#919 - io.ebean package initial

src/main/java/io/ebeaninternal/server/lib/DaemonThreadFactory.java

@@ -0,0 +1,49 @@
+package io.ebeaninternal.server.lib;
+
+
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * ThreadFactory for Daemon threads.
+ * <p>
+ * Daemon threads do not stop a JVM stopping. If an application only has Daemon
+ * threads left it will shutdown.
+ * </p>
+ * <p>
+ * In using Daemon threads you need to either not care about being interrupted
+ * on shutdown or register with the JVM shutdown hook to perform a nice shutdown
+ * of the daemon threads etc.
+ * </p>
+ *
+ * @author rbygrave
+ */
+public class DaemonThreadFactory implements ThreadFactory {
+
+  private static final AtomicInteger poolNumber = new AtomicInteger(1);
+
+  private final ThreadGroup group;
+
+  private final AtomicInteger threadNumber = new AtomicInteger(1);
+
+  private final String namePrefix;
+
+  public DaemonThreadFactory(String namePrefix) {
+    SecurityManager s = System.getSecurityManager();
+    this.group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
+    this.namePrefix = namePrefix != null ? namePrefix : "pool-" + poolNumber.getAndIncrement() + "-thread-";
+  }
+
+  public Thread newThread(Runnable r) {
+
+    Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
+
+    t.setDaemon(true);
+
+    if (t.getPriority() != Thread.NORM_PRIORITY) {
+      t.setPriority(Thread.NORM_PRIORITY);
+    }
+
+    return t;
+  }
+}