Update dispatch call

Author: XWB

src/CacheInvalidator.php

@@ -311,13 +311,25 @@ public function flush()
                 $event = new Event();
                 $event->setException($exception);
                 if ($exception instanceof ProxyResponseException) {
-                    $this->getEventDispatcher()->dispatch(Events::PROXY_RESPONSE_ERROR, $event);
+                    $this->dispatch($event, Events::PROXY_RESPONSE_ERROR);
                 } elseif ($exception instanceof ProxyUnreachableException) {
-                    $this->getEventDispatcher()->dispatch(Events::PROXY_UNREACHABLE_ERROR, $event);
+                    $this->dispatch($event, Events::PROXY_UNREACHABLE_ERROR);
                 }
             }
 
             throw $exceptions;
         }
     }
+
+    private function dispatch(Event $event, $eventName)
+    {
+        // LegacyEventDispatcherProxy exists in Symfony >= 4.3
+        if (class_exists(LegacyEventDispatcherProxy::class)) {
+            // New Symfony 4.3 EventDispatcher signature
+            $this->getEventDispatcher()->dispatch($event, $eventName);
+        } else {
+            // Old EventDispatcher signature
+            $this->getEventDispatcher()->dispatch($eventName, $event);
+        }
+    }
 }

src/SymfonyCache/EventDispatchingHttpCache.php

@@ -145,7 +145,16 @@ protected function dispatch($name, Request $request, Response $response = null,
     {
         if ($this->getEventDispatcher()->hasListeners($name)) {
             $event = new CacheEvent($this, $request, $response, $requestType);
-            $this->getEventDispatcher()->dispatch($name, $event);
+
+            // LegacyEventDispatcherProxy exists in Symfony >= 4.3
+            if (class_exists(LegacyEventDispatcherProxy::class)) {
+                // New Symfony 4.3 EventDispatcher signature
+                $this->getEventDispatcher()->dispatch($event, $name);
+            } else {
+                // Old EventDispatcher signature
+                $this->getEventDispatcher()->dispatch($name, $event);
+            }
+
             $response = $event->getResponse();
         }