code: public void notifyObserversOfRequestProgress(CachedSpiceRequest<?> request, RequestProgress requestProgress) {
          RequestProcessingContext requestProcessingContext = new RequestProcessingContext();
          requestProcessingContext.setExecutionThread(Thread.currentThread());
          requestProcessingContext.setRequestProgress(requestProgress);
          post(new RequestProgressNotifier(request, spiceServiceListenerList, requestProcessingContext));
      }
docs: Notify interested observers of request progress.
  @param request the request in progress.
  @param requestProgress the progress of the request.