Integration Patterns – Publish/Subscribe (Part1) by Daniel Martins Teixeira

Broadcasting, Publish/Subscribe, Distributed Messaging, One-to-many, these are just some of the names referring to the same integration pattern, which is one of the most powerful available for connecting multiple systems.

In a nutshell, this pattern is about:

• Source System publishes a message
• Target Systems subscribe to receiving that message

This enables the propagation of that message into all the target systems that subscribe to it, as illustrated in the below picture.

This pattern is not new, in fact, it’s been around for decades. It powered distributed systems with its inherent loose coupling and independence.  Publishers and subscribers are loosely coupled which allows for the systems to run independently of each other. In the traditional client-server architecture, a client cannot send a message to a server that is offline. In the Pub/Sub model, message delivered is not conditioned by the server availability. Read the complete article here.

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