sclass FixedRateTimer extends java.util.Timer implements AutoCloseable {
  *() { this(false); }
  *(bool daemon) { this(defaultTimerName(), daemon); }
  *(S name) { this(name, false); }
  *(S name, bool daemon) {
    super(name, daemon);
    _registerTimer(this);
  }
  
  L<Entry> entries = synchroList();
  
  srecord noeq Entry(TimerTask task, long firstTime, long period) {}
  
  // Note: not all methods overridden; only use these ones
  
  public void scheduleAtFixedRate(TimerTask task, long delay, long period) {
    entries.add(new Entry(task, now()+delay, period));
    super.scheduleAtFixedRate(task, delay, period);
  }
  
  public void cancel() {
    entries.clear();
    super.cancel();
  }
  
  public int purge() {
    entries.clear();
    ret super.purge();
  }
  
  FixedRateTimer changeRate(int newPeriod) {
    O r = ((SmartTimerTask) first(entries).task).r;
    cancel();
    ret doEvery(newPeriod, r);
  }
  
  close { cancel(); }
}