public function delete_cache($command_name = '', $arguments= false){
    $uid = $this->hostname;
    if ( !empty($arguments) ){
      $uid .= md5(json_encode($arguments));
    }
    if ( !empty($this->cache_delete($uid, $command_name)) ){
      \bbn\x::log([$uid, $command_name], 'cache_delete');
      return true;
    }
    return false;
  }