异步Java Akka在使用路由器时的并发限制？

Question

代码是：

public class TestAkka {

    public static void main(String[] args) throws InterruptedException {

        ActorSystem system = ActorSystem.create("ExampleRouter", ConfigFactory.load().getConfig("MyRouter"));
        ActorRef router = system.actorOf(Props.create(Hello.class).withRouter(new FromConfig()), "exampleRouter");

        for (int i = 0; i < 100; i++) {
            router.tell(new Website().getNameByIndex(i), router);
        }
    }

    public static class Hello extends UntypedActor {

        @Override
        public void onReceive(Object message) throws Exception {
            if (message instanceof String) {
                System.out.println("Hello " + message);
                URL url = new URL("http://" + message + ":80");
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                System.out.println(conn.getResponseCode());
                Thread.sleep(10000);  // <-- Sim the job take a short time
            } else {
                unhandled(message);
            }
        }
    }
}

应用程序。配置文件是：

MyRouter{
    akka {
        actor {
            deployment {
                /exampleRouter {
                    router = round-robin-pool
                    nr-of-instances = 100
                }
            }
        }
    }
}

结果是，我每次只能看到8个并发作业在运行，但我的预期是100个并发作业应该同时运行！还需要任何设置吗

更新日期：2016/06/06： 我已经修改了我的代码，结果是我的期望覆盖了应用程序。现在，它可以同时运行100个并发作业。实际上，如何优化高并发应用程序的默认调度程序

String s = ""
        + "akka {\n"
        + "    actor {\n"
        + "        deployment {\n"
        + "            /router {\n"
        + "                router = round-robin-pool\n"
        + "                nr-of-instances = 10000\n"
        + "            }\n"
        + "        }\n"
        + "        default-dispatcher {\n"
        + "            fork-join-executor {\n"
        + "                parallelism-min = 200\n"
        + "                parallelism-max = 5000\n"
        + "            }\n"
        + "        }\n"
        + "    }\n"
        + "}\n";
ActorSystem as = ActorSystem.create("as", ConfigFactory.parseString(s));
ActorRef ar = as.actorOf(Props.create(Hello.class).withRouter(new FromConfig()), "router");

Answer 1

你对Thread.sleep的调用会阻塞线程，所以你的线程已经用完了。如果想看到所有100个线程，应该在它们自己的专用线程上运行阻塞操作