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공식적으로는 ASK패턴으로 액터에게 메시지를 보내는 패턴은 크게는 두가지가 있습니다.
- tell : send이후 응답값이 없어 just tell하는 경우응답값을 대기할 필요 없는 방식 just tell로 forgot and fire
- ask : send이후 응답값을 대기하는경우필요로하는경우 대기해야하는 케이스
자바가 기본 제공하는 CompletionStage가 맘에 안들기도 해서, ASK 패턴을 4가지 방식을 이용하는 코드를 작성 코르틴을 위한 유틸 클래스도 생성
Akka HTTP를 사용하면 더 심플하게 이용할수 있지만 코프링기반에 취향에 맞는 방식으로 통일할수 있습니다.
- CompletionStage AkkaStream- 자바기본
- Async ( 코르틴 ) - Async가 없는 자바에서 Async/Await를 지원
- Mono ( WebFlux ) - Webplux 의 비동기 처리
- AkkaStream - AKKA의 Stream처리로 Java9 Stream API와 유사
| Code Block | ||
|---|---|---|
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@RestController
@RequestMapping("/api/admin/channel")
class AdminChannelController(private val actorSystem: ActorSystem<MainStageActorCommand>,
private val supervisorChannelActor: ActorRef<SupervisorChannelCommand>) {
private val timeout: Duration = Duration.ofSeconds(5)
@GetMapping("/list-counselor-managers")
fun listCounselorManagers(): CompletionStage<List<String>>? {
return AskPattern.ask(
supervisorChannelActor,
{ replyTo: ActorRef<SupervisorChannelResponse> -> GetAllCounselorManagers(replyTo) },
timeout,
actorSystem.scheduler()
).thenApply { response ->
when (response) {
is AllCounselorManagers -> response.channels
else -> emptyList()
}
}
}
@GetMapping("/list-counselor-managers-stream")
fun listCounselorManagersByStream(): CompletionStage<List<String>> {
return Source.single(Unit)
.mapAsync(1) {
AskPattern.ask(
supervisorChannelActor,
{ replyTo: ActorRef<SupervisorChannelResponse> -> GetAllCounselorManagers(replyTo) },
timeout,
actorSystem.scheduler()
)
}
.runWith(Sink.head(), actorSystem)
.thenApply { response ->
when (response) {
is AllCounselorManagers -> response.channels
else -> emptyList()
}
}
}
@GetMapping("/list-counselor-managers-async")
fun listCounselorManagersByCoroutines(): List<String> {
val response = AkkaUtils.runBlockingAsk(
supervisorChannelActor,
{ replyTo: ActorRef<SupervisorChannelResponse> -> GetAllCounselorManagers(replyTo) },
timeout, actorSystem
)
return when (response) {
is AllCounselorManagers -> response.channels
else -> emptyList()
}
}
@GetMapping("/list-counselor-managers-mono")
fun listCounselorManagersByMono(): Mono<List<String>> {
return AkkaUtils.askActorByMono(
supervisorChannelActor,
{ replyTo: ActorRef<SupervisorChannelResponse> -> GetAllCounselorManagers(replyTo) },
timeout,
actorSystem
).map { response ->
when (response) {
is AllCounselorManagers -> response.channels
else -> emptyList()
}
}
} |
- 더 줄이고 싶지만 여기까지, 개인적으로 코르틴의 async 방식이 군더더기가 없는듯
| Code Block | ||
|---|---|---|
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package com.example.kotlinbootlabs.module
import akka.actor.typed.ActorRef
import akka.actor.typed.ActorSystem
import akka.actor.typed.javadsl.AskPattern
import java.time.Duration
import kotlinx.coroutines.future.await
import kotlinx.coroutines.runBlocking
object AkkaUtils {
suspend fun <T, R> askActor(
actor: ActorRef<T>,
message: (ActorRef<R>) -> T,
timeout: Duration,
actorSystem: ActorSystem<*>
): R {
return AskPattern.ask(
actor,
message,
timeout,
actorSystem.scheduler()
).await()
}
fun <T, R> runBlockingAsk(
actor: ActorRef<T>,
message: (ActorRef<R>) -> T,
timeout: Duration,
actorSystem: ActorSystem<*>
): R = runBlocking {
askActor(actor, message, timeout, actorSystem)
}
fun <T, R> askActorByMono(
actor: ActorRef<T>,
message: (ActorRef<R>) -> T,
timeout: Duration,
actorSystem: ActorSystem<*>
): Mono<R> {
return Mono.fromCompletionStage(
AskPattern.ask(
actor,
message,
timeout,
actorSystem.scheduler()
)
)
}
} |
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