June 2004
Intermediate to advanced
792 pages
23h 17m
English
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Asynchronous Messaging
In addition to supporting RMI-based distributed business objects, Enterprise JavaBeans supports asynchronous messaging. An asynchronous messaging system allows two or more applications to exchange information in the form of messages. A message, in this case, is a self-contained package of business data and network routing headers. The business data contained in a message can be anything—depending on the business scenario—and usually contains information about some business transaction. In enterprise systems, messages inform an application of some event or occurrence in another system.
Asynchronous messages may be transmitted from one application to another on a network using message-oriented middleware (MOM). MOM products ensure that messages are properly distributed among applications. In addition, MOM usually provides fault-tolerance, load-balancing, scalability, and transactional support for enterprises that need to reliably exchange large quantities of messages. MOM vendors use different message formats and network protocols for exchanging messages, but the basic semantics are the same. An API is used to create a message, give it a payload (application data), assign it routing information, and then send the message. The same API is used to receive messages produced by other applications.
In modern enterprise-messaging systems, applications exchange messages through virtual channels called destinations . When you send a message, it’s addressed to a destination, ...
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