JMS Domains

Messaging products can be classified broadly as either point-to-point (PTP) or publish-subscribe (Pub/Sub) systems. These two messaging styles are often referred to as messaging domains.

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Figure: Concept of Public-Subscribe-Messaging

The E2E Bridge only supports nondurable non-durable subscribers. That implies that subscribers to a topic receive messages only when they are active listening on that topic. Messages sent during inactivity of the subscriber will never get delivered.

When using JMS API version 1.1, a developer can use interfaces and methods that support both models of messaging. The E2E Bridge JMS adapter supports both messaging styles.

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A JMS provider is an entity that implements JMS for a messaging product, e.g. WebSphere ^TM MQ from IBM.

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JMS Client

All users of JMS are referred to generically as clients. These clients use the JMS implementations supplied by their JMS provider.

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A JMS session is strongly coupled to an E2E xUML Runtime session (see also Fast-running ACID Transactions). In every E2E Runtime session exists exactly one JMS session connected to a JMS Provider.