[Security] Implemented the Serializable interface in the Role class

src/Symfony/Component/Security/CHANGELOG.md

@@ -4,6 +4,7 @@ CHANGELOG
 2.1.0
 -----
 
+ * Added the Serializable interface on the Role class
  * [BC BREAK] The signature of ExceptionListener has changed
  * changed the HttpUtils constructor signature to take a UrlGenerator and a UrlMatcher instead of a Router
  * EncoderFactoryInterface::getEncoder() can now also take a class name as an argument

src/Symfony/Component/Security/Core/Role/Role.php

@@ -17,7 +17,7 @@
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class Role implements RoleInterface
+class Role implements RoleInterface, \Serializable
 {
     private $role;
 
@@ -38,4 +38,20 @@ public function getRole()
     {
         return $this->role;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function serialize()
+    {
+        return serialize($this->role);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function unserialize($serialized)
+    {
+        $this->role = unserialize($serialized);
+    }
 }