001 /**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one or more
004 * contributor license agreements. See the NOTICE file distributed with
005 * this work for additional information regarding copyright ownership.
006 * The ASF licenses this file to You under the Apache License, Version 2.0
007 * (the "License"); you may not use this file except in compliance with
008 * the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 package org.apache.camel.component.jms;
019
020 import javax.jms.Message;
021 import javax.jms.MessageListener;
022
023 import org.apache.camel.Endpoint;
024 import org.apache.camel.Exchange;
025 import org.apache.camel.Processor;
026 import org.apache.camel.RuntimeCamelException;
027 import org.apache.commons.logging.Log;
028 import org.apache.commons.logging.LogFactory;
029
030 /**
031 * A JMS {@link MessageListener} which can be used to delegate processing to a Camel endpoint.
032 *
033 * @version $Revision: 534145 $
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 message
075 *
076 * @param binding the binding to use
077 */
078 public void setBinding(JmsBinding binding) {
079 this.binding = binding;
080 }
081 }