closeFiles example

while ($urls = $urlProvider->getUrls($routerContext, $shopContext)) {
                $urls = $this->urlFilter->filter($urls, (int) $shop->getId());

                if (!$urls) {
                    continue;
                }

                $this->sitemapWriter->writeFile($shop, $urls);
            }
        }

        $this->sitemapWriter->closeFiles();

        $this->configWriter->save('sitemapLastRefresh', time());

        $this->sitemapLock->unLock($shop);
    }
}