Hi, could someone please share a complete example ...

# kodein

[nimrod]

Hi, could someone please share a complete example how to use scopes? What I’m trying to do: I have a singleton which needs to be recreated when the server environment is changed from Test to Prod via the debug menu. I figured I should use scopes for that, but the documentation doesn’t have a complete working example that is easy to follow.

[nimrod]

@salomonbrys maybe you can help?

[salomonbrys]

I can work on a simple example.

[nimrod]

cool thanks!

[nimrod]

The singleton I have is passed a URL string to its constructor based on what is selected in the debug menu - prod vs test. It would be really helpful if your example relates to it 🙂

[salomonbrys]

Have you read https://docs.kodein.org/kodein-di/7.1/core/using-environment.html#scope-creation ?

[nimrod]

yes

[salomonbrys]

There you go: https://gist.github.com/SalomonBrys/121cd7ebdd94a771d878e86d4729545d

[salomonbrys]

This sample features a very simple EnvironmentScope that do not clear the memory when changing environment, and a more complex OneEnvironmentScope that do clear the memory when changing scope.
Note that this sample is for JVM only. I could adapt it to KMP, if you need me to.

[nimrod]

@salomonbrys Thanks a lot! I have one question though. In my case, the current environment comes from a singleton instance of a class called DebugHelper. which is also provided via Kodein. How should I get it for calling registerContextFinder() ?

[nimrod]

val applicationModule: DI.Module = DI.Module("ApplicationModule") {
    // How to get debugHelper instance here?
    registerContextFinder<Environment> { debugHelper.env }
    bind() from scoped(OneEnvironmentScope).singleton {
       // instance setup here
    }
}

[salomonbrys]

@nimrod, contextFinder cannot access DI right now.
It should.
Can you open a ticket in Kodein-DI github issues ?

[salomonbrys]

In the meantime, this works (but makes my eyes bleed):

lateinit var di: DI

di = DI {
    bind() from singleton { CurrentEnvironment(Environment.PROD) }

    // Choose one:
    //bind() from scoped(EnvironmentScope).singleton { API(context.baseUrl) }
    bind() from scoped(OneEnvironmentScope).singleton { API(context.baseUrl) }

    // This is needed to provide Kodein-DI the mean to find the current env.
    registerContextFinder<Environment> { di.direct.instance<CurrentEnvironment>().env }
}

[nimrod]

@salomonbrys thanks once again! in my case I use DI.Module("ApplicationModule") { which doesn’t seem to have access to direct. Am I missing something?

[salomonbrys]

Ouch... You're being too clean 😞
You'll have to wait for our next release, we'll try to be quick.

[nimrod]

Hehe ok nevermind, thanks!