private void onFileChanged(boolean isLengthIncreased) {
    try {
      long pagesAmount = getPagesAmount();
      Page lastPage = getPage_wait(pagesAmount - 1);
      for (FileChangeListener listener : myFileChangeListeners) {
        listener.onFileChanged(lastPage, isLengthIncreased);
      }
    }
    catch (IOException e) {
      logger.warn(e);
    }
  }
private void onFileChanged(boolean isLengthIncreased)