Javafx滑块在媒体之前结束

Question

我有一个可以每秒更新滑块位置的runnable，但是滑块在它应该控制的媒体之前到达终点。如何设置它以便在同一时间结束？

executorService.scheduleAtFixedRate(new UpdateRunnable(mediaPlayer), 0L, 1L, TimeUnit.SECONDS);

 private final class UpdateRunnable implements Runnable {

    private final MediaPlayer mediaPlayer;

    private UpdateRunnable(MediaPlayer mediaPlayer) {
        this.mediaPlayer = mediaPlayer;
    }

    @Override
    public void run() {
        if(!mediaPlayer.isPlaying())
        {
            System.out.println("Not playing");
            return;
        }  
        final long time = this.mediaPlayer.getTime();
        final int position = (int)(this.mediaPlayer.getPosition() * 1000.0f);

        mediaPlayer.addMediaPlayerEventListener(new MediaPlayerEventAdapter() {
        @Override
        public void positionChanged(MediaPlayer mediaPlayer, float newPosition) {
            currentPosition = newPosition;
        }
        });

        time_counter++;
        System.out.println("New Position is " + currentPosition);
        System.out.println("New time is " + time_counter);
        // Updates to user interface components must be executed on the Event
        // Dispatch Thread
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                if(mediaPlayer.isPlaying()) {
                    //System.out.println("time = " + time);
                    updateTime(time);
                    updatePosition(position);
                }
            }
        });
    }
}

private void updatePosition(int value) {
    timeSlider.setValue(value);
}

无论如何，我如何根据正在播放的媒体长度设置滑块的长度？