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https://github.com/KokaKiwi/BarInsta
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Add username check to prevent unnecessary fetch in ProfileFragmentViewModel
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0d35f37bbc
commit
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@ -49,6 +49,8 @@ class ProfileFragmentViewModel(
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private val profileAction = MutableLiveData(INIT)
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private val profileAction = MutableLiveData(INIT)
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private val _eventLiveData = MutableLiveData<Event<ProfileEvent>?>()
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private val _eventLiveData = MutableLiveData<Event<ProfileEvent>?>()
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private var previousUsername: String? = null
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enum class ProfileAction {
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enum class ProfileAction {
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INIT,
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INIT,
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REFRESH,
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REFRESH,
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@ -98,8 +100,9 @@ class ProfileFragmentViewModel(
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val profile: LiveData<Resource<User?>> = currentUserStateUsernameActionLiveData.switchMap {
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val profile: LiveData<Resource<User?>> = currentUserStateUsernameActionLiveData.switchMap {
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val (currentUserResource, stateUsernameResource, action) = it
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val (currentUserResource, stateUsernameResource, action) = it
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liveData<Resource<User?>>(context = viewModelScope.coroutineContext + ioDispatcher) {
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liveData<Resource<User?>>(context = viewModelScope.coroutineContext + ioDispatcher) {
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if (action == INIT && previousUsername != null && stateUsernameResource.data == previousUsername) return@liveData
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if (currentUserResource.status == Resource.Status.LOADING || stateUsernameResource.status == Resource.Status.LOADING) {
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if (currentUserResource.status == Resource.Status.LOADING || stateUsernameResource.status == Resource.Status.LOADING) {
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emit(Resource.loading(null))
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emit(Resource.loading(profileCopy.value?.data))
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return@liveData
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return@liveData
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}
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}
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val currentUser = currentUserResource.data
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val currentUser = currentUserResource.data
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@ -111,6 +114,7 @@ class ProfileFragmentViewModel(
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try {
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try {
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when (action) {
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when (action) {
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INIT, REFRESH -> {
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INIT, REFRESH -> {
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previousUsername = stateUsername
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val fetchedUser = profileFetchControlledRunner.cancelPreviousThenRun { fetchUser(currentUser, stateUsername) }
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val fetchedUser = profileFetchControlledRunner.cancelPreviousThenRun { fetchUser(currentUser, stateUsername) }
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emit(Resource.success(fetchedUser))
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emit(Resource.success(fetchedUser))
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if (fetchedUser != null) {
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if (fetchedUser != null) {
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