public synchronized void clear() {
    super.clear();

    executionError.set(0);
    fatalError.set(0);
    if (flowStatistics != null) {
      flowStatistics.clear();
    }
  }
 /** Enable statistics logs (this is a dynamic parameter) */
 public synchronized void setEnabled(boolean b) {
   super.setEnabled(b);
   flowStatistics.setEnabled(enabled);
 }