UpdateSourceItemsUponConfigChangeObserver.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryCatalogAdminUi\Observer;

use Magento\Framework\Event\Observer as EventObserver;
use Magento\Framework\Event\ObserverInterface;
use Magento\InventoryIndexer\Indexer\InventoryIndexer;
use Magento\Framework\Indexer\IndexerRegistry;

class UpdateSourceItemsUponConfigChangeObserver implements ObserverInterface
{
    private $indexerRegistry;

    public function __construct(IndexerRegistry $indexerRegistry)
    {
        $this->indexerRegistry = $indexerRegistry;
    }

    public function execute(EventObserver $observer)
    {
        $indexer = $this->indexerRegistry->get(InventoryIndexer::INDEXER_ID);
        if ($indexer->isValid()) {
            $indexer->invalidate();
        }
    }
}