InstanceType

sealed interface InstanceType<T> {
    fun interface Factory<T> : InstanceType<T> {
        fun build(): T
    }

    fun interface ParamFactory<T> : InstanceType<T> {
        fun build(vararg params: Any): T

        class Params {
            var parameters: Array<out Any> = arrayOf()
                private set

            fun params(vararg parameters: Any) {
                this.parameters = parameters
            }
        }
    }

    class Singleton<T>(private val factory: Factory<T>) : InstanceType<T> {
        val instance: T by lazy {
            factory.build()
        }
    }
}