June 2004
Intermediate to advanced
792 pages
23h 17m
English
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Chapter 12. Message-Driven Beans
The Message-Driven Bean was introduced in EJB 2.0 to support the processing of asynchronous messages from a Java Message Service (JMS) provider. EJB 2.1 expanded the definition of the message-driven bean so that it can support any messaging system, not just JMS. This chapter examines both JMS-based message-driven beans, which all EJB 2.0 and EJB 2.1 vendors must support, as well as the expanded message-driven bean model available to EJB 2.1 developers.
JMS and Message-Driven Beans
All EJB 2.0 vendors must support a JMS provider. Most vendors have a JMS provider built in, but some may also support other JMS providers. EJB 2.1 vendors can support any JMS provider that complies with the J2EE Connector Architecture 1.5. However, regardless of whether your vendor has its own JMS provider, or allows you to integrate some other provider, a JMS provider is an absolute necessity for supporting message-driven beans. By forcing the adoption of JMS, Sun has guaranteed that EJB developers can expect to have a working JMS provider on which messages can be both sent and received.
JMS as a Resource
JMS is a vendor-neutral API that can be used to access enterprise messaging systems. Enterprise messaging systems (a.k.a. message-oriented middleware) facilitate the exchange of messages between software applications over a network. The role of JMS isn’t unlike the role of JDBC: just as JDBC provides a common API for accessing many different relational databases, JMS provides ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.