StockFactory.php

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<?php
namespace Magento\CatalogInventory\Model\ResourceModel\Indexer;

class StockFactory
{
    protected $_objectManager;

    protected $_defaultIndexer = \Magento\CatalogInventory\Model\ResourceModel\Indexer\Stock\DefaultStock::class;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager)
    {
        $this->_objectManager = $objectManager;
    }

    public function create($indexerClassName = '', array $data = [])
    {
        if (empty($indexerClassName)) {
            $indexerClassName = $this->_defaultIndexer;
        }
        $indexer = $this->_objectManager->create($indexerClassName, $data);
        if (false == $indexer instanceof \Magento\CatalogInventory\Model\ResourceModel\Indexer\Stock\StockInterface) {
            throw new \InvalidArgumentException(
                $indexerClassName .
                ' doesn\'t implement \Magento\CatalogInventory\Model\ResourceModel\Indexer\Stock\StockInterface'
            );
        }
        return $indexer;
    }
}