ActiveMQ example source code file (DelegatingTransactionalMessageListener.java)

This example ActiveMQ source code file (DelegatingTransactionalMessageListener.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

connection, delegatingtransactionalmessagelistener, delegatingtransactionalmessagelistener, destination, failed, illegalstateexception, jmsexception, jmsexception, logger, messageconsumer, messagelistener, messagelistener, session, session

The ActiveMQ DelegatingTransactionalMessageListener.java source code

/**
 * 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);
        }
    }

    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;
    }
}