// while (running.get())
// {
// // always execute to keep timeline from "hanging behind" for too long
+// timeline.executeUntil(timeline.laterThan(System.currentTimeMillis()), System.currentTimeMillis() + 10);
// model.timeline.executeUpTo(System.currentTimeMillis(), System.currentTimeMillis() + 10);
// long sleepTime;
// if (model.timeline.hasNext())