DelegatingTransactionalMessageListener.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.test.rollback;

import javax.jms.Connection;
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;

public class DelegatingTransactionalMessageListener implements MessageListener {

   private static final transient Logger LOG = LoggerFactory.getLogger(DelegatingTransactionalMessageListener.class);

   private final MessageListener underlyingListener;
   private boolean transacted = true;
   private int ackMode = Session.AUTO_ACKNOWLEDGE;
   private Session session;

   public DelegatingTransactionalMessageListener(MessageListener underlyingListener,
                                                 Connection connection,
                                                 Destination destination) {
      this.underlyingListener = underlyingListener;

      try {
         session = connection.createSession(transacted, ackMode);
         MessageConsumer consumer = session.createConsumer(destination);
         consumer.setMessageListener(this);
      } catch (JMSException e) {
         throw new IllegalStateException("Could not listen to " + destination, e);
      }
   }

   @Override
   public void onMessage(Message message) {
      try {
         underlyingListener.onMessage(message);
         session.commit();
      } catch (Throwable e) {
         rollback();
      }
   }

   private void rollback() {
      try {
         session.rollback();
      } catch (JMSException e) {
         LOG.error("Failed to rollback: " + e, e);
      }
   }

   public Session getSession() {
      return session;
   }
}