在另一个库中配置 ActorSystem答案

【问题标题】：Configure ActorSystem in another library在另一个库中配置 ActorSystem
【发布时间】：2019-11-06 03:05:57
【问题描述】：

我的应用程序使用一个库，该库在内部初始化一个像这样的演员系统

ActorSystem("MySys")

因此，MySys actor 系统使用默认调度程序。我想为这个特定的演员系统使用自定义调度程序。如何在我的application.conf 中覆盖此库的演员系统使用的调度程序？

我已经尝试过这样做

MySys {
  akka {
    actor {
      default-dispatcher = "my-dispatcher"
    }

    my-dispatcher {
      type = Dispatcher
      executor = "thread-pool-executor"
      thread-pool-executor {
        fixed-pool-size = 85
      }
    }

  }
}

但是这不起作用，因为线程转储显示以下输出

"MySys-akka.actor.default-dispatcher-6" #396 prio=5 os_prio=0 tid=0x00007f54501b6000 nid=0x1a6 waiting on condition [0x00007f55285f3000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000000e4b5b1f0> (a akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinPool)
        at akka.dispatch.forkjoin.ForkJoinPool.scan(ForkJoinPool.java:2075)
        at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

"MySys-akka.actor.default-dispatcher-5" #363 prio=5 os_prio=0 tid=0x00007f545c006800 nid=0x185 waiting on condition [0x00007f5443acf000]
   java.lang.Thread.State: TIMED_WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000000e4b5b1f0> (a akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinPool)
        at akka.dispatch.forkjoin.ForkJoinPool.idleAwaitWork(ForkJoinPool.java:2135)
        at akka.dispatch.forkjoin.ForkJoinPool.scan(ForkJoinPool.java:2067)
        at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

"MySys-akka.actor.default-dispatcher-4" #362 prio=5 os_prio=0 tid=0x00007f55402e0000 nid=0x184 waiting on condition [0x00007f54445da000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000000e4b5b1f0> (a akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinPool)
        at akka.dispatch.forkjoin.ForkJoinPool.scan(ForkJoinPool.java:2075)
        at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

"MySys-akka.actor.default-dispatcher-3" #361 prio=5 os_prio=0 tid=0x00007f55402df000 nid=0x183 waiting on condition [0x00007f5539774000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000000e4b5b1f0> (a akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinPool)
        at akka.dispatch.forkjoin.ForkJoinPool.scan(ForkJoinPool.java:2075)
        at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

"MySys-akka.actor.default-dispatcher-2" #360 prio=5 os_prio=0 tid=0x00007f55402de800 nid=0x182 waiting on condition [0x00007f5440f31000]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00000000e4b5b1f0> (a akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinPool)
        at akka.dispatch.forkjoin.ForkJoinPool.scan(ForkJoinPool.java:2075)
        at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

"MySys-scheduler-1" #359 prio=5 os_prio=0 tid=0x00007f55402dd800 nid=0x181 waiting on condition [0x00007f54440d5000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
        at java.lang.Thread.sleep(Native Method)
        at akka.actor.LightArrayRevolverScheduler.waitNanos(LightArrayRevolverScheduler.scala:85)
        at akka.actor.LightArrayRevolverScheduler$$anon$4.nextTick(LightArrayRevolverScheduler.scala:265)
        at akka.actor.LightArrayRevolverScheduler$$anon$4.run(LightArrayRevolverScheduler.scala:235)
        at java.lang.Thread.run(Thread.java:748)

【问题讨论】：

标签： java scala akka typesafe-config

【解决方案1】：

如果在构建新的 ActorSystem 时没有传递任何配置，则将使用根配置（即 akka 密钥中的所有内容）

在configuration section of the akka docs 中，建议您在同一应用程序中初始化两个不同的参与者系统，具体方法是使用单独的配置对其进行初始化。

val config = ConfigFactory.load()
val system1 = ActorSystem("MySys", config.getConfig("MySys"))
val system2 = ActorSystem("my-app", config.getConfig("my-app"))

如果您无法影响第一个系统的创建方式，我建议您在 MySys 的配置中使用默认的 akka 区域，然后为您的应用程序所需的配置命名空间。

【讨论】：