drop support for Symfony < 4.3

Author: Mathieu Lemoine

AsyncEventDispatcher.php

@@ -3,32 +3,10 @@
 namespace Enqueue\AsyncEventDispatcher;
 
 use Symfony\Component\EventDispatcher\Event;
-use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 
-if (class_exists(Event::class) && !class_exists(LegacyEventDispatcherProxy::class)) {
+if (class_exists(Event::class)) {
     /**
-     * Symfony < 4.3.
-     */
-    class AsyncEventDispatcher extends AbstractAsyncEventDispatcher
-    {
-        /**
-         * {@inheritdoc}
-         */
-        public function dispatch($eventName, Event $event = null)
-        {
-            $this->parentDispatch($event, $eventName);
-
-            $this->trueEventDispatcher->dispatch($eventName, $event);
-        }
-
-        protected function parentDispatch($event, $eventName)
-        {
-            parent::dispatch($eventName, $event);
-        }
-    }
-} elseif (class_exists(Event::class)) {
-    /**
-     * Symfony >= 4.3 and < 5.0.
+     * Symfony < 5.0.
      */
     class AsyncEventDispatcher extends AbstractAsyncEventDispatcher
     {

AsyncListener.php

@@ -3,39 +3,11 @@
 namespace Enqueue\AsyncEventDispatcher;
 
 use Symfony\Component\EventDispatcher\Event;
-use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Contracts\EventDispatcher\Event as ContractEvent;
 
-if (class_exists(Event::class) && !class_exists(LegacyEventDispatcherProxy::class)) {
+if (class_exists(Event::class)) {
     /**
-     * Symfony < 4.3.
-     */
-    class AsyncListener extends AbstractAsyncListener
-    {
-        public function __invoke(Event $event, $eventName)
-        {
-            $this->onEvent($event, $eventName);
-        }
-
-        /**
-         * @param string $eventName
-         */
-        public function onEvent(Event $event, $eventName)
-        {
-            if (false == isset($this->syncMode[$eventName])) {
-                $transformerName = $this->registry->getTransformerNameForEvent($eventName);
-
-                $message = $this->registry->getTransformer($transformerName)->toMessage($eventName, $event);
-                $message->setProperty('event_name', $eventName);
-                $message->setProperty('transformer_name', $transformerName);
-
-                $this->context->createProducer()->send($this->eventQueue, $message);
-            }
-        }
-    }
-} elseif (class_exists(Event::class)) {
-    /**
-     * Symfony >= 4.3 and < 5.0.
+     * Symfony < 5.0.
      */
     class AsyncListener extends AbstractAsyncListener
     {

EventTransformer.php

@@ -4,38 +4,11 @@
 
 use Interop\Queue\Message;
 use Symfony\Component\EventDispatcher\Event;
-use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Contracts\EventDispatcher\Event as ContractEvent;
 
-if (class_exists(Event::class) && !class_exists(LegacyEventDispatcherProxy::class)) {
+if (class_exists(Event::class)) {
     /**
-     * Symfony < 4.3.
-     */
-    interface EventTransformer
-    {
-        /**
-         * @param string $eventName
-         *
-         * @return Message
-         */
-        public function toMessage($eventName, Event $event = null);
-
-        /**
-         * If you able to transform message back to event return it.
-         * If you failed to transform for some reason you can return a string status.
-         *
-         * @param mixed $eventName
-         *
-         * @return Event|string|object
-         *
-         * @see Process constants) or an object that implements __toString method.
-         *      The object must have a __toString method is supposed to be used as Processor::process return value.
-         */
-        public function toEvent($eventName, Message $message);
-    }
-} elseif (class_exists(Event::class)) {
-    /**
-     * Symfony >= 4.3 and < 5.0.
+     * Symfony < 5.0.
      */
     interface EventTransformer
     {

PhpSerializerEventTransformer.php

@@ -3,23 +3,11 @@
 namespace Enqueue\AsyncEventDispatcher;
 
 use Symfony\Component\EventDispatcher\Event;
-use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Contracts\EventDispatcher\Event as ContractEvent;
 
-if (class_exists(Event::class) && !class_exists(LegacyEventDispatcherProxy::class)) {
+if (class_exists(Event::class)) {
     /**
-     * Symfony < 4.3.
-     */
-    class PhpSerializerEventTransformer extends AbstractPhpSerializerEventTransformer implements EventTransformer
-    {
-        public function toMessage($eventName, Event $event = null)
-        {
-            return $this->context->createMessage(serialize($event));
-        }
-    }
-} elseif (class_exists(Event::class)) {
-    /**
-     * Symfony >= 4.3 and < 5.0.
+     * Symfony < 5.0.
      */
     class PhpSerializerEventTransformer extends AbstractPhpSerializerEventTransformer implements EventTransformer
     {

composer.json

@@ -9,15 +9,15 @@
         "php": "^7.1.3",
         "enqueue/enqueue": "^0.9",
         "queue-interop/queue-interop": "^0.7|^0.8",
-        "symfony/event-dispatcher": "^3.4|^4|^5"
+        "symfony/event-dispatcher": "^4.3|^5"
     },
     "require-dev": {
         "phpunit/phpunit": "~7.5",
-        "symfony/dependency-injection": "^3.4|^4|^5",
-        "symfony/config": "^3.4|^4|^5",
-        "symfony/http-kernel": "^3.4|^4|^5",
-        "symfony/filesystem": "^3.4|^4|^5",
-        "symfony/yaml": "^3.4|^4|^5",
+        "symfony/dependency-injection": "^4.3|^5",
+        "symfony/config": "^4.3|^5",
+        "symfony/http-kernel": "^4.3|^5",
+        "symfony/filesystem": "^4.3|^5",
+        "symfony/yaml": "^4.3|^5",
         "enqueue/null": "0.9.x-dev",
         "enqueue/fs": "0.9.x-dev",
         "enqueue/test": "0.9.x-dev"