Please check the TechStack.md file for details.

This is an example project to to offer you a very simple example of a CQRS architecture.

This project is also the official support project of my article on dev.to:

Please have a look at my Issues file to find out about improvements being made. This file contains a list of ongoing issues that on one hand do not block the development, but on the other hand they are a great nice to haves.

• 1.0.0 - 10271cee0b49da1cb80bdcd115851de94f928774 - Java
• 2.0.0 - 98eb81756c02d63d03c19e8ae87fc8023d513e0a - Java
• 3.0.0 - 696472601c04a6a26c01e83fcf464eafee4305f4 - Java
• 3.0.1 - 022a709a1fe65b57c89c68974d6577d029039eb2 - Java / Refactoring Maven (Known working dependencies)
• 3.0.2 - 3a922f4a64c6602566b3c81f4811c40cc2c119e0 - Java / Spring Boot 2.6.14 Update
• 3.0.3 - 9f53922e9be7e1a110ac9059a556a9a9571a1921 - Java / Spring Boot 2.7.6 Update, JDK19 and mono module converted to Kotlin
• 3.0.4 - ba5104f6593b7e8001f5302904b0a5f14a5697c4 - Java / Spring Boot 3.0.2 Update
• 4.0.0 - 15f2abfa5e17dc881e66b2761f5a2672fd87005a - Full Kotlin 1.8.0 / JDK19

1. List all

curl localhost:8090/video-series

2. Create new records

curl -d '{ "name":"MacGyver", "volumes":233, "cashValue": 9999.9, "genre": "ACTION"}' -H "Content-Type: application/json" -X POST http://localhost:8080/video-series

You can also test this application using swagger.

Just run:

make build-docker dcup

And then finally access the API you wish to test:

1. Command API
2. Query API

Example payload for Command API:

{
  "name": "MacGyver",
  "volumes": 233,
  "cashValue": 9999.9,
  "genre": "ACTION"
}

The best way to start this application is using the provided docker-composer configuration:

make build-docker

or

docker-composer up

or

docker composer up

There are many further options in the Makefile. Please explore them to find the one that suits you best.

In some cases you'll find that there will be a bin folder in the root. Namely, this will happen when running make build-databases or make local. This is where the jars of each application will go to. You can run them accordingly like this:

java -jar -Dspring.profiles.active=local video-series-command.jar
java -jar -Dspring.profiles.active=local video-series-query.jar

Should there be any resource consumption issues running the containers you can try to run:

make stop

This will attempt to stop all running mongodb and postgres containers, all video-series-app containers and all containers in the docker-compose file.

1. build - Builds all java bytecode
2. test - Runs the local tests (they take long in this project)
3. local - Makes a build without tests and places all jars in a /bin folder
4. no-test - Makes a build without tests
5. docker - Starts docker compose
6. docker-databases - Starts the database containers (Postgres + MongoDB) - You then need to start the SpringBoot/jars manually
7. docker-mongo - Only starts the mongodb container - This is meant to be tested with the default profile ONLY. It uses an embedded H2 database instead of Postgres.
8. build-images - Builds the images to run the spring boot processes: video-series-command and video-series-query
9. build-docker - Makes a clean build, stops containers and relaunches docker-compose.
10. stop - Makes a full stop of known containers. It is reused in many of the other commands.

1. Default - No need to mention the profile in the command line, and it needs MongoDB only. Data is stored in an embedded H2
2. local - Specified with -Dspring.profiles.active=local. Needs Postgres and MongoDb. localhost is the common host locally
3. prod - Named after Production and runs with -Dspring.profiles.active=prod. Only used in docker-compose networks

docker system prune --all

sudo lsof -i :5432

Follow the updates on the ReviewLogs file.

git checkout 1.0.0

git checkout 2.0.0

• For every image update, file VideoSeriesQueryControllerITTest must also be updated.

• Working with Postgres Audit Triggers
• Apply simplified CQRS and DDD patterns in a microservice
• Platforms JVM Records
• Mongo Axon Reference Guide
• CQRS Microservice Sampler by Ben Wilcock on GitHub
• Patrick Gillespie's Text to Ascii Art Generator
• Microservices With Spring Boot, Axon CQRS/ES, and Docker by Ben Wilcock
• Advanced Message Queuing Protocol
• Install MongoDB on Mac OS
• Object-Oriented Software Construction by Bertrand Meyer
• CQRS Journey by Microsoft