public function stop($drop = false)
    {
        if (!$this->valid()) {
            return false;
        }

        if ($drop) {
            $this->invalidate();
            $this->disconnect();
        } else {
            if ($this->isFlagSet(self::STATUS_SUBSCRIBED)) {
                $this->unsubscribe();
            }
            if ($this->isFlagSet(self::STATUS_PSUBSCRIBED)) {
                $this->punsubscribe();
            }
        }

        return !$drop;
    }