SynchronizePersistentOnLogoutObserver.php

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<?php
namespace Magento\Persistent\Observer;

use Magento\Framework\Event\Observer;

use Magento\Framework\Event\ObserverInterface;

class SynchronizePersistentOnLogoutObserver implements ObserverInterface
{
    protected $_persistentSession;

    protected $_persistentData = null;

    protected $_sessionFactory;

    public function __construct(
        \Magento\Persistent\Helper\Data $persistentData,
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Persistent\Model\SessionFactory $sessionFactory
    ) {
        $this->_persistentData = $persistentData;
        $this->_persistentSession = $persistentSession;
        $this->_sessionFactory = $sessionFactory;
    }

    public function execute(Observer $observer)
    {
        if (!$this->_persistentData->isEnabled() || !$this->_persistentData->getClearOnLogout()) {
            return;
        }

        $this->_sessionFactory->create()->removePersistentCookie();

        // Unset persistent session
        $this->_persistentSession->setSession(null);
    }
}