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/*
* Copyright (c) 2007, 2008, 2011, 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
*/
package org.eclipse.net4j.buffer;
/**
* Provides clients with the ability to obtain and retain pooled {@link IBuffer}s.
*
* @author Eike Stepper
*/
public interface IBufferPool extends IBufferProvider
{
/**
* Tries to remove a single buffer from this <code>BufferPool</code> and {@link IBuffer#release() release} it.
*
* @return <code>true</code> if a buffer could be evicted, <code>false</code> otherwise.
*/
public boolean evictOne();
/**
* Tries to remove as many buffers from this <code>BufferPool</code> and {@link IBuffer#release() release} them as are
* needed to let a given maximum number of buffers survive in the pool.
*
* @return The number of buffers that could be evicted.
*/
public int evict(int survivors);
/**
* Offers additional introspection features for {@link IBufferPool}s.
*
* @author Eike Stepper
*/
public interface Introspection extends IBufferPool, IBufferProvider.Introspection
{
/**
* Returns the number of buffers that are currently pooled in this <code>BufferPool</code>.
*/
public int getPooledBuffers();
}
}
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