How to Design Your Use Case with Clean Architecture

Clean Architecture is a powerful approach to designing software systems, but it can be confusing to determine where each piece of code should go. By following the Dependency Rule, you can simplify the process and maintain a clean separation of concerns. Below is a step-by-step guide to implementing Clean Architecture effectively.

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You Should Know:

Key Principles of Clean Architecture

1. Dependency Rule: Inner layers should not depend on outer layers.
2. Separation of Concerns: Business logic should remain independent of frameworks and UI.
3. Testability: Each layer should be easily testable in isolation.

Practical Implementation Steps

1. Define Core Entities:

• Place business objects in the Domain layer.
• Example (C):

  public class Product 
  { 
  public int Id { get; set; } 
  public string Name { get; set; } 
  } 
  

2. Use Cases (Application Layer):

• Contains application-specific business rules.
• Example Command (MediatR):

  public class CreateProductCommand : IRequest<int> 
  { 
  public string Name { get; set; } 
  } 
  

3. Interface Adapters (Infrastructure):

• Handles data access, external APIs, and frameworks.
• Example (Entity Framework):

  public class ProductRepository : IProductRepository 
  { 
  public async Task<int> Add(Product product) { / DB logic / } 
  } 
  

4. Frameworks & UI (Presentation Layer):

• Contains controllers, APIs, or UI components.
• Example (ASP.NET Core):

  [ApiController] 
  [Route("api/products")] 
  public class ProductController : ControllerBase 
  { 
  private readonly IMediator _mediator; 
  public ProductController(IMediator mediator) => _mediator = mediator; </li>
  </ul>
  
  [HttpPost] 
  public async Task<IActionResult> Create(CreateProductCommand command) 
  => Ok(await _mediator.Send(command)); 
  } 
  

  Linux/Windows Commands for DevOps Integration

  • Build & Test (Linux):

    dotnet build 
    dotnet test 
    

  • Dockerize (Windows/Linux):

    docker build -t clean-arch-app . 
    docker run -p 8080:80 clean-arch-app 
    

  • CI/CD (GitHub Actions):

    jobs: 
    build: 
    runs-on: ubuntu-latest 
    steps: </li>
    <li>uses: actions/checkout@v2 </li>
    <li>run: dotnet build 
    

  What Undercode Say

  Clean Architecture ensures maintainability and scalability by enforcing strict layer separation. Whether you’re working on .NET, Java, or Python projects, the Dependency Rule is universal. Pair it with DevOps practices like containerization and CI/CD for robust deployments.

  Expected Output:

  A well-structured .NET solution with:

  • Domain, Application, Infrastructure, and `Presentation` projects.
  • Unit tests for each layer.
  • Docker support for cross-platform deployment.

  For further reading: Clean Architecture by Robert C. Martin.

  References:

  Reported By: Milan Jovanovic – Hackers Feeds
  Extra Hub: Undercode MoN
  Basic Verification: Pass ✅

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