1. @override
Future onInvoke(Map<String, dynamic> params)

This is called when this node is invoked. You can return the following types from this method:

  • Iterable
  • Map
  • Table
  • Stream
  • SimpleTableResult
  • AsyncTableResult

You can also return a future that resolves to one (like if the method is async) of the following types:

  • Stream
  • Iterable
  • Map
  • Table

Source 

@override
onInvoke(Map<String, dynamic> params) async {
  String name = params["Name"];
  String realName = NodeNamer.createName(name);

  var p = new Path(path);

  _link.addNode("${p.parentPath}/${realName}", {
    r"$is": "watchGroup",
    r"$name": name
  });
  _link.save();
}