Use LegacyEventDispatcherProxy for Symfony 4.3

Author: XWB

src/CacheInvalidator.php

@@ -25,6 +25,7 @@
 use FOS\HttpCache\ProxyClient\Symfony;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Toflar\Psr6HttpCacheStore\Psr6Store;
 
 /**
@@ -143,7 +144,11 @@ public function setEventDispatcher(EventDispatcherInterface $eventDispatcher)
     public function getEventDispatcher()
     {
         if (!$this->eventDispatcher) {
-            $this->eventDispatcher = new EventDispatcher();
+            if (class_exists(LegacyEventDispatcherProxy::class)) {
+                $this->eventDispatcher = LegacyEventDispatcherProxy::decorate(new EventDispatcher());
+            } else {
+                $this->eventDispatcher = new EventDispatcher();
+            }
         }
 
         return $this->eventDispatcher;

src/SymfonyCache/EventDispatchingHttpCache.php

@@ -14,6 +14,7 @@
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
@@ -54,8 +55,12 @@ trait EventDispatchingHttpCache
      */
     public function getEventDispatcher()
     {
-        if (null === $this->eventDispatcher) {
-            $this->eventDispatcher = new EventDispatcher();
+        if (!$this->eventDispatcher) {
+            if (class_exists(LegacyEventDispatcherProxy::class)) {
+                $this->eventDispatcher = LegacyEventDispatcherProxy::decorate(new EventDispatcher());
+            } else {
+                $this->eventDispatcher = new EventDispatcher();
+            }
         }
 
         return $this->eventDispatcher;

tests/Unit/CacheInvalidatorTest.php

@@ -32,6 +32,7 @@
 use Psr\Http\Message\ResponseInterface;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\EventDispatcher\EventDispatcher;
+use Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy;
 
 class CacheInvalidatorTest extends TestCase
 {
@@ -257,8 +258,13 @@ public function testEventDispatcher()
         /** @var MockInterface|Varnish $proxyClient */
         $proxyClient = \Mockery::mock(Varnish::class);
 
+        if (class_exists(LegacyEventDispatcherProxy::class)) {
+            $eventDispatcher = LegacyEventDispatcherProxy::decorate(new EventDispatcher());
+        } else {
+            $eventDispatcher = new EventDispatcher();
+        }
+
         $cacheInvalidator = new CacheInvalidator($proxyClient);
-        $eventDispatcher = new EventDispatcher();
         $cacheInvalidator->setEventDispatcher($eventDispatcher);
         $this->assertSame($eventDispatcher, $cacheInvalidator->getEventDispatcher());
     }
@@ -268,8 +274,13 @@ public function testEventDispatcherImmutable()
         /** @var MockInterface|Varnish $proxyClient */
         $proxyClient = \Mockery::mock(Varnish::class);
 
+        if (class_exists(LegacyEventDispatcherProxy::class)) {
+            $eventDispatcher = LegacyEventDispatcherProxy::decorate(new EventDispatcher());
+        } else {
+            $eventDispatcher = new EventDispatcher();
+        }
+
         $cacheInvalidator = new CacheInvalidator($proxyClient);
-        $eventDispatcher = new EventDispatcher();
         $cacheInvalidator->setEventDispatcher($eventDispatcher);
         $this->expectException(\Exception::class);
         $cacheInvalidator->setEventDispatcher($eventDispatcher);