ApplyPersistentDataObserver.php

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<?php
namespace Magento\Persistent\Observer;

use Magento\Framework\Event\ObserverInterface;

class ApplyPersistentDataObserver implements ObserverInterface
{
    protected $_customerSession;

    protected $_persistentConfigFactory;

    protected $_persistentSession = null;

    protected $_persistentData = null;

    public function __construct(
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Persistent\Helper\Data $persistentData,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Persistent\Model\Persistent\ConfigFactory $persistentConfigFactory
    ) {
        $this->_persistentSession = $persistentSession;
        $this->_persistentData = $persistentData;
        $this->_customerSession = $customerSession;
        $this->_persistentConfigFactory = $persistentConfigFactory;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if (!$this->_persistentData->canProcess($observer)
            || !$this->_persistentSession->isPersistent()
            || $this->_customerSession->isLoggedIn()
        ) {
            return $this;
        }
        $persistentConfig = $this->_persistentConfigFactory->create();
        $persistentConfig->setConfigFilePath($this->_persistentData->getPersistentConfigFilePath())->fire();
        return $this;
    }
}