public function generateData()
    {
        foreach ($this->fireMethods as $method) {
            $this->log(
                "Calling function \"{$method}\": Actual memory usage before method: " .
                $this->getMemoryUsageString(),
                ShopgateLogger::LOGTYPE_DEBUG
            );
            $this->{$method}();
        }

        return $this;
    }