protected function row($worker, $service, $current, $ready, $valid)
    {
        $mask = "| %-10.10s | %-40.40s | %-40.40s | %-5s | %-5s |";
        $text = sprintf($mask, $worker, $service, $current, $ready, $valid);
        $this->output->writeln($text);
    }