dart_mock/lib/person_data_access_map.dart

import 'person.dart';

class PersonDataAccessMap {
  final Map<int, Person> _persons = {};

  void store(Person p) => _persons[p.id] = p;

  Person? retrieve(int personId) => _persons[personId];

  List<Person> retrieveAll() => _persons.values.toList();

  void close() {}
}