Add.php

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<?php
namespace Magento\ProductAlert\Controller;

use Magento\Framework\App\Action\Action;
use Magento\Framework\App\Action\Context;
use Magento\Customer\Model\Session as CustomerSession;
use Magento\Framework\App\RequestInterface;

abstract class Add extends Action
{
    protected $customerSession;

    public function __construct(
        Context $context,
        CustomerSession $customerSession
    ) {
        $this->customerSession = $customerSession;
        parent::__construct($context);
    }

    public function dispatch(RequestInterface $request)
    {
        if (!$this->customerSession->authenticate()) {
            $this->_actionFlag->set('', 'no-dispatch', true);
            if (!$this->customerSession->getBeforeUrl()) {
                $this->customerSession->setBeforeUrl($this->_redirect->getRefererUrl());
            }
        }
        return parent::dispatch($request);
    }
}