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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

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/**
 *  Copyright 2003-2006 Greg Luck
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package net.sf.ehcache.constructs.blocking;

/**
 * A CacheEntryFactory with one additional method, updateEntryValue((Serializable key, Serializable value)
 * which allows the cache entry to updated rather than replaced. This has the following
 * potential benefits:
 * 
 * Where only part of the value needs to be updated, it is quicker
 * 
Memory use can be smoothed, which is useful for particularly large objects which are being
 * refreshed contrinuously
 * 
 * 
 * @author Greg Luck
 * @version $Id: UpdatingCacheEntryFactory.java 124 2006-06-11 13:44:17Z gregluck $
 */
public interface UpdatingCacheEntryFactory extends CacheEntryFactory {
    /**
     * Perform an incremental update of data within a CacheEntry.
     * Based on identification of dirty values within a CacheEntry
     * Insert Update or Delete those entries based on the existing value.
     * 
     * This method does not return a modified value, because it modifies the value passed into it, relying
     * on the pass by reference feature of Java.
     *
     * Implementations of this method must be thread safe.
     *
     * @param key the cache Key
     * @param value a value copied from the value that belonged to the Element in the cache. Value must be mutable
     * @throws Exception
     */
    void updateEntryValue(Object key, Object value) throws Exception;

}