clean architecture in 3 minutes

Clean Architecture Overview

• Clean architecture breaks an application into logical components.

• The key principle is that components do not need to be aware of each other.

Core Concept: Models

• Models traverse the entire application.

  • Represent entities in the database or persistence mechanisms.

  • Handle incoming requests and outgoing responses.

• Models serve as the only shared components in the architecture.

Application Flow

• Request Handling

  • Requests come from APIs, socket listeners, or user interfaces.

  • Request arrives at the application layer.

• Business Logic Processing

  • The application layer contains all business logic.

  • Logic organized into features or use cases correlating with user actions (e.g., register, sign in, add to cart).

  • Larger actions can invoke smaller actions to modularize operations.

Decoupling and Interfaces

• The application layer is ignorant of:

  • Databases, repositories, or persistence.

  • Shared services or message buses.

• Use of Interfaces

  • The application defines interfaces (e.g., an email class must have a send message method).

  • Adopt any service that matches the defined interface, enabling flexibility in swapping out services (e.g., database, email, notification).

Benefits of Clean Architecture

• Prevents stray logic in repositories and web APIs.

• Business logic remains centralized in the application layer, ensuring simplicity and clarity.

• Application processes requests in a structured manner: receive, process, send response.

• This separation of concerns enhances maintainability and scalability.