Unit Of Work - Http Request Flow - Simplfied

                       

 

HTTP Request Flow:

1. HTTP Request Handling in Controllers:

   • When a user interacts with the application through the UI (web browser), a request is sent to the ASP.NET Core MVC application.
   • The routing mechanism in ASP.NET Core determines which controller and action method should handle the request based on the URL and HTTP verb (GET, POST, etc.).

2. Controller Action Execution:

   • The appropriate action method within the controller is executed.
   • The controller action method typically interacts with services to handle business logic and data operations.

3. Service Layer Interaction:

   • Controllers call methods on services (ICustomerService in your example).
   • Services encapsulate business logic and orchestrate data access operations through repositories (ICustomerRepository).

4. Unit of Work and Repository Interaction:

   • Services interact with the Unit of Work (IUnitOfWork) to manage transactions across multiple repositories (ICustomerRepository).
   • Repositories (CustomerRepository) implement specific data access operations (CRUD) using the DbContext (ApplicationDbContext).

5. DbContext and Database Interaction:

   • The DbContext (ApplicationDbContext) manages the connection to the database and represents a session with the database, allowing CRUD operations on entities (Customers in this case).

6. Transaction Management:

   • The Unit of Work (IUnitOfWork) ensures that multiple repository operations within a service method are performed within a single transaction scope. This ensures that either all operations are committed together or rolled back if an error occurs, maintaining data integrity.

Summary:

• Request Handling: Starts with the controller handling the incoming request and orchestrating the flow through services and repositories.
• Service Layer: Contains business logic and coordinates data access operations.
• Repository Layer: Implements data access logic for specific entities.
• Unit of Work: Coordinates transactions across repositories to ensure atomicity of operations.
• DbContext: Manages database interactions and entity relationships.

This structured flow ensures separation of concerns, facilitates testability, and supports maintainability in your ASP.NET Core MVC application using the Unit of Work design pattern. Adjustments and additional layers (like error handling, caching, etc.) can be incorporated based on specific application requirements and architectural preferences.