angular-docs-cn/public/docs/_examples/lifecycle-hooks/dart/lib/logger_service.dart

import 'dart:async';

import 'package:angular2/core.dart';

@Injectable()
class LoggerService {
  List<String> logs = [];

  log(String msg, [bool noTick = false]) {
    if (!noTick) {
      tick();
    }
    logs.add(msg);
  }

  clear() => logs.clear();

  tick() => new Future(() {});
}