Support "AsMessageHandler"-Attribute for autoconfiguration

Classes/HandlersLocatorFactory.php

@@ -5,6 +5,7 @@ namespace DigiComp\FlowSymfonyBridge\Messenger;
 use Neos\Flow\Annotations as Flow;
 use Neos\Flow\ObjectManagement\ObjectManagerInterface;
 use Neos\Flow\Reflection\ReflectionService;
+use Symfony\Component\Messenger\Attribute\AsMessageHandler;
 use Symfony\Component\Messenger\Handler\HandlerDescriptor;
 use Symfony\Component\Messenger\Handler\HandlersLocator;
 use Symfony\Component\Messenger\Handler\MessageSubscriberInterface;
@@ -50,6 +51,27 @@ class HandlersLocatorFactory
                 );
             }
         }
+        $asHandlerClasses = $this->reflectionService
+            ->getClassNamesByAnnotation(AsMessageHandler::class);
+        foreach ($asHandlerClasses as $asHandlerClass) {
+            /** @var AsMessageHandler $annotation */
+            $annotation = $this->reflectionService->getClassAnnotation($asHandlerClass, AsMessageHandler::class);
+            $config['from_transport'] = $annotation->fromTransport;
+            $config['priority'] = $annotation->priority;
+            $method = $annotation->method ?? '__invoke';
+            $messageName = $annotation->handles;
+            if ($messageName === null) {
+                $arguments = $this->reflectionService->getMethodParameters($asHandlerClass, $method);
+                $messageName = $arguments[\array_key_first($arguments)]['class'];
+            }
+            if ($annotation->bus !== null && $annotation->bus !== $busName) {
+                continue;
+            }
+            $handlerDescriptors[$messageName][] = new HandlerDescriptor(
+                $this->objectManager->get($asHandlerClass),
+                $config
+            );
+        }
         // TODO: Maybe we can allow handlers to be added to bus or globally by configuration?
 
         return new HandlersLocator($handlerDescriptors);

Tests/Functional/Fixtures/Message/TestMessageHandler.php

@@ -2,15 +2,11 @@
 
 namespace DigiComp\FlowSymfonyBridge\Messenger\Tests\Functional\Fixtures\Message;
 
-use Symfony\Component\Messenger\Handler\MessageSubscriberInterface;
+use Symfony\Component\Messenger\Attribute\AsMessageHandler;
 
-class TestMessageHandler implements MessageSubscriberInterface
+#[AsMessageHandler]
+class TestMessageHandler
 {
-    public static function getHandledMessages(): iterable
-    {
-        yield TestMessage::class => [];
-    }
-
     public function __invoke(TestMessage $message)
     {
         //do nothing for now