public function getDeliveryThemeId($deliveryId)
    {
        $themeId = $this->getDeliveryThemeIdFromCache($deliveryId);
        if ($themeId === false) {
            $themeId = $this->getDeliveryThemeIdFromDb($deliveryId);
            $this->storeDeliveryThemeIdToCache($deliveryId, $themeId);
        }

        return $themeId;
    }