ProcessUrlRewriteSavingObserver.php

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<?php
namespace Magento\CmsUrlRewrite\Observer;

use Magento\Framework\Event\Observer as EventObserver;
use Magento\UrlRewrite\Model\UrlPersistInterface;
use Magento\Framework\Event\ObserverInterface;
use Magento\CmsUrlRewrite\Model\CmsPageUrlRewriteGenerator;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;

class ProcessUrlRewriteSavingObserver implements ObserverInterface
{
    protected $cmsPageUrlRewriteGenerator;

    protected $urlPersist;

    public function __construct(CmsPageUrlRewriteGenerator $cmsPageUrlRewriteGenerator, UrlPersistInterface $urlPersist)
    {
        $this->cmsPageUrlRewriteGenerator = $cmsPageUrlRewriteGenerator;
        $this->urlPersist = $urlPersist;
    }

    public function execute(EventObserver $observer)
    {
        $cmsPage = $observer->getEvent()->getObject();

        if ($cmsPage->dataHasChangedFor('identifier') || $cmsPage->dataHasChangedFor('store_id')) {
            $urls = $this->cmsPageUrlRewriteGenerator->generate($cmsPage);

            $this->urlPersist->deleteByData([
                UrlRewrite::ENTITY_ID => $cmsPage->getId(),
                UrlRewrite::ENTITY_TYPE => CmsPageUrlRewriteGenerator::ENTITY_TYPE,
            ]);
            $this->urlPersist->replace($urls);
        }
    }
}