As not to revive a dead thread, what's a use case ...

# kodein

[ian.shaun.thomas]

As not to revive a dead thread, what's a use case for allProviders as mentioned here: https://kotlinlang.slack.com/archives/C0BLU9K96/p1615530173009900?thread_ts=1615493023.009800&cid=C0BLU9K96

[Big Chungus]

Here's a use-case of extended version of this https://github.com/Kodein-Framework/Kodein-DI/issues/361

[Joost Klitsie]

I use it for KTOR to register my components

[Joost Klitsie]

and initialize my db's

[Joost Klitsie]

for (bind in di().container.tree.bindings) {
                        val bindClass = bind.key.type.jvmType as? Class<*>?
                        if (bindClass != null && Component::class.java.isAssignableFrom(bindClass)) {
                            val res by di().Instance(bind.key.type, bind.key.tag)
                            println("Registering '$res' routes...")
                            with(res as Component) {
                                installRouting(this@routeWithRules)
                            }
                        }
                    }

[Joost Klitsie]

If I launch my application in Microservice mode, I actually check if there is any DB repository in my DI. If not, I do not initialize a connection to the database

[Joost Klitsie]

di().container.tree.bindings.mapNotNull { bind ->
        val bindClass = bind.key.type.jvmType as? Class<*>?
        if (bindClass != null && DBRepository::class.java.isAssignableFrom(bindClass)) {
            val res by di().Instance(bind.key.type)
            res as DBRepository<*, *>
        }
        else {
            null
        }
    }.onNotEmpty { dbRepositories ->
        Database.connect(hikari())
        transaction {
            dbRepositories.forEach { dbRepository ->
                dbRepository.initialize()
            }
        }
    }

[Joost Klitsie]

I will btw refactor this to use the allProviders 😄

[Big Chungus]

@Joost Klitsie, allProviders will not give you tags, though and will also filter out all tagged bindings

[Big Chungus]

So your way currently is the only way to achieve this (hopefully my issue above will get accepted soon to streamline this with allProviderBindings API)

[Joost Klitsie]

ohh that is good to know!

[Joost Klitsie]

thanks for the heads up

[ian.shaun.thomas]

Interesting. For those scenarios I use the multi-binding solution which I think is effectively the same outcome.

https://docs.kodein.org/kodein-di/7.4/core/multi-binding.html

[ian.shaun.thomas]

I guess not for the initialization solution described though, just for "static" instances

[ian.shaun.thomas]

thank you for clarifying everyone 👍