FlushCacheByProductIds.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryCache\Model;

use Magento\Framework\EntityManager\EventManager;
use Magento\Framework\Indexer\CacheContext;

class FlushCacheByProductIds
{
    private $cacheContext;

    private $eventManager;

    private $productCacheTag;

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

    public function execute(array $productIds)
    {
        if ($productIds) {
            $this->cacheContext->registerEntities($this->productCacheTag, $productIds);
            $this->eventManager->dispatch('clean_cache_by_tags', ['object' => $this->cacheContext]);
        }
    }
}