Clean Architecture

1. Introduction

Clean Architecture is a software design philosophy that separates the concerns of the application into layers, making the system easier to manage, test, and scale. It emphasizes the importance of keeping the business logic independent of the frameworks and tools used to deliver the application.

2. Key Concepts

• Separation of Concerns: Each layer has a distinct responsibility.
• Dependency Rule: Dependencies can only point inwards towards the higher-level layers.
• Independence: Frameworks, UI, database, and external agencies should be replaceable without affecting the core business logic.

3. Structure of Clean Architecture

Clean Architecture is generally represented as concentric circles:

graph LR
A[Entities] --> B[Use Cases]
B --> C[Interface Adapters]
C --> D[Frameworks & Drivers]
                

4. Step-by-Step Process

1. Identify the core business entities.
2. Define use cases that encapsulate the business logic.
3. Implement interface adapters that will convert data for the outer layers.
4. Integrate frameworks and drivers around the core, ensuring they don't pollute the business logic.

5. Best Practices

• Use interfaces to define contracts between layers.
• Keep the codebase organized by maintaining clear boundaries between layers.
• Use dependency injection to manage dependencies and promote loose coupling.

6. FAQ