22THE CLEAN ARCHITECTURE

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Over the last several decades we’ve seen a whole range of ideas regarding the architecture of systems. These include:

• Hexagonal Architecture (also known as Ports and Adapters), developed by Alistair Cockburn, and adopted by Steve Freeman and Nat Pryce in their wonderful book Growing Object Oriented Software with Tests

• DCI from James Coplien and Trygve Reenskaug

• BCE, introduced by Ivar Jacobson from his book Object Oriented Software Engineering: A Use-Case Driven Approach

Although these architectures all vary somewhat in their details, they are very similar. They all have the same objective, which is the separation ...

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