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/**
* Copyright (c) 2004 - 2009 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 java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* @author Eike Stepper
*/
public final class ResultSynchronizer<RESULT> implements ISynchronizer<RESULT>
{
private RESULT result;
private Object consumerLock = new Object();
private CountDownLatch producerLatch = new CountDownLatch(1);
public ResultSynchronizer()
{
}
public RESULT get(long timeout)
{
try
{
final long stop = System.currentTimeMillis() + timeout;
synchronized (consumerLock)
{
while (result == null)
{
try
{
final long remaining = stop - System.currentTimeMillis();
if (remaining <= 0)
{
return null;
}
consumerLock.wait(Math.min(remaining, 100L));
}
catch (InterruptedException ex)
{
return null;
}
}
return result;
}
}
finally
{
producerLatch.countDown();
}
}
public void put(RESULT result)
{
synchronized (consumerLock)
{
this.result = result;
consumerLock.notifyAll();
}
}
public boolean put(RESULT result, long timeout)
{
synchronized (consumerLock)
{
this.result = result;
consumerLock.notifyAll();
}
try
{
if (!producerLatch.await(timeout, TimeUnit.MILLISECONDS))
{
return false;
}
}
catch (InterruptedException ex)
{
return false;
}
return true;
}
}
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