Aerys\Server::stop PHP Method

    public function stop() : Promise
    {
        switch ($this->state) {
            case self::STARTED:
                $stopPromise = resolve($this->doStop());
                return timeout($stopPromise, $this->options->shutdownTimeout);
            case self::STOPPED:
                return new Success();
            default:
                return new Failure(new \LogicException("Cannot stop server: currently " . self::STATES[$this->state]));
        }
    }