BackendFactory.php

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

class BackendFactory {

    static protected $availableBackends = array(
        'TYPO3\\CMS\\Rsaauth\\Backend\\PhpBackend',
        'TYPO3\\CMS\\Rsaauth\\Backend\\CommandLineBackend'
    );

    static protected $initialized = FALSE;

    static protected $selectedBackend = NULL;

    static public 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 ($backendObject instanceof \TYPO3\CMS\Rsaauth\Backend\AbstractBackend) {
                    if ($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;
    }

}