Implement Checkout Order API

[italopessoa]

Create an API endpoint that receives a list of products and returns the order ID.

[italopessoa]

graph LR
  subgraph UI
    A[User Interface] --> B[Controller]
  end

  subgraph Controller
    B --> C[Use Case]
  end

  subgraph Use Case
    C --> D[Product Repository]
    C --> E[Order Service]
  end

  subgraph Domain
    D --> F[Product]
    E --> G[Order]
  end

  subgraph Persistence
    D --> H[Product Database]
    E --> I[Order Database]
  end

  subgraph Output
    E --> J[Order ID]
  end

  A --> B
  B --> C
  C --> D
  C --> E
  E --> J

  style D fill:#f9f,stroke:#333,stroke-width:2px
  style E fill:#f9f,stroke:#333,stroke-width:2px
  style H fill:#f9f,stroke:#333,stroke-width:2px
  style I fill:#f9f,stroke:#333,stroke-width:2px

Explanation:

• UI: Represents the user interface, which sends a request with a list of products.
• Controller: Receives the request from the UI and calls the corresponding use case.
• Use Case: Orchestrates the logic for creating an order, including:
  • Fetching product information from the product repository.
  • Creating an order using the order service.
• Product Repository: Interfaces with the database to retrieve product information.
• Order Service: Responsible for creating the order and generating the order ID.
• Product: Represents a product entity.
• Order: Represents an order entity.
• Product Database: Stores product data.
• Order Database: Stores order data.
• Order ID: The output of the API endpoint, representing the unique identifier of the created order.

Key Points of Clean Architecture:

• Dependency Inversion: The use case depends on abstractions (repositories and services) rather than concrete implementations.
• Separation of Concerns: Each layer has a specific responsibility, keeping the codebase organized and maintainable.
• Testability: The separation of layers allows for easier unit testing of individual components.
• Flexibility: The architecture is flexible and can be adapted to changing requirements.

This diagram illustrates a simplified representation of the flow for an API endpoint using clean architecture. The specific implementation details may vary depending on the chosen framework and technologies.