001_request_response_pattern

Exercise - Interaction Patterns (Request-Response)

Objective

In this exercise, you will implement a request-response pattern between the Barista and CoffeeMachine actors.
The CoffeeMachine will process one coffee at a time and notify the Barista when the coffee is ready.

• The Barista will send a coffee order to the CoffeeMachine and handle its response.
• The CoffeeMachine will notify the Barista once the coffee is brewed.

Instructions

1. Edit CoffeeMachine.java:

   • Implement the logic for sending a response to the Barista when a coffee is ready.

2. Edit Barista.java:

   • Upon receiving an OrderCoffee, send a BrewCoffee message to the CoffeeMachine.
   • Handle the CoffeeIsReady response from the CoffeeMachine:

     • Log the pickup action with the following line, replacing [coffee] with the coffee received:

       getContext().getLog().info("Barista: Picking up {}", [coffee]);

     • Send a PickupCoffee message to the CoffeeMachine to reset its state.

3. Run the tests:

   • Validate your implementation by running the unit tests:

     mvn clean test

4. Hint:

   • If you need to review the completed implementation, navigate to: akka-interaction-patterns-for-java/solutions/001_request_response_pattern

Reflection

• Consider how the Barista handles responses from the CoffeeMachine.
• Observe how this interaction pattern ensures state consistency in the CoffeeMachine.