This project serves as a practical implementation of Domain-Driven Design (DDD) and Command Query Responsibility Segregation (CQRS) patterns. It is developed as an independent service that extends the functionality of an existing e-commerce application while remaining decoupled and modular.
The key goals of the project include:
- Decoupled Integration: Functionality can be added to the e-commerce system without creating tight dependencies.
- CQRS for Scalability: Separation of write and read models for better scalability and performance.
- Event-Driven Architecture: Utilize Apache Kafka for asynchronous event communication.
- Real-world DDD Concepts: Implement domain models, aggregates, and bounded contexts to demonstrate the practical use of DDD principles.
This project is both a learning exercise and a foundational prototype for building scalable, modular, and maintainable services.
The following technologies and tools are used in this project:
- Programming Language: TypeScript
- Framework: NestJS
- ORM: TypeORM
- Databases:
- PostgreSQL (for transactional and write operations)
- MongoDB (for read-optimized views and projections)
- Caching: Redis (for providing Apache Kafka event idempotency )
- Message Broker: Apache Kafka (for event streaming and asynchronous communication)
- Containerization: Docker (for consistent deployment across environments)
The high-level architecture diagram below illustrates the separation of the write and read models, along with the event-driven communication flow:
