5,060 questions
0
votes
1
answer
25
views
Is kotlin coroutine Job's status is reliable for concurrency control?
I've read this sentence in the Java Concurrency in Practice book that:
The result of Thread.getState should not be used for concurrency
control, and is of limited usefulness for testing—its primary ...
0
votes
0
answers
66
views
java.lang.NoSuchMethodError: void kotlinx.coroutines.CompletableDeferredImpl.initParentJob(kotlinx.coroutines.Job) when building Android project
I am getting the following error when trying to build my Android project:
Cause 1229: java.lang.NoSuchMethodError: "void kotlinx.coroutines.CompletableDeferredImpl.initParentJob(kotlinx....
- 553
2
votes
1
answer
74
views
How can I tie a coroutine's lifetime to the lifetime of an object?
I have some code similar to this:
class Foo {
var x = 0
init {
GlobalScope.launch {
while (true) {
delay(1000)
x += 1
}...
- 216
0
votes
1
answer
128
views
Strictly depending on Coroutine 1.8.1 to use BroadcastChannel with Kotlin 2
I have a code base which is tightly coupled with BoradcastChannel and I can't update that for now. But I want to upgrade the dependencies to their latest, use kotlin2 and compose.
I have changed my ...
- 1,037
0
votes
1
answer
32
views
Creating activity prevents spinner from spinning in Android
I have 2 activities in my app. When another one is called there is a spinner but it doesn't spin. I think it may be because the main thread is stuck.
I moved all background tasks to Dispatchers.IO, ...
5
votes
0
answers
118
views
Why is the action of Mutex.withLock not marked as suspend?
The action parameter of the withLock function is a lambda without the suspend keyword. Is there a reason for this missing keyword?
In most cases, this lack of the suspend keyword isn't an issue ...
1
vote
2
answers
149
views
Testing a function that creates a coroutine scope inside it
I have something like the following in Kotlin:
class A {
fun a(): Unit = TODO()
}
fun foo(a: A) {
// Do something
CoroutineScope(Dispatchers.IO).launch {
delay(1000)
a.a()
...
- 8,403
2
votes
2
answers
82
views
Deadlock when withContext() is combined with logging in object initializer
Consider the following Kotlin object:
package com.example
import org.slf4j.LoggerFactory
import java.lang.Thread.currentThread
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines....
- 5,460
0
votes
1
answer
65
views
Jetpack Compose `LazyColumn takes` ~3 to ~4seconds to reflect `mutableStateListOf` mutations even though `Flow` emits immediately [closed]
I switch between “chart windows” (weekly, monthly…). Upstream data is a hot Flow (think Room).
To keep the list size stable, I render 30 fixed slots: real items in the first n, placeholders in the ...
2
votes
1
answer
40
views
Implement same task for two different user interfaces in Kotlin [closed]
I am working on a program which has both a TUI (terminal user interface) as well as a GUI (graphical user interface).
The program has some functions which take quite a long time to complete (waiting ...
- 356
0
votes
1
answer
82
views
Why does Android prohibit running IO-performing coroutines from the main thread? [closed]
Context and prior understanding:
In Node.JS, I/O code is run in a thread pool / event loop parallel to the main JavaScript thread. async code is never truly blocking per-se, unless a blocking call (e....
- 697
2
votes
1
answer
59
views
Unclear execution order of Kotlin coroutines
Why the output of this code is so unpredictable?
suspend fun main() {
val job1 = GlobalScope.launch {
delay(1000L)
println("World!")
}
val job2 = GlobalScope....
- 21
0
votes
1
answer
51
views
SharedFlow emmited in another scope in a separated class is not collected
I have a Bluetooth tracker app. I try it to be clean. Everything related to scan is encapsulated in one class. I am injecting with Hilt.
The problem is when I scan via Bluetooth for 10s, I emit the ...
- 49
0
votes
0
answers
35
views
Missing MDCContext from kotlin web flux
I have a spring web flux based application, written in kotlin I am adding few information in reactor context by using web filter. I also have logging information which I set in MDCContext but I am ...
0
votes
1
answer
75
views
Problems with Ktor receiving multipart: Flow invariant is violated
I am rather new to Ktor and try to upload a file to my server. This is the route:
fun Application.module() {
install(ContentNegotiation) {
json()
}
routing {
post("/upload") {
...
- 698