| /* |
| * Copyright (c) 2008, 2009, 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.util.cache; |
| |
| /** |
| * @author Eike Stepper |
| */ |
| public class CacheRegistration implements ICacheRegistration |
| { |
| public static final float DEFAULT_RECONSTRUCTION_COST_DECAY_FACTOR = 0.1f; |
| |
| private ICacheMonitor cacheMonitor; |
| |
| private ICache cache; |
| |
| private int elementCount; |
| |
| private long cacheSize; |
| |
| private long reconstructionCost; |
| |
| public CacheRegistration(ICacheMonitor cacheMonitor, ICache cache) |
| { |
| this.cacheMonitor = cacheMonitor; |
| this.cache = cache; |
| } |
| |
| public void dispose() |
| { |
| cacheMonitor = null; |
| cache = null; |
| } |
| |
| public boolean isDisposed() |
| { |
| return cacheMonitor == null || cache == null; |
| } |
| |
| public ICacheMonitor getCacheMonitor() |
| { |
| return cacheMonitor; |
| } |
| |
| public ICache getCache() |
| { |
| return cache; |
| } |
| |
| public int getElementCount() |
| { |
| return elementCount; |
| } |
| |
| public long getCacheSize() |
| { |
| return cacheSize; |
| } |
| |
| public long getAverageElementSize() |
| { |
| return cacheSize / elementCount; |
| } |
| |
| public long getReconstructionCost() |
| { |
| return reconstructionCost; |
| } |
| |
| public void elementCached(int elementSize) |
| { |
| checkDisposal(); |
| ++elementCount; |
| cacheSize += elementSize; |
| } |
| |
| public void elementEvicted(int elementSize) |
| { |
| checkDisposal(); |
| --elementCount; |
| cacheSize -= elementSize; |
| } |
| |
| public void elementReconstructed(long reconstructionTime) |
| { |
| checkDisposal(); |
| float decayFactor = getReconstructionCostDecayFactor(); |
| reconstructionCost = (long)(decayFactor * reconstructionCost + (1 - decayFactor) * reconstructionTime); |
| } |
| |
| protected float getReconstructionCostDecayFactor() |
| { |
| return DEFAULT_RECONSTRUCTION_COST_DECAY_FACTOR; |
| } |
| |
| private void checkDisposal() |
| { |
| if (isDisposed()) |
| { |
| throw new IllegalStateException("disposed"); //$NON-NLS-1$ |
| } |
| } |
| } |