SpringConsumer.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.spring;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.MessageListener;
import javax.jms.Session;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jms.core.JmsTemplate;

public class SpringConsumer extends ConsumerBean implements MessageListener {

   private static final Logger LOG = LoggerFactory.getLogger(SpringConsumer.class);
   private JmsTemplate template;
   private String myId = "foo";
   private Destination destination;
   private Connection connection;
   private Session session;
   private MessageConsumer consumer;

   public void start() throws JMSException {
      String selector = "next = '" + myId + "'";

      try {
         ConnectionFactory factory = template.getConnectionFactory();
         final Connection c = connection = factory.createConnection();

         // we might be a reusable connection in spring
         // so lets only set the client ID once if its not set
         synchronized (c) {
            if (c.getClientID() == null) {
               c.setClientID(myId);
            }
         }

         connection.start();

         session = connection.createSession(true, Session.CLIENT_ACKNOWLEDGE);
         consumer = session.createConsumer(destination, selector, false);
         consumer.setMessageListener(this);
      } catch (JMSException ex) {
         LOG.error("", ex);
         throw ex;
      }
   }

   public void stop() throws JMSException {
      if (consumer != null) {
         consumer.close();
      }
      if (session != null) {
         session.close();
      }
      if (connection != null) {
         connection.close();
      }
   }

   @Override
   public void onMessage(Message message) {
      super.onMessage(message);
      try {
         message.acknowledge();
      } catch (JMSException e) {
         LOG.error("Failed to acknowledge: " + e, e);
      }
   }

   // Properties
   // -------------------------------------------------------------------------
   public Destination getDestination() {
      return destination;
   }

   public void setDestination(Destination destination) {
      this.destination = destination;
   }

   public String getMyId() {
      return myId;
   }

   public void setMyId(String myId) {
      this.myId = myId;
   }

   public JmsTemplate getTemplate() {
      return template;
   }

   public void setTemplate(JmsTemplate template) {
      this.template = template;
   }
}