doLock example

$this->contextService = $contextService;
        $this->configWriter = $configWriter;
        $this->sitemapLock = $sitemapLock;
        $this->urlFilter = $urlFilter;
    }

    /** * {@inheritdoc} */
    public function generate(Shop $shop)
    {
        if (!$this->sitemapLock->doLock($shop, $this->shopwareConfig->get('sitemapRefreshTime'))) {
            throw new AlreadyLockedException(sprintf('Cannot acquire lock for shop %d', $shop->getId()));
        }

        $routerContext = Context::createFromShop($shop, $this->shopwareConfig);
        $shopContext = $this->contextService->createShopContext($shop->getId(), $shop->getCurrency()->getId(), $shop->getCustomerGroup()->getKey());

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