code: protected void stopScan(Context context) {
  		log.debug("Access Control stop on Context: " + context);
  		threadManager.getScannerThread(context.getIndex()).stopScan();
  	}
docs: Method called when the stop button is pressed. Base implementation forward the calls to the
  Scanner Thread that corresponds to the provided Context and obtained via the Thread Manager
  specified in the constructor.
  @param context the context whose scan should be stopped