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我有一个 android 应用程序，我想在其中实现 Kotlin Couroutines，我遇到的困惑是我在哪里使用协程。我有 viewModel 作为-

class PostViewModel : ViewModel() {

    var postPagedList: LiveData<PagedList<UnsplashImageDetails>>? = null
    private var postLiveDataSource: LiveData<PageKeyedDataSource<Int, UnsplashImageDetails>>? = null

    var popularPagedList: LiveData<PagedList<UnsplashImageDetails>>? = null
    private var popularLiveDataSource: LiveData<PageKeyedDataSource<Int, UnsplashImageDetails>>? = null

    init {
        val postDataSourceFactory = PostDataSourceFactory()
        val popularDataSourceFactory = PopularDataSourceFactory()

        postLiveDataSource = postDataSourceFactory.getPostLiveDataSource()
        popularLiveDataSource = popularDataSourceFactory.getPopularLiveDataSource()

        val config: PagedList.Config = (PagedList.Config.Builder()).setEnablePlaceholders(false)
            .setPageSize(PostDataSource().PAGE_SIZE).build()
        val configPop: PagedList.Config = (PagedList.Config.Builder()).setEnablePlaceholders(false)
            .setPageSize(PopularDataSource().PAGE_SIZE).build()

        postPagedList = LivePagedListBuilder(postDataSourceFactory, config).build()
        popularPagedList = LivePagedListBuilder(popularDataSourceFactory, configPop).build()
    }
}

我应该在哪里使用异步方法，在此活动中或在我通过改造获取数据的存储库类中。