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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 Terracotta, Inc.
 *
 *  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.exceptionhandler;

import net.sf.ehcache.Ehcache;

/**
 * A handler which may be registered with an Ehcache, to handle exceptions on Cache operations.
 * 
 * Handlers may be registered at configuration time in ehcache.xml, using a CacheExceptionHandlerFactory, or
 *  set at runtime (a strategy).
 * 

 * If an exception handler is registered, the default behaviour of throwing the exception will not occur. The handler
 * method onException will be called. Of course, if the handler decides to throw the exception, it will
 * propagate up through the call stack. If the handler does not, it won't.
 * 

 * Some common Exceptions thrown, and which therefore should be considered when implementing this class are listed below:
 * 

 * {@link IllegalStateException} if the cache is not {@link net.sf.ehcache.Status#STATUS_ALIVE}
 * 
{@link IllegalArgumentException} if an attempt is made to put a null element into a cache
 * 
{@link net.sf.ehcache.distribution.RemoteCacheException} if an issue occurs in remote synchronous replication
 * 

 * 

 * 
 *
 * @author Greg Luck
 * @version $Id: CacheExceptionHandler.java 5594 2012-05-07 16:04:31Z cdennis $
 */
public interface CacheExceptionHandler {

    /**
     * Called if an Exception occurs in a Cache method. This method is not called
     * if an Error occurs.
     *
     * @param ehcache   the cache in which the Exception occurred
     * @param key       the key used in the operation, or null if the operation does not use a key or the key was null
     * @param exception the Exception caught. 
     */
    void onException(Ehcache ehcache, Object key, Exception exception);
}