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Extension Manager

Here is a brief description of KoinExtension manager, dedicated to add new features inside Koin framework.

Defining an extension​

A Koin extension consist in having a class inheriting from KoinExtension interface:

interface KoinExtension {
    
    var koin : Koin
    
    fun onClose()
}

this interface allow to ensure you get passed a Koin instance, and the extension is called when Koin is closing.

Starting an extension​

To start an extension, just extend the right place of the system, and register it with Koin.extensionManager.

Below here is how we define the coroutinesEngine extension:

fun KoinApplication.coroutinesEngine() {
    with(koin.extensionManager) {
        if (getExtensionOrNull<KoinCoroutinesEngine>(EXTENSION_NAME) == null) {
            registerExtension(EXTENSION_NAME, KoinCoroutinesEngine())
        }
    }
}

Below here is how we call the coroutinesEngine extension:

val Koin.coroutinesEngine: KoinCoroutinesEngine get() = extensionManager.getExtension(EXTENSION_NAME)