Implementing MDB Pool Listener in JBoss JMS - jboss

Question

I've an application deployed in JBoss with multiple MDBs deployed using JBoss JMS implementation, each one with a different configuration of MDB Pool Size. I was looking forward to some kind of mechanism where we can have a listener on each MDB Pool size where we can check if at any point all instances from the MDB pool are getting utilized. This will help in analyzing and configuring the appropriate MDB pool size for each MDB.

Answer 1

We use Jamon to monitor instances of MDBs, like this:
#MessageDriven
#TransactionManagement(value = TransactionManagementType.CONTAINER)
#TransactionAttribute(value = TransactionAttributeType.REQUIRED)
#ResourceAdapter("wmq.jmsra.rar")
#AspectDomain("YourDomainName")
public class YourMessageDrivenBean implements MessageListener
{
// jamon package constant
protected static final String WB_ONMESSAGE = "wb.onMessage";
// instance counter
private static AtomicInteger counter = new AtomicInteger(0);
private int instanceIdentifier = 0;
#Resource
MessageDrivenContext ctx;
#Override
public void onMessage(Message message)
{
final Monitor monall = MonitorFactory.start(WB_ONMESSAGE);
final Monitor mon = MonitorFactory.start(WB_ONMESSAGE + "." + toString()
+ "; mdb instance identifier=" + instanceIdentifier);
try {
// process your message here
}
} catch (final Exception x) {
log.error("Error onMessage " + x.getMessage(), x);
ctx.setRollbackOnly();
} finally {
monall.stop();
mon.stop();
}
}
#PostConstruct
public void init()
{
instanceIdentifier = counter.incrementAndGet();
log.debug("constructed instance #" + instanceIdentifier);
}
}
You can then see in the Jamon-Monitor every created instance of your MDB.