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Coffee Demo App

Both apps are producers and consumers at the same time, but for the purposes of the demo, producer side contract testing is set up for barista module and consumer-side contract testing is set up for waiter module.

FLOW

  • Trigger new order via HTTP call in Waiter app (@PostMapping("/order/{name}/{count}"), eg. http POST :8081/order/espresso/1
  • KafkaTemplate is used to place a new Order on orders topic
  • The Barista app listens on orders; when a new order appears, it processes it into a Serving and sends it to servings topic; if the beverage name is not matched, a CoffeeNotAvailableException is thrown and sent to errors topic
  • The Waiter app listens on servings and errors and logs information based on messages received on these topics