Data.php

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<?php
namespace Magento\Framework\Config;

use Magento\Framework\Serialize\SerializerInterface;
use Magento\Framework\App\ObjectManager;

class Data implements \Magento\Framework\Config\DataInterface
{
    protected $_reader;

    protected $_cache;

    protected $_cacheId;

    protected $cacheTags = [];

    protected $_data = [];

    private $reader;

    private $cache;

    private $cacheId;

    private $serializer;

    public function __construct(
        ReaderInterface $reader,
        CacheInterface $cache,
        $cacheId,
        SerializerInterface $serializer = null
    ) {
        $this->reader = $reader;
        $this->cache = $cache;
        $this->cacheId = $cacheId;
        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(SerializerInterface::class);
        $this->initData();
    }

    protected function initData()
    {
        $data = $this->cache->load($this->cacheId);
        if (false === $data) {
            $data = $this->reader->read();
            $this->cache->save($this->serializer->serialize($data), $this->cacheId, $this->cacheTags);
        } else {
            $data = $this->serializer->unserialize($data);
        }

        $this->merge($data);
    }

    public function merge(array $config)
    {
        $this->_data = array_replace_recursive($this->_data, $config);
    }

    public function get($path = null, $default = null)
    {
        if ($path === null) {
            return $this->_data;
        }
        $keys = explode('/', $path);
        $data = $this->_data;
        foreach ($keys as $key) {
            if (is_array($data) && array_key_exists($key, $data)) {
                $data = $data[$key];
            } else {
                return $default;
            }
        }
        return $data;
    }

    public function reset()
    {
        $this->cache->remove($this->cacheId);
    }
}