/*
* Copyright 2009 Red Hat, Inc.
* Red Hat 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.hornetq.jms.example;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.naming.InitialContext;
import org.hornetq.common.example.HornetQExample;
/**
* A simple JMS example that sends and consume message transactionally.
*
* @author <a href="hgao@redhat.com">Howard Gao</a>
*/
public class TransactionalExample extends HornetQExample
{
public static void main(final String[] args)
{
new TransactionalExample().run(args);
}
@Override
public boolean runExample() throws Exception
{
Connection connection = null;
InitialContext initialContext = null;
try
{
// Step 1. Create an initial context to perform the JNDI lookup.
initialContext = getContext(0);
// Step 2. Look-up the JMS topic
Queue queue = (Queue)initialContext.lookup("/queue/exampleQueue");
// Step 3. Look-up the JMS connection factory
ConnectionFactory cf = (ConnectionFactory)initialContext.lookup("/ConnectionFactory");
// Step 4. Create a JMS connection
connection = cf.createConnection();
// Step 5. Start the connection
connection.start();
// Step 6. Create a transactional JMS session
Session session = connection.createSession(true, Session.SESSION_TRANSACTED);
// Step 7. Create a JMS message producer
MessageProducer messageProducer = session.createProducer(queue);
// Step 8. Create a message consumer
MessageConsumer messageConsumer = session.createConsumer(queue);
// Step 9. Create 2 text messages
TextMessage message1 = session.createTextMessage("This is a text message1");
TextMessage message2 = session.createTextMessage("This is a text message2");
// Step 10. Send the text messages to the queue
messageProducer.send(message1);
messageProducer.send(message2);
System.out.println("Sent message: " + message1.getText());
System.out.println("Sent message: " + message2.getText());
// Step 11. Receive the message, it will return null as the transaction is not committed.
TextMessage receivedMessage = (TextMessage)messageConsumer.receive(5000);
System.out.println("Message received before send commit: " + receivedMessage);
// Step 12. Commit the session
session.commit();
// Step 13. Receive the messages again
receivedMessage = (TextMessage)messageConsumer.receive(5000);
System.out.println("Message received after send commit: " + receivedMessage.getText());
// Step 14. Roll back the session, this will cause the received message canceled and redelivered again.
session.rollback();
// Step 15. Receive the message again, we will get two messages
receivedMessage = (TextMessage)messageConsumer.receive(5000);
System.out.println("Message1 received after receive rollback: " + receivedMessage.getText());
receivedMessage = (TextMessage)messageConsumer.receive(5000);
System.out.println("Message2 received after receive rollback: " + receivedMessage.getText());
receivedMessage = (TextMessage)messageConsumer.receive(5000);
System.out.println("Message3 received after receive rollback: " + receivedMessage);
// Step 16. Commit the session
session.commit();
// Step 17. Receive the message again. Nothing should be received.
receivedMessage = (TextMessage)messageConsumer.receive(5000);
if (receivedMessage != null)
{
// This was not supposed to happen
return false;
}
System.out.println("Message received after receive commit: " + receivedMessage);
return true;
}
finally
{
if (connection != null)
{
// Step 18. Be sure to close our JMS resources!
connection.close();
}
if (initialContext != null)
{
// Step 19. Also close initial context!
initialContext.close();
}
}
}
}