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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.distribution;

import java.io.Serializable;

import net.sf.ehcache.Ehcache;

/**
 * An Event Message, in respect of a particular cache.
 * 
 * The message is Serializable, so that it can be sent across the network.
 * 
 * The value of an Element is referenced with a SoftReference, so that a
 * value will fail to be delivered in preference to an OutOfMemory error.
 *
 * @author Greg Luck
 * @version $Id: EventMessage.java 5594 2012-05-07 16:04:31Z cdennis $
 */
public class EventMessage implements Serializable {

    private static final long serialVersionUID = -293616939110963630L;

    /**
     * The key component.
     */
    private final Serializable key;

    /**
     * The associated cache.
     */
    private final transient Ehcache cache;

    /**
     * Full constructor.
     *
     * @param cache
     * @param key
     */
    public EventMessage(Ehcache cache, Serializable key) {
        this.cache = cache;
        this.key = key;
    }

    /**
     * Gets the associated {@code Ehcache}.
     *
     * @return the associated cache
     */
    public final Ehcache getEhcache() {
        return cache;
    }

    /**
     * @return the key component of the message. null if a {@link #PUT} event
     */
    public final Serializable getSerializableKey() {
        return key;
    }
}