Block.php

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<?php
namespace Magento\Cms\Block;

use Magento\Framework\View\Element\AbstractBlock;

class Block extends AbstractBlock implements \Magento\Framework\DataObject\IdentityInterface
{
    protected $_filterProvider;

    protected $_storeManager;

    protected $_blockFactory;

    public function __construct(
        \Magento\Framework\View\Element\Context $context,
        \Magento\Cms\Model\Template\FilterProvider $filterProvider,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Cms\Model\BlockFactory $blockFactory,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->_filterProvider = $filterProvider;
        $this->_storeManager = $storeManager;
        $this->_blockFactory = $blockFactory;
    }

    protected function _toHtml()
    {
        $blockId = $this->getBlockId();
        $html = '';
        if ($blockId) {
            $storeId = $this->_storeManager->getStore()->getId();
            $block = $this->_blockFactory->create();
            $block->setStoreId($storeId)->load($blockId);
            if ($block->isActive()) {
                $html = $this->_filterProvider->getBlockFilter()->setStoreId($storeId)->filter($block->getContent());
            }
        }
        return $html;
    }

    public function getIdentities()
    {
        return [\Magento\Cms\Model\Block::CACHE_TAG . '_' . $this->getBlockId()];
    }
}