SaveHandlerFactory.php

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<?php
namespace Magento\Framework\Indexer;

use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Indexer\SaveHandler\IndexerInterface as SaveHandlerInterface;

class SaveHandlerFactory
{
    protected $objectManager;

    public function __construct(ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function create($saveHandlerClass, $arguments = [])
    {
        $handler = $this->objectManager->create($saveHandlerClass, $arguments);
        if (!$handler instanceof SaveHandlerInterface) {
            throw new \InvalidArgumentException(
                $saveHandlerClass . ' doesn\'t implement \Magento\Framework\IndexerInterface'
            );
        }

        return $handler;
    }
}