private function createSession($name, $private, $password)
 {
     $session = new Session();
     $session->setName($name);
     $session->setIsPrivate($private);
     if ($private) {
         $session->setPassword($this->createHash($password));
     }
     $session->setLastAction(new DateTime());
     $this->save($session);
     return $session;
 }