Hi I am rather new to dipendency injection with ko...

# koin

[Roger Kreienbühl]

Hi
I am rather new to dipendency injection with koin and koin-annotations. I have a kmp project with a ktor server and iOS and Android apps. the base setup works fine. Now I tried to define a class inside the shared gradle module and annotate it with @Single :

package com.example.data.mapper
import org.koin.core.annotation.Single

@Single
class XyzDtoMapper {
...
}

I try to scan for this class with a module defined inside the server gradle module:

package com.example.di

import org.koin.core.annotation.ComponentScan
import org.koin.core.annotation.Module

@Module
@ComponentScan("com.example.data.mapper")
class MapperModule

Is such a Scan over multiple gradle modules possible, and if do, how can I achieve this?
The Mapper module is generated but the XyzDtoMapper is not present in it.

[Kibet Theophilus]

It should work in multiple modules, can you share a reproducer?

[Mantas Varnagiris]

I have a similar issue that I'm trying to resolve. I have multiple kmp modules and scan works well in the androidApp module. But I have another kmp module that we use for aggregating things for iOS and in that module the file is generated but it does not pick up the dependencies so the koin module is empty

[Roger Kreienbühl]

@Kibet Theophilus Here I have a small example:
https://github.com/rkreienbuehl/koin-example
Maybe I am missing some configuration?
(In this example I only implemented koin for the server and shared modules)

[Kibet Theophilus]

@Roger Kreienbühl I had missed the question😬, the scan only works for a single module...AFAIK

[Roger Kreienbühl]

@Kibet Theophilus Ok, thanks for the clarification. In the meantime I found a workaround.
I added a SharedMapperModule inside the shared gradle module:

@Module
@ComponentScan("dev.kreienbuehl.swissclimbing.data.mapper")
class SharedMapperModule

and changed MapperModule inside the server as followed:

@Module(
    includes = [
        SharedMapperModule::class
    ]
)
@ComponentScan("dev.kreienbuehl.swissclimbing.data.mapper")
class MapperModule

What i didn't see anywhere in the docs was how to get the shared module to generate the generated koin files. I figured that out by investigating the example listed in the docs.

I had to add this to the `build.gradle.kts`of the shared module:

dependencies {
    // KSP Tasks
    add("kspCommonMainMetadata", libs.koin.ksp.compiler)
}

tasks.withType<KotlinCompile>().configureEach {
    if (name != "kspCommonMainKotlinMetadata") {
        dependsOn("kspCommonMainKotlinMetadata")
    }
}

afterEvaluate {
    tasks.filter {
        it.name.contains("SourcesJar", true)
    }.forEach {
        println("SourceJarTask====>${it.name}")
        it.dependsOn("kspCommonMainKotlinMetadata")
    }
}

Don't know if this is the best way, but it works.

[Kibet Theophilus]

glad it works, doc setup should be here...needs some updates though - https://insert-koin.io/docs/reference/koin-annotations/kmp#ksp-setup

[Roger Kreienbühl]

These docs I found, but the part with

tasks.withType<KotlinCompile>().configureEach {
    if (name != "kspCommonMainKotlinMetadata") {
        dependsOn("kspCommonMainKotlinMetadata")
    }
}

afterEvaluate {
    tasks.filter {
        it.name.contains("SourcesJar", true)
    }.forEach {
        println("SourceJarTask====>${it.name}")
        it.dependsOn("kspCommonMainKotlinMetadata")
    }
}

is not mentioned in it. Withoout it, the code was not generated in my case. In the linked example app https://github.com/InsertKoinIO/hello-kmp/tree/annotations
I found this as workaround instead of adding

dependencies {
    // KSP Tasks
    add("kspCommonMainMetadata", libs.koin.ksp.compiler)
}

but I needed both that it worked for the server.