CacheFlush.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryCache\Plugin\InventoryIndexer\Indexer\Stock\StockIndexer;

use Magento\InventoryCache\Model\FlushCacheByProductIds;
use Magento\InventoryCache\Model\ResourceModel\GetProductIdsByStockIds;
use Magento\InventoryIndexer\Indexer\Stock\StockIndexer;

class CacheFlush
{
    private $flushCacheByProductIds;

    private $getProductIdsByStockIds;

    public function __construct(
        FlushCacheByProductIds $flushCacheByProductIds,
        GetProductIdsByStockIds $getProductIdsForCacheFlush
    ) {
        $this->flushCacheByProductIds = $flushCacheByProductIds;
        $this->getProductIdsByStockIds = $getProductIdsForCacheFlush;
    }

    public function aroundExecuteList(StockIndexer $subject, callable $proceed, array $stockIds)
    {
        $beforeReindexProductIds = $this->getProductIdsByStockIds->execute($stockIds);
        $proceed($stockIds);
        $afterReindexProductIds = $this->getProductIdsByStockIds->execute($stockIds);
        $productIdsForCacheClean = array_diff($beforeReindexProductIds, $afterReindexProductIds);
        if ($productIdsForCacheClean) {
            $this->flushCacheByProductIds->execute($productIdsForCacheClean);
        }
    }
}