EngineResolver.php

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<?php
namespace Magento\Search\Model;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\Search\EngineResolverInterface;
use Psr\Log\LoggerInterface;

class EngineResolver implements EngineResolverInterface
{
    const CATALOG_SEARCH_MYSQL_ENGINE = 'mysql';

    protected $scopeConfig;

    protected $path;

    protected $scopeType;

    protected $scopeCode;

    private $engines = [];

    private $logger;

    public function __construct(
        ScopeConfigInterface $scopeConfig,
        array $engines,
        LoggerInterface $logger,
        $path,
        $scopeType,
        $scopeCode = null
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->path = $path;
        $this->scopeType = $scopeType;
        $this->scopeCode = $scopeCode;
        $this->engines = $engines;
        $this->logger = $logger;
    }

    public function getCurrentSearchEngine()
    {
        $engine = $this->scopeConfig->getValue(
            $this->path,
            $this->scopeType,
            $this->scopeCode
        );

        if (in_array($engine, $this->engines)) {
            return $engine;
        } else {
            $this->logger->error(
                $engine . ' search engine doesn\'t exists. Falling back to ' . self::CATALOG_SEARCH_MYSQL_ENGINE
            );
            return self::CATALOG_SEARCH_MYSQL_ENGINE;
        }
    }
}