IndexSwitcherProxy.php

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

use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Search\EngineResolverInterface;

class IndexSwitcherProxy implements IndexSwitcherInterface
{
    private $objectManager = null;

    private $handlers;

    private $engineResolver;

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

    public function switchIndex(array $dimensions)
    {
        $currentHandler = $this->engineResolver->getCurrentSearchEngine();
        if (!isset($this->handlers[$currentHandler])) {
            return;
        }
        $this->create($currentHandler)->switchIndex($dimensions);
    }

    private function create($handler)
    {
        $indexSwitcher = $this->objectManager->create($this->handlers[$handler]);

        if (!$indexSwitcher instanceof IndexSwitcherInterface) {
            throw new \InvalidArgumentException(
                $handler . ' index switcher doesn\'t implement ' . IndexSwitcherInterface::class
            );
        }

        return $indexSwitcher;
    }
}