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/*
 * Copyright (c) 2009-2021 jMonkeyEngine
 * All rights reserved.
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 *
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 *   notice, this list of conditions and the following disclaimer.
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 *   without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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package com.jme3.asset.cache;

import com.jme3.asset.AssetKey;

/**
 * AssetCache is an interface for asset caches. 
 * Allowing storage of loaded resources in order to improve their access time 
 * if they are requested again in a short period of time.
 * Depending on the asset type and how it is used, a specialized 
 * caching method can be selected that is most appropriate for that asset type.
 * The asset cache must be thread safe.
 * 

* Some caches are used to manage cloneable assets, which track reachability * based on a shared key in all instances exposed in user code. * E.g. {@link WeakRefCloneAssetCache} uses this approach. * For those particular caches, either {@link #registerAssetClone(com.jme3.asset.AssetKey, java.lang.Object) } * or {@link #notifyNoAssetClone() } MUST be called to avoid memory * leaking following a successful {@link #addToCache(com.jme3.asset.AssetKey, java.lang.Object) } * or {@link #getFromCache(com.jme3.asset.AssetKey) } call! * * @author Kirill Vainer */ public interface AssetCache { /** * Adds an asset to the cache. * Once added, it should be possible to retrieve the asset * by using the {@link #getFromCache(com.jme3.asset.AssetKey) } method. * However, the caching criteria may at some point decide that the asset * should be removed from the cache to save memory. In that case, * {@link #getFromCache(com.jme3.asset.AssetKey) } will return null. *

Thread-Safe

* * @param The type of the asset to cache. * @param key The asset key that can be used to look up the asset. * @param obj The asset data to cache. */ public void addToCache(AssetKey key, T obj); /** * This should be called by the asset manager when it has successfully * acquired a cached asset (with {@link #getFromCache(com.jme3.asset.AssetKey) }) * and cloned it for use. *

Thread-Safe

* * @param The type of the asset to register. * @param key The asset key of the loaded asset (used to retrieve from cache) * @param clone The clone of the asset retrieved from * the cache. */ public void registerAssetClone(AssetKey key, T clone); /** * Notifies the cache that even though the methods {@link #addToCache(com.jme3.asset.AssetKey, java.lang.Object) } * or {@link #getFromCache(com.jme3.asset.AssetKey) } were used, there won't * be a call to {@link #registerAssetClone(com.jme3.asset.AssetKey, java.lang.Object) } * for some reason. For example, if an error occurred during loading * or if the addToCache/getFromCache were used from user code. */ public void notifyNoAssetClone(); /** * Retrieves an asset from the cache. * It is possible to add an asset to the cache using * {@link #addToCache(com.jme3.asset.AssetKey, java.lang.Object) }. * The asset may be removed from the cache automatically even if * it was added previously, in that case, this method will return null. *

Thread-Safe

* * @param The type of the asset to retrieve * @param key The key used to look up the asset. * @return The asset that was previously cached, or null if not found. */ public T getFromCache(AssetKey key); /** * Deletes an asset from the cache. *

Thread-Safe

* * @param key The asset key to find the asset to delete. * @return True if the asset was successfully found in the cache * and removed. */ public boolean deleteFromCache(AssetKey key); /** * Deletes all assets from the cache. *

Thread-Safe

*/ public void clearCache(); }




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