Blocking-Call.kt

fun blockingMvc() =
    run {
        // action 1, cost 100ms
        val delay100res = getBlockingResponse(100)!!["totalTimeMillis"].parseLong()
        // action 2, cost 200ms
        val delay200res = getBlockingResponse(200)!!["totalTimeMillis"].parseLong()

        // action 3, need return value from action 1 and 2, cost 300ms
        val delay300req = getBlockingResponse(delay100res + delay200res)!!["totalTimeMillis"].parseLong()

        // action 4, cost 400ms
        val delay400req = getBlockingResponse(delay300req + 100)!!["totalTimeMillis"].parseLong()
        // action 5, cost 500ms
        val delay500req = getBlockingResponse(delay300req + 200)!!["totalTimeMillis"].parseLong()

        mapOf(
            "delay100req" to delay100res,
            "delay200req" to delay200res,
            "delay300req" to delay300req,
            "delay400req" to delay400req,
            "delay500req" to delay500req
        )
    }

private fun getBlockingResponse(ms: Long) = webClient.get()
    .uri("http://$domain:8888/delay/ms/$ms")
    .retrieve()
    .bodyToMono(object : ParameterizedTypeReference<Map<*, *>>() {})
    .block()