In 2015 I was introduced by my friend Roberto Ciatti to the concept of Clean Architecture, as it is called by Robert Martin. The well-known Uncle Bob talks a lot about this concept at conferences and wrote some very interesting posts about it. What he calls "Clean Architecture" is a way of structuring a software system, a set of consideration (more than strict rules) about the different layers and the role of the actors in it.
As he clearly states in a post aptly titled The Clean Architecture, the idea behind this design is not new, being built on a set of concepts that have been pushed by many software engineers over the last 3 decades. One of the first implementations may be found in the Boundary-Control-Entity model proposed by Ivar Jacobson in his masterpiece "Object-Oriented Software Engineering: A Use Case Driven Approach" published in 1992, but Martin lists other more recent versions of this architecture.
I will not repeat here what he had already explained better than I can do, so I will just point out some resources you may check to start exploring these concepts:
- The Clean Architecture a post by Robert Martin that concisely describes the goals of the architecture. It also lists resources that describe similar architectures.
- The Open Closed Principle a post by Robert Martin not strictly correlated with the Clean Architecture concept but important for the separation concept.
- Hakka Labs: Robert "Uncle Bob" Martin - Architecture: The Lost Years a video of Robert Martin from Hakka Labs.
- DDD & Testing Strategy by Lauri Taimila
- Clean Architecture by Robert Martin, published by Prentice Hall.
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