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Many patterns in this chapter present ways to route messages to the proper destination without the originating application being aware of the ultimate destination of the message. Most of the patterns focused on specific types of routing logic. However, in aggregate, these patterns solve a bigger problem.

How can you decouple the destination of a message from the sender and maintain central control over the flow of messages?

Use a central Message Broker that can receive messages from multiple destinations, determine the correct destination and route the message to the correct channel. Implement the internals of the Message Broker using the design patterns presented in this chapter.

Using a central Message Broker is sometimes referred to as hub-and-spoke architectural style, which appears to be a descriptive name when looking at the diagram above.

Related patterns: Canonical Data Model, Event-Driven Consumer, Message Channel, Message Endpoint, Message Router, Pipes and Filters, Point-to-Point Channel, Publish-Subscribe Channel, Recipient List

For a full description of the pattern see:

Enterprise Integration Patterns Gregor Hohpe and Bobby Woolf ISBN 0321200683 650 pages Addison-Wesley

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© 2003 • Bobby Woolf • All rights reserved.