@Override
 public void removeExecutionListener(
     final ExecutionListener listener, final ExecutionEventType... eventTypes) {
   globalEventQueue.removeListener(this, listener, eventTypes);
 }
 @Override
 public void removeListener(
     Engine engine, ExecutionListener listener, ExecutionEventType... eventTypes) {
   initEventQueue(engine);
   eventQueue.removeListener(engine, listener, eventTypes);
 }