ConfigCache.php

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

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

class ConfigCache implements \Magento\Framework\ObjectManager\ConfigCacheInterface
{
    protected $_cacheFrontend;

    protected $_prefix = 'diConfig';

    private $serializer;

    public function __construct(\Magento\Framework\Cache\FrontendInterface $cacheFrontend)
    {
        $this->_cacheFrontend = $cacheFrontend;
    }

    public function get($key)
    {
        $data = $this->_cacheFrontend->load($this->_prefix . $key);
        if (!$data) {
            return false;
        }
        return $this->getSerializer()->unserialize($data);
    }

    public function save(array $config, $key)
    {
        $this->_cacheFrontend->save($this->getSerializer()->serialize($config), $this->_prefix . $key);
    }

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