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MQSeries.net Forum Index » IBM MQ Java / JMS » WMQ JMSRA Failover Solved! - MAYBE

WMQ JMSRA Failover Solved! - MAYBE

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shadowrunner52

Posted: Fri May 09, 2008 6:11 am Post subject: WMQ JMSRA Failover Solved! - MAYBE

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Joined: 07 Sep 2007
Posts: 10

I've been working on setting up a 2 node MQ cluster for the purposes of handing failover if one node goes down, either planned or unplanned. I am using the WMQ JMSRA on JBoss 4.0.5.

I got the CCDT all figured out and configured in my wsmq-ds.xml file however everything I could find on handling failover indicated that it would need to be coded for on the client side.

Well I figured that instead of having to change the code in all of our deployed applications that there had to be another way. So after much fiddling I discovered that if I extend the

Code:

ManagedQueueConnectionFactoryImpl

class and override the

Code:

matchManagedConnections

method that I can test to see if the connection is still valid. If it isn't I can just return a null and the resource adapter will create a new connection. Here is my method code:

Code:

public ManagedConnection matchManagedConnections(Set arg0, Subject arg1, ConnectionRequestInfo arg2) {
for(Iterator i=arg0.iterator();i.hasNext();) {
ManagedQueueConnectionImpl conn = (ManagedQueueConnectionImpl)i.next();
MQQueueSession session = null;
try {
session = (MQQueueSession)conn.getPhysicalSession();
session.createTemporaryQueue();
} catch (JMSException e) {
try {
if(conn.isTransactionStarted()) {
session.rollback();
}
conn.destroy();
} catch (JMSException e1) {
e1.printStackTrace();
}
return null;
}
}
return super.matchManagedConnections(arg0, arg1, arg2);
}

I created a single class, exported it into a .jar, stuck it in the wmq.jmsra.rar archive and deployed it to my JBoss instance and so far it seems to be working.

DISCLAIMER - This solution has not been at all thoroughly tested. Use at your own risk!

If anyone has a better solution, or suggestions on how to improve this one then please let me know.

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