I implemented the following to be able to create dynamic queues. I am sure it
can easily be adapted for a Topic:
| /**
| * Gets the queue from JNDI. This is synchronized as if the queue does
not
| * exist, a new queue is created.
| * @param iniCtx
| * @param destination
| * @return
| * @throws Exception
| */
| public synchronized Queue getQueue(InitialContext iniCtx,String
destination) throws Exception{
| Queue queue=null;
| try {
| queue= (Queue)iniCtx.lookup(destination);
| } catch (NameNotFoundException e){
| System.out.println("Queue "+destination+" does not exist.");
| }
| if (queue==null)
| queue=createQueue(iniCtx,destination);
| return queue;
| }
|
| /**
| * Creates a new queue using a JbossMQ (DestinationManagerMBean) only
method,
| * thus breaking the JMS specifications.
| * @param iniCtx
| * @param destination
| * @return
| * @throws Exception
| */
| private Queue createQueue(InitialContext iniCtx,String destination)
throws Exception{
| Queue queue=null;
|
| // Get the MBean server
| MBeanServer server = (MBeanServer)
| MBeanServerFactory.findMBeanServer(null).iterator().next();
|
| // Invoke the MBean
| server.invoke(
| new ObjectName("jboss.mq:service=DestinationManager"),
| "createQueue",
| new Object[] { destination, destination },
| new String[] { String.class.getName(), String.class.getName()}
| );
|
| queue=(Queue)iniCtx.lookup(destination);
| System.out.println("Queue "+destination+" has been created.");
| return queue;
| }
|
With JBossMQ, if you have messages in the queue and your system dies, the next
time you startup and you create the queue dynamically like this, the messages
are still there and you will start off from where you left off before you
system crashed.
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