This application implements an Event mechanism usable in Microservice environments.

• a publisher publishes events with one of these topics
  • customer.created
  • customer.edited
  • customer.deleted
  • order.created
  • order.edited
  • order.deleted
  • invoice.created
  • invoice.edited
  • invoice.deleted
• a subscriber subscribes to events of a specific topic from a queue specific to its (micro-)service

1. Install RabbitMQ (if it's installed on another host than localhost then you need to change the connection properties in application.properties)
2. start a couple instances of the demo application in subscriber mode, for example:
   • ./gradlew bootrun -Dspring.profiles.active=subscriber -Dsubscriber.queue=service1Queue -Dsubscriber.routingKey=customer.*
   • ./gradlew bootrun -Dspring.profiles.active=subscriber -Dsubscriber.queue=service2Queue -Dsubscriber.routingKey=.*created
   • ./gradlew bootrun -Dspring.profiles.active=subscriber -Dsubscriber.queue=service3Queue -Dsubscriber.routingKey=*.*
3. start a single instance of the demo application in publisher mode:
   • ./gradlew bootrun -Dspring.profiles.active=publisher
4. check the log output of the publisher and the subscribes to see which events are produced and which events are consumed by each subscriber