/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.solr.search;
import java.io.IOException;
/**
* Implementations of <code>CacheRegenerator</code> are used in autowarming to populate a new cache
* based on an old cache. <code>regenerateItem</code> is called for each item that should be inserted into the new cache.
* <p>
* Implementations should have a noarg constructor and be thread safe (a single instance will be
* used for all cache autowarmings).
*
* @version $Id: CacheRegenerator.java 555343 2007-07-11 17:46:25Z hossman $
*/
public interface CacheRegenerator {
/**
* Regenerate an old cache item and insert it into <code>newCache</code>
*
* @param newSearcher the new searcher who's caches are being autowarmed
* @param newCache where regenerated cache items should be stored. the target of the autowarming
* @param oldCache the old cache being used as a source for autowarming
* @param oldKey the key of the old cache item to regenerate in the new cache
* @param oldVal the old value of the cache item
* @return true to continue with autowarming, false to stop
*/
public boolean regenerateItem(SolrIndexSearcher newSearcher, SolrCache newCache, SolrCache oldCache, Object oldKey, Object oldVal) throws IOException;
}