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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* 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.lifecycle;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
/**
* @author Eike Stepper
*/
public abstract class QueueWorker<E> extends Worker
{
private BlockingQueue<E> queue;
private long pollMillis;
public QueueWorker()
{
setPollMillis(100);
}
public long getPollMillis()
{
return pollMillis;
}
public void setPollMillis(long pollMillis)
{
this.pollMillis = pollMillis;
}
public boolean addWork(E element)
{
if (queue != null)
{
return queue.offer(element);
}
return false;
}
@Override
protected final void work(WorkContext context) throws Exception
{
E element = queue.poll(pollMillis, TimeUnit.MILLISECONDS);
if (element != null)
{
work(context, element);
}
}
protected abstract void work(WorkContext context, E element);
protected BlockingQueue<E> createQueue()
{
return new LinkedBlockingQueue<E>();
}
@Override
protected void doActivate() throws Exception
{
queue = createQueue();
super.doActivate();
}
@Override
protected void doDeactivate() throws Exception
{
super.doDeactivate();
if (queue != null)
{
queue.clear();
queue = null;
}
}
}
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