# 17. Implement Linux state management (GObject signals)

meta:
  id: native-business-logic-migration-17
  feature: native-business-logic-migration
  priority: P0
  depends_on: [native-business-logic-migration-14]
  tags: [implementation, linux, state-management]

objective:
- Implement reactive state management using GObject signals

deliverables:
- feed-repository.vala
- subscription-repository.vala
- feed-view-model.vala
- subscription-view-model.vala
- State enumeration
- Error handling types

tests:
- Unit: Test repository methods
- Unit: Test ViewModel state transitions
- Unit: Test signal emission
- Integration: Test UI updates

acceptance_criteria:
- Repositories emit signals on changes
- ViewModels manage state properly
- Error states handled
- Loading states implemented
- Proper signal connections

validation:
- Run `meson test -C build`
- Test signal connections

notes:
- Use GObject properties with notify signals
- Follow GNOME HIG
- Use Gio for async operations