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/***************************************************************************
* Copyright (c) 2004 - 2007 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.cache;
/**
* @author Eike Stepper
*/
public interface ICache
{
public ICacheMonitor getCacheMonitor();
/**
* Returns the number of elements in the cache that would currently be subject to eviction.
*/
public int getEvictableElementCount();
/**
* Returns the average size of an element currently in the cache or <code>UNKNOWN_ELEMENT_SIZE</code> if the
* implementor of this method is not able or willing to calculate the average element size.
*/
public int getAverageElementSize();
/**
* Returns the average time in milliseconds needed to reconstruct an element during a cache miss or
* <code>UNKNOWN_RECONSTRUCTION_TIME</code> if the implementor of this method is not able or willing to calculate
* the average reconstruction time.
*/
public long getAverageReconstructionTime();
/**
* Instructs this cache to evict <b>elementCount</b> elements and return the number of actually evicted elements.
*/
public void evictElements(int elementCount);
}
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