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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.search.attribute;

import java.util.Map;

import net.sf.ehcache.Element;

/**
 * Dynamic indexing API
 * @author vfunshte
 */
public interface DynamicAttributesExtractor {
  /**
   * Given a particular cache element, returns a map from attribute names, to their respective values to use for indexing.
   * This method will be called once for every {@link Ehcache#put(Element)} and {@link Ehcache#replace(Element)} call.
   * @param element
   * @return
   */
     Map attributesFor(Element element);
}