Java Message Service

• publish/subscribe model
• point-to-point or queuing model

The publish/subscribe model supports publishing messages to a particular message topic. Zero or more subscribers may register interest in receiving messages on a particular message topic. In this model, neither the publisher nor the subscriber know about each other.

In the point-to-point or queuing model,a producer posts messages to a particular queue and a consumer reads messages from the queue. Here the producer knows the destination of the message and posts the message directly to the consumer's queue.

See the JMS tutorial at http://java.sun.com/products/jms/tutorial/1_3-fcs/doc/overview