Identity Service with CQRS and DDD 🚀

A robust Identity Service implementation using CQRS (Command Query Responsibility Segregation) and DDD (Domain-Driven Design) patterns in .NET. This project demonstrates clean architecture principles with a focus on maintainability and scalability.

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🏗️ Architecture Overview

The solution follows a clean architecture approach with these key layers:

src/
├── Identity.Api/            # API Controllers and configuration
├── Identity.Application/    # Application logic, commands, and queries
├── Identity.Domain/         # Domain models and business logic
└── Identity.Infrastructure/  # External concerns and implementations

Project Structure Details

🎯 Identity.Domain

Core business logic and domain models:

• Aggregates/ - Domain aggregates
• Common/ - Base classes and shared components:
  • AggregateRoot.cs - Base for aggregate roots
  • DomainEvent.cs - Domain event definitions
  • DomainException.cs - Custom domain exceptions
  • Entity.cs - Base entity class
  • Enumeration.cs - Smart enum implementation
  • Result.cs - Operation result wrapper
  • ValueObject.cs - Value object base class
• Entities/ - Domain entities
• Events/ - Domain events
• ValueObjects/ - Value objects for domain models

📋 Identity.Application

CQRS implementation and application logic:

• Commands/ - Command handlers organized by feature

  Commands/
  ├── Users/
  │   ├── CreateUser/
  │   │   ├── CreateUserCommand.cs
  │   │   └── CreateUserCommandHandler.cs
  │   └── UpdateUser/
  │       ├── UpdateUserCommand.cs
  │       └── UpdateUserCommandHandler.cs
  

• Queries/ - Query handlers for data retrieval
• DomainEventHandlers/ - Handlers for domain events
• Common/ - Shared behaviors and interfaces

🔧 Identity.Infrastructure

Implementation details and external concerns:

• Configurations/ - System configurations
• Context/ - Database context
• Data/ - Data access implementation
• Extensions/ - Infrastructure extensions
• Migrations/ - Database migrations
• Repositories/ - Repository implementations
• Services/ - External service implementations

🚀 Key Features

• CQRS Pattern: Separate command and query responsibilities
• DDD Implementation: Rich domain model with business rules
• Smart Enums: Using Enumeration pattern for type-safe enums
• Domain Events: Event-driven architecture support
• Clean Architecture: Clear separation of concerns
• Value Objects: Immutable value objects for domain concepts

🛠️ Technical Stack

• .NET 7.0+
• Entity Framework Core
• MediatR for CQRS
• FluentValidation
• AutoMapper

📥 Getting Started

1. Clone the repository:

git clone https://github.com/Pavan8374/cqrs-ddd.git

2. Navigate to the project directory:

cd cqrs-ddd

3. Build the solution:

dotnet build

4. Run the application:

dotnet run --project src/Identity.Api/Identity.Api.csproj

🌟 Best Practices Implemented

1. Domain-Driven Design

   • Rich domain models
   • Encapsulated business rules
   • Value objects for immutable concepts

2. CQRS Pattern

   • Separated command and query models
   • Feature-based command/query organization
   • MediatR for command/query handling

3. Clean Architecture

   • Clear dependency direction
   • Domain layer independence
   • Separation of concerns

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📜 License

This project is licensed under the MIT License - see the LICENSE file for details.

👨‍💻 Author

Pavan

• GitHub: @Pavan8374

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⭐️ If you found this implementation helpful, please star this repository! It helps others discover this pattern and implementation.