Executing bundle of functions by their metadata tag in Dart lang

Question

Building on this, I want to write a code that run A:: the functions refeed by the same metadata tag.

I tunes the codes of the previous thread as below:<

Answer 1

@MirrorsUsed(metaTargets: Tag)
import 'dart:mirrors';

class Tag {
  final Symbol name;
  const Tag(this.name);
}
List getMirrorsByTag(Symbol name) {
  List res = new List();
  MirrorSystem ms = currentMirrorSystem();
  ms.libraries.forEach((u, lm) {
    lm.declarations.forEach((s, dm) {
      dm.metadata.forEach((im) {
        if ((im.reflectee is Tag) && im.reflectee.name == name) {
          res.add(dm);
        }
      });
    });
  });
  return res;
}

@Tag(#foo)
printa() => print('a');

@Tag(#foo)
printb() => print('b');


void main() {
  getMirrorsByTag(#foo).forEach((MethodMirror me) {
    LibraryMirror owner = me.owner;
    owner.invoke(me.simpleName, []);
  });
}