Lesson 61 - Extensibility Using Pub/Sub Messaging    
(posted June 3, 2019)

Architectural extensibility provides the ability to add additional functionality to a system with little or no change to the existing structure or code. One way to achieve this is through the use of publish and subscribe (pub/sub) messaging. In this lesson Mark Richards shows the issues associated with extensibility in an architecture, and illustrates how to achieve extensibility using pub/sub messaging. Knowing nothing is free, he then discusses the tradeoffs associated with using publish and subscribe messaging. 

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