executeGitHubLogin.kt

fun executeGitHubLogin(action: LoginAction, dispatch: DispatchFunction) {
    val loginTaskListenerMiddleware = LoginTaskListenerMiddleware()
    val authTask = UserLoginTask(loginTaskListenerMiddleware,
            action.userName,
            action.password )
    authTask.execute()
    dispatch(LoginStartedAction(action.userName))
}

interface LoginTaskListenerInterface {
    fun onFinished(result: LoginCompletedAction,store: Store<StateType>)
}

class LoginTaskListenerMiddleware : LoginTaskListenerInterface {
    override fun onFinished(result: LoginCompletedAction, store: Store<StateType>) {
      if (result.loginStatus == LoggedInState.loggedIn ) {
            result.token?.let {
               // Login succeed, do the next work
            }
        } else {
            result.message?.let{
               // Login failed, show an error message
            }
        }
    }
}