Extract "mark aggregate as deleted" feature into trait

src/Domain/Model/AbstractAggregateRoot.php

@@ -13,16 +13,13 @@
  */
 abstract class AbstractAggregateRoot implements AggregateRootInterface
 {
+    use DeletableTrait;
+
     /**
      * @var EventContainer
      */
     private $eventContainer;
 
-    /**
-     * @var bool
-     */
-    private $deleted = false;
-
     /**
      * @ORM\Column(type="integer", options={"unsigned"=true})
      * @var int
@@ -103,22 +100,6 @@ public function commitEvents()
         }
     }
 
-    /**
-     * Marks this aggregate as deleted, instructing a Repository to remove that aggregate at an appropriate time
-     */
-    protected function markAsDeleted()
-    {
-        $this->deleted = true;
-    }
-
-    /**
-     * @return bool
-     */
-    public function isDeleted()
-    {
-        return $this->deleted;
-    }
-
     /**
      * @return int
      */

src/Domain/Model/AggregateRootInterface.php

@@ -52,5 +52,5 @@ public function getVersion();
      *
      * @return bool
      */
-    public function isDeleted();
+    public function isDeleted(): bool;
 }

src/Domain/Model/DeletableTrait.php

@@ -0,0 +1,25 @@
+<?php
+declare(strict_types=1);
+
+namespace CQRS\Domain\Model;
+
+trait DeletableTrait
+{
+    /**
+     * @var bool
+     */
+    private $deleted = false;
+
+    /**
+     * Marks this aggregate as deleted, instructing a Repository to remove that aggregate at an appropriate time
+     */
+    protected function markAsDeleted(): void
+    {
+        $this->deleted = true;
+    }
+
+    public function isDeleted(): bool
+    {
+        return $this->deleted;
+    }
+}