ConfigLoader.php

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<?php
namespace Magento\Framework\App\ObjectManager;

use Magento\Framework\ObjectManager\ConfigLoaderInterface;
use Magento\Framework\Serialize\Serializer\Serialize;
use Magento\Framework\Serialize\SerializerInterface;

class ConfigLoader implements ConfigLoaderInterface
{
    protected $_reader;

    protected $_readerFactory;

    protected $_cache;

    private $serializer;

    public function __construct(
        \Magento\Framework\Config\CacheInterface $cache,
        \Magento\Framework\ObjectManager\Config\Reader\DomFactory $readerFactory
    ) {
        $this->_cache = $cache;
        $this->_readerFactory = $readerFactory;
    }

    protected function _getReader()
    {
        if (empty($this->_reader)) {
            $this->_reader = $this->_readerFactory->create();
        }
        return $this->_reader;
    }

    public function load($area)
    {
        $cacheId = $area . '::DiConfig';
        $data = $this->_cache->load($cacheId);

        if (!$data) {
            $data = $this->_getReader()->read($area);
            $this->_cache->save($this->getSerializer()->serialize($data), $cacheId);
        } else {
            $data = $this->getSerializer()->unserialize($data);
        }

        return $data;
    }

    private function getSerializer()
    {
        if (null === $this->serializer) {
            $this->serializer = \Magento\Framework\App\ObjectManager::getInstance()->get(Serialize::class);
        }
        return $this->serializer;
    }
}