when we want to talk about design but want to puff it up to make it sound important.” “In most successful software projects, the expert developers working on that project have a shared understanding of the design system design. This shared understanding is called ‘architecture.’ This understanding includes how the system is divided into components and how the components interact through interfaces. These components are usually composed of smaller components, but the architecture only includes the components and interfaces that are understood by all the developers.” #By Ralph Johnson
business rules. It encapsulates and implements all of the use cases of the system. These use cases orchestrate the flow of data to and from the entities, and direct those entities to use their enterprise wide business rules to achieve the goals of the use case.
frameworks and tools such as the Database, the Web Framework, etc. Generally you don’t write much code in this layer other than glue code that communicates to the next circle inwards. This layer is where all the details go. The Web is a detail. The database is a detail. We keep these things on the outside where they can do little harm.
presentation layer from the logic, so that everything about how the interface works is separated from how we represent it on screen. Ideally the MVP pattern would achieve that same logic might have completely different and interchangeable views.
retrieves the data and maps it to the entity model from the business logic that acts on the model. The business logic should be agnostic to the type of data that comprises the data source layer. For example, the data source layer can be a database, a SharePoint list, or a Web service. #msdn
decoupled from domain • Domain module can be a layer module. • Data layer decouples the rest of the app • Independent of Frameworks. • Independent of UI • Independent of Database • Entities Representing Enterprise Rules
hard, and will save you a lot of headaches going forward. By separating the software into layers, and conforming to The Dependency Rule, you will create a system that is intrinsically testable, with all the benefits that implies. When any of the external parts of the system become obsolete, like the database, or the web framework, you can replace those obsolete elements with a minimum of fuss. #Uncle Bob
Architecture by Fernando Cejas https://github.com/android10/Android-CleanArchitecture • Clean Architecture by Uncle Bob https://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html • Rosie Android Framework for Clean Architecture by Karumi https://github.com/Karumi/Rosie