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;
018    
019    import javax.jms.Message;
020    import javax.jms.MessageListener;
021    
022    import org.apache.camel.Endpoint;
023    import org.apache.camel.Exchange;
024    import org.apache.camel.Processor;
025    import org.apache.camel.RuntimeCamelException;
026    import org.apache.commons.logging.Log;
027    import org.apache.commons.logging.LogFactory;
028    
029    /**
030     * A JMS {@link MessageListener} which can be used to delegate processing to a
031     * Camel endpoint.
032     * 
033     * @version $Revision: 563665 $
034     */
035    public class EndpointMessageListener<E extends Exchange> implements MessageListener {
036        private static final transient Log LOG = LogFactory.getLog(EndpointMessageListener.class);
037        private Endpoint<E> endpoint;
038        private Processor processor;
039        private JmsBinding binding;
040    
041        public EndpointMessageListener(Endpoint<E> endpoint, Processor processor) {
042            this.endpoint = endpoint;
043            this.processor = processor;
044        }
045    
046        public void onMessage(Message message) {
047            try {
048    
049                if (LOG.isDebugEnabled()) {
050                    LOG.debug(endpoint + " receiving JMS message: " + message);
051                }
052                JmsExchange exchange = createExchange(message);
053                processor.process((E)exchange);
054    
055            } catch (Exception e) {
056                throw new RuntimeCamelException(e);
057            }
058        }
059    
060        public JmsExchange createExchange(Message message) {
061            return new JmsExchange(endpoint.getContext(), getBinding(), message);
062        }
063    
064        // Properties
065        // -------------------------------------------------------------------------
066        public JmsBinding getBinding() {
067            if (binding == null) {
068                binding = new JmsBinding();
069            }
070            return binding;
071        }
072    
073        /**
074         * Sets the binding used to convert from a Camel message to and from a JMS
075         * message
076         * 
077         * @param binding the binding to use
078         */
079        public void setBinding(JmsBinding binding) {
080            this.binding = binding;
081        }
082    }