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.nmr.flow.jms;
018    
019    import javax.jbi.JBIException;
020    import javax.jms.ConnectionFactory;
021    import javax.jms.JMSException;
022    import javax.jms.Message;
023    import javax.jms.MessageListener;
024    import javax.jms.Session;
025    import javax.jms.Topic;
026    
027    import org.apache.activemq.advisory.AdvisorySupport;
028    import org.apache.activemq.command.ActiveMQDestination;
029    import org.apache.activemq.command.ActiveMQMessage;
030    import org.apache.activemq.command.ConsumerId;
031    import org.apache.activemq.command.ConsumerInfo;
032    import org.apache.activemq.command.RemoveInfo;
033    import org.apache.activemq.pool.PooledConnectionFactory;
034    
035    /**
036     * Use for message routing among a network of containers. All
037     * routing/registration happens automatically.
038     * 
039     * @version $Revision: 596245 $
040     * @org.apache.xbean.XBean element="jmsFlow"
041     */
042    public class JMSFlow extends AbstractJMSFlow {
043    
044        private PooledConnectionFactory factory;
045    
046        protected ConnectionFactory createConnectionFactoryFromUrl(String jmsURL) {
047            factory = (jmsURL != null) ? new PooledConnectionFactory(jmsURL) : new PooledConnectionFactory();
048            return factory;
049        }
050    
051        /**
052         * Listener on the ActiveMQ advisory topic so we get messages when a cluster
053         * node is added or removed
054         */
055        protected void onConsumerMonitorMessage(Message advisoryMessage) {
056            if (!started.get()) {
057                return;
058            }
059            Object obj = ((ActiveMQMessage) advisoryMessage).getDataStructure();
060            if (obj instanceof ConsumerInfo) {
061                ConsumerInfo info = (ConsumerInfo) obj;
062                addClusterNode(info.getConsumerId().getConnectionId());
063            } else if (obj instanceof RemoveInfo) {
064                ConsumerId consumerId = (ConsumerId) ((RemoveInfo) obj).getObjectId();
065                removeClusterNode(consumerId.getConnectionId());
066            }
067        }
068    
069        public void startConsumerMonitor() throws JMSException {
070            Session broadcastSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
071            Topic broadcastTopic = broadcastSession.createTopic(getBroadcastDestinationName());
072            Topic advisoryTopic = AdvisorySupport.getConsumerAdvisoryTopic((ActiveMQDestination) broadcastTopic);
073            monitorMessageConsumer = broadcastSession.createConsumer(advisoryTopic);
074            monitorMessageConsumer.setMessageListener(new MessageListener() {
075                public void onMessage(Message message) {
076                    onConsumerMonitorMessage(message);
077                }
078            });
079        }
080    
081        @Override
082        public void shutDown() throws JBIException {
083            super.shutDown();
084            if (factory != null) {
085                try {
086                    factory.stop();
087                } catch (Exception e) {
088                    log.warn("Unable to stop JMS connection pool: " + e.getMessage(), e);
089                }
090            }
091        }
092    }