AbstractSynchronization.php

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<?php
namespace Magento\AdminNotification\Model\System\Message\Media;

abstract class AbstractSynchronization implements \Magento\Framework\Notification\MessageInterface
{
    protected $_syncFlag;

    protected $_identity;

    protected $_isDisplayed = null;

    public function __construct(\Magento\MediaStorage\Model\File\Storage\Flag $fileStorage)
    {
        $this->_syncFlag = $fileStorage->loadSelf();
    }

    abstract protected function _shouldBeDisplayed();

    public function getIdentity()
    {
        return $this->_identity;
    }

    public function isDisplayed()
    {
        if (null === $this->_isDisplayed) {
            $output = $this->_shouldBeDisplayed();
            if ($output) {
                $this->_syncFlag->setState(\Magento\MediaStorage\Model\File\Storage\Flag::STATE_NOTIFIED);
                $this->_syncFlag->save();
            }
            $this->_isDisplayed = $output;
        }
        return $this->_isDisplayed;
    }

    public function getSeverity()
    {
        return \Magento\Framework\Notification\MessageInterface::SEVERITY_MAJOR;
    }
}