KOtlin DEpendency INjection

KODEIN is a straightforward and yet very useful dependency retrieval container. it is effortless to use and configure.

KODEIN works on all Kotlin Multiplatform targets:

• JVM / Android.
• all Native platforms (iOS, macOS, Linux, Windows, WebAssembly).
• Javascript / WasmJs.

KODEIN allows you to:

• Lazily instantiate your dependencies when needed
• Stop caring about dependency initialization order
• Bind classes or interfaces to their instance or provider
• Debug your dependency bindings and recursions

KODEIN provides extensions to be integrable into:

• Android
• Compose (Android / Desktop / Web)
• Ktor

An example is always better than a thousand words:

val di = DI {
    bindProvider<Dice> { RandomDice(0, 5) }
    bindSingleton<DataSource> { SqliteDS.open("path/to/file") }
}

class Controller(private di: DI) {
    private val ds: DataSource by di.instance()
}

KODEIN is a good choice because:

• It proposes a very simple and readable declarative DSL
• It is not subject to type erasure (as Java is)
• It integrates nicely with Android
• It proposes a very kotlin-esque idiomatic API
• It is fast and optimized (makes extensive use of inline)

Installation

Kodein is available on Maven Central.

repositories {
    mavenCentral()
}

kotlin {
    sourceSets {
        commonMain {
            dependencies {
                implementation("org.kodein.di:kodein-di:{version}")
            }
        }
    }
}

KODEIN 7+ is the current major version, but documentation is available for previous versions.

Kodein documentation

Kotlin & JVM compatibility

Full table can be found here

Support

Support is held in the Kodein Slack channel (you can get an invitation to the Kotlin Slack here).

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If you are using KODEIN, please let us know!