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il...@google.com
jb...@google.com
Yigit, do you have time to fix it?
reemission of the same liveData is racy
reemission of the same liveData is racy
jb...@google.com
Thanks for the detailed analysis. This may not be an issue anymore since we've started using Main.immediate there but I' not sure; I'll try to create a test case.
an...@google.com
just emitting same live data reproduces the issue.
@Test
fun raceTest() {
val subLiveData = MutableLiveData(1)
val subject = liveData(testScope.coroutineContext) {
emitSource(subLiveData)
emitSource(subLiveData) //crashes
}
subject.addObserver().apply {
testScope.advanceUntilIdle()
}
}
@Test
fun raceTest() {
val subLiveData = MutableLiveData(1)
val subject = liveData(testScope.coroutineContext) {
emitSource(subLiveData)
emitSource(subLiveData) //crashes
}
subject.addObserver().apply {
testScope.advanceUntilIdle()
}
}
jb...@google.com
With 2.2.0-alpha04 (that use Main.immediate), the issue seems to be still there (I tested it by calling emitSource() twice, like your test case)
co...@gmail.com
yea sorry immediate does not fix it.
I actually have a WIP fix for it:
https://android-review.googlesource.com/c/platform/frameworks/support/+/1112186
if your case is the one i found (emitting same LiveData multiple times, as shown in #5) you can work around it by adding a dummy transformation.
val subLiveData = MutableLiveData(1)
val subject = liveData(testScope.coroutineContext) {
emitSource(subLiveData.map {it })
emitSource(subLiveData.map {it} )
}
I actually have a WIP fix for it:
if your case is the one i found (emitting same LiveData multiple times, as shown in #5) you can work around it by adding a dummy transformation.
val subLiveData = MutableLiveData(1)
val subject = liveData(testScope.coroutineContext) {
emitSource(subLiveData.map {it })
emitSource(subLiveData.map {it} )
}
an...@google.com
Project: platform/frameworks/support
Branch: androidx-master-dev
commit af12e75e6b4110f48e44ca121466943909de8f06
Author: Yigit Boyar <yboyar@google.com>
Date: Tue Sep 03 12:58:11 2019
Fix coroutine livedata race condition
This CL fixes a bug in liveData builder where emitting same
LiveData source twice would make it crash because the second
emission registry could possibly happen before first one is
removed as source.
We fix it by using a suspending dispose function. It does feel
a bit hacky but we cannot make DisposableHandle.dispose async
and we do not want to block there. This does not mean that there
is a problem if developer disposes it manually since our emit
functions take care of making sure it disposes (and there is
no other way to add source to the underlying MediatorLiveData)
Bug: 140249349
Test: BuildLiveDataTest#raceTest_*
Change-Id: I0b464c242a583da4669af195cf2504e2adc4de40
M lifecycle/lifecycle-livedata-ktx/api/2.2.0-alpha05.txt
M lifecycle/lifecycle-livedata-ktx/api/current.txt
M lifecycle/lifecycle-livedata-ktx/api/public_plus_experimental_2.2.0-alpha05.txt
M lifecycle/lifecycle-livedata-ktx/api/public_plus_experimental_current.txt
M lifecycle/lifecycle-livedata-ktx/api/restricted_2.2.0-alpha05.txt
M lifecycle/lifecycle-livedata-ktx/api/restricted_current.txt
M lifecycle/lifecycle-livedata-ktx/src/main/java/androidx/lifecycle/CoroutineLiveData.kt
M lifecycle/lifecycle-livedata-ktx/src/test/java/androidx/lifecycle/BuildLiveDataTest.kt
https://android-review.googlesource.com/1112186
https://goto.google.com/android-sha1/af12e75e6b4110f48e44ca121466943909de8f06
Branch: androidx-master-dev
commit af12e75e6b4110f48e44ca121466943909de8f06
Author: Yigit Boyar <yboyar@google.com>
Date: Tue Sep 03 12:58:11 2019
Fix coroutine livedata race condition
This CL fixes a bug in liveData builder where emitting same
LiveData source twice would make it crash because the second
emission registry could possibly happen before first one is
removed as source.
We fix it by using a suspending dispose function. It does feel
a bit hacky but we cannot make DisposableHandle.dispose async
and we do not want to block there. This does not mean that there
is a problem if developer disposes it manually since our emit
functions take care of making sure it disposes (and there is
no other way to add source to the underlying MediatorLiveData)
Bug: 140249349
Test: BuildLiveDataTest#raceTest_*
Change-Id: I0b464c242a583da4669af195cf2504e2adc4de40
M lifecycle/lifecycle-livedata-ktx/api/2.2.0-alpha05.txt
M lifecycle/lifecycle-livedata-ktx/api/current.txt
M lifecycle/lifecycle-livedata-ktx/api/public_plus_experimental_2.2.0-alpha05.txt
M lifecycle/lifecycle-livedata-ktx/api/public_plus_experimental_current.txt
M lifecycle/lifecycle-livedata-ktx/api/restricted_2.2.0-alpha05.txt
M lifecycle/lifecycle-livedata-ktx/api/restricted_current.txt
M lifecycle/lifecycle-livedata-ktx/src/main/java/androidx/lifecycle/CoroutineLiveData.kt
M lifecycle/lifecycle-livedata-ktx/src/test/java/androidx/lifecycle/BuildLiveDataTest.kt
ja...@google.com
Checked in beta snapshot and this is still an issue. Any updates or workarounds?
jb...@google.com
Currently working on a potential fix in aosp/1591051. Do you have an updated version of the app that uses the latest compose? If so I could check if that fix addresses your use case.
As far as work arounds, to avoid the crash you can clear the back stack when the NavHost is disposed by adding
onDispose {
while (navController.popBackStack()) { }
}
ap...@google.com
Project: platform/frameworks/support
Branch: androidx-main
commit e2280407cf218dd031a8f74dba2b4d709fc3e826
Author: Jeremy Woods <jbwoods@google.com>
Date: Mon Mar 01 11:43:16 2021
No-op for same ViewModelStore and LifecycleOwner
When attempting to setViewModelStore or setLifecycleOwner if the
parameter passed in is the same as the one already set on the
NavController, the call should be a no-op.
RelNote: "Calling setViewModelStore or setLifecycleOwner with the same
object that has already been set will now be a no-op"
Test: NavControllerTest
Bug: 177825470
Change-Id: Idf491fa68c0771dd617832cefe4c03e8ea85dae7
M navigation/navigation-runtime/src/androidTest/java/androidx/navigation/NavControllerTest.kt
M navigation/navigation-runtime/src/main/java/androidx/navigation/NavController.java
https://android-review.googlesource.com/1611781
Branch: androidx-main
commit e2280407cf218dd031a8f74dba2b4d709fc3e826
Author: Jeremy Woods <jbwoods@google.com>
Date: Mon Mar 01 11:43:16 2021
No-op for same ViewModelStore and LifecycleOwner
When attempting to setViewModelStore or setLifecycleOwner if the
parameter passed in is the same as the one already set on the
NavController, the call should be a no-op.
RelNote: "Calling setViewModelStore or setLifecycleOwner with the same
object that has already been set will now be a no-op"
Test: NavControllerTest
Bug: 177825470
Change-Id: Idf491fa68c0771dd617832cefe4c03e8ea85dae7
M navigation/navigation-runtime/src/androidTest/java/androidx/navigation/NavControllerTest.kt
M navigation/navigation-runtime/src/main/java/androidx/navigation/NavController.java
jb...@google.com
This has been fixed internally and will be released as part of the Navigation 2.3.4 version.
You can verify this by following the snapshot instructions with build id 7177928 and switching your navigation dependency to 2.4.0-SNAPSHOT. Note that this will need to be an explicit dependency on navigation-runtime in addition to the dependency on navigation-compose.
ap...@google.com
Project: platform/frameworks/support
Branch: androidx-main
commit b76fc769718910bb2630c5e8c951d50df38e4d58
Author: Jeremy Woods <jbwoods@google.com>
Date: Tue Mar 02 09:22:58 2021
Bump nav-compose nav dependency to 2.3.4
Making nav-compose depend on navigation-runtime 2.3.4 for a fix to no-op
when setting the same ViewModelStore.
RelNote: "Navigation Compose now depends on Navigation version 2.3.4
which includes the fix for attempting to set the same ViewModelStore
object after the graph has been set."
Test: NavHostTest
Bug: 177825470
Change-Id: I65c24fcd5674c1ac72715c612854aac62c2eda88
M navigation/navigation-compose/build.gradle
M navigation/navigation-compose/src/androidTest/java/androidx/navigation/compose/NavHostTest.kt
https://android-review.googlesource.com/1612802
Branch: androidx-main
commit b76fc769718910bb2630c5e8c951d50df38e4d58
Author: Jeremy Woods <jbwoods@google.com>
Date: Tue Mar 02 09:22:58 2021
Bump nav-compose nav dependency to 2.3.4
Making nav-compose depend on navigation-runtime 2.3.4 for a fix to no-op
when setting the same ViewModelStore.
RelNote: "Navigation Compose now depends on Navigation version 2.3.4
which includes the fix for attempting to set the same ViewModelStore
object after the graph has been set."
Test: NavHostTest
Bug: 177825470
Change-Id: I65c24fcd5674c1ac72715c612854aac62c2eda88
M navigation/navigation-compose/build.gradle
M navigation/navigation-compose/src/androidTest/java/androidx/navigation/compose/NavHostTest.kt
jb...@google.com
Now that Navigation compose depends on navigation-runtime 2.3.4, you can use the navigation-compose 1.0.0-SNAPSHOT with buildId 7179952.
Description
Android Studio Build: AF4
This happens when using nested navigation
val navController = rememberNavController()
NavHost(navController = navController) {
navigation {
something(navController) {
}}}
and in NavGraphBuilder.something:
composable{
onCommit(onboardingComplete) {
if (!onboardingComplete) {
navController.navigate(MainDestinations.ONBOARDING_ROUTE)
}
}}
Commenting this line out yields no crashes and navController.navigate() is used in many other places.
Not sure if it has to do with nested nav, but it worked fine with two nested navhosts.
I've uploaded a fork of Owl where this happens:
Crash in: Owl/app/src/main/java/com/example/owl/ui/courses/Courses.kt