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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.writer.writebehind.operations;

/**
 * Interface to implement operations that are performed with write-behind and based on a key
 *
 * @author Geert Bevin
 * @version $Id: KeyBasedOperation.java 5594 2012-05-07 16:04:31Z cdennis $
 */
public interface KeyBasedOperation {
    /**
     * Retrieves the element key for this operation.
     *
     * @return the key of the element that is concerned by the operation.
     */
    Object getKey();

    /**
     * Retrieves the moment when the operation was created.
     *
     * @return the creation time in milliseconds
     */
    long getCreationTime();
}