NotificationService.php

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<?php
namespace Magento\AdminNotification\Model;

class NotificationService
{
    protected $_notificationFactory;

    public function __construct(\Magento\AdminNotification\Model\InboxFactory $notificationFactory)
    {
        $this->_notificationFactory = $notificationFactory;
    }

    public function markAsRead($notificationId)
    {
        $notification = $this->_notificationFactory->create();
        $notification->load($notificationId);
        if (!$notification->getId()) {
            throw new \Magento\Framework\Exception\LocalizedException(__('Wrong notification ID specified.'));
        }
        $notification->setIsRead(1);
        $notification->save();
    }
}