code: @Override
    public void onInterest(Name prefix, Interest interest, Face face, long interestFilterId, InterestFilter filter){
      try {
        Data data = callback.onInterest(prefix, interest);
        data = processPipeline(data);
        face.putData(data);
      } catch (Exception e) {
        logger.log(Level.FINE, "Failed to send data for: " + interest.toUri(), e);
      }
    }
docs: {@inheritDoc}