kotlinlang #dagger

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mattinger

10/20/2022, 11:06 PM

I’m generally having issues with IntoMap as a whole. Even if i have a type defined

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interface SomeTypeFactory: Function0<SomeType>

And use that instead, i get the same sort of error

10/20/2022, 11:07 PM

Yes the wildcards will cause issues.

10/20/2022, 11:07 PM

Dagger needs updated to use the declared type from the Kotlin metadata and not the bytecode type in general

10/20/2022, 11:08 PM

For normal types you can work around it with @JvmSuppressWildards. Don't think you can do anything with function types, but I haven't tried.

mattinger

10/20/2022, 11:12 PM

Thanks @jw I just tried that, and it seems to work for function types. I remember having to do this for @IntoSet before, but that was a while ago and forgot about it.

mattinger

10/20/2022, 11:13 PM

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factories: Map<@JvmSuppressWildards Class<*>, @JvmSuppressWildards () -> SomeType>

mattinger

10/20/2022, 11:14 PM

My main use case for this is going to end up creating a ViewModel factory. I want to inject that into my activity to pass off to the higher level composables that need to create composable scoped view models. It definitely seems cleaner to me than injecting all the services i would need to create those view models and having to pass them down the line. This does have one limitation in that you can’t have one view model take another as a constructor argument, since you don’t have the ViewModelStoreOwner inside of the factory.

agrosner

10/21/2022, 2:15 AM

+ 1 that dagger should use the kotlin metadata declared type. Dagger needs work to support kotlin better on that front. Having to provide functions just to cast away their generics … 🙃

Sushobh

11/01/2022, 2:48 AM

I am working on a new app and I am planning to use dagger. I am specifically interested to know your thoughts on dagger components. 1. Should I create components based on the lifecycle of their use case. For example, a component for all objects when the user is logged in? I am confused about how to structure my components. 2. Where should components be stored? For example, for the user logged in component, where do I store the component? 3. How do I dispose of components? Is setting it to null enough? Online posts do not go into the details of how to structure components for large projects. So I am having a hard time, how many components to create and for what use cases. Please assist. If there is a better channel for this question let me know.

Sergio C.

11/01/2022, 11:11 PM

Hi, Any ideas on how to make this work? I need to observe the API URL change from shared preferences in the APIModule but Hilt doesn't like the idea of injecting constructor here... Modules that need to be instantiated by Hilt must have a visible, empty constructor.

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@Module
@InstallIn(SingletonComponent::class)
class ApiModule @Inject constructor(
    localPrefs: SharedPreferences,
    app: Application,
) {

    init {
        localPrefs.registerOnSharedPreferenceChangeListener { prefs: SharedPreferences?, key: String? ->
            if (key == app.getString(R.string.pref_key_api_url)) {
                val newApiUrl = prefs?.getString(key, defaultApiUrl) ?: defaultApiUrl
                Logger.w("API URL CHANGED!!! $newApiUrl")
            }
        }
    }

}

Preetham Ivan Dsouza

11/07/2022, 12:35 PM

Hi, How can we update a singleton component if we have any param changes to be applied to any given @provides method using Hilt dependency injection? Since Singleton components are initialised initially itself and if we have to update any keys to the

certificatePinner

etc (if we are setting keys dynamically and not locally) how do we achieve the same with Hilt? Ref: Similar use case to this issue

Kshitij Patil

11/28/2022, 6:47 AM

I am currently writing a ksp processor which generates

FooImpl

for an interface

Foo

when annotated. Now I want dagger to know binding

Foo

with

FooImpl

from my generated code. Adding simple

@Inject

to the constructor of generated class doesn’t work, I guess because the code is not available at compile time. How can I achieve this?

Christoph Wiesner

12/14/2022, 7:12 AM

i have the problem of injecting different implementations of an interface depending on a config:

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@Provides
fun provideManager(config, managerImplA, managerImplB): Manager {
	return if (config.shouldUseA) {
		managerImplA
	} else {
		managerImplB
	}
}

doing this means i have to instantiate both implementation but only one gets used in the end. problem is that all the dependencies of the implementation also will get wired up and kick off some processes that i do not want to be instantiated if that version is not gonna be used. is there a way to achieve this without having the instances already?

dimsuz

12/16/2022, 11:37 AM

Hi! If I have

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interface A
interface B

class AB : A, B

And I want to have a single intance of

AB

provided as

and

separately:

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@Provides fun providesA(): A
@Provides fun providesB(): B

How is this normally done in dagger? Do I do it like this:

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@Provides fun providesAB(): AB
@Provides fun providesA(ab: AB): A = ab
@Provides fun providesB(ab: AB): B = ab

Feels like there could be a way to avoid manually writing such basic methods. Also don't like the fact that I have to provide

AB

too, although I'd prefer it to be an implemenation detail

nuhkoca

12/27/2022, 2:46 PM

Hello, I am trying to create a baseline profile for our project but

benchmark

module throws the exception below when executing

./gradlew connectedBenchmarkAndroidTest -Pandroid.testInstrumentationRunnerArguments.androidx.benchmark.enabledRules=BaselineProfile

task

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symbol: class DeveloperSettingsModule
error: ComponentProcessingStep was unable to process 'path.to.package.core.di.ApplicationComponent' because '<error>' could not be resolved.

Can somebody please help me figure out what’s wrong with Dagger? I am confused.

mattinger

01/13/2023, 1:52 PM

Has anyone tried using dagger along with dynamic feature modules? Specifically anvil based dagger? Since the code is not actually downloaded with the app, i suspect it would be hard to include things in a feature module that contribute to the application/singleton scope. Also, i was under the impression that it was essentially a 2 way dependency, since you add the app project as a dependency in your gradle file. However, I seem to be unable to resolve classes from my app module.

01/13/2023, 1:54 PM

It will not work. You would have to use separate components for each feature and component dependencies to access things in the app module

01/13/2023, 1:54 PM

By definition your feature module scope is going to be smaller than your app/singleton scope because it can be loaded after the fact

mattinger

01/13/2023, 1:57 PM

That’s what i thought. I do have a feature module scope, but it contributes a factory creation function to the main AppScope, since the feature module scope is a sub component of the main one.

Emirhan Emmez

01/18/2023, 7:39 PM

Hi all, is there any good example repo for custom component usage in hilt? (especially for clean arch)

Susheel

01/19/2023, 5:24 PM

I have a class A that takes AppCompatActivity as a parameter. I want to be able to inject A using dagger. Is there a way to do that? (I'm also wondering if this is an anti-pattern)

Constantin Cezar Begu

01/23/2023, 3:30 PM

Hey I have a interesting problem. I am using hilt right now and found a limitation. Basically I want to. scope a class to a viewmodel store owner. Generally people would say to scope it to @ActivityRetainedScope but this is not good for my use case. Example: You have fragment 1 inside of fragment 2 and fragment 3 inside of fragment 2. fragment 1 and 3 can be destroyed at any point. the items created for fragment 1 (which is a viewmodel store owner) I don't want to share with fragment 2 or 3 (which are other viewmodel store owners). Injected items are shared for viewmodels (for fragment 1). Looks like @ActivityRetained scope does not do the trick since it would share for viewmodels but also for viewmodels used in fragment 1,2,3 (they use the same activity). @ViewmodelScoped scoped the item to a specific viewmodel (does not share with other viewmodels in fragment 1) Is there a elegant way to solve a problem like this?

Colton Idle

01/27/2023, 7:26 AM

I feel like I'm getting some conflicting info with hilt and assisted injection. I currently have this

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class GetTeamsUseCase @Inject constructor(
  val apiService: ApiService, <---- provided by a @Provides method
  val accessToken: String <---- I'd like to "inject" this at runtime since I get it once I login
) {

Is this possible to do or do I need some other lirbary?

Philip Dukhov

02/06/2023, 2:53 PM

Hey, is there a way to know when object is no longer available so subscriptions, coroutine scope, etc, can be cancelled? Like with

ActivityScoped

, when activity is destroyed - in this particular case I could've get an activity with

ActivityContext

and listen to the lifecycle, but this won't work generally, e.g. with

ActivityRetainedScoped

. The only idea that come to my mind is using

finalize

but it seems to be a bad practice and doesn't seems to be reliable - as I understand there's no guarantee it'll be called on time. Usually

Closeable

is used in such situations, I've tried implementing it but Dagger doesn't seems to be checking it.

Colton Idle

02/08/2023, 7:20 PM

I've never used dagger/hilt in a multi-module setup. Lets say I have

app

gradle module which depends on

service

. And

service

inside has

SomeServiceClass

. Would

service

gradle module have a @Module and @Provides, providing the

SomeServiceClass

app

gradle module? Or is it more customary for the

service

gradle module to declare what it provides?

Colton Idle

02/09/2023, 10:20 PM

I did it! 😂

👍 2

Colton Idle

02/10/2023, 4:15 PM

I have an

:app

module and then a

network

module. I want the network module to expose services like BooksService and LibraryService. Those two services require a OkHttpClient. I can also add a provider for the http client, but then okhttpClient provider is exposed to the app. Anyway to hide that "internal" dependency with dagger?

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networkModule's provider declaration:

@Provides
fun provideBooksService(okHttpClient: OkHttpClient): BooksService {
  return NetworkBackedBooksService(okHttpClient)
}

@Provides
fun provideLibraryService(okHttpClient: OkHttpClient): LibraryService {
  return NetworkBackedLibraryService(okHttpClient)
}

@Provides
fun providesHttpClient(): OkHttpClient {
  return //...
}

Dave Scheck

02/14/2023, 9:29 PM

I understand that you can use

Assisted Injection

to pass runtime parameters into objects being injected. What I haven't been able to figure out is how to use that (or another mechanism) to choose the type of object being injected based on a runtime parameter. For example, without using DI I might do something like this

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class RepoDataSourceScreenViewModel: ViewModel() {
    var isSimulated = lookupIsSimulated()

    val repository = ComponentRepository(isSimulated)
    
    // This would be backed by a DB/sharedPref lookup
    private fun lookupIsSimulated(): Boolean  = false
    
}

class ComponentRepository(val isSimulated: Boolean) {
    val dataSource = if(isSimulated) RealComponentDataSource() else SimComponentDataSource()
}

abstract class ComponentDataSource()
class RealComponentDataSource() {}
class SimComponentDataSource() {}

Is there an equivalent be in a Dagger/Hilt environment?

ursus

02/19/2023, 2:26 AM

When dagger moves to KSP, is it then KMM ready by default? or more work is needed

Colton Idle

02/23/2023, 10:20 PM

If I'm using dagger/hilt and I have a bunch of gradle modules. And each gradle module provides their own OkhttpInterceptor for example, is it possible to grab all available objects of that type and add them all to okhttps interceptor list?