Dagger DI

[AlexisTercero55]

Dagger DI

1. Dagger Dependency Injection: Component Dependency & Scoped Orchestration

We will implement a Pure Dagger architecture using Component Dependencies to maintain strict module encapsulation and explicit lifecycle control.

1.1 Multi-Module Component Topology

To preserve the "Clean Architecture" boundaries, we avoid Subcomponents and instead use Component Dependencies.

• CoreComponent (in :core:data):
  • Scope: @Singleton.
  • Exposure: Explicitly exposes AuthRepository, SessionManager, and Json infrastructure.
  • Responsibility: Houses stateless or global-state services.
• UserComponent (in :app or :core:data) [NEW]:
  • Scope: @UserScope.
  • Dependency: CoreComponent.
  • Lifetime: Created upon successful login; invalidated immediately upon logout.
  • Responsibility: Hosts session-sensitive interactors and transient state for flows like Loan Wizards.
• FeatureComponents (in :features:*):
  • Dependency: CoreComponent (and UserComponent for authenticated features).
  • Responsibility: Provides feature-specific ViewModels via multibinding.

1.2 Scoped Component Management

We will implement a ComponentManager at the :app level to orchestrate the lifecycle of the UserComponent. This ensures that when a user logs out, the entire session-scoped graph is garbage collected, fulfilling fintech requirements for Secure Session Isolation.

1.3 ViewModel Multibinding & Factory

• Implement a DaggerViewModelFactory in :core:ui that leverages a Map<Class<? extends ViewModel>, Provider<ViewModel>>.
• Use @IntoMap and @ViewModelKey in feature modules to decouple the UI from the instantiation of business logic.

Phase 1: Environment & Core DI Infrastructure

1. Dependency Injection & Firebase Setup: Update libs.versions.toml with Dagger 2, Firebase BOM, and DataStore dependencies. Apply plugins and dependencies to all module build.gradle.kts files.
2. Annotation Definition: Create @UserScope and @ViewModelKey in :core:domain or :core:ui.
3. Core Data Module: Create CoreModule and CoreComponent in :core:data to provide Json and basic infrastructure.
4. ViewModel Factory: Implement DaggerViewModelFactory in :core:ui.

Phase 3: Feature & App Layer Integration

1. Feature Multibinding: Annotate LoginViewModel and HomeViewModel with @Inject and register them in their respective Dagger modules using @IntoMap.
2. UserComponent Orchestration: Implement the ComponentManager in :app to manage the lifecycle of the @UserScope graph.
3. Application & Activity Wiring: Initialize the Dagger graph in RhoApplication.kt and trigger injection in MainActivity.kt.

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Rho.Studio® - Engineering Department - Contact alexis.tercero@rho.studio