fun getHandlerMethod(handler: Handler<*, *>) : KFunction1<*, *> {
    val inputType = handler::class.supertypes.first { Handler::class == it.jvmErasure }.arguments[0].type!!
    return handler::class.memberFunctions.first {
        it.name == “invoke” &&
        it.valueParameters.size == 1 &&
        it.visibility == KVisibility.PUBLIC &&
        it.valueParameters[0].type == inputType
    }
}