StoresData.php

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<?php
declare(strict_types=1);

namespace Magento\Store\Model;

class StoresData
{
    const CACHE_TAG = 'store_relations';

    private $cache;

    private $readerList;

    private $serializer;

    public function __construct(
        \Magento\Framework\Cache\FrontendInterface $cache,
        \Magento\Store\Model\StoreResolver\ReaderList $readerList,
        \Magento\Framework\Serialize\SerializerInterface $serializer
    ) {
        $this->cache = $cache;
        $this->readerList = $readerList;
        $this->serializer = $serializer;
    }

    public function getStoresData(string $runMode, string $scopeCode = null) : array
    {
        $cacheKey = 'resolved_stores_' . md5($runMode . $scopeCode);
        $cacheData = $this->cache->load($cacheKey);
        if ($cacheData) {
            $storesData = $this->serializer->unserialize($cacheData);
        } else {
            $reader = $this->readerList->getReader($runMode);
            $storesData = [$reader->getAllowedStoreIds($scopeCode), $reader->getDefaultStoreId($scopeCode)];
            $this->cache->save(
                $this->serializer->serialize($storesData),
                $cacheKey,
                [
                    self::CACHE_TAG,
                    \Magento\Store\Model\Store::CACHE_TAG
                ]
            );
        }
        return $storesData;
    }
}