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/*
* Copyright (c) 2009-2010 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.asset;
import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.WeakHashMap;
/**
* An <code>AssetCache</code> allows storage of loaded resources in order
* to improve their access time if they are requested again in a short period
* of time. The AssetCache stores weak references to the resources, allowing
* Java's garbage collector to request deletion of rarely used resources
* when heap memory is low.
*/
public class AssetCache {
public static final class SmartAssetInfo {
public WeakReference<AssetKey> smartKey;
public Asset asset;
}
private final WeakHashMap<AssetKey, SmartAssetInfo> smartCache
= new WeakHashMap<AssetKey, SmartAssetInfo>();
private final HashMap<AssetKey, Object> regularCache = new HashMap<AssetKey, Object>();
/**
* Adds a resource to the cache.
* <br/><br/>
* <font color="red">Thread-safe.</font>
* @see #getFromCache(java.lang.String)
*/
public void addToCache(AssetKey key, Object obj){
synchronized (regularCache){
if (obj instanceof Asset && key.useSmartCache()){
// put in smart cache
Asset asset = (Asset) obj;
asset.setKey(null); // no circular references
SmartAssetInfo smartInfo = new SmartAssetInfo();
smartInfo.asset = asset;
// use the original key as smart key
smartInfo.smartKey = new WeakReference<AssetKey>(key);
smartCache.put(key, smartInfo);
}else{
// put in regular cache
regularCache.put(key, obj);
}
}
}
/**
* Delete an asset from the cache, returns true if it was deleted successfuly.
* <br/><br/>
* <font color="red">Thread-safe.</font>
*/
public boolean deleteFromCache(AssetKey key){
synchronized (regularCache){
if (key.useSmartCache()){
return smartCache.remove(key) != null;
}else{
return regularCache.remove(key) != null;
}
}
}
/**
* Gets an object from the cache given an asset key.
* <br/><br/>
* <font color="red">Thread-safe.</font>
* @param key
* @return
*/
public Object getFromCache(AssetKey key){
synchronized (regularCache){
if (key.useSmartCache()) {
return smartCache.get(key).asset;
} else {
return regularCache.get(key);
}
}
}
/**
* Retrieves smart asset info from the cache.
* @param key
* @return
*/
public SmartAssetInfo getFromSmartCache(AssetKey key){
return smartCache.get(key);
}
/**
* Deletes all the assets in the regular cache.
*/
public void deleteAllAssets(){
synchronized (regularCache){
regularCache.clear();
smartCache.clear();
}
}
}
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