Principles of Clean Architecture

Separation of Concerns: Clean architecture emphasizes the separation of concerns within a software system, ensuring that the business logic is independent of the delivery mechanisms, such as databases, user interfaces, and external interfaces. This separation enables the creation of systems that are adaptable to change, testable, and sustainable in the long term 1 2 3

Testability and Independence: By decoupling the business logic from external dependencies, clean architecture makes software systems more testable and independent from libraries, frameworks, and databases. This results in better maintainability in the long term and improves the performance of the application 1 2

Scalability and Adaptability:Clean architecture allows new features to be added to the architecture without affecting the core functionality, making it simpler to adjust to technological changes. It also promotes adaptability to future needs and technological advancements 4

Dependency Rule:Clean architecture follows the dependency rule, which dictates that dependencies can only point inward, as the inner layers are designed not to have any knowledge of the outer layers. This control of the flow of application dependencies ensures a well-structured and maintainable architecture 5

Abstractions and Layers:Clean architecture involves adding abstractions, such as interfaces or abstract base classes, to the application layer. Layers outside of the core, such as infrastructure and persistence, then implement these abstractions. Each layer has a specific purpose, and this structured approach enables changes to have isolated impact, allowing for easy extension and maintenance of the system 2

In summary, the principles of clean architecture revolve around the separation of concerns, testability, independence, scalability, adaptability, and the use of abstractions and layers to create a well-structured and maintainable software architecture.