public function init_flow_handle(Flow $flow)
 {
     $map = $flow->handled_map();
     $ref = new ReflectionMethod($map['class'], $map['method']);
     $doc = $ref->getDocComment();
     if (stripos($doc, '@login_required') !== false) {
         $flow->a('user', 'require', true, true);
     }
 }