kotlinlang #koin

Hello, I’m trying to use Koin for my multiplatform project. Some of my dependencies has to be registered from iOS side, is there a way to do this? I can’t use module’s

factory { }

single { }

methods because they are reified functions (got exception

IllegalStateException: unsupported call of reified inlined function

). There is a task I created https://github.com/InsertKoinIO/koin/issues/1108 but still no answer.

Yahor

08/17/2021, 8:17 AM

@arnaud.giuliani Hello, do you have a roadmap for the new releases?)

wbertan

08/17/2021, 9:24 AM

Hello, we are seeing a weird crash using Koin in a KMM project 🤔 We call

koin.get(objCObject: type) *as*! T

in Swift and it works, we are calling it in

SceneDelegate

willConnectTo

. When opening the app, all works, putting the app in background, still works, coming back still works. After some time the app in Background, we can see a bunch of crashes in that line on

SceneDelegate

trying to

get

the dependency. The object I’m trying to get in

SceneDelegate

is the

IsAuthenticatedUseCase

(hence I’m putting everything it needs to actually creates its own dependencies - in 🧵).

koin

is created and started in

SceneDelegate

, or the error would be a

nil

if it wasn’t.

Non-fatal Exception: InstanceCreationException
Could not create instance for [Singleton:'my.package.common.core.authentication.IsAuthenticatedUseCase']

Sorry for the stacktrace, we are using CrashKiOS to actually be able to see this crash, will post the stacktrace, and definition of dependencies in 🧵

g4sarma

08/19/2021, 9:27 AM

Hey guys, i am trying to migrate from V2 to V3 and get rid of the Jcenter dependency in my project. And it seems gradle is not able to recognize the io.insert-koin in my project when trying to import the same in my class. Has anyone faced a similar problem ?

Bradford Canonigo

08/28/2021, 7:40 AM

I called

startKoin

inside my Application class in Android, and called

loadKoinModules

inside the MainActivity after user logged in. Why am I always receiving

KoinApplicaiton has not been started

error?

kevindmoore

08/30/2021, 5:49 PM

I might have to remove Koin from my project as I keep getting crashes due to Fragments being reinstantiated. I've put all kinds of code in to check the status and stop/restart koin.

Songv

08/31/2021, 9:53 AM

Hi all, I have a config bean and a service bean, the service bean has two impl, I need to choose one service impl to register by the condition(using config to calculate the condition). How can I do? or maybe I can registry them all, and inject by condition, I don’t know how to do in koin also.

Orhan Tozan

09/02/2021, 2:24 PM

So what is the recommended way of using Koin with testing? Both documentation pages have different sample code: https://insert-koin.io/docs/reference/koin-test/testing https://insert-koin.io/docs/quickstart/junit-test/ Confusing

Matt Thompson

09/02/2021, 3:47 PM

anyone know how to use

checkModules

with

stateViewModel

? I was previously getting around it by using `

create<ViewModelType> { StateDefinitionParameter(SavedStateHandle()) }

but

StateDefinitionParameter

no longer exists

Matthew Laser

09/02/2021, 8:15 PM

I know there's the

get

from

KoinJavaComponent

, but not sure if that is the preferred method for getting on demand instances in Kotlin code

mirland

09/17/2021, 3:21 PM

Jetpack ViewModel has a lot of advantages, it's a good state holder because it's aware of the configuration changes and other stuff. Suppose that you have another class, that is not a viewModel, and you want the same behavior. Is it posible using koin? When you're injecting a VM, you are injecting something that has a lifecycle aware scope, so is it possible?

orafaaraujo

09/22/2021, 1:48 PM

Hello, I'm having this stacktracke while I'm trying to work with api/impl module

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: ......, PID: 29490
    java.lang.StackOverflowError: stack size 8MB
        at kotlin.reflect.jvm.internal.pcollections.IntTree.get(IntTree.java:93)
        at kotlin.reflect.jvm.internal.pcollections.IntTree.get(IntTree.java:93)
        at kotlin.reflect.jvm.internal.pcollections.IntTreePMap.get(IntTreePMap.java:42)
        at kotlin.reflect.jvm.internal.pcollections.HashPMap.getEntries(HashPMap.java:85)
        at kotlin.reflect.jvm.internal.pcollections.HashPMap.get(HashPMap.java:51)
        at kotlin.reflect.jvm.internal.KClassCacheKt.getOrCreateKotlinClass(kClassCache.kt:32)
        at kotlin.reflect.jvm.internal.ReflectionFactoryImpl.getOrCreateKotlinClass(ReflectionFactoryImpl.java:50)
        at kotlin.jvm.internal.Reflection.getOrCreateKotlinClass(Reflection.java:59)
        at org.koin.android.ext.koin.ModuleExtKt.androidApplication(ModuleExt.kt:54)

chi

09/27/2021, 10:01 AM

I'm having issues injecting a scoped dependency into my viewmodel and creating the viewmodel.

class Cache(sess: SessionManager)

class MyViewModel(cache: Cache): ViewModel {}

module {
   single { SessionManager() }

   scope(named("userSession")) {
       scoped { Cache(get()) }

       viewModel { MyViewModel(get()) }
   }
} 

class MyFragment: Fragment() {
    private val myVm: MyViewModel by viewModel()
}

The above is the structure of my koin setup but when I run this it crashes my app with the error;

Caused by: org.koin.core.error.NoBeanDefFoundException: No definition found for class:'com.play.MyViewModel'. Check your definitions!

Please what could I be doing wrongly here?

George Theocharis

09/28/2021, 8:29 AM

Hey all! Most probably it wont be koin but as I am losing my mind here goes. After updating koin to 3.1.2 google maps are not visible. Do you think it can be something koin related? In the commit we "lose" the maps the only thing changed is the koin version. Although koin seems to be working as it injects stuff correctly.

Vivek Modi

09/28/2021, 11:34 AM

Hey i am using

koin 2.2.2

whenerver i used any object class and inject through koin and used that object class in any other class like view holder it gives warning. How to avoid this warning

🙌 1

Scott Kruse

10/15/2021, 4:29 AM

Is compose multiplatform supported by Koin multiplatform?

Sam

10/19/2021, 3:56 AM

Hello everyone, I have read this article about performance of

Koin

Ref: https://proandroiddev.com/how-dagger-hilt-and-koin-differ-under-the-hood-c3be1a2959d7 Im curious, How can I calculate the performance of Koin in Runtime like this articles? Thanks.

Merseyside

10/21/2021, 8:51 AM

Hi! How can I add an instance to navGraph scope and provide it in fragment's ViewModels inside this navGraph? it's ok with shared ViewModel in navGraph, but how to use it with usual intances?

Chris

10/25/2021, 8:54 AM

Hi … I have a question about migration from koin 2.x to 3.x In my fragment I use something like this

val viewModel by getScope("user-session").viewModel<Class>(owner = this)

this works fine at least for koin 2.x. What happens in getscope() is it check it this scope is there or creates a new one of user-session. So that the viewmodel is bound to the user-session scope. For koin 3.x I have to add more complex implementation

val viewModel by getScope("user-session").viewModel<Class>(owner = {ViewModelOwner.from(findNavController().getViewModelStoreOwner(R.id.graph))})

is this the way to go or is there a better solution for ? Thanks in advance

Matthew Laser

10/26/2021, 2:24 PM

does anyone know if it's possible to inject into an android
JobService
? It's an extension of
Service
so it seems like Koin should support it in the way that
Activity
and
Fragment
are (by being able to simply use
by inject<MyClass>()
) but it's not working as I'd expect this works fine!

ABRAR WIRYAWAN

10/31/2021, 2:43 PM

Hi, i want to ask about what is "with" in this context? I mean, added with what? Thanks before

arnaud.giuliani

11/02/2021, 10:30 AM

Hi all, here is the Koin 3.1.3 changelog - https://github.com/InsertKoinIO/koin/blob/master/CHANGELOG.md#313

:kotlin-intensifies: 2

👍 4

Eric Martori

11/02/2021, 1:20 PM

We are having an issue since we updated from the version 2.X to 3.1.3 in our Android App: Crashlytics is reporting that about 5% users are having the following crash:

Caused by java.util.NoSuchElementException
ArrayDeque is empty.
org.koin.core.scope.Scope.resolveInstance (Scope.kt:213)
org.koin.core.scope.Scope.get (Scope.kt:193)
org.koin.androidx.viewmodel.factory.DefaultViewModelFactory.create (DefaultViewModelFactory.kt:11)
androidx.lifecycle.ViewModelProvider.get (ViewModelProvider.java:187)
androidx.lifecycle.ViewModelProvider.get (ViewModelProvider.java:150)
org.koin.androidx.viewmodel.ViewModelResolverKt.get (ViewModelResolver.kt:23)
org.koin.androidx.viewmodel.ViewModelResolverKt.resolveInstance (ViewModelResolver.kt:12)
org.koin.androidx.viewmodel.scope.ScopeExtKt.getViewModel (ScopeExt.kt:86)
org.koin.androidx.viewmodel.scope.ScopeExtKt.getViewModel (ScopeExt.kt:72)
org.koin.androidx.viewmodel.ext.android.ViewModelStoreOwnerExtKt.getViewModel (ViewModelStoreOwnerExt.kt:68)

But we are unable to reproduce the issue and haven't seen it in over 2 weeks of testing. I've seen that there is an open issue that seems related to this: https://github.com/InsertKoinIO/koin/issues/1149 But we are no using the

getOrNull

method that the tickets seems to imply is the cause of the issue. Is there anything (besides downgrading or waiting for a fix) that we can do? Does anyone know a way we could try and reproduce the issue in a consistent manner or why is it so hard to reproduce the issue?

aipok

11/03/2021, 9:44 AM

does anyone knows why

factory

is getting warning

This API is using reflection and implies some introspection performance penalties on limited capacity devices (Android)

in 3.1.3? How to fix it?

holgerbrandl

11/06/2021, 7:19 PM

Hi there, has anyone tried to persist/unpersist a KoinApplication/Koin instance using https://github.com/EsotericSoftware/kryo? If so, is there some implementation I could recycle?

Rak

11/08/2021, 3:38 PM

Hi, I am trying to replace a dependency after Koin has started in my tests. In the docs there is a reference to a

declare

method but I cant seem to get it to resolve in the IDE.

Lukasz Kalnik

11/09/2021, 5:07 PM

I have an Android/iOS project which has a Koin module in

shared

: CommonModule.kt:

val commonModule = module {
    single<HttpClient> { TmdbApi.createHttpClient() }
    single<TmdbApi> { TmdbApi(client = get()) }
}

fun initKoin() = startKoin {
    modules(CommonModule.module)
}

In the Android app I can inject dependencies very easily:

val tmdbApi: TmdbApi by inject()

In the iOS AppDelegate I call

CommonModuleKt.doInitKoin()

How can I inject the dependencies in the iOS

ContentView

Hakob Astvacatryan

11/10/2021, 3:39 PM

Hey folks, we are considering koin as a DI solution for our project. Does anybody experienced issues working with koin in case of multi modular big project(about 30 modules)

➕ 1

Alexander Mitropolsky

11/11/2021, 5:00 PM

Hi! I noticed that ScopeDLS.viewModel (...) extension uses “scoped” instead of “factory” for the ViewModel definition. This fact may lead to issues if the scope qualifier is different from the ViewModelStoreOwner. Here is an example: Let’s create scopes:

scope(qualifier<SomeFragment>())

scope(qualifier<LongLiveScope>()) {

viewModel { SomeViewModel ()}

Then we link these scopes:

fragmentScope.linkTo(longLiveScope)

Then we inject SomeViewModel into SomeFragment with the

viewModel()

extension, which uses the ViewModelStore from SomeFragment. When SomeFragment is destroyed, its ViewModelStore is also destroyed, and

SomeViewModel::onClear

will be called. However, the SomeViewModel instance will not be destroyed because it is scoped in LongLiveScope, which leads to issues when the same (already cleared) instance of SomeViewModel is reused in new fragments. For example, ViewModel’s coroutines scope will not work because it will be already closed after onCleared. I think the ViewModel should be shared using the shared ViewModelStore, but not using the Koin scope, otherwise, it breaks the lifecycle of the ViewModel itself. I hope I explained this issue in sufficient detail. Can you please explain why the ViewModel definition has changed? And what can I do if the ViewModelStoreOwner is different from the scope, other than rolling back the old ViewModel definition? Thank you!

Title

Alexander Mitropolsky

11/11/2021, 5:00 PM

scope(qualifier<SomeFragment>())

scope(qualifier<LongLiveScope>()) {

viewModel { SomeViewModel ()}

Then we link these scopes:

fragmentScope.linkTo(longLiveScope)

Then we inject SomeViewModel into SomeFragment with the

viewModel()

extension, which uses the ViewModelStore from SomeFragment. When SomeFragment is destroyed, its ViewModelStore is also destroyed, and

SomeViewModel::onClear

arnaud.giuliani

11/12/2021, 8:17 AM

viewModel in scope can survive to lifecycle changem and then regenerates the instance from current Android ViewModel Factory

as previously it was loosing it completely

referencing ViewModel in cascade this way, is not sometyhing I would advise

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