Number of topic subscriptors

[rolmovel]

Hello, is it possible to get the number of subscritor of a topic?

Thanks in advance

[mskonda]

You mean subscriptions, right?

Go to the JNDIView of the relevant Topic and invoke listAllSubscriptions() to get the list of all subscriptions.

Thanks
Madhu

[rolmovel]

Thank you very much, how can i do it programaticly?

Thanks again...

[mskonda]

Here's the method that would do what you need.

private void testSubscriptionsList(String destName, String type) throws Exception {

 QueueMBean queueMBean = null;
 TopicMBean topicMBean = null;

 try {
 //find the mbean server
 mBeanServer = (MBeanServerConnection) new InitialContext().lookup("jmx/invoker/RMIAdaptor");

 // create the relevant ON
 // Here type equals to Queue or Topic and
 // destName equals to name of the destination, for example testTopic

 serverObjectName = new ObjectName(
 "jboss.messaging.destination:service=" + type + ",name="
 + destName);

 // create either queueMBean or topicMBean
 if (type.equalsIgnoreCase("Queue")) {

 queueMBean = (QueueMBean) MBeanServerInvocationHandler
 .newProxyInstance(mBeanServer, serverObjectName,
 QueueMBean.class, false);

 } else if (type.equalsIgnoreCase("Topic")) {

 topicMBean = (TopicMBean) MBeanServerInvocationHandler
 .newProxyInstance(mBeanServer, serverObjectName,
 TopicMBean.class, false);
 }

 } catch (NamingException e) {
 logger.warn("NamingException:" + e.getMessage());
 logger.error(e);
 } catch (Exception e) {
 logger.info("Exception:" + e.getMessage());
 logger.error(e);
 }

 // once you get the relevant MBean, invoke
 // the appropriate operations.
 // For example, to list the subscription on the topic
 // do this:
 List subs = topicMBean.listAllSubscriptions();

 // iterate through the list..
 }

[rolmovel]

thank you very much...