Axon and Zeebe

Proof-of-concept integration of Zeebe workflow
engine from Camunda with Axon CQRS engine.

The idea is to use Zeebe workflow engine instead of Sagas in Axon. Example goes through a familiar scenario
of a trip booking. Workflow is used to model the sequence of events: book a car, book a hotel, book a flight
and the sequence of compensating events: cancel flight, cancel hotel, cancel flight.

The advantage of this approach is that long business process can be modeled visually with Zebee’s BPMN modeler,
and also that there is a convenient monitoring of each worflow instance state through Zeebe’s Simple monitor.

Running

Build with mvn package.
Run docker-compose build.
Run docker-compose up and wait until the workflow is deployed.

• http://localhost:8080/views/workflows should have the deployed workflow in the Zeebe’s simple monitor
• http://localhost:8081/swagger-ui.html should have Swagger API
• http://localhost:8081/h2-console should have access to H2 database

Copyright disclaimer

Some code was copied/modified from these (open) sources:

• https://github.com/gushakov/axon-simple
• https://github.com/zeebe-io/spring-zeebe/blob/master/examples/worker
• https://github.com/zeebe-io/zeebe-simple-monitor/
• https://zeebe.io/blog/2018/08/bpmn-microservices-orchestration-part-2-graphical-models/