PeopleListPresenter#impl.kt

class PeopleListPresenter(private val repository: Repository<Person>) : PeopleListContract.Presenter {

    var view: PeopleListContract.View? = null

    override fun attach(view: PeopleListContract.View) {
        this.view = view
        loadPeople()
    }

    private fun loadPeople() {
            repository.getAll()
                    .doOnSubscribe { view?.showLoading() }
                    .doOnError {
                        view?.apply {
                            showError(it)
                            hideLoading()
                        }
                    }
                    .doOnSuccess {
                        view?.apply {
                            addPeople(it)
                            hideLoading()
                        }
                    }
                    .subscribe()
        }
}