UpdateAttributesFlushCache.php

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<?php
namespace Magento\Catalog\Plugin\Model\Product\Action;

use Magento\Catalog\Model\Product\Action;
use Magento\Framework\Indexer\CacheContext;
use Magento\Framework\Event\ManagerInterface as EventManager;

class UpdateAttributesFlushCache
{
    protected $cacheContext;

    protected $eventManager;

    public function __construct(
        CacheContext $cacheContext,
        EventManager $eventManager
    ) {
        $this->cacheContext = $cacheContext;
        $this->eventManager = $eventManager;
    }

    public function afterUpdateAttributes(
        \Magento\Catalog\Model\Product\Action $subject,
        \Magento\Catalog\Model\Product\Action $result
    ) {
        $this->eventManager->dispatch('clean_cache_by_tags', ['object' => $this->cacheContext]);
        return $result;
    }

    public function afterUpdateWebsites(
        \Magento\Catalog\Model\Product\Action $subject
    ) {
        $this->eventManager->dispatch('clean_cache_by_tags', ['object' => $this->cacheContext]);
    }
}