Akka http客户端上的断路器可以'；失败后不要退缩

akka http客户端上断路器的一个示例看起来非常简单，但对我来说，它不起作用

object HttpWithCircuitBreaker extends App {
  implicit val system = ActorSystem()
  implicit val materializer = ActorMaterializer()
  implicit val ec = system.dispatcher
  val breaker =
    new CircuitBreaker(
      system.scheduler,
      maxFailures = 2,
      callTimeout = 3.seconds,
      resetTimeout = 25.seconds)
      .onOpen(println("circuit breaker opened"))
      .onClose(println("circuit breaker closed"))
      .onHalfOpen(println("circuit breaker half-open"))
  while (true) {
    val futureResponse: Future[HttpResponse] = Http().singleRequest(HttpRequest(uri = "https://www.random.org/integers/?num=1&min=1&max=6&col=1&base=10&format=plain&rnd=new"))
    breaker.withCircuitBreaker(futureResponse).map(resp => resp.status match {
      case Success(_) =>
        resp.entity.dataBytes.runWith(Sink.ignore)
        println("http success")
      case _ =>
        resp.entity.dataBytes.runWith(Sink.ignore)
        println(s"http error ${resp.status.intValue()}")
    }).recover {
      case e@_ =>
        println(s"exception ${e.getMessage}")
    }
    Thread.sleep(1000)
  }
}

它从完美的随机数开始。它在断开网络连接时打开，但在重新连接时从不关闭。从日志中可以看到，有人试图恢复，但由于超时而失败：

http success
http success
http success
exception Tcp command [Connect(www.random.org:443,None,List(),Some(10 seconds),true)] failed
exception Circuit Breaker Timed out.
circuit breaker opened
exception Tcp command [Connect(www.random.org:443,None,List(),Some(10 seconds),true)] failed
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker Timed out.
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
circuit breaker half-open             <--- new http call should start here
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker Timed out.  <--- but it fails with timeout
circuit breaker opened
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast
exception Circuit Breaker is open; calls are failing fast

http成功
http成功
http成功
异常Tcp命令[Connect（www.random.org:443，None，List（），Some（10秒），true）]失败
异常断路器超时。
断路器断开
异常Tcp命令[Connect（www.random.org:443，None，List（），Some（10秒），true）]失败
异常断路器开路；电话故障很快
异常断路器超时。
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
异常断路器开路；电话故障很快
断路器半开为使断路器正常工作，此
val

val futureResponse: Future[HttpResponse] = Http().singleRequest(...)

应该是
def

def futureResponse: Future[HttpResponse] = Http().singleRequest(...)

断路器需要包装异步调用-如果使用
val
，则异步调用将在断路器外部启动

另外：不要在代码中使用Thread.sleep，尝试使用-e.g.-Akka
 谢谢。我终于明白了那是怎么回事。