我如何限制发送给 Akka 中的 IO(Tcp) actor 的消息

Question

我有这样的演员

class TcpClientActor(target: Target) extends Actor with Logger {

  override def preStart(): Unit = {
    self ! TestConnection
  }

  override def receive: Receive = {
    case TestConnection =>
      IO(Tcp) ! Connect(remoteAddress = new InetSocketAddress(target.endpoint, target.port), localAddress = None, options = Nil, timeout = Some(timeout), pullMode = false)

    case failed@CommandFailed(_: Connect) =>
      info(s"Failure: $target.endpoint:$target.port")
      shutdown()

    case Connected(_, _) =>
      info(s"Success: $target.endpoint:$target.port")
      sender() ! Close
      shutdown()

  }

  def shutdown(): Unit = {
    context stop self
  }
}

我正在迭代一个文件，其中包含要测试的端点，并创建其中一个参与者，每一行都作为 Target 类型的构造函数参数。我希望能够将并行 TCP 连接的数量限制为某个设定的数量，我可以在 Akka 中使用内置机制来确保我不会通过立即创建一个 TcpClientActor 来使系统过载对于每一行输入并启动套接字连接？

Answer 1

我会使用 Akka Stream 来限制消息

import scala.concurrent.duration._
import akka.NotUsed
import akka.actor.ActorRef
import akka.stream.{ ActorMaterializer, OverflowStrategy, ThrottleMode }
import akka.stream.scaladsl.{ Sink, Source }

object TcpThrottle {
  def throttler(ratePerSecond: Int, burstRate: Option[Int], bufferSize: Int = 1000)(implicit materializer: ActorMaterializer): ActorRef =
    Source.actorRef(bufferSize = bufferSize, OverflowStrategy.dropNew)
      .throttle(ratePerSecond, 1.second, burstRate.getOrElse(ratePerSecond), ThrottleMode.Shaping)
      .to(Sink.actorRef(IO(Tcp), NotUsed)
      .run()
 }

class TcpClientActor(target: Target) extends Actor with Logger {
  val throttler = TcpThrottle.throttler(1, Some(5))

  // otherwise identical

  def receive: Receive = {
    case TestConnection => throttler ! Connect(remoteAddress = new InetSocketAddress(target.endpoint, target.port), localAddress = None, options = Nil, timeout = Some(timeout), pullMode = false)

    // other cases identical
  }
}

改编自The Akka 2.5 migration guide。可能有必要

我如何限制发送给 Akka 中的 IO(Tcp) actor 的消息

How can I throttle messages to the IO(Tcp) actor in Akka

io

scala

actor

akka