Dagger2 Scope

# @Scope

 

@Scope //스코프임을 알린다.

@Retention(value = AnnotationRetention.RUNTIME) //이 주석은 런타임동안 유지된다.

annotation class ActivityScope

 

When a type is marked with a scope annotation, it can only be used by components that are annotated with the same scope.

@Scope라고 붙인 타입은 같은 스코프를 가진 컴포넌트에서만 사용될 수 있다.

 

When a component is marked with a scope annotation, it can only provide types with that annotation or types that have no annotation.

@Scope라고 붙인 컴포넌트는 같은 스코프를 가진 타입이나 아예 스코프 지정을 안한 타입만을 제공할 수 있다.

 

A subcomponent cannot use a scope annotation used by one of its parent components.

자식 컴포넌트는 부모컴포넌트에서 쓰인 스코프를 쓸 수 없다.

 

// Classes annotated with @ActivityScope are scoped to the graph and the same

// instance of that type is provided every time the type is requested

@ActivityScope

@Subcomponent

interface LoginComponent { ... }

 

// A unique instance of LoginViewModel is provided in Components

// annotated with @ActivityScope

@ActivityScope

class LoginViewModel @Inject constructor(

    private val userRepository: UserRepository

) { ... }