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Code Issues Packages Projects Releases Wiki Activity

cache split result as String[], foreach optimization

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This commit is contained in:
gongdewei
2020-05-28 12:54:17 +08:00
parent 080eabc300
commit 67dbe49009
1 changed files with 44 additions and 44 deletions
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core/src/main/java/com/taobao/arthas/core/advisor/SpyImpl.java
+44 -44
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@@ -1,7 +1,6 @@
package com.taobao.arthas.core.advisor;
import java.arthas.SpyAPI.AbstractSpy;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
@@ -25,20 +24,21 @@ import com.taobao.arthas.core.util.StringUtils;
*/
public class SpyImpl extends AbstractSpy {
private static final Logger logger = LoggerFactory.getLogger(SpyImpl.class);
private final Map<String, List<String>> splitCache = new ConcurrentHashMap<String, List<String>>();
private final Map<String, String[]> splitCache = new ConcurrentHashMap<String, String[]>();
@Override
public void atEnter(Class<?> clazz, String methodInfo, Object target, Object[] args) {
ClassLoader classLoader = clazz.getClassLoader();
List<String> strs = splitMethodInfo(methodInfo);
String methodName = strs.get(0);
String methodDesc = strs.get(1);
String[] info = splitMethodInfo(methodInfo);
String methodName = info[0];
String methodDesc = info[1];
// TODO listener 只用查一次，放到 thread local里保存起来就可以了！
List<AdviceListener> listeners = AdviceListenerManager.queryAdviceListeners(classLoader, clazz.getName(),
methodName, methodDesc);
if (listeners != null) {
for (AdviceListener adviceListener : listeners) {
for (int i = 0; i < listeners.size(); i++) {
AdviceListener adviceListener = listeners.get(i);
try {
if (skipAdviceListener(adviceListener)) {
continue;
@@ -58,14 +58,15 @@ public class SpyImpl extends AbstractSpy {
public void atExit(Class<?> clazz, String methodInfo, Object target, Object[] args, Object returnObject) {
ClassLoader classLoader = clazz.getClassLoader();
List<String> strs = splitMethodInfo(methodInfo);
String methodName = strs.get(0);
String methodDesc = strs.get(1);
String[] info = splitMethodInfo(methodInfo);
String methodName = info[0];
String methodDesc = info[1];
List<AdviceListener> listeners = AdviceListenerManager.queryAdviceListeners(classLoader, clazz.getName(),
methodName, methodDesc);
if (listeners != null) {
for (AdviceListener adviceListener : listeners) {
for (int i = 0; i < listeners.size(); i++) {
AdviceListener adviceListener = listeners.get(i);
try {
if (skipAdviceListener(adviceListener)) {
continue;
@@ -84,14 +85,15 @@ public class SpyImpl extends AbstractSpy {
public void atExceptionExit(Class<?> clazz, String methodInfo, Object target, Object[] args, Throwable throwable) {
ClassLoader classLoader = clazz.getClassLoader();
List<String> strs = splitMethodInfo(methodInfo);
String methodName = strs.get(0);
String methodDesc = strs.get(1);
String[] info = splitMethodInfo(methodInfo);
String methodName = info[0];
String methodDesc = info[1];
List<AdviceListener> listeners = AdviceListenerManager.queryAdviceListeners(classLoader, clazz.getName(),
methodName, methodDesc);
if (listeners != null) {
for (AdviceListener adviceListener : listeners) {
for (int i = 0; i < listeners.size(); i++) {
AdviceListener adviceListener = listeners.get(i);
try {
if (skipAdviceListener(adviceListener)) {
continue;
@@ -109,23 +111,23 @@ public class SpyImpl extends AbstractSpy {
@Override
public void atBeforeInvoke(Class<?> clazz, String invokeInfo, Object target) {
ClassLoader classLoader = clazz.getClassLoader();
List<String> strs = splitInvokeInfo(invokeInfo);
String owner = strs.get(0);
String methodName = strs.get(1);
String methodDesc = strs.get(2);
String[] info = splitInvokeInfo(invokeInfo);
String owner = info[0];
String methodName = info[1];
String methodDesc = info[2];
List<AdviceListener> listeners = AdviceListenerManager.queryTraceAdviceListeners(classLoader, clazz.getName(),
owner, methodName, methodDesc);
if (listeners != null) {
int lineNumber = Integer.parseInt(strs.get(3));
for (AdviceListener adviceListener : listeners) {
for (int i = 0; i < listeners.size(); i++) {
AdviceListener adviceListener = listeners.get(i);
try {
if (skipAdviceListener(adviceListener)) {
continue;
}
final InvokeTraceable listener = (InvokeTraceable) adviceListener;
listener.invokeBeforeTracing(owner, methodName, methodDesc, lineNumber);
listener.invokeBeforeTracing(owner, methodName, methodDesc, Integer.parseInt(info[3]));
} catch (Throwable e) {
if (logger.isDebugEnabled()) {
logger.error("class: {}, invokeInfo: {}", clazz.getName(), invokeInfo, e);
@@ -138,22 +140,22 @@ public class SpyImpl extends AbstractSpy {
@Override
public void atAfterInvoke(Class<?> clazz, String invokeInfo, Object target) {
ClassLoader classLoader = clazz.getClassLoader();
List<String> strs = splitInvokeInfo(invokeInfo);
String owner = strs.get(0);
String methodName = strs.get(1);
String methodDesc = strs.get(2);
String[] info = splitInvokeInfo(invokeInfo);
String owner = info[0];
String methodName = info[1];
String methodDesc = info[2];
List<AdviceListener> listeners = AdviceListenerManager.queryTraceAdviceListeners(classLoader, clazz.getName(),
owner, methodName, methodDesc);
if (listeners != null) {
int lineNumber = Integer.parseInt(strs.get(3));
for (AdviceListener adviceListener : listeners) {
for (int i = 0; i < listeners.size(); i++) {
AdviceListener adviceListener = listeners.get(i);
try {
if (skipAdviceListener(adviceListener)) {
continue;
}
final InvokeTraceable listener = (InvokeTraceable) adviceListener;
listener.invokeAfterTracing(owner, methodName, methodDesc, lineNumber);
listener.invokeAfterTracing(owner, methodName, methodDesc, Integer.parseInt(info[3]));
} catch (Throwable e) {
if (logger.isDebugEnabled()) {
logger.error("class: {}, invokeInfo: {}", clazz.getName(), invokeInfo, e);
@@ -167,23 +169,23 @@ public class SpyImpl extends AbstractSpy {
@Override
public void atInvokeException(Class<?> clazz, String invokeInfo, Object target, Throwable throwable) {
ClassLoader classLoader = clazz.getClassLoader();
List<String> strs = splitInvokeInfo(invokeInfo);
String owner = strs.get(0);
String methodName = strs.get(1);
String methodDesc = strs.get(2);
String[] info = splitInvokeInfo(invokeInfo);
String owner = info[0];
String methodName = info[1];
String methodDesc = info[2];
List<AdviceListener> listeners = AdviceListenerManager.queryTraceAdviceListeners(classLoader, clazz.getName(),
owner, methodName, methodDesc);
if (listeners != null) {
int lineNumber = Integer.parseInt(strs.get(3));
for (AdviceListener adviceListener : listeners) {
for (int i = 0; i < listeners.size(); i++) {
AdviceListener adviceListener = listeners.get(i);
try {
if (skipAdviceListener(adviceListener)) {
continue;
}
final InvokeTraceable listener = (InvokeTraceable) adviceListener;
listener.invokeThrowTracing(owner, methodName, methodDesc, lineNumber);
listener.invokeThrowTracing(owner, methodName, methodDesc, Integer.parseInt(info[3]));
} catch (Throwable e) {
if (logger.isDebugEnabled()) {
logger.error("class: {}, invokeInfo: {}", clazz.getName(), invokeInfo, e);
@@ -193,26 +195,24 @@ public class SpyImpl extends AbstractSpy {
}
}
private List<String> splitMethodInfo(String methodInfo) {
private String[] splitMethodInfo(String methodInfo) {
return splitString(methodInfo);
}
private List<String> splitInvokeInfo(String invokeInfo) {
private String[] splitInvokeInfo(String invokeInfo) {
return splitString(invokeInfo);
}
/**
* 经过优化的字符串split方法，减少产生的内存碎片。
* trace/watch 等字节码拦截回调每次都需要进行字符串split，调用很频繁，产生较多小对象。
* 注意： 返回的List为重用的缓存对象，不能直接引用它，有需要请复制一份
* 缓存字符串split结果，减少频繁调用产生的内存碎片。
* trace/watch/monitor 等字节码拦截回调每次都需要进行字符串split，如果拦截的是高频方法，回调很频繁，产生较多小对象。
* @param str
* @return
*/
private List<String> splitString(String str) {
List<String> strs = splitCache.get(str);
private String[] splitString(String str) {
String[] strs = splitCache.get(str);
if (strs == null) {
strs = new ArrayList<String>(8);
StringUtils.splitToList(str, '|', strs);
strs = StringUtils.split(str, '|');
splitCache.put(str, strs);
}
return strs;