NotificationStorage.php

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<?php
namespace Magento\Customer\Model\Customer;

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

class NotificationStorage
{
    const UPDATE_CUSTOMER_SESSION = 'update_customer_session';

    private $cache;

    private $serializer;

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

    public function add($notificationType, $customerId)
    {
        $this->cache->save(
            $this->serializer->serialize([
                'customer_id' => $customerId,
                'notification_type' => $notificationType
            ]),
            $this->getCacheKey($notificationType, $customerId)
        );
    }

    public function isExists($notificationType, $customerId)
    {
        return $this->cache->test($this->getCacheKey($notificationType, $customerId));
    }

    public function remove($notificationType, $customerId)
    {
        $this->cache->remove($this->getCacheKey($notificationType, $customerId));
    }

    private function getCacheKey($notificationType, $customerId)
    {
        return 'notification_' . $notificationType . '_' . $customerId;
    }
}