FileStorageIndexingTask.php

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<?php
namespace TYPO3\CMS\Scheduler\Task;

class FileStorageIndexingTask extends \TYPO3\CMS\Scheduler\Task\AbstractTask {

    public $storageUid = -1;

    public function execute() {
        if ((int)$this->storageUid > 0) {
            $storage = \TYPO3\CMS\Core\Resource\ResourceFactory::getInstance()->getStorageObject($this->storageUid);
            $storage->setEvaluatePermissions(FALSE);
            $indexer = $this->getIndexer($storage);
            $indexer->processChangesInStorages();
            $storage->setEvaluatePermissions(TRUE);
        }
        return TRUE;
    }

    protected function getIndexer(\TYPO3\CMS\Core\Resource\ResourceStorage $storage) {
        return \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Resource\\Index\\Indexer', $storage);
    }

}