class DownloadContext {

    public void stop() {
        if (started) OkDownload.with().downloadDispatcher().cancel(tasks);
        started = false;
    }

      DownloadContext(@NonNull DownloadTask[] tasks,
                    @Nullable DownloadContextListener contextListener,
                    @NonNull QueueSet set,
                    @NonNull Handler uiHandler);
      DownloadContext(@NonNull DownloadTask[] tasks,
                    @Nullable DownloadContextListener contextListener,
                    @NonNull QueueSet set);

}