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/***************************************************************************
* Copyright (c) 2004, 2005, 2006 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.concurrent;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* @author Eike Stepper
*/
public class SynchronizingCorrelator<CORRELATION, RESULT> implements Correlator<CORRELATION, Synchronizer<RESULT>>
{
private ConcurrentMap<CORRELATION, Synchronizer<RESULT>> map = new ConcurrentHashMap(0);
public boolean isCorrelated(CORRELATION correlation)
{
return map.containsKey(correlation);
}
public Synchronizer<RESULT> correlate(CORRELATION correlation)
{
Synchronizer<RESULT> synchronizer = map.get(correlation);
if (synchronizer == null)
{
synchronizer = createSynchronizer(correlation);
map.put(correlation, synchronizer);
}
return synchronizer;
}
public Synchronizer<RESULT> correlateUnique(CORRELATION correlation)
{
Synchronizer<RESULT> synchronizer = createSynchronizer(correlation);
if (map.putIfAbsent(correlation, synchronizer) != null)
{
throw new IllegalStateException("Already correlated: " + correlation); //$NON-NLS-1$
}
return synchronizer;
}
public Synchronizer<RESULT> uncorrelate(CORRELATION correlation)
{
return map.remove(correlation);
}
public RESULT get(CORRELATION correlation, long timeout)
{
return correlate(correlation).get(timeout);
}
public void put(CORRELATION correlation, RESULT result)
{
correlate(correlation).put(result);
}
public boolean put(CORRELATION correlation, RESULT result, long timeout)
{
return correlate(correlation).put(result, timeout);
}
protected Synchronizer<RESULT> createSynchronizer(final CORRELATION correlation)
{
return new Synchronizer<RESULT>()
{
private Synchronizer<RESULT> delegate = new ResultSynchronizer<RESULT>();
public RESULT get(long timeout)
{
RESULT result = delegate.get(timeout);
uncorrelate(correlation);
return result;
}
public void put(RESULT result)
{
delegate.put(result);
}
public boolean put(RESULT result, long timeout)
{
return delegate.put(result, timeout);
}
};
}
@Override
public String toString()
{
return "SynchronizingCorrelator" + map;
}
}
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