My name is Matthew Renze, and I want to give you a quick overview of my course, Clean Architecture: Patterns, Practices, and Principles. In general, the further in you go, the higher level the software becomes. Clean Architecture consists of the following layers: We will walk through a sample library that controls lights over a network gateway. We name the interface for library consumers GatewayApiService: The methods getLights() and getSystemDetail() are client code entry points. For more details see the Arrow library description of Either type (it’s a Kotlin functional programming library): We can now easily create unit tests for the domain layer by injecting mocked dependencies into the getLightsUseCaseFactory (we’re using MockK here): We are mocking both the GatewayApi and the EntityConverter and pass them as parameters to the getLightsUseCaseFactory to test the resulting GetLightsUseCase. MockK related side note: giving the mockConverter a label converter@ and then using this label to refer to the this@converter.invoke() in the mock converter, the body is required, otherwise, MockK will think invoke() relates to a part of its DSL. Clean Architecture mentions a UseCase as a specification of business rules. Let's look at the code in Listing 1. Part 3 is about SOLID principles from architecture point of view and part 4 are his Component Principles about component cohesion and coupling from his Agile Software Development book. Stuff that's specific to our business is domain, and the adapter-stuff that just hooks into the technologies that enable us to run a web app (database, web servers, controllers, caches, etc) is the infrastructure. Duration: 2 days. I have renamed them here to make it easier to understand how I use them in this sample. ... Functional programming. This book is a lot padded and repeated, it finish less or more at 60/65%, the rest are appendix about very old project with very old tech where R. C. Martin worked, talking about the architecture used at a very very hight level. Side note: I implemented clean architecture in a VueJS front end project of pretty good size for actual work on a team of devs of varying skill sets and experience. The second part introduces the clean architecture. def find_definition (word): # Listing 3 url = build_url (word) data = requests. In this talk Uncle Bob walks through the basics of Functional Programming and discusses the pros and cons for adoption. Classes are meant for holding state. The DefaultGatewayApiService definition is very simple and just calls through to the appropriate use cases, injected by GatewayApiService.with(). 6FUNCTIONAL PROGRAMMING In many ways, the concepts of functional programming predate programming itself. We need to however somehow inject dependencies into each use case. Are non-functional approaches becoming obsolete? We can also replace the dependencies easily with mocks for testing. This is a data type called tagged union, disjoint union or sum type. Part 3 is about SOLID principles from architecture point of view and part 4 are his Component Principles about component cohesion and coupling from his Agile Software Development book. As we see here, both GetLightsUseCase and EntityConverter are just type aliases to functional types. LISP, Haskell, Clojure, F#. Let’s explore how we can use them to inject behavior in the classical three-layer Clean Architecture. Before I got into software design and architecture, my code was hurting . The latter name, Clean Architecture, is used as the name for this architecture in this e … It also resolves converters for each domain layer datatype using some provideConverter() method (you can resolve them using tags or class instances of the resulting domain types, like Light::class.java). 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