Android paging Network + Database 6 snippet

.kt

class MainViewModel(
    private val characterRepository: CharacterRepository
) : ViewModel() {


    private val listing: LiveData<Listing<CharacterModel>> by lazy {
        liveData(characterRepository.getListable())
    }

    private val boundaryCallback = switchMap(listing) { it.getBoundaryCallback() }!!
    val dataSource = switchMap(listing) { it.getDataSource() }!!
    val networkState = switchMap(listing) { it.getNetworkState() }!!

   /**
    * Retry all failed petitions boundary callback
    */
   fun retry() {
        boundaryCallback.value?.retryPetitions()
    }

    /**
     * Cleared all references and petitions boundary callback
     */
    override fun onCleared() {
        boundaryCallback.value?.cleared()
    }
}