ReindexQuoteInventoryObserver.php

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<?php
namespace Magento\CatalogInventory\Observer;

use Magento\Framework\Event\Observer as EventObserver;
use Magento\Framework\Event\ObserverInterface;

class ReindexQuoteInventoryObserver implements ObserverInterface
{
    protected $stockIndexerProcessor;

    protected $priceIndexer;

    protected $itemsForReindex;

    public function __construct(
        \Magento\CatalogInventory\Model\Indexer\Stock\Processor $stockIndexerProcessor,
        \Magento\Catalog\Model\Indexer\Product\Price\Processor $priceIndexer,
        ItemsForReindex $itemsForReindex
    ) {
        $this->stockIndexerProcessor = $stockIndexerProcessor;
        $this->priceIndexer = $priceIndexer;
        $this->itemsForReindex = $itemsForReindex;
    }

    public function execute(EventObserver $observer)
    {
        // Reindex quote ids
        $quote = $observer->getEvent()->getQuote();
        $productIds = [];
        foreach ($quote->getAllItems() as $item) {
            $productIds[$item->getProductId()] = $item->getProductId();
            $children = $item->getChildrenItems();
            if ($children) {
                foreach ($children as $childItem) {
                    $productIds[$childItem->getProductId()] = $childItem->getProductId();
                }
            }
        }

        if ($productIds) {
            $this->stockIndexerProcessor->reindexList($productIds);
        }

        // Reindex previously remembered items
        $productIds = [];
        foreach ($this->itemsForReindex->getItems() as $item) {
            $item->save();
            $productIds[] = $item->getProductId();
        }

        if (!empty($productIds)) {
            $this->priceIndexer->reindexList($productIds);
        }

        $this->itemsForReindex->clear();
        // Clear list of remembered items - we don't need it anymore
    }
}