/*
* 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.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.XAConnection;
import javax.jms.XAConnectionFactory;
import javax.jms.XASession;
import javax.naming.InitialContext;
import javax.transaction.xa.XAResource;
import javax.transaction.xa.Xid;
import org.hornetq.common.example.DummyXid;
import org.hornetq.common.example.HornetQExample;
import org.hornetq.utils.UUIDGenerator;
/**
* A simple JMS example showing the usage of XA support in JMS.
*
* @author <a href="hgao@redhat.com">Howard Gao</a>
*/
public class XAReceiveExample extends HornetQExample
{
private volatile boolean result = true;
public static void main(final String[] args)
{
new XAReceiveExample().run(args);
}
@Override
public boolean runExample() throws Exception
{
XAConnection connection = null;
InitialContext initialContext = null;
try
{
// Step 1. Create an initial context to perform the JNDI lookup.
initialContext = getContext(0);
// Step 2. Lookup on the queue
Queue queue = (Queue)initialContext.lookup("/queue/exampleQueue");
// Step 3. Perform a lookup on the XA Connection Factory
XAConnectionFactory cf = (XAConnectionFactory)initialContext.lookup("/XAConnectionFactory");
// Step 4.Create a JMS XAConnection
connection = cf.createXAConnection();
// Step 5. Start the connection
connection.start();
// Step 6. Create a JMS XASession
XASession xaSession = connection.createXASession();
// Step 7. Create a normal session
Session normalSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
// Step 8. Create a normal Message Producer
MessageProducer normalProducer = normalSession.createProducer(queue);
// Step 9. Get the JMS Session
Session session = xaSession.getSession();
// Step 10. Create a message consumer
MessageConsumer xaConsumer = session.createConsumer(queue);
// Step 11. Create two Text Messages
TextMessage helloMessage = session.createTextMessage("hello");
TextMessage worldMessage = session.createTextMessage("world");
// Step 12. create a transaction
Xid xid1 = new DummyXid("xa-example1".getBytes(), 1, UUIDGenerator.getInstance()
.generateStringUUID()
.getBytes());
// Step 13. Get the JMS XAResource
XAResource xaRes = xaSession.getXAResource();
// Step 14. Begin the Transaction work
xaRes.start(xid1, XAResource.TMNOFLAGS);
// Step 15. Send two messages.
normalProducer.send(helloMessage);
normalProducer.send(worldMessage);
// Step 16. Receive the message
TextMessage rm1 = (TextMessage)xaConsumer.receive();
System.out.println("Message received: " + rm1.getText());
TextMessage rm2 = (TextMessage)xaConsumer.receive();
System.out.println("Message received: " + rm2.getText());
// Step 17. Stop the work
xaRes.end(xid1, XAResource.TMSUCCESS);
// Step 18. Prepare
xaRes.prepare(xid1);
// Step 19. Roll back the transaction
xaRes.rollback(xid1);
// Step 20. Create another transaction
Xid xid2 = new DummyXid("xa-example2".getBytes(), 1, UUIDGenerator.getInstance()
.generateStringUUID()
.getBytes());
// Step 21. Start the transaction
xaRes.start(xid2, XAResource.TMNOFLAGS);
// Step 22. receive those messages again
rm1 = (TextMessage)xaConsumer.receive();
System.out.println("Message received again: " + rm1.getText());
rm2 = (TextMessage)xaConsumer.receive();
System.out.println("Message received again: " + rm2.getText());
// Step 23. Stop the work
xaRes.end(xid2, XAResource.TMSUCCESS);
// Step 24. Prepare
xaRes.prepare(xid2);
// Step 25. Commit!
xaRes.commit(xid2, false);
// Step 26. Check no more messages are received.
TextMessage rm3 = (TextMessage)xaConsumer.receive(2000);
if (rm3 == null)
{
System.out.println("No message received after commit.");
}
else
{
result = false;
}
return result;
}
finally
{
// Step 27. Be sure to close our JMS resources!
if (initialContext != null)
{
initialContext.close();
}
if (connection != null)
{
connection.close();
}
}
}
}