protected function getFile($fileUri)
    {
        /* @var \oat\oatbox\filesystem\FileSystemService $fileSystemService */
        $fileSystemService     = $this->getServiceLocator()->get(\oat\oatbox\filesystem\FileSystemService::SERVICE_ID);
        $storageService        = $fileSystemService->getFileSystem(Queue::FILE_SYSTEM_ID);

        return $storageService->readStream($fileUri);
    }