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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....
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