val service = factory.createWithContext(context) { hello("Bar") }

factory.createWithContext {context -> hello("Bar") }

fun someFun(callParam, context) {
    factory.createServiceFoo(context).hello(callParam)
}

fun someFun(callParam, context) {
    factory.createWithContext(context) {
        hello(callParam)
    }
}

fun someFun(callParam, context) {
    factory.createWithContext { context ->
        hello(callParam)
    }
}

context

{ context -> ... }

fun <R> with(context: Context, block: Api.() -> R): R {
        val service = Api(baseClinet.addHeader(context))
        return service.block()
    }

val retVal: String = serviceFoo.with(HttpContext) { hello("WithContext")  }

class ServiceFoo {
    private val baseClient = Client()
    

    internal fun <R> with(context: Context, block: Api.() -> R): R {
        val service = Api(baseClient.addHeader(context))
        return service.block()
    }

    internal class Api(private val enhancedClient: Client) {
        fun hello(name: String): String {
            enhancedClient.getMethod(name)
            return name
        }


        fun hello2(name: String): Int {
            enhancedClient.getMethod(name)
            return 2
        }
    }
}

fun main(args: Array<String>) {
    val serviceFoo = ServiceFoo()


    val retVal: Int = serviceFoo.with(HttpContext) {
        hello2("WithContext")
    }
}

ServiceFooFactory

Api

ServiceFoo

internal fun <R> with(context: Context, block: Api.() -> R): R = Api(baseClient.addHeader(context)).run(block)