init

src/Potter/Event/DispatcherAwareInterface.php

@@ -10,6 +10,7 @@ use \Potter\Aware\AwareInterface;
 
 interface DispatcherAwareInterface extends BaseDispatcherAwareInterface, AwareInterface
 {
-    public function useEventDispatcher(BaseDispatcher $dispatcher): void;
     public function eventDispatcher(): BaseDispatcher;
+    public function hasEventDispatcher(): bool;
+    public function useEventDispatcher(BaseDispatcher $dispatcher): void;
 }

src/Potter/Event/DispatcherAwareTrait.php

@@ -4,5 +4,34 @@ declare(strict_types=1);
 
 namespace Potter\Event;
 
+use \League\Event\EventDispatcher as BaseDispatcher;
+
 trait DispatcherAwareTrait 
-{ }
+{ 
+    private const string DISPATCHER = 'dispatcher';
+
+    final public function useEventDispatcher(BaseDispatcher $dispatcher): void
+    {
+        $this->set(self::DISPATCHER, $dispatcher);
+    }
+
+    final public function eventDispatcher(): BaseDispatcher
+    {
+        if (!$this->hasEventDispatcher()) {
+            $this->useEventDispatcher(new Dispatcher);
+        }
+        return $this->get(self::DISPATCHER);
+    }
+    
+    final public function hasEventDispatcher(): bool
+    {
+        return $this->has(self::DISPATCHER);
+    }
+    
+    abstract public function get(string $key): mixed;
+    abstract public function has(string $key): mixed;
+    abstract protected function set(string $key, mixed $value): mixed;
+    abstract protected function unset(string $key): null;
+    abstract public function with(string $key, mixed $value): static;
+    abstract public function without(string $key): static;
+}