Review.php

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<?php
namespace Magento\Review\Block\Product;

use Magento\Framework\DataObject\IdentityInterface;
use Magento\Framework\View\Element\Template;

class Review extends Template implements IdentityInterface
{
    protected $_coreRegistry;

    protected $_reviewsColFactory;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Review\Model\ResourceModel\Review\CollectionFactory $collectionFactory,
        array $data = []
    ) {
        $this->_coreRegistry = $registry;
        $this->_reviewsColFactory = $collectionFactory;
        parent::__construct($context, $data);

        $this->setTabTitle();
    }

    public function getProductId()
    {
        $product = $this->_coreRegistry->registry('product');
        return $product ? $product->getId() : null;
    }

    public function getProductReviewUrl()
    {
        return $this->getUrl(
            'review/product/listAjax',
            [
                '_secure' => $this->getRequest()->isSecure(),
                'id' => $this->getProductId(),
            ]
        );
    }

    public function setTabTitle()
    {
        $title = $this->getCollectionSize()
            ? __('Reviews %1', '<span class="counter">' . $this->getCollectionSize() . '</span>')
            : __('Reviews');
        $this->setTitle($title);
    }

    public function getCollectionSize()
    {
        $collection = $this->_reviewsColFactory->create()->addStoreFilter(
            $this->_storeManager->getStore()->getId()
        )->addStatusFilter(
            \Magento\Review\Model\Review::STATUS_APPROVED
        )->addEntityFilter(
            'product',
            $this->getProductId()
        );

        return $collection->getSize();
    }

    public function getIdentities()
    {
        return [\Magento\Review\Model\Review::CACHE_TAG];
    }
}