Comos\Qpm\Supervision\Config::_initQuantity PHP Method

    private function _initQuantity($config)
    {
        $q = self::_fetchIntValue($config, "quantity", self::DEFAULT_QUANTITY);
        if (!is_int($q) || $q < 1) {
            throw new \InvalidArgumentException('quantity must be a positive integer');
        }
        $this->_quantity = $q;
    }