFuture;
@@ -82,7 +85,7 @@ public class ProtocolDetectHandler extends ChannelInboundHandlerAdapter {
             pipeline.addLast(new HttpServerCodec());
             pipeline.addLast(new ChunkedWriteHandler());
             pipeline.addLast(new HttpObjectAggregator(64 * 1024));
-            pipeline.addLast(new HttpRequestHandler("/ws", new File("arthas-output")));
+            pipeline.addLast(workerGroup, "HttpRequestHandler", new HttpRequestHandler("/ws", new File("arthas-output")));
             pipeline.addLast(new WebSocketServerProtocolHandler("/ws"));
             pipeline.addLast(new TtyWebSocketFrameHandler(channelGroup, ttyConnectionFactory));
             ctx.fireChannelActive();
diff --git a/core/src/main/java/com/taobao/arthas/core/util/FileUtils.java b/core/src/main/java/com/taobao/arthas/core/util/FileUtils.java
index 973acc23e..c2aba4ad7 100644
--- a/core/src/main/java/com/taobao/arthas/core/util/FileUtils.java
+++ b/core/src/main/java/com/taobao/arthas/core/util/FileUtils.java
@@ -148,6 +148,55 @@ public class FileUtils {
         return history;
     }
 
+    /**
+     * save the command history to the given file, data will be overridden.
+     * @param history the command history
+     * @param file the file to save the history
+     */
+    public static void saveCommandHistoryString(List<String> history, File file) {
+        OutputStream out = null;
+        try {
+            out = new BufferedOutputStream(openOutputStream(file, false));
+            for (String command: history) {
+                out.write(command.getBytes("utf-8"));
+                out.write('\n');
+            }
+        } catch (IOException e) {
+            // ignore
+        } finally {
+            try {
+                if (out != null) {
+                    out.close();
+                }
+            } catch (IOException ioe) {
+                // ignore
+            }
+        }
+    }
+
+    public static List<String> loadCommandHistoryString(File file) {
+        BufferedReader br = null;
+        List<String> history = new ArrayList<String>();
+        try {
+            br = new BufferedReader(new InputStreamReader(new FileInputStream(file), "utf-8"));
+            String line;
+            while ((line = br.readLine()) != null) {
+                history.add(line);
+            }
+        } catch (IOException e) {
+            // ignore
+        } finally {
+            try {
+                if (br != null) {
+                    br.close();
+                }
+            } catch (IOException ioe) {
+                // ignore
+            }
+        }
+        return history;
+    }
+
     public static String readFileToString(File file, Charset encoding) throws IOException {
         FileInputStream stream = new FileInputStream(file);
         try {
diff --git a/core/src/main/java/com/taobao/arthas/core/util/HttpUtils.java b/core/src/main/java/com/taobao/arthas/core/util/HttpUtils.java
new file mode 100644
index 000000000..5d8fdca8b
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/util/HttpUtils.java
@@ -0,0 +1,60 @@
+package com.taobao.arthas.core.util;
+
+import io.netty.handler.codec.http.*;
+import io.netty.handler.codec.http.cookie.Cookie;
+import io.netty.handler.codec.http.cookie.ServerCookieEncoder;
+
+import java.io.UnsupportedEncodingException;
+import java.util.Set;
+
+/**
+ * @author gongdewei 2020/3/31
+ */
+public class HttpUtils {
+
+    /**
+     * Get cookie value by name
+     * @param cookies request cookies
+     * @param cookieName the cookie name
+     */
+    public static String getCookieValue(Set<Cookie> cookies, String cookieName) {
+        for (Cookie cookie : cookies) {
+            if(cookie.name().equals(cookieName)){
+                return cookie.value();
+            }
+        }
+        return null;
+    }
+
+    /**
+     *
+     * @param response
+     * @param name
+     * @param value
+     */
+    public static void setCookie(DefaultFullHttpResponse response, String name, String value) {
+        response.headers().add(HttpHeaderNames.SET_COOKIE, ServerCookieEncoder.STRICT.encode(name, value));
+    }
+
+    /**
+     * Create http response with status code and content
+     * @param request request
+     * @param status response status code
+     * @param content response content
+     */
+    public static DefaultHttpResponse createResponse(FullHttpRequest request, HttpResponseStatus status, String content) {
+        DefaultFullHttpResponse response = new DefaultFullHttpResponse(request.protocolVersion(), status);
+        response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/html; charset=utf-8");
+        try {
+            response.content().writeBytes(content.getBytes("UTF-8"));
+        } catch (UnsupportedEncodingException e) {
+        }
+        return response;
+    }
+
+    public static HttpResponse createRedirectResponse(FullHttpRequest request, String url) {
+        DefaultFullHttpResponse response = new DefaultFullHttpResponse(request.protocolVersion(), HttpResponseStatus.FOUND);
+        response.headers().set(HttpHeaderNames.LOCATION, url);
+        return response;
+    }
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/util/JsonUtils.java b/core/src/main/java/com/taobao/arthas/core/util/JsonUtils.java
new file mode 100644
index 000000000..a2b184b8b
--- /dev/null
+++ b/core/src/main/java/com/taobao/arthas/core/util/JsonUtils.java
@@ -0,0 +1,93 @@
+package com.taobao.arthas.core.util;
+
+import com.alibaba.fastjson.serializer.SerializeWriter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.lang.reflect.Field;
+
+/**
+ * @author gongdewei 2020/5/15
+ */
+public class JsonUtils {
+    private static final Logger logger = LoggerFactory.getLogger(JsonUtils.class);
+    private static Field serializeWriterBufLocalField;
+    private static Field serializeWriterBytesBufLocal;
+    private static Field serializeWriterBufferThreshold;
+
+    /**
+     * Set Fastjson SerializeWriter Buffer Threshold
+     * @param value
+     */
+    public static void setSerializeWriterBufferThreshold(int value) {
+        Class<SerializeWriter> clazz = SerializeWriter.class;
+        try {
+            if (serializeWriterBufferThreshold == null) {
+                serializeWriterBufferThreshold = clazz.getDeclaredField("BUFFER_THRESHOLD");
+            }
+            serializeWriterBufferThreshold.setAccessible(true);
+            serializeWriterBufferThreshold.set(null, value);
+        } catch (Throwable e) {
+            logger.error("update SerializeWriter.BUFFER_THRESHOLD value failed", e);
+        }
+    }
+
+    /**
+     * Set Fastjson SerializeWriter ThreadLocal value
+     * @param bufSize
+     */
+    public static void setSerializeWriterBufThreadLocal(int bufSize) {
+        Class<SerializeWriter> clazz = SerializeWriter.class;
+        try {
+            //set threadLocal value
+            if (serializeWriterBufLocalField == null) {
+                serializeWriterBufLocalField = clazz.getDeclaredField("bufLocal");
+            }
+            serializeWriterBufLocalField.setAccessible(true);
+            ThreadLocal<char[]> bufLocal = (ThreadLocal<char[]>) serializeWriterBufLocalField.get(null);
+            char[] charsLocal = bufLocal.get();
+            if (charsLocal == null || charsLocal.length < bufSize) {
+                bufLocal.set(new char[bufSize]);
+            }
+
+            if (serializeWriterBytesBufLocal == null) {
+                serializeWriterBytesBufLocal = clazz.getDeclaredField("bytesBufLocal");
+            }
+            serializeWriterBytesBufLocal.setAccessible(true);
+            ThreadLocal<byte[]> bytesBufLocal = (ThreadLocal<byte[]>) serializeWriterBytesBufLocal.get(null);
+            byte[] bytesLocal = bytesBufLocal.get();
+            if (bytesLocal == null || bytesLocal.length < bufSize) {
+                bytesBufLocal.set(new byte[bufSize]);
+            }
+        } catch (Throwable e) {
+            logger.error("update SerializeWriter.BUFFER_THRESHOLD value failed", e);
+        }
+    }
+
+    /**
+     * Set Fastjson SerializeWriter ThreadLocal value
+     */
+    public static void setSerializeWriterBufThreadLocal(char[] charsBuf, byte[] bytesBuf) {
+        Class<SerializeWriter> clazz = SerializeWriter.class;
+        try {
+            //set threadLocal value
+            if (serializeWriterBufLocalField == null) {
+                serializeWriterBufLocalField = clazz.getDeclaredField("bufLocal");
+            }
+            serializeWriterBufLocalField.setAccessible(true);
+            ThreadLocal<char[]> bufLocal = (ThreadLocal<char[]>) serializeWriterBufLocalField.get(null);
+            bufLocal.set(charsBuf);
+
+            if (serializeWriterBytesBufLocal == null) {
+                serializeWriterBytesBufLocal = clazz.getDeclaredField("bytesBufLocal");
+            }
+            serializeWriterBytesBufLocal.setAccessible(true);
+            ThreadLocal<byte[]> bytesBufLocal = (ThreadLocal<byte[]>) serializeWriterBytesBufLocal.get(null);
+            bytesBufLocal.set(bytesBuf);
+        } catch (Throwable e) {
+            logger.error("update SerializeWriter.BUFFER_THRESHOLD value failed", e);
+        }
+    }
+
+
+}
diff --git a/core/src/main/java/com/taobao/arthas/core/util/usage/StyledUsageFormatter.java b/core/src/main/java/com/taobao/arthas/core/util/usage/StyledUsageFormatter.java
index 1e50869eb..f23b9b30d 100644
--- a/core/src/main/java/com/taobao/arthas/core/util/usage/StyledUsageFormatter.java
+++ b/core/src/main/java/com/taobao/arthas/core/util/usage/StyledUsageFormatter.java
@@ -103,7 +103,7 @@ public class StyledUsageFormatter extends UsageMessageFormatter {
         return Style.style(Decoration.bold, fontColor);
     }
 
-    private String computeUsageLine(String prefix, CLI cli) {
+    public String computeUsageLine(String prefix, CLI cli) {
         // initialise the string buffer
         StringBuilder buff;
         if (prefix == null) {