使用Scala节流器改变每条消息之间的时间
使用Scala节流器改变每条消息之间的时间
提问于 2021-01-30 23:12:43
我正在学习Akka，并编写了以下代码来限制发送到TradeAction参与者的消息数量。每秒最多发送3条消息。是否可以修改节流器，以便设置每条消息之间的时间？例如，message1和message2之间延迟2秒，message2和message3之间延迟1秒。
import akka.NotUsed
import akka.actor.{Actor, ActorRef, ActorSystem, Props}
import akka.stream.{ActorMaterializer, OverflowStrategy}
import akka.stream.scaladsl.{Sink, Source}
import systemconfig.ActorSystemConfig
import scala.concurrent.duration.DurationInt
case class Action(side: String)
object PlaceTrade {
val actorSystem = ActorSystem("firstActorSystem")
println(actorSystem.name)
object TradeAction {
def props(action : String) = Props(new TradeAction(action))
}
class TradeAction(actorName: String) extends Actor {
override def receive: Receive = {
case "Buy" => {
val r = requests.get("http://www.google.com")
println("r status code is "+r.statusCode)
println("Buy")
println("")
}
case "Sell" => {
val r = requests.get("http://www.google.com")
println("r status code is "+r.statusCode)
println("Sell")
println("")
}
case _ =>
}
}
implicit val materializer = ActorMaterializer.create(ActorSystemConfig.getActorSystem)
def getThrottler(ac: ActorRef) = Source.actorRef(bufferSize = 1000, OverflowStrategy.dropNew)
.throttle(1, 3.second)
.to(Sink.actorRef(ac, NotUsed))
.run()
def main(args: Array[String]): Unit = {
val tradeAction = actorSystem.actorOf(TradeAction.props("TradeAction"))
val throttler = getThrottler(tradeAction)
val l = List(Action("Buy"),Action("Buy"),Action("Buy"),Action("Sell"))
l.foreach(action => {
throttler ! action.side
})
}
}Stack Overflow用户
回答已采纳
发布于 2021-01-31 00:33:50
您可以使用delayWith来实现这一点，它允许一个(可能有状态的)方法来定义此元素延迟多长时间(无需重新排序元素)，例如：
import akka.stream.scaladsl.{ DelayStrategy, DelayOverflowStrategy }
import scala.concurrent.duration.FiniteDuration
def decliningDelay(): DelayStrategy[Any] =
new DelayStrategy {
var nextDelaySeconds: Option[Int] = None
def nextDelay(elem: Any): FiniteDuration =
nextDelaySeconds match {
case None =>
nextDelaySeconds = 2
0.seconds
case Some(delay) if delay > 0 =>
nextDelaySeconds = delay - 1
delay.seconds
case _ => 0.seconds
}
}
def getThrottler(ac: ActorRef): ActorRef =
Source.actorRef(bufferSize = 1000, OverflowStrategy.dropNew)
.delayWith(() => decliningDelay(), DelayOverflowStrategy.backpressure)
.to(Sink.actorRef(ac, NotUsed))
.run()您可以将delayWith与throttle结合使用；我可能会将delayWith放在throttle之前。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/65969576
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