使用Akka调度器处理期货

Question

我有一个基于喷雾的HTTP服务。我有一个在这个HTTP应用程序内部运行的流。现在由于这个流要做大量的I/O，所以我决定使用一个单独的线程池。我查阅了Akka文档，看看我可以做些什么来使我的线程池是可配置的。我在Akka遇到了调度器的概念。所以我尝试在application.conf中使用它如下所示：

akka {
  io-dispatcher {
    # Dispatcher is the name of the event-based dispatcher
    type = Dispatcher
    # What kind of ExecutionService to use
    executor = "fork-join-executor"
    # Configuration for the fork join pool
    fork-join-executor {
      # Min number of threads to cap factor-based parallelism number to
      parallelism-min = 2
      # Parallelism (threads) ... ceil(available processors * factor)
      parallelism-factor = 2.0
      # Max number of threads to cap factor-based parallelism number to
      parallelism-max = 10
    }
    # Throughput defines the maximum number of messages to be
    # processed per actor before the thread jumps to the next actor.
    # Set to 1 for as fair as possible.
    throughput = 20
  }
}

在我的执行元中，我尝试将此配置查找为：

context.system.dispatchers.lookup("akka.io-dispatcher")

当我运行我的服务时，我得到以下错误：

[ERROR] [05/03/2016 12:59:08.673] [my-app-akka.actor.default-dispatcher-2] [akka://my-app/user/myAppSupervisorActor] Dispatcher [akka.io-dispatcher] not configured
akka.ConfigurationException: Dispatcher [akka.io-dispatcher] not configured
    at akka.dispatch.Dispatchers.lookupConfigurator(Dispatchers.scala:99)
    at akka.dispatch.Dispatchers.lookup(Dispatchers.scala:81)

Answer 1

配置正确。您需要做的只是将加载的配置文件传递给Akka ActorSystem，如下所示：

ActorSystem("yourActorSystem", ConfigFactory.load())