transition enricher rabbit

state_machines/complex_multi_module_sm/web/pom.xml

@@ -24,5 +24,9 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-activemq</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-amqp</artifactId>
+        </dependency>
     </dependencies>
 </project>

state_machines/complex_multi_module_sm/web/src/main/java/click/kamil/web/RabbitOrderListener.java

@@ -0,0 +1,32 @@
+package click.kamil.web;
+
+import click.kamil.domain.CustomStateMachineMessage;
+import click.kamil.domain.OrderEvent;
+import click.kamil.service.StateMachineService;
+import org.springframework.amqp.rabbit.annotation.RabbitListener;
+import org.springframework.stereotype.Component;
+
+@Component
+public class RabbitOrderListener {
+
+    private final StateMachineService stateMachineService;
+
+    // Constructor Injection
+    public RabbitOrderListener(StateMachineService stateMachineService) {
+        this.stateMachineService = stateMachineService;
+    }
+
+    // Listens to RabbitMQ, constructs the custom class, triggers a state transition
+    @RabbitListener(queues = "order.custom.transition.queue")
+    public void handleCustomTransition(String payload) {
+        System.out.println("Received RabbitMQ message: " + payload);
+        
+        // Construct our custom event containing the generic payload and the enum state
+        CustomStateMachineMessage<OrderEvent, String> customMessage = 
+                new CustomStateMachineMessage<>(OrderEvent.PROCESS, "My Rabbit Custom Payload: " + payload);
+        
+        // Push the custom event into the state machine to perform the transition
+        stateMachineService.sendCustomMessage(customMessage);
+        System.out.println("Triggered PROCESS transition via custom message over RabbitMQ");
+    }
+}