static class DelayedUpdate {
  Runnable renderer;
  volatile long version;
  long lastUpdate; // AWT time
  int delay = 1000;
  
  *(Runnable *renderer) {}

  void trigger() {
    awt {
      awt_quickUpdate();
    }

    final long n = ++version;
    
    javax.swing.Timer timer = new javax.swing.Timer(delay, actionListener {
      awt_show(n);
    });
    timer.setRepeats(false);
    timer.start(); 
  }

  void awt_quickUpdate() {
    if (lastUpdate < now()-delay) {
      render();
      lastUpdate = now(); // This can be rough, no problem
    }
  }

  void awt_show(long n) {
    if (n == version) {
      render();
      lastUpdate = now();
    }
  }
  
  void render() {
    try {
      renderer.run();
    } catch (Throwable e) {
      e.printStackTrace();
    }
  }
}