CustomerLoginObserver.php

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<?php
namespace Magento\Reports\Observer;

use Magento\Framework\Event\ObserverInterface;

class CustomerLoginObserver implements ObserverInterface
{
    protected $_eventFactory;

    protected $_productCompFactory;

    protected $_productIndexFactory;

    protected $_customerSession;

    protected $_customerVisitor;

    public function __construct(
        \Magento\Reports\Model\EventFactory $event,
        \Magento\Reports\Model\Product\Index\ComparedFactory $productCompFactory,
        \Magento\Reports\Model\Product\Index\ViewedFactory $productIndexFactory,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Customer\Model\Visitor $customerVisitor
    ) {
        $this->_eventFactory = $event;
        $this->_productCompFactory = $productCompFactory;
        $this->_productIndexFactory = $productIndexFactory;
        $this->_customerSession = $customerSession;
        $this->_customerVisitor = $customerVisitor;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if (!$this->_customerSession->isLoggedIn()) {
            return $this;
        }

        $visitorId = $this->_customerVisitor->getId();
        $customerId = $this->_customerSession->getCustomerId();
        $eventModel = $this->_eventFactory->create();
        $eventModel->updateCustomerType($visitorId, $customerId);

        $this->_productCompFactory->create()->updateCustomerFromVisitor()->calculate();
        $this->_productIndexFactory->create()->updateCustomerFromVisitor()->calculate();

        return $this;
    }
}