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/*
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.concurrent;
import org.eclipse.net4j.internal.util.bundle.OM;
import org.eclipse.net4j.util.IErrorHandler;
import org.eclipse.net4j.util.ReflectUtil.ExcludeFromDump;
import org.eclipse.net4j.util.lifecycle.Lifecycle;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* @author Eike Stepper
* @since 2.0
*/
public abstract class Worker extends Lifecycle
{
public static final int DEFAULT_TIMEOUT = 10000;
/**
* @since 3.0
*/
public static final IErrorHandler DEFAULT_ERROR_HANDLER = new IErrorHandler()
{
public void handleError(Throwable t)
{
OM.LOG.error(t);
}
};
private static IErrorHandler globalErrorHandler = DEFAULT_ERROR_HANDLER;
private boolean daemon;
private long activationTimeout = DEFAULT_TIMEOUT;
private long deactivationTimeout = DEFAULT_TIMEOUT;
@ExcludeFromDump
private transient CountDownLatch activationLatch;
@ExcludeFromDump
private transient WorkerThread workerThread;
public Worker()
{
}
public boolean isDaemon()
{
return daemon;
}
public void setDaemon(boolean daemon)
{
this.daemon = daemon;
}
public long getActivationTimeout()
{
return activationTimeout;
}
public void setActivationTimeout(long activationTimeout)
{
this.activationTimeout = activationTimeout;
}
public long getDeactivationTimeout()
{
return deactivationTimeout;
}
public void setDeactivationTimeout(long deactivationTimeout)
{
this.deactivationTimeout = deactivationTimeout;
}
@Override
protected void doActivate() throws Exception
{
super.doActivate();
activationLatch = new CountDownLatch(1);
String threadName = getThreadName();
workerThread = threadName == null ? new WorkerThread() : new WorkerThread(threadName);
workerThread.start();
if (!activationLatch.await(activationTimeout, TimeUnit.MILLISECONDS))
{
try
{
workerThread.stopRunning();
workerThread.interrupt();
}
catch (RuntimeException ex)
{
OM.LOG.warn(ex);
}
throw new TimeoutException("Worker thread activation timed out after " + activationTimeout + " millis"); //$NON-NLS-1$ //$NON-NLS-2$
}
}
@Override
protected void doDeactivate() throws Exception
{
try
{
workerThread.stopRunning();
workerThread.interrupt();
workerThread.join(deactivationTimeout);
}
catch (RuntimeException ex)
{
OM.LOG.warn(ex);
}
super.doDeactivate();
}
protected String getThreadName()
{
return null;
}
/**
* @since 3.1
*/
protected void handleError(Exception ex)
{
try
{
if (globalErrorHandler != null)
{
globalErrorHandler.handleError(ex);
}
}
catch (Exception ex1)
{
OM.LOG.error(ex1);
}
}
protected abstract void work(WorkContext context) throws Exception;
/**
* @since 3.0
*/
public static IErrorHandler getGlobalErrorHandler()
{
return globalErrorHandler;
}
/**
* @since 3.0
*/
public static IErrorHandler setGlobalErrorHandler(IErrorHandler globalErrorHandler)
{
IErrorHandler oldHandler = Worker.globalErrorHandler;
Worker.globalErrorHandler = globalErrorHandler;
return oldHandler;
}
/**
* @author Eike Stepper
*/
private final class WorkerThread extends Thread
{
private boolean running = true;
public WorkerThread()
{
setDaemon(daemon);
}
public WorkerThread(String threadName)
{
super(threadName);
setDaemon(daemon);
}
public void stopRunning()
{
running = false;
}
@Override
public void run()
{
WorkContext context = new WorkContext();
activationLatch.countDown();
while (running && !isInterrupted())
{
try
{
context.increaseCount();
work(context);
}
catch (NextWork nextWork)
{
try
{
nextWork.pause();
}
catch (InterruptedException ex)
{
break;
}
}
catch (Terminate terminate)
{
break;
}
catch (InterruptedException ex)
{
break;
}
catch (Exception ex)
{
handleError(ex);
}
}
deactivate();
}
}
/**
* @author Eike Stepper
*/
public class WorkContext
{
private long count;
public WorkContext()
{
}
public long getCount()
{
return count;
}
public void nextWork()
{
throw new NextWork();
}
public void nextWork(long pauseMillis)
{
throw new NextWork(pauseMillis);
}
public void terminate()
{
throw new Terminate();
}
private void increaseCount()
{
++count;
}
}
/**
* @author Eike Stepper
*/
private static final class NextWork extends RuntimeException
{
private static final long serialVersionUID = 1L;
private long pauseMillis;
public NextWork()
{
}
public NextWork(long pauseMillis)
{
this.pauseMillis = pauseMillis;
}
public void pause() throws InterruptedException
{
if (pauseMillis > 0)
{
Thread.sleep(pauseMillis);
}
}
}
/**
* @author Eike Stepper
*/
private static final class Terminate extends RuntimeException
{
private static final long serialVersionUID = 1L;
public Terminate()
{
}
}
}
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