build method

  1. @override
FutureOr<void> build(
  1. BuildTrigger trigger
)
override

Recalculates the state of the repository.

This method is called when:

Override this method to handle changes from said repositories.

Example:

class MyRepository extends Repository<MyState> {
  final OtherRepository _otherRepository;

  MyRepository(this._otherRepository) : super(MyState.new) {
    watch(_otherRepository);
  }

  @override
  FutureOr<void> build(BuildTrigger trigger) async {
    if(trigger is InitialBuildTrigger) {
      // Do something when the repository is first initialized
    }

    if(trigger is UpdateTrigger) {
      // Do something when the repository is updated
    }

    if(trigger is OtherRepository) {
      // Do something when the other repository emits a new state
    }
  }
}

Implementation

@override
FutureOr<void> build(BuildTrigger trigger) async {
  if (trigger is! InitialBuildTrigger) return;

  if (_state != null && isAuthenticated) {
    log('Global state present and user is authenticated, skipping storage check');
    return;
  }

  if (_state != null && !isAuthenticated) {
    log('Global state present, however user the is unauthenticated. Discarding state.');
    _state = null;
  }

  if (!await _localStorage.exists<Set<Token>>()) {
    log('No token found in storage');

    data({});

    return;
  }

  final tokens = await _localStorage.read<Set<Token>>();

  for (final token in tokens) {
    final valid = await _auth.verifyToken(token);

    if (!valid) {
      log('Token $token is invalid. Setting clearing state.');

      await logout();

      return;
    }
  }

  data(tokens);

  if (isAuthenticated) PostHog().enable();
}