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/*
* Copyright (c) 2004 - 2012 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
* Victor Roldan Betancort - Bug 311840 - OutOfMemory with fast population of revision cache
*/
package org.eclipse.net4j.util.ref;
import org.eclipse.net4j.util.concurrent.Worker;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
/**
* @author Eike Stepper
* @since 2.0
*/
public abstract class ReferenceQueueWorker<T> extends Worker
{
/**
* @since 3.0
*/
public static final int DEFAULT_POLL_MILLIS = 1000 * 60; // One minute
/**
* @since 3.0
*/
public static final int ALL_WORK_PER_POLL = -1;
/**
* @since 3.0
*/
public static final int DEFAULT_MAX_WORK_PER_POLL = ALL_WORK_PER_POLL;
private ReferenceQueue<T> queue = new ReferenceQueue<T>();
private long pollMillis;
private int maxWorkPerPoll;
public ReferenceQueueWorker()
{
setPollMillis(DEFAULT_POLL_MILLIS);
setMaxWorkPerPoll(DEFAULT_MAX_WORK_PER_POLL);
}
public long getPollMillis()
{
return pollMillis;
}
public void setPollMillis(long pollMillis)
{
this.pollMillis = pollMillis;
}
public int getMaxWorkPerPoll()
{
return maxWorkPerPoll;
}
public void setMaxWorkPerPoll(int maxWorkPerPoll)
{
this.maxWorkPerPoll = maxWorkPerPoll;
}
protected ReferenceQueue<T> getQueue()
{
return queue;
}
@Override
protected final void work(WorkContext context) throws Exception
{
int count = maxWorkPerPoll;
if (count == ALL_WORK_PER_POLL)
{
count = Integer.MAX_VALUE;
}
for (int i = 0; i < count; i++)
{
Reference<? extends T> reference = queue.poll();
if (reference == null)
{
break;
}
work(reference);
}
context.nextWork(pollMillis);
}
protected abstract void work(Reference<? extends T> reference);
}
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