pets.event-driven-demo

This project demonstrates an event-driven architecture with two Spring Boot microservices communicating via RabbitMQ.

Services

• accounts-service — Exposes a REST API to create accounts and publishes events to RabbitMQ.
• message-service — Listens to account creation events and persists received messages to its own PostgreSQL database.

Architecture

• Communication: Asynchronous messaging with RabbitMQ.
• Persistence: PostgreSQL per service (separate schemas/databases).
• Containerization: Docker & Docker Compose.

Features

• Account creation via REST
• RabbitMQ message publishing
• RabbitMQ message consumption
• Database persistence in both services
• Isolated PostgreSQL containers for each service

How to Run

Make sure Docker is installed and running.

mvn clean install
docker-compose down -v && docker-compose up --build -d

Then test the system:

curl -X POST http://localhost:8081/api/accounts \
  -H "Content-Type: application/json" \
  -d '{"username": "some name"}'

Check logs in message-service to see the received message and DB insert.

Tech Stack

• Java 21
• Spring Boot 3
• Spring Web, Spring Data JPA, RabbitMQ
• PostgreSQL
• Docker, Docker Compose

License

MIT License