code: private void trackWebSockets(final BundleContext bundleContext) {
  		final ServiceTracker<Object, WebSocketElement> webSocketTracker = WebSocketTracker.createTracker(extenderContext, bundleContext);
  		webSocketTracker.open();
  		trackers.add(0, webSocketTracker);
  	}
docs: Track WebSockets
  
  @param bundleContext the BundleContext associated with this bundle