setChanged(); notifyObservers(START_EXPERIMENT_TIMER); }
  private void startNodes() {    Enumeration enum = this.nodeModels.keys();    while (enum.hasMoreElements()) {      Object key = enum.nextElement();      NodeModel model = (NodeModel) nodeModels.get(key);      if (model.getState().equals(NodeModel.STATE_RUNNING))        continue;      model.start();    }