Bank account using CQRS, Event Sourcing, Kafka

Learn to build distributed Event-driven Microservices, CQRS, Event Sourcing using Kafka, MySQL and MongoDB

Architecture:

There are two microservices:

• Account Query : This microservice is responsible for read information about the accounts using the read database.
• Account Command : This microservice is responsible for managing accounts. A user can open an account, deposit funds and withdraw funds.

Concepts used

• Event-Driven Microservices
• CQRS Design Pattern
• Event Based Messages
• Kafka
• NoSQL database with MongoDB

EndPoints

Service	EndPoint	Method	Description
Account Command	/api/v1/accounts	POST	Open an account
Account Command	/api/v1/accounts/{id}/deposit	PUT	Deposit funds
Account Command	/api/v1/accounts/{id}/withdraw	PUT	Withdraw funds
Account Command	/api/v1/accounts/{id}	DELETE	Close an account
Account Command	/api/v1/operations/database/restore	POST	Restore read database
Account Query	/api/v1/accounts	GET	List of accounts
Account Query	/api/v1/accounts/{id}	GET	LIst of accounts

Documentation and examples

###Postman collection

Build & Run

• >mvn clean package : to build
• >docker-compose up --build : build docker images and containers and run containers
• >docker-compose stop : stop the dockerized services
• Each maven module has a Dockerfile.

In docker-compose.yml file:

• Account Command : 5000 port is mapped to 5000 port of host
• Account Query : 5001 port is mapped to 5001 port of host

Resources

Project is based on the course: https://www.udemy.com/course/java-microservices-cqrs-event-sourcing-with-kafka/

VERSIONS

1.0.0

• MongoDB
• MySQL
• Spring-Boot 2.6.2.RELEASE
• Java 16