IndexerHandlerFactory.php

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<?php
namespace Magento\CatalogSearch\Model\Indexer;

use Magento\Framework\Indexer\SaveHandler\IndexerInterface;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Search\EngineResolverInterface;

class IndexerHandlerFactory
{
    protected $_objectManager = null;

    protected $handlers = null;

    private $engineResolver;

    public function __construct(
        ObjectManagerInterface $objectManager,
        EngineResolverInterface $engineResolver,
        array $handlers = []
    ) {
        $this->_objectManager = $objectManager;
        $this->handlers = $handlers;
        $this->engineResolver = $engineResolver;
    }

    public function create(array $data = [])
    {
        $currentHandler = $this->engineResolver->getCurrentSearchEngine();
        if (!isset($this->handlers[$currentHandler])) {
            throw new \LogicException(
                'There is no such indexer handler: ' . $currentHandler
            );
        }
        $indexer = $this->_objectManager->create($this->handlers[$currentHandler], $data);

        if (!$indexer instanceof IndexerInterface) {
            throw new \InvalidArgumentException(
                $currentHandler . ' indexer handler doesn\'t implement ' . IndexerInterface::class
            );
        }

        if ($indexer && !$indexer->isAvailable()) {
            throw new \LogicException(
                'Indexer handler is not available: ' . $currentHandler
            );
        }
        return $indexer;
    }
}