ProcessProductAfterDeleteEventObserver.php

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<?php
namespace Magento\Review\Observer;

use Magento\Framework\Event\ObserverInterface;

class ProcessProductAfterDeleteEventObserver implements ObserverInterface
{
    protected $_resourceReview;

    protected $_resourceRating;

    public function __construct(
        \Magento\Review\Model\ResourceModel\Review $resourceReview,
        \Magento\Review\Model\ResourceModel\Rating $resourceRating
    ) {
        $this->_resourceReview = $resourceReview;
        $this->_resourceRating = $resourceRating;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $eventProduct = $observer->getEvent()->getProduct();
        if ($eventProduct && $eventProduct->getId()) {
            $this->_resourceReview->deleteReviewsByProductId($eventProduct->getId());
            $this->_resourceRating->deleteAggregatedRatingsByProductId($eventProduct->getId());
        }

        return $this;
    }
}