001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.servicemix.jbi.audit.lucene;
018    
019    import java.io.IOException;
020    
021    import org.apache.lucene.search.IndexSearcher;
022    
023    /**
024     * Lucene Callback Interface. Used on searching to be executed on synchronized
025     * blocks.
026     * 
027     * @author George Gastaldi
028     * @since 2.1
029     * @version $Revision: 34165 $
030     */
031    public interface LuceneCallback {
032    
033        /**
034         * Called by the LuceneIndexer
035         * 
036         * @param is
037         *            IndexSearcher provided by the indexer
038         * @return an object from the query
039         * @throws IOException
040         *             if an error occurs during opening/searching of the index
041         */
042        Object doCallback(IndexSearcher is) throws IOException;
043    }