/*
* 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.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TemporaryQueue;
import javax.jms.TextMessage;
import javax.naming.InitialContext;
import org.hornetq.common.example.HornetQExample;
/**
* A simple JMS example that shows how to use temporary queues.
*
* @author <a href="hgao@redhat.com">Howard Gao</a>
*/
public class TemporaryQueueExample extends HornetQExample
{
public static void main(final String[] args)
{
new TemporaryQueueExample().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 connection factory
ConnectionFactory cf = (ConnectionFactory)initialContext.lookup("/ConnectionFactory");
// Step 3. Create a JMS Connection
connection = cf.createConnection();
// Step 4. Start the connection
connection.start();
// Step 5. Create a JMS session with AUTO_ACKNOWLEDGE mode
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Step 6. Create a Temporary Queue
TemporaryQueue tempQueue = session.createTemporaryQueue();
System.out.println("Temporary queue is created: " + tempQueue);
// Step 7. Create a JMS message producer
MessageProducer messageProducer = session.createProducer(tempQueue);
// Step 8. Create a text message
TextMessage message = session.createTextMessage("This is a text message");
// Step 9. Send the text message to the queue
messageProducer.send(message);
System.out.println("Sent message: " + message.getText());
// Step 11. Create a message consumer
MessageConsumer messageConsumer = session.createConsumer(tempQueue);
// Step 12. Receive the message from the queue
message = (TextMessage)messageConsumer.receive(5000);
System.out.println("Received message: " + message.getText());
// Step 13. Close the consumer and producer
messageConsumer.close();
messageProducer.close();
// Step 14. Delete the temporary queue
tempQueue.delete();
// Step 15. Create another temporary queue.
TemporaryQueue tempQueue2 = session.createTemporaryQueue();
System.out.println("Another temporary queue is created: " + tempQueue2);
// Step 16. Close the connection.
connection.close();
// Step 17. Create a new connection.
connection = cf.createConnection();
// Step 18. Create a new session.
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Step 19. Try to access the tempQueue2 outside its lifetime
try
{
messageConsumer = session.createConsumer(tempQueue2);
throw new Exception("Temporary queue cannot be accessed outside its lifecycle!");
}
catch (JMSException e)
{
System.out.println("Exception got when trying to access a temp queue outside its scope: " + e);
}
return true;
}
finally
{
if (connection != null)
{
// Step 20. Be sure to close our JMS resources!
connection.close();
}
if (initialContext != null)
{
// Step 21. Also close the initialContext!
initialContext.close();
}
}
}
}