You should use JMS if you want to do things "asynchonously".
Since you are forbidden to create threads in your beans, you cannot call a
method on a bean directly and have it be an asynchronous call. In other
words, you will have to wait until the bean has completed its processing.
This may include calling other beans, databases, clients, etc. This
behavior can be undesirable in many situations where you just want to call
the method and have it return before doing any heavy processing, allowing
the caller to go on with other tasks.
To accomplish this you would either have to create a middleman object to
handle the threading issues (not the simplest thing to implement) or use
JMS.
-----Original Message-----
From: A mailing list for Enterprise JavaBeans development
[mailto:[EMAIL PROTECTED]]On Behalf Of Mr. Jake
Sent: Thursday, June 08, 2000 2:50 PM
To: [EMAIL PROTECTED]
Subject: Practical JMS usage
Hello,
I have been reading a lot about JMS recently, and I was wondering if anyone
could share some of the particular ways that they have been using this in
practice. It sounds potentially useful, but I'm having a hard time
identifying particular instances where this would be of benefit. I am
specifically interested in hearing how this would tie in with EJB
architecture.
I also have two specific questions regarding JMS. First, if you are using
it to do something like creating EJBs on the receipt of a message, why is
this better than, say, just creating the EJB directly via a method
invocation rather than going through the middleman of a messaging
system? Secondly, it seems like JMS is geared towards highly distributed
systems. We are in the process of building a product which is a hosted
service that would need to send messages to customers of ours. On our end,
these would be produced using Weblogic. If these messages were sent using
JMS, could our customers receive them using a different JMS vendor than
Weblogic?
Thanks,
Jake
----------------------------------------------------------------------------
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Jake Reichert email: [EMAIL PROTECTED]
Technical Lead Phone: (415) 876-7500
Allpredict Fax: (240) 250-5593
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