Simple CQRS Mediator API

This project demonstrates a lightweight implementation of the CQRS pattern with a custom mediator implementation, as an alternative to using the MediatR library.

Overview

Based on the article The Easiest Way to Replace MediatR, this project implements:

• A custom mediator that supports commands and queries
• Clean separation of concerns following CQRS principles
• Simple handlers for each command and query
• A Todo API as a practical demonstration

Project Structure

• SimpleCqrsMediator.Core:

  • Mediator, Command/Query interfaces
  • Domain models and DTOs
  • Mapping extensions
  • In-memory repositories
  • Pipeline behaviors

• SimpleCqrsMediator.Api:

  • Controllers with versioning
  • Feature-organized command and query handlers
  • HTTP requests file for testing

• SimpleCqrsMediator.Tests:

  • Unit tests for Mediator, Command/Query interfaces

API Endpoints

The API implements RESTful endpoints for Todo management:

• GET /api/v1/todos - Retrieve all todos
• GET /api/v1/todos/{id} - Retrieve a specific todo
• POST /api/v1/todos - Create a new todo
• PUT /api/v1/todos/{id} - Update an existing todo
• PATCH /api/v1/todos/{id}/toggle - Toggle todo completion status
• DELETE /api/v1/todos/{id} - Delete a todo

How to Test

Use the included HTTP file (Requests.http) to test the API endpoints.