| // |
| // ======================================================================== |
| // Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.util.thread; |
| |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import java.util.concurrent.RejectedExecutionException; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.eclipse.jetty.util.component.AbstractLifeCycle; |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| |
| /* ------------------------------------------------------------ */ |
| /** A scheduler based on the the JVM Timer class |
| */ |
| public class TimerScheduler extends AbstractLifeCycle implements Scheduler, Runnable |
| { |
| private static final Logger LOG = Log.getLogger(TimerScheduler.class); |
| |
| /* |
| * This class uses the Timer class rather than an ScheduledExecutionService because |
| * it uses the same algorithm internally and the signature is cheaper to use as there are no |
| * Futures involved (which we do not need). |
| * However, Timer is still locking and a concurrent queue would be better. |
| */ |
| |
| private final String _name; |
| private final boolean _daemon; |
| private Timer _timer; |
| |
| public TimerScheduler() |
| { |
| this(null, false); |
| } |
| |
| public TimerScheduler(String name, boolean daemon) |
| { |
| _name = name; |
| _daemon = daemon; |
| } |
| |
| @Override |
| protected void doStart() throws Exception |
| { |
| _timer = _name == null ? new Timer() : new Timer(_name, _daemon); |
| run(); |
| super.doStart(); |
| } |
| |
| @Override |
| protected void doStop() throws Exception |
| { |
| _timer.cancel(); |
| super.doStop(); |
| _timer = null; |
| } |
| |
| @Override |
| public Task schedule(final Runnable task, final long delay, final TimeUnit units) |
| { |
| Timer timer = _timer; |
| if (timer == null) |
| throw new RejectedExecutionException("STOPPED: " + this); |
| SimpleTask t = new SimpleTask(task); |
| timer.schedule(t, units.toMillis(delay)); |
| return t; |
| } |
| |
| @Override |
| public void run() |
| { |
| Timer timer = _timer; |
| if (timer != null) |
| { |
| timer.purge(); |
| schedule(this, 1, TimeUnit.SECONDS); |
| } |
| } |
| |
| private static class SimpleTask extends TimerTask implements Task |
| { |
| private final Runnable _task; |
| |
| private SimpleTask(Runnable runnable) |
| { |
| _task = runnable; |
| } |
| |
| @Override |
| public void run() |
| { |
| try |
| { |
| _task.run(); |
| } |
| catch (Throwable x) |
| { |
| LOG.warn("Exception while executing task " + _task, x); |
| } |
| } |
| |
| @Override |
| public String toString() |
| { |
| return String.format("%s.%s@%x", |
| TimerScheduler.class.getSimpleName(), |
| SimpleTask.class.getSimpleName(), |
| hashCode()); |
| } |
| } |
| } |