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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.internal.net4j.transport;
import org.eclipse.net4j.transport.Buffer;
import org.eclipse.net4j.transport.BufferPool;
import org.eclipse.net4j.transport.BufferProvider;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import org.eclipse.internal.net4j.bundle.Net4j;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
/**
* @author Eike Stepper
*/
public class BufferPoolImpl extends BufferProviderImpl implements BufferPool, BufferPool.Introspection
{
private static final ContextTracer TRACER = new ContextTracer(Net4j.DEBUG_BUFFER, BufferPoolImpl.class);
private final BufferProvider factory;
private final Queue<Buffer> queue = new ConcurrentLinkedQueue<Buffer>();
private int pooledBuffers;
public BufferPoolImpl(BufferProvider factory)
{
super(factory.getBufferCapacity());
this.factory = factory;
}
public int getPooledBuffers()
{
return pooledBuffers;
}
public boolean evictOne()
{
Buffer buffer = queue.poll();
if (buffer == null)
{
return false;
}
if (TRACER.isEnabled())
{
TRACER.trace("Evicting " + buffer); //$NON-NLS-1$
}
factory.retainBuffer(buffer);
--pooledBuffers;
return true;
}
public int evict(int survivors)
{
int evictedBuffers = 0;
while (pooledBuffers > survivors)
{
if (evictOne())
{
++evictedBuffers;
}
else
{
break;
}
}
return evictedBuffers;
}
@Override
protected Buffer doProvideBuffer()
{
Buffer buffer = queue.poll();
if (buffer == null)
{
buffer = factory.provideBuffer();
((BufferImpl)buffer).setBufferProvider(this);
}
buffer.clear();
if (TRACER.isEnabled())
{
TRACER.trace("Obtained " + buffer); //$NON-NLS-1$
}
return buffer;
}
@Override
protected void doRetainBuffer(Buffer buffer)
{
if (buffer.getCapacity() != getBufferCapacity())
{
throw new IllegalArgumentException("buffer.getCapacity() != getBufferCapacity()"); //$NON-NLS-1$
}
if (TRACER.isEnabled())
{
TRACER.trace("Retaining " + buffer); //$NON-NLS-1$
}
queue.add(buffer);
}
@Override
public String toString()
{
return "BufferPool[size=" + pooledBuffers + ", " + factory + "]"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
}
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