code: @Override
      public void stop() {
  	log.debug("Stopping Master Clock");
  	if (currentTicker != null) {
  	    currentTicker.cancel();
  	    currentTicker = null;
  	}
  	if (timer != null) {
  	    timer.cancel();
  	    timer = null;
  	}
  
      }
docs: /* (non-Javadoc)
  @see com.github.thehilikus.jrobocom.timing.Clock#stop()