@Override
 public void setup(Context.OperatorContext context) {
   super.setup(context);
   timeIncrement =
       context.getValue(Context.OperatorContext.APPLICATION_WINDOW_COUNT)
           * context.getValue(Context.DAGContext.STREAMING_WINDOW_SIZE_MILLIS);
 }
 @Override
 public void endWindow() {
   super.endWindow();
   time += timeIncrement;
 }