code: public void setModified(boolean isModified)
    {
      _isModified = isModified;
  
      if (_isModified)
        _checkExpiresTime = Long.MAX_VALUE / 2;
      else
        _checkExpiresTime = CurrentTime.currentTime() + _checkInterval;
      
      if (! isModified)
        _isModifiedLog = false;
    }
docs: Sets the modified.