public void downloadFiles(List<String> filenames, final String fileSavePath) {
    if (filenames != null && filenames.size() > 0) {
        List<Callable<Void>> jobs = new ArrayList();
        for (final String fileName : filenames) {
            jobs.add(new Callable() {
                public Void call() throws Exception {
                    downloadFile(fileName, fileSavePath);
                    return null;
                }
            });
        }
        performJobs(jobs);
    }
}