moar

state_machines/complex_multi_module_sm/service/src/main/java/click/kamil/service/StateMachineService.java

@@ -14,6 +14,10 @@ public interface StateMachineService {
     // Quirky pattern 2: Generic Varargs
     <T extends IEvent> void sendEventsVarargs(T... events);
 
+    // Functional quirks: passing functions and method references
+    <T extends IEvent> void executeFunctionalTransition(java.util.function.Supplier<T> eventSupplier, 
+                                                        java.util.function.Function<T, Void> transitionAction);
+
     // Child class of Spring's GenericMessage with a generic payload
     <T extends click.kamil.domain.OrderEvent, P> void sendCustomMessage(click.kamil.domain.CustomStateMachineMessage<T, P> customMessage);
 

state_machines/complex_multi_module_sm/service/src/main/java/click/kamil/service/StateMachineServiceImpl.java

@@ -59,6 +59,15 @@ public class StateMachineServiceImpl implements StateMachineService {
         }
     }
 
+    @Override
+    public <T extends IEvent> void executeFunctionalTransition(java.util.function.Supplier<T> eventSupplier, 
+                                                               java.util.function.Function<T, Void> transitionAction) {
+        // Resolve the event from the getter / supplier function
+        T event = eventSupplier.get();
+        // Apply the transition via the provided function / method reference
+        transitionAction.apply(event);
+    }
+
     @Override
     public <T extends OrderEvent, P> void sendCustomMessage(click.kamil.domain.CustomStateMachineMessage<T, P> customMessage) {
         // Because CustomStateMachineMessage extends GenericMessage<T> and implements Message<T>,