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/*
* Copyright (c) 2015 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
* Simon McDuff - bug 201266
* Simon McDuff - bug 230832
*/
package org.eclipse.net4j.util.ref;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* @author Eike Stepper
* @since 3.6
*/
public abstract class CleanableReferenceQueue<T> extends ReferenceQueue<T>
{
public static final int ALL_WORK_PER_POLL = ReferenceQueueWorker.ALL_WORK_PER_POLL;
public static final int DEFAULT_MAX_WORK_PER_POLL = ReferenceQueueWorker.DEFAULT_MAX_WORK_PER_POLL;
public static final int DEFAULT_POLL_MILLIS = ReferenceQueueWorker.DEFAULT_POLL_MILLIS;
private final AtomicBoolean cleaning = new AtomicBoolean();
private int maxWorkPerPoll;
private long pollMillis;
private long lastPoll = System.currentTimeMillis();
public CleanableReferenceQueue()
{
setPollMillis(DEFAULT_POLL_MILLIS);
setMaxWorkPerPoll(DEFAULT_MAX_WORK_PER_POLL);
}
public final long getPollMillis()
{
return pollMillis;
}
public final void setPollMillis(long pollMillis)
{
this.pollMillis = pollMillis;
}
public final int getMaxWorkPerPoll()
{
return maxWorkPerPoll;
}
public final void setMaxWorkPerPoll(int maxWorkPerPoll)
{
this.maxWorkPerPoll = maxWorkPerPoll;
}
public final void register(T object)
{
clean();
createReference(object);
}
public final void clean()
{
if (cleaning.compareAndSet(false, true))
{
long now = System.currentTimeMillis();
if (lastPoll + pollMillis > now)
{
int count = maxWorkPerPoll;
if (count == ALL_WORK_PER_POLL)
{
count = Integer.MAX_VALUE;
}
for (int i = 0; i < count; i++)
{
Reference<? extends T> reference = poll();
if (reference == null)
{
break;
}
cleanReference(reference);
}
lastPoll = now;
}
cleaning.set(false);
}
}
protected abstract void cleanReference(Reference<? extends T> reference);
protected abstract Reference<T> createReference(T object);
}
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