BackendFactory.php

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<?php
namespace TYPO3\CMS\Rsaauth\Backend;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class BackendFactory
{
    protected static $availableBackends = array(
        PhpBackend::class,
        CommandLineBackend::class
    );

    protected static $initialized = false;

    protected static $selectedBackend = null;

    public static function getBackend()
    {
        if (!self::$initialized) {
            // Backend does not exist yet. Create it.
            foreach (self::$availableBackends as $backend) {
                $backendObject = \TYPO3\CMS\Core\Utility\GeneralUtility::getUserObj($backend);
                // Check that it is derived from the proper base class
                if ($backendObject instanceof AbstractBackend) {
                    if ($backendObject->isAvailable()) {
                        // The backend is available, save it and stop the loop
                        self::$selectedBackend = $backendObject;
                        self::$initialized = true;
                        break;
                    }
                    // Attempt to force destruction of the object
                    unset($backendObject);
                }
            }
        }
        return self::$selectedBackend;
    }
}