findOrNullAsync<S> method

Future<S?> findOrNullAsync<S>({ String? tag, })

Asynchronously finds an instance of type S, returning null if not found.

• tag: An optional tag to specify the instance.

Implementation

Future<S?> findOrNullAsync<S>({String? tag}) async {
  final key = _getKey<S>(tag);

  // 1. Try Local
  final info = _registry[key];
  if (info != null) {
    return _findLocalAsync<S>(info as LevitDependency<S>, key, tag);
  }

  // 2. Try Cache
  final cachedScope = _resolutionCache[key];
  if (cachedScope != null) {
    return cachedScope.findOrNullAsync<S>(tag: tag);
  }

  // 3. Try Parent
  if (_parentScope != null) {
    final instance = await _parentScope!.findOrNullAsync<S>(tag: tag);
    if (instance != null) {
      _cacheScope(key, _parentScope!);
      return instance;
    }
  }

  return null;
}