Rss.php

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<?php
declare(strict_types=1);

namespace Magento\Rss\Model;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\App\Rss\DataProviderInterface;
use Magento\Framework\Serialize\SerializerInterface;
use Magento\Framework\App\FeedFactoryInterface;

class Rss
{
    protected $dataProvider;

    protected $cache;

    private $feedFactory;

    private $serializer;

    public function __construct(
        \Magento\Framework\App\CacheInterface $cache,
        SerializerInterface $serializer = null,
        FeedFactoryInterface $feedFactory = null
    ) {
        $this->cache = $cache;
        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(SerializerInterface::class);
        $this->feedFactory = $feedFactory ?: ObjectManager::getInstance()->get(FeedFactoryInterface::class);
    }

    public function getFeeds()
    {
        if ($this->dataProvider === null) {
            return [];
        }
        $cache = false;
        if ($this->dataProvider->getCacheKey() && $this->dataProvider->getCacheLifetime()) {
            $cache = $this->cache->load($this->dataProvider->getCacheKey());
        }

        if ($cache) {
            return $this->serializer->unserialize($cache);
        }

        $data = $this->dataProvider->getRssData();

        if ($this->dataProvider->getCacheKey() && $this->dataProvider->getCacheLifetime()) {
            $this->cache->save(
                $this->serializer->serialize($data),
                $this->dataProvider->getCacheKey(),
                ['rss'],
                $this->dataProvider->getCacheLifetime()
            );
        }

        return $data;
    }

    public function setDataProvider(DataProviderInterface $dataProvider)
    {
        $this->dataProvider = $dataProvider;
        return $this;
    }

    public function createRssXml()
    {
        $feed = $this->feedFactory->create($this->getFeeds(), FeedFactoryInterface::FORMAT_RSS);
        return $feed->getFormattedContent();
    }
}