CheckItemsQuantity.php

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<?php
declare(strict_types=1);

namespace Magento\InventorySales\Model;

use Magento\Framework\Exception\LocalizedException;
use Magento\InventorySalesApi\Api\IsProductSalableForRequestedQtyInterface;
use Magento\InventorySalesApi\Api\Data\ProductSalableResultInterface;
use Magento\InventorySalesApi\Api\Data\ProductSalabilityErrorInterface;

class CheckItemsQuantity
{
    private $isProductSalableForRequestedQty;

    public function __construct(
        IsProductSalableForRequestedQtyInterface $isProductSalableForRequestedQty
    ) {
        $this->isProductSalableForRequestedQty = $isProductSalableForRequestedQty;
    }

    public function execute(array $items, int $stockId) : void
    {
        foreach ($items as $sku => $qty) {
            $isSalable = $this->isProductSalableForRequestedQty->execute((string)$sku, $stockId, (float)$qty);
            if (false === $isSalable->isSalable()) {
                $errors = $isSalable->getErrors();
                $errorMessage = array_pop($errors);
                throw new LocalizedException(__($errorMessage->getMessage()));
            }
        }
    }
}