fun listenUsernameChanges(){
   //Using RxJava
        sessionStore
                .flowable()
                .map { it.name }
                .subscribe { updateUsername(it) }

  // Custom callback
        sessionStore
                .observe { state -> updateUsername(state.name) }
}

fun login(username: String, password: String) {
        dispatcher.dispatch(LoginAction(username, password))
        sessionStore.flowable()
                .onNextTerminalState(taskMapFn = { it.loginTask },
                        successFn = { navigateToHome() },
                        failureFn = { showError(it) })
}