启动后台任务时附加观察者的正确顺序

在片段或活动中,设置观察者与启动数据生产者之间是否有推荐的顺序?

例如,假设没有其他人正在获取数据或进行观察,那么:

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
 ): View? {

    // OPTION A: this seems bullet-proof. Setup the observer first, 
    //  then trigger the generation of the data...
    // ----------------------------------------------------------
    // 1) setup observer
    mainViewModel.myResponse.observe(viewLifecycleOwner, { response -> {...} })

    // 2) initiate data fetching
    mainViewModel.generateFetchInBackground()

    // OPTION B: this is what I sometimes see done. This seems like
    //   a race condition since the triggering of generation happens
    //   first, then the observer is established...
    // ----------------------------------------------------------
    // 1) initiate data fetching
    mainViewModel.generateFetchInBackground()        
    
    // 2) setup observer
    mainViewModel.myResponse.observe(viewLifecycleOwner, { response -> {...} })

}