Implemented optimistic lock draft

application/src/Entity/Attribut/VersionAttribut.php

@@ -0,0 +1,25 @@
+<?php
+namespace App\Entity\Attribut;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+trait VersionAttribut
+{
+    /**
+     * 
+     * @var int
+     */
+    protected $version;
+    
+    public function setVersion(int $version):void{
+        $this->version = $version;
+    }
+    
+    public function getVersion():int{
+        return $this->version;
+    }
+}
+

application/src/Entity/Attribut/VersionAttributInterface.php

@@ -0,0 +1,24 @@
+<?php
+namespace App\Entity\Attribut;
+
+/**
+ * Entities which implement this interface can lock stuff on an optimistic base. 
+ * @see https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/transactions-and-concurrency.html
+ * @see https://en.wikipedia.org/wiki/Optimistic_concurrency_control
+ * @author kevinfrantz
+ */
+interface VersionAttributInterface
+{
+    /**
+     * Returns the revision version of the entity
+     * @return int
+     */
+    public function getVersion():int;
+    
+    /**
+     * Sets the revision version of the entity
+     * @param int $version
+     */
+    public function setVersion(int $version):void;
+}
+