Repository Pattern

Abstract data sources behind a clean interface

The repository pattern abstracts where data comes from. Your app talks to a repository, not directly to APIs or databases.

A repository abstracts data sources behind a clean interface. The rest of the app does not know if data comes from an API, database, or cache.

// Abstract interface
abstract class UserRepository {
  Future<User> getUser(int id);
  Future<List<User>> getAll();
  Future<void> save(User user);
  Future<void> delete(int id);
}

// Concrete implementation
class ApiUserRepository
  implements UserRepository {
  final ApiClient _client;

  @override
  Future<User> getUser(int id) =>
    _client.get('/users/$id');  
}

Architecture Layers

WidgetsBlocBuilder

BLoC

EventsStates

Repository

InterfaceCaching

Data Sources

APIDatabaseCache

UI -> BLoC -> Repository -> Data Source

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