code: public void setRolloverCheckPeriod(long period)
    {
      if (period > 1000)
        _rolloverCheckPeriod = period;
      else if (period > 0)
        _rolloverCheckPeriod = 1000;
      
      if (DAY < _rolloverCheckPeriod) {
        log.info(this + " rollover-check-period "
                 + _rolloverCheckPeriod + "ms is longer than 24h");
        
        _rolloverCheckPeriod = DAY;
      }
    }
docs: Sets how often the log rollover will be checked.
  
  @param period how often the log rollover will be checked.