Clean Architecture

Now that we’ve covered many layering approaches, it is time to combine them into Clean Architecture, also known as Hexagonal Architecture, Onion Architecture, Ports and Adapters, and more. Clean Architecture is an evolution of the layers, yet very similar to what we just built. Instead of presentation, domain, and data (or persistence), Clean Architecture suggests UI, Core, and Infrastructure.

As we saw previously, we can design a layer so that it contains abstractions or implementations. Then, when implementations depend only on abstractions, that inverts the flow of dependency. Clean Architecture emphasizes such layers but with its own set of guidance about organizing them.

We also explored the theoretical concept of breaking layers into smaller ones (or multiple projects), thus creating “fractured layers” that are easier to port and reuse. Clean Architecture leverages that concept at the infrastructure layer level.

There are probably...