Hi Thomas ----- Original Message ----- From: "Thomas Marsh" <[EMAIL PROTECTED]> > James: > > Are messagelets multithreaded?
Messagelets are Servlets so they follow exactly the same (& very successful) multi-threaded model. > Will messagelets be instantiated for > processing messages Tyically the servlet engine will instantiate a messagelet/servlet on startup and share the same instance for each request in concurrent threads - unless your messaglet implements SingleThreadModel in which case it will pool them. > on a given queue as fast as the messages arrive on > the queue? Yes. The message is dispatched from the JMS provider into the servlet engine (or MessageListener or MDO) in the same thread. > Or are they processed serially? I'd like them to be processed > as fast as they come in...... You can process messages from a single queue serially if you wish (which is sometimes important to preserve the ordering of the messages). Or you could process them in parallel either by * having multiple JVMs (servlet engines) processing the messages in parallel * having multiple threads & consumers in a JVM processing the same destination (queue or topic) The latter right now isn't supported terribly well. To do so we'd need to create optional thread pools per subscription, or to asynchronously dispatch all incoming messages to some worker thread pool to increase parallelism. I think the latter would be a nice idea; then there's a single worker thread pool (like in the Servlet engine itself) and all incoming messages get dispatched into it. This should be a fairly straightforward patch which I will get to eventually - but by all means beat me to it, I've a few things on my plate right now. I've added a comment (search for '####') to the code in ManagerServlet where the actual subscription occurs where we could add some kind of thread pooling in there. James _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
