knmedium-5-presenter-actions.kt

interface PhotoActions {
    fun onRequestData()
}

class PhotoPresenter(
    uiContext: CoroutineContext,
    val view: PhotoView
) : CoroutinePresenter(uiContext, view), PhotoActions {

    val api: PhotoApi by kodein.instance("Api")

    override fun onRequestData() = updateData()
	
    private fun updateData() {
        // update view, show loader
        view.isUpdating = true
        
        GlobalScope.launch(coroutineContext) {
            // HTTP request, handle response. Errors will be handled via BaseView.showError(error: Throwable)
            val response = api.getRandom()
            view.onUpdate(response)
        }.invokeOnCompletion {
            // update view, hide loader
            view.isUpdating = false
        }
    }
}