Introduced capability of configuring the daemon property on schedulers.

Also added the name property to ScheduledExecutorScheduler.

jetty-util/src/main/java/org/eclipse/jetty/util/thread/ScheduledExecutorScheduler.java

@@ -20,18 +20,49 @@ package org.eclipse.jetty.util.thread;
 
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 
 import org.eclipse.jetty.util.component.AbstractLifeCycle;
 
+/**
+ * Implementation of {@link Scheduler} based on JDK's {@link ScheduledThreadPoolExecutor}.
+ * <p />
+ * While use of {@link ScheduledThreadPoolExecutor} creates futures that will not be used,
+ * it has the advantage of allowing to set a property to remove cancelled tasks from its
+ * queue even if the task did not fire, which provides a huge benefit in the performance
+ * of garbage collection in young generation.
+ */
 public class ScheduledExecutorScheduler extends AbstractLifeCycle implements Scheduler
 {
+    private final String name;
+    private final boolean daemon;
     private volatile ScheduledThreadPoolExecutor scheduler;
 
+    public ScheduledExecutorScheduler()
+    {
+        this(null, false);
+    }
+
+    public ScheduledExecutorScheduler(String name, boolean daemon)
+    {
+        this.name = name == null ? "Scheduler-" + hashCode() : name;
+        this.daemon = daemon;
+    }
+
     @Override
     protected void doStart() throws Exception
     {
-        scheduler = new ScheduledThreadPoolExecutor(1);
+        scheduler = new ScheduledThreadPoolExecutor(1, new ThreadFactory()
+        {
+            @Override
+            public Thread newThread(Runnable r)
+            {
+                Thread thread = new Thread(r, name);
+                thread.setDaemon(daemon);
+                return thread;
+            }
+        });
         scheduler.setRemoveOnCancelPolicy(true);
         super.doStart();
     }

jetty-util/src/main/java/org/eclipse/jetty/util/thread/TimerScheduler.java

@@ -39,22 +39,24 @@ public class TimerScheduler extends AbstractLifeCycle implements Scheduler
      */
 
     private final String _name;
+    private final boolean _daemon;
     private Timer _timer;
 
     public TimerScheduler()
     {
-        this(null);
+        this(null, false);
     }
 
-    public TimerScheduler(String name)
+    public TimerScheduler(String name, boolean daemon)
     {
         _name=name;
+        _daemon=daemon;
     }
 
     @Override
     protected void doStart() throws Exception
     {
-        _timer=_name==null?new Timer():new Timer(_name);
+        _timer=_name==null?new Timer():new Timer(_name,_daemon);
         super.doStart();
     }