i have a suspendCancellableCoroutine as an animation listener extension, but its crashing on api 30, heres the extension
suspend fun Animator.startAndWait() = suspendCancellableCoroutine<Unit> { continuation ->
continuation.invokeOnCancellation { cancel() }
this.addListener(object : AnimatorListenerAdapter() {
private var endedSuccessfully = true
override fun onAnimationCancel(animation: Animator?) {
endedSuccessfully = false
}
override fun onAnimationStart(animation: Animator?) {
animation?.removeListener(this)
if (continuation.isActive) {
// If the coroutine is still active...
if (endedSuccessfully) {
// ...and the Animator ended successfully, resume the coroutine
continuation.resume(Unit)
} else {
// ...and the Animator was cancelled, cancel the coroutine too
continuation.cancel()
}
}
}
})
start()
}
I'm calling it from the run method of another animator
private fun createRevealAnimation() {
val x: Int = binding.root.right / 2
val y: Int = binding.root.bottom - binding.root.bottom / 9
val endRadius = hypot(binding.root.width.toDouble(), binding.root.height.toDouble()).toInt()
viewLifecycleOwner.lifecycleScope.launch(Dispatchers.Default) {
createCircleRevealAnimator(x, y, endRadius).run {
duration = 250
withContext(Dispatchers.Main){
binding.pokeballOpen.visibility = View.VISIBLE
}
startAndWait()
navigateToListFragment()
}
}
}
private fun createCircleRevealAnimator(x: Int, y: Int, endRadius: Int): Animator {
return ViewAnimationUtils.createCircularReveal(
binding.pokeballOpen, x, y,
0f,
endRadius.toFloat()
)
}
it works fine on every version up until api 30 wheres it crashes and throws this error
2021-02-06 17:50:42.205 29495-29590/com.sealstudios.pokemonApp.paid E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-1
Process: com.sealstudios.pokemonApp.paid, PID: 29495
kotlinx.coroutines.CompletionHandlerException: Exception in invokeOnCancellation handler for CancellableContinuation(DispatchedContinuation[Dispatchers.Default, Continuation at com.sealstudios.pokemonApp.ui.SplashScreenFragment$createRevealAnimation$1.invokeSuspend(SplashScreenFragment.kt:61)#472a1ed]){CancelledContinuation[kotlinx.coroutines.JobCancellationException: StandaloneCoroutine is cancelling; job=StandaloneCoroutine{Cancelling}#c735822]}#e4312b3
at kotlinx.coroutines.CancellableContinuationImpl.callCancelHandler(CancellableContinuationImpl.kt:583)
at kotlinx.coroutines.CancellableContinuationImpl.cancel(CancellableContinuationImpl.kt:195)
at kotlinx.coroutines.CancellableContinuationImpl.parentCancelled$kotlinx_coroutines_core(CancellableContinuationImpl.kt:205)
at kotlinx.coroutines.ChildContinuation.invoke(JobSupport.kt:1484)
at kotlinx.coroutines.JobSupport.notifyCancelling(JobSupport.kt:1511)
at kotlinx.coroutines.JobSupport.tryMakeCompletingSlowPath(JobSupport.kt:897)
at kotlinx.coroutines.JobSupport.tryMakeCompleting(JobSupport.kt:860)
at kotlinx.coroutines.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:825)
at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:111)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:738)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
Caused by: java.lang.IllegalStateException: The current thread must have a looper!
at android.view.Choreographer$1.initialValue(Choreographer.java:111)
at android.view.Choreographer$1.initialValue(Choreographer.java:106)
at java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:180)
at java.lang.ThreadLocal.get(ThreadLocal.java:170)
at android.view.Choreographer.getInstance(Choreographer.java:288)
at android.graphics.animation.RenderNodeAnimator$DelayedAnimationHelper.<init>(RenderNodeAnimator.java:431)
at android.graphics.animation.RenderNodeAnimator.getHelper(RenderNodeAnimator.java:415)
at android.graphics.animation.RenderNodeAnimator.cancel(RenderNodeAnimator.java:226)
at com.sealstudios.pokemonApp.ui.listenerExtensions.AnimatorListenersKt$startAndWait$$inlined$suspendCancellableCoroutine$lambda$1.invoke(AnimatorListeners.kt:12)
at com.sealstudios.pokemonApp.ui.listenerExtensions.AnimatorListenersKt$startAndWait$$inlined$suspendCancellableCoroutine$lambda$1.invoke(Unknown Source:2)
at kotlinx.coroutines.InvokeOnCancel.invoke(CancellableContinuationImpl.kt:539)
at kotlinx.coroutines.CancellableContinuationImpl.callCancelHandler(CancellableContinuationImpl.kt:230)
at kotlinx.coroutines.CancellableContinuationImpl.cancel(CancellableContinuationImpl.kt:195)
at kotlinx.coroutines.CancellableContinuationImpl.parentCancelled$kotlinx_coroutines_core(CancellableContinuationImpl.kt:205)
at kotlinx.coroutines.ChildContinuation.invoke(JobSupport.kt:1484)
at kotlinx.coroutines.JobSupport.notifyCancelling(JobSupport.kt:1511)
at kotlinx.coroutines.JobSupport.tryMakeCompletingSlowPath(JobSupport.kt:897)
at kotlinx.coroutines.JobSupport.tryMakeCompleting(JobSupport.kt:860)
at kotlinx.coroutines.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:825)
at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:111)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:738)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
any one have any ideas I'm pretty lost with this one.
Remove Dispatchers.Default
viewLifecycleOwner.lifecycleScope.launch { ... }
Related
The peculiarity of this application is that every time a user does something (except common things like typing) the application must check with an authority that they are indeed allowed to perform that action.
For example, let us say that the user wishes to see their profile (which is on the top bar)
the Composable screen looks something like this:
#Composable
fun HomeScreen(
navController: NavController,
vm: HomeViewModel = hiltViewModel()
) {
val state = vm.state.value
val scaffoldState = rememberScaffoldState()
HomeScreen(state, scaffoldState, vm::process)
}
#Composable
fun HomeScreen(state: HomeState, scaffoldState: ScaffoldState, event: (HomeEvent) -> Unit) {
Scaffold(
scaffoldState = scaffoldState,
modifier = Modifier.fillMaxSize(),
topBar = {
TopAppBar(
title = {
Text("Hello world")
},
actions = {
IconButton(onClick = {
event.invoke(HomeEvent.ShowProfile)
}) {
Icon(
painter = painterResource(id = R.drawable.ic_person),
contentDescription = stringResource(id = R.string.profile)
)
}
}
)
}
) {
}
}
the view model receives it like so:
#HiltViewModel
class HomeViewModel #Inject constructor(app: Application, private val checkAllowed: CheckAllowed): AndroidViewmodel(app) {
val state = mutableStateOf(HomeState.Idle)
fun process(event:HomeEvent) {
when(event) {
HomeEvent.ShowProfile -> {
state.value = HomeState.Loading
viewModelScope.launch {
try {
val allowed = checkAllowed(Permission.SeeProfile) //use case that checks if the action is allowed
if (allowed) {
} else {
}
} finally {
state.value = HomeState.Idle
}
}
}
}
}
}
I now have to send a command to the ui, to either show a snackbar with the error or navigate to the profile page.
I have read a number of articles saying that compose should have a state, and the correct way to do this is make a new state value, containing the response, and when the HomeScreen receives it , it will act appropriately and send a message back that it is ok
I assume something like this :
in the viewmodel
val command = mutableStateOf<HomeCommand>(HomeCommand.Idle)
fun commandExecuted() {
command.value = HomeCommand.Idle
}
and inside the HomeScreen
val command = vm.command.value
try {
when (command) {
is HomeCommand.ShowProfile -> navController.navigate("profile_screen")
is HomeCommand.ShowSnackbar -> scaffoldState.snackbarHostState.showSnackbar(command.message, "Dismiss", SnackbarDuration.Indefinite)
}
}finally {
vm.commandExecuted()
}
but the way I did it is using flows like so:
inside the viewmodel:
private val _commands = MutableSharedFlow<HomeCommand>(0, 10, BufferOverflow.DROP_LATEST)
val commands: Flow<HomeCommand> = _commands
and inside the HomeScreen:
LaunchedEffect(key1 = vm) {
this#ExecuteCommands.commands.collectLatest { command ->
when (command) {
is HomeCommand.ShowProfile -> navController.navigate("profile_screen")
is HomeCommand.ShowSnackbar -> scaffoldState.snackbarHostState.showSnackbar(command.message, "Dismiss", SnackbarDuration.Indefinite)
}
}
This seems to work, but I am afraid there may be a memory leak or something I'm missing that could cause problems
Is my approach correct? Should I change it to state as in the first example? can I make it better somehow?
I think that the problem is I don't know to use well the Coroutines. In Maps Activity you'll see that I access to a PointsDao suspend function that returns a List of objects that I want to use to create marks at my Google Maps Activity.
#AndroidEntryPoint
class MapsActivity : AppCompatActivity(), OnMapReadyCallback {
private lateinit var mMap: GoogleMap
private lateinit var binding: ActivityMapsBinding
private lateinit var requestPermissionLauncher: ActivityResultLauncher<Array<String>>
private val permissions = arrayOf(Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION)
private lateinit var fusedLocationClient: FusedLocationProviderClient
private val mapsViewModel: MapsViewModel by viewModels()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMapsBinding.inflate(layoutInflater)
setContentView(binding.root)
requestPermissionLauncher = registerForActivityResult(
ActivityResultContracts.RequestMultiplePermissions()
) {
permissions ->
if (permissions.getOrDefault(Manifest.permission.ACCESS_FINE_LOCATION, false)) {
Log.d("fine_location", "Permission granted")
} else {
Log.d("fine_location", "Permission not granted")
getBackToMainActivity()
Toast.makeText(this, "Necessites acceptar els permisos de geolocalització per a realitzar la ruta", Toast.LENGTH_LONG).show()
}
if (permissions.getOrDefault(Manifest.permission.ACCESS_COARSE_LOCATION, false)) {
Log.d("coarse_location", "Permission granted")
} else {
Log.d("coarse_location", "Permission not granted")
getBackToMainActivity()
Toast.makeText(this, "Necessites acceptar els permisos de geolocalització per a realitzar la ruta", Toast.LENGTH_LONG).show()
}
}
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
val mapFragment = supportFragmentManager
.findFragmentById(R.id.map) as SupportMapFragment
mapFragment.getMapAsync(this)
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
requestLocationPermissions()
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera.
*/
override fun onMapReady(googleMap: GoogleMap) {
mMap = googleMap
CoroutineScope(Dispatchers.Main).launch {
val listOfPoints = getRoutePoints()
for (point in listOfPoints) {
mMap.addMarker(MarkerOptions().position(LatLng( point.latitude, point.longitude)))
if (point == listOfPoints[0]) {
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(LatLng(point.latitude, point.longitude), 18f))
}
}
}
}
private fun requestLocationPermissions() {
when (PackageManager.PERMISSION_GRANTED) {
ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) -> {
Log.d("fine_location", "Permission already granted")
}
ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) -> {
Log.d("coarse_location", "Permission already granted")
}
else -> {
requestPermissionLauncher.launch(permissions)
}
}
}
private fun getBackToMainActivity() {
val intent = Intent(this, MainActivity::class.java)
startActivity(intent)
}
private fun getRouteId(): Int {
return intent.getIntExtra("routeId", 0)
}
// Gets the points from room repository through ViewModel
private fun getRoutePoints(): List<PointOfInterest> {
val route = getRouteId()
var points = emptyList<PointOfInterest>()
CoroutineScope(Dispatchers.IO).launch {
points = mapsViewModel.getRoutePoints(route)
}
return points
}
This is my ViewModel for this Activity:
#HiltViewModel
class MapsViewModel #Inject constructor(private val repository: RoomRepository): ViewModel() {
suspend fun getRoutePoints(routeId: Int): List<PointOfInterest> {
return repository.getPointsByRouteId(routeId)
}
}
And the Dao:
#Dao
interface PointsDao
{
#Query("SELECT * FROM points_tbl WHERE route_id = :routeId")
suspend fun getRoutePoints(routeId: Int): List<PointOfInterest>
}
My stracktrace error:
Process: com.buigues.ortola.touristics, PID: 27515
java.lang.IllegalStateException: Method addObserver must be called on the main thread
at androidx.lifecycle.LifecycleRegistry.enforceMainThreadIfNeeded(LifecycleRegistry.java:317)
at androidx.lifecycle.LifecycleRegistry.addObserver(LifecycleRegistry.java:172)
at androidx.lifecycle.SavedStateHandleController.attachToLifecycle(SavedStateHandleController.java:49)
at androidx.lifecycle.SavedStateHandleController.create(SavedStateHandleController.java:70)
at androidx.lifecycle.AbstractSavedStateViewModelFactory.create(AbstractSavedStateViewModelFactory.java:67)
at androidx.lifecycle.AbstractSavedStateViewModelFactory.create(AbstractSavedStateViewModelFactory.java:84)
at dagger.hilt.android.internal.lifecycle.HiltViewModelFactory.create(HiltViewModelFactory.java:109)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.kt:171)
at androidx.lifecycle.ViewModelProvider.get(ViewModelProvider.kt:139)
at androidx.lifecycle.ViewModelLazy.getValue(ViewModelLazy.kt:44)
at androidx.lifecycle.ViewModelLazy.getValue(ViewModelLazy.kt:31)
at com.buigues.ortola.touristics.ui.MapsActivity.getMapsViewModel(MapsActivity.kt:39)
at com.buigues.ortola.touristics.ui.MapsActivity.getRoutePoints(MapsActivity.kt:123)
at com.buigues.ortola.touristics.ui.MapsActivity.access$getRoutePoints(MapsActivity.kt:31)
at com.buigues.ortola.touristics.ui.MapsActivity$onMapReady$1.invokeSuspend(MapsActivity.kt:85)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
The problem is here in getRoutePoints().
CoroutineScope(Dispatchers.IO).launch {
points = mapsViewModel.getRoutePoints(route)
}
The by viewModels() in your ViewModel property does a lazy load of the ViewModel. As a result, if you access your ViewModel property for the first time when you are not on the main thread, it will try to create it on the wrong thread, triggering this crash. ViewModels must be constructed on the main thread.
CoroutineScope(Dispatchers.IO) means you are creating a coroutine scope that by default uses background IO threads, so this code is run on a background thread.
You should not be creating a CoroutineScope for this anyway, because your Activity already has one that is properly managed by the Activity lifecycle (so it will cancel any in-progress jobs if the activity is closed, to avoid wasting resources).
Also, getRoutePoints() is a suspend function. There's no reason for you to be using Dispatchers.IO here. A suspend function by convention is safe to call from any dispatcher. (It is however possible to write one that breaks convention, but Room is properly designed and does not break convention.)
To fix the crash and run a coroutine properly, you should use lifecycleScope.launch { //.... However, this function as you have designed it won't do what you expect. It launches a coroutine to retrieve a value, but then it immediately returns before that coroutine has finished running, so in this case will just return the initial emptyList(). When you launch a coroutine, you are queuing up background work, but the current function that called launch continues synchronously without waiting for the coroutine results. If it did, it would be a blocking function. There's more information about that in my answer here.
So, you should instead make this a suspend function:
// Gets the points from room repository through ViewModel
private suspend fun getRoutePoints(): List<PointOfInterest> {
val route = getRouteId()
return mapsViewModel.getRoutePoints(route)
}
And your onMapReady function should also be fixed to use proper scope:
override fun onMapReady(googleMap: GoogleMap) {
mMap = googleMap
lifecycleScope.launch {
val listOfPoints = getRoutePoints()
for (point in listOfPoints) {
mMap.addMarker(MarkerOptions().position(LatLng( point.latitude, point.longitude)))
if (point == listOfPoints[0]) {
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(LatLng(point.latitude, point.longitude), 18f))
}
}
}
}
I have a kotlinjs app. I handle a particular event (dropping of data onto a component) like this:
onEvent {
drop = { event ->
GlobalScope.async {
//...
dropTask(y, data)
}
}
}
// ...
// this function has to be a suspend function because model's is
private suspend fun dropTask(y: Int, taskId: TaskId) {
// ... prepare data
model.insertBefore(taskId!!, insertBefore?.id)
}
// ... Model's function is defined like this:
suspend fun insertBefore(taskToInsert: TaskId, taskBefore: TaskId?) {
val (src, _) = memory.find(taskToInsert)
// ... and finally, the find function is:
fun find(taskId: TaskId): Pair<Task?, Int> {
// ...
return if (task != null) {
// ...
} else {
throw Exception("Couldn't find task with id $taskId!!")
}
}
The issue is that the Exception gets thrown, but isn't reported anywhere.
I have tried:
a) Installing a CoroutineExceptionHandler into the GlobalScope.async (i.e.:
val handler = CoroutineExceptionHandler { _, e ->
console.log("Caught exception: $e")
}
GlobalScope.async(handler) {
...but this never gets called. This would be relatively clean if I could make it work. It would be even nicer if this was default behavior for kotlinjs, so that exceptions weren't accidentally unreported.
b) Calling await:
drop = { event ->
GlobalScope.launch {
GlobalScope.async() {
// ...
dropTask(y, data)
}.await()
}
}
This does result in the exception being logged to the console, but it's so ugly. It's not possible to call .await() outside of a suspend function or coroutine, so for this particular event handler I have to wrap the async call in a launch. I must be doing something wrong. Anybody have a better pattern that I should be using?
This question has a "kotlin" label only because it's code is in kotlin, there's nothing kotlin-specific in this example, equivalent java code fails exactly the same way.
Running following code (I've created a repo with this minimal example: https://github.com/shabunc/issues-opengl-flickering):
private fun createGlPanel(): GLCanvas {
val profile = GLProfile.get(GLProfile.GL2)
val capabilities = GLCapabilities(profile)
capabilities.sampleBuffers = true
capabilities.doubleBuffered = true
return GLCanvas(capabilities)
}
private class SwingFrame : JFrame() {
val canvas = createGlPanel()
init {
addWindowListener(object : WindowAdapter() {
override fun windowClosing(evt: WindowEvent) {
dispose()
exitProcess(0)
}
})
contentPane.add(canvas, BorderLayout.CENTER)
setSize(600, 500)
isVisible = false
}
}
fun initApp() {
val frame = SwingFrame()
val canvas = frame.canvas
canvas.addGLEventListener(object : GLEventListener {
override fun reshape(glautodrawable: GLAutoDrawable, x: Int, y: Int, width: Int, height: Int) {
}
override fun init(glautodrawable: GLAutoDrawable) {
glautodrawable.gl.gL2.glClearColor(1f, 0f, 0f, 1f)
val animator = FPSAnimator(glautodrawable, 60, false)
animator.start()
}
override fun dispose(glautodrawable: GLAutoDrawable) {}
override fun display(glautodrawable: GLAutoDrawable) {}
})
frame.isVisible = true
}
fun main() {
val frame = initApp()
}
supposed to launch a window with a red background on it, which is what exactly happens on Linux and MacOS. On windows, though, I got crazy flickering and having hard times to understand how can I change this code to fix this. I would appreciate any hints because hacks like -Dsun.awt.noerasebackground=true (this is only thing I managed to google) ain't working for me as well. I really hope I'm missing something elementary because it's almost "Hello world" level of example.
After investigating some other examples the minimal difference between mine code and code that doesn't flicker was following:
override fun display(glautodrawable: GLAutoDrawable) {
glautodrawable.gl.gL2.glClear(GL2.GL_COLOR_BUFFER_BIT or GL2.GL_DEPTH_BUFFER_BIT)
}
Having a Processor class, trying to replace some of the code with coroutines. Since it is in a non coroutines context so val serviceScope = CoroutineScope(Dispatchers.IO + serviceJob) is added and used for start coroutines.
Added CoroutineScope, and using serviceScope.launch{} in the place which was using Thread{}.start().
Inside the function restart(), it replaced the using of CountDownLatch with
serviceScope.launch {
withContext(Dispatchers.IO) {
doReset()
}
}
Question: this launch/withContext actually does not stop the code execution of the next if (!conDoProcess) -- so it fails to do what the latch used to do.
what is the right way to stop the code execution until the doReset() . is done?
Another question, when dispose this Processor object it calls serviceScope.cancel(),
what is the difference if call with serviceJob.cancel()?
class Processor {
private val serviceJob = Job()
private val serviceScope = CoroutineScope(Dispatchers.IO + serviceJob)
.........
/* return false if the it does not start the processing */
fun restart(): Boolean {
synchronized(_lock) {
.........
// 1.old code using latch to wait
/******************
val latch = CountDownLatch(1)
streamThreadPoolExecutor.execute {
doReset() //
latch.countDown()
}
latch.await(3, TimeUnit.SECONDS) // wait at most for 3 seconds if no one calls countDown
*******************/
// 2. change to using coroutines to suspend
serviceScope.launch {
withContext(Dispatchers.IO) {
doReset()
}
}
// wait until reset is done
if (!conDoProcess) {// the doRest() should update conDoProcess
return false
}
for (i in providers.indices) {
val pr = provider[i]
serviceScope.launch {
pr.doProcess()
}
}
return true
}
}
fun dispose() {
synchronized(_lock) {
.........
serviceScope.cancel()
// or should it use
// serviceJob.cancel()
//==========>
}
}
}
I think it used the serviceScope.launch wrong, it should include the rest part after the blocking part withContext(Dispatchers.IO), but inside the serviceScope.launch.
// 2. change to using coroutines to suspend
serviceScope.launch {
withContext(Dispatchers.IO) {
doReset()
}
// wait until reset is done
if (!conDoProcess) {// the doRest() should update conDoProcess
return false
}
for (i in providers.indices) {
val pr = provider[i]
serviceScope.launch {
pr.doProcess()
}
}
}
return true