GetFriendsUseCase.kt

class GetFriendsUseCase(
    private val friendsRepository: FriendsRepository
) : BaseUseCase<List<User>, GetFriendsUseCase.Params>() {

    override suspend fun run(params: Params): Either<Failure, List<User>> {
        return try {
            val friends = friendsRepository.getFriends(params.maxNumberOfFriends)
            Either.Right(friends)
        } catch (exp: Exception) {
            Either.Left(GetFriendsFailure(exp))
        }
    }

    data class Params(val maxNumberOfFriends: Int)

    data class GetFriendsFailure(val error: Exception) : Failure.FeatureFailure(error)
}