Design.php

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<?php
namespace Magento\Theme\Model;

use Magento\Framework\App\DesignInterface;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\Model\AbstractModel;
use Magento\Framework\Model\ResourceModel\AbstractResource;
use Magento\Framework\DataObject\IdentityInterface;
use Magento\Framework\Serialize\SerializerInterface;

class Design extends AbstractModel implements IdentityInterface, DesignInterface
{
    const CACHE_TAG = 'CORE_DESIGN';

    protected $_eventPrefix = 'core_design';

    protected $_cacheTag = self::CACHE_TAG;

    protected $_localeDate;

    protected $_dateTime;

    private $serializer;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Stdlib\DateTime\TimezoneInterface $localeDate,
        \Magento\Framework\Stdlib\DateTime $dateTime,
        AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = [],
        SerializerInterface $serializer = null
    ) {
        $this->_localeDate = $localeDate;
        $this->_dateTime = $dateTime;
        $this->serializer = $serializer ?: ObjectManager::getInstance()->get(SerializerInterface::class);
        parent::__construct($context, $registry, $resource, $resourceCollection, $data);
    }

    protected function _construct()
    {
        $this->_init(\Magento\Theme\Model\ResourceModel\Design::class);
    }

    public function loadChange($storeId, $date = null)
    {
        if ($date === null) {
            $date = $this->_dateTime->formatDate($this->_localeDate->scopeTimeStamp($storeId), false);
        }

        $changeCacheId = 'design_change_' . md5($storeId . $date);
        $result = $this->_cacheManager->load($changeCacheId);
        if ($result === false) {
            $result = $this->getResource()->loadChange($storeId, $date);
            if (!$result) {
                $result = [];
            }
            $this->_cacheManager->save($this->serializer->serialize($result), $changeCacheId, [self::CACHE_TAG], 86400);
        } else {
            $result = $this->serializer->unserialize($result);
        }

        if ($result) {
            $this->setData($result);
        }

        return $this;
    }

    public function changeDesign(\Magento\Framework\View\DesignInterface $packageInto)
    {
        $design = $this->getDesign();
        if ($design) {
            $packageInto->setDesignTheme($design);
        }
        return $this;
    }

    public function getIdentities()
    {
        return [self::CACHE_TAG . '_' . $this->getId()];
    }
}