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.camel.component.jms.requestor;
018    
019    import java.util.concurrent.Callable;
020    import java.util.concurrent.FutureTask;
021    
022    import javax.jms.JMSException;
023    import javax.jms.Message;
024    
025    /**
026     * A {@link FutureTask} which implements {@link ReplyHandler}
027     * so that it can be used as a handler for a correlation ID
028     *
029     * @version $Revision: 473 $
030     */
031    public class FutureHandler extends FutureTask<Message> implements ReplyHandler {
032        
033        private static final Callable<Message> EMPTY_CALLABLE = new Callable<Message>() {
034            public Message call() throws Exception {
035                return null;
036            }
037        };
038    
039        public FutureHandler() {
040            super(EMPTY_CALLABLE);
041        }
042    
043        public synchronized void set(Message result) {
044            super.set(result);
045        }
046    
047        public boolean handle(Message message) throws JMSException {
048            set(message);
049            return true;
050        }
051    }