private int getRowsToBeRendered() {
    if (isDataLoaded()) {
      if (dataProvider.getCurrentPage() == 0) {
        dataProvider.nextPage();
      }

      return dataProvider.getCurrentPageSize();
    }

    return 0;
  }
 @Override
 public void nextPage() {
   if (isDataLoaded()) {
     dataProvider.nextPage();
   }
 }