java - Akka:自定义 akka 监督策略未使用 Java 注册

Question

我将探索 Akka 生命周期和 Akka 参与者监督策略。我正在创建自己的异常并重写 public SupervisorStrategy SupervisorStrategy() 方法来探索 akka 的生命周期及其恢复策略。以下是我的代码:

public class JavaActor extends AbstractActor {

@Override
public PartialFunction<Object, BoxedUnit> receive() {
    System.out.println("----   In the receive method "+Thread.currentThread().getName());
    return ReceiveBuilder.
            matchEquals("Ping" , s -> {
                System.out.println("$$$ Ping Match Successfully");
                throw new EsclateException("Might be esclate");
            }).
            matchAny(x -> {
                System.out.println("### Matched value is :  "+ x);
                sender().tell(new Status.Failure(new Exception("unknown message")), self());
            }).build();
}

@Override
public void preRestart(Throwable reason, Option<Object> message) throws Exception {
    super.preRestart(reason, message);
    System.out.println(">>> Actor preRestart method calls : "+Thread.currentThread().getName());
}

@Override
public void postRestart(Throwable reason) throws Exception {
    super.postRestart(reason);
    System.out.println(">>> Actor postRestart method calls : "+Thread.currentThread().getName());
}

@Override
public void preStart() throws Exception {
    super.preStart();
    System.out.println(">>> Actor preStart method calls "+Thread.currentThread().getName());
}

@Override
public void postStop() throws Exception {
    super.postStop();
    System.out.println(">>> Actor postStop method calls "+Thread.currentThread().getName());
}

@Override
public SupervisorStrategy supervisorStrategy() {
    System.out.println("**** SupervisorStrategy Override Successfully ****");
    return new OneForOneStrategy(5, Duration.create(1, TimeUnit.MINUTES),
            DeciderBuilder.match(ResumeException.class, e -> SupervisorStrategy.resume())
            .match(RestartException.class, e -> SupervisorStrategy.restart())
            .match(StopException.class, e -> SupervisorStrategy.stop())
            .match(EsclateException.class, e -> SupervisorStrategy.escalate())
            .matchAny(e -> SupervisorStrategy.escalate()).build());

}}

在 receive() 方法中，当我抛出 EsclateException 时，日志会继续，不会终止 actor。但是，当我用 throw new Error() 替换异常代码时，参与者会停止工作并终止。从输出来看，我的 SupervisorStrategy 未注册，并且 Actor 在默认的 SupervisorStrategy 上运行。我如何注册我的策略？

下面是我的调用代码:

public class JavaActorTest {

public static ActorSystem system;

@BeforeClass
public static void start() {
    system = ActorSystem.create("ActorLifeCycleTest");
}

@AfterClass
public static void cleanup() {
    JavaTestKit.shutdownActorSystem(system);
    system = null;
}

@Test
public void testActorCreation(){
    TestActorRef<JavaActor> actorRef = TestActorRef.create(system, Props.create(JavaActor.class));
    actorRef.tell("Ping", ActorRef.noSender());
    assertThat(true, is(true));
}}

Answer 1

一个 Actor 是由其父 Actor 而非其自身进行监督，因此当 Actor 失败时，将应用其父 Actor 的 supervisorStrategy。

在您的示例中，您不包括您自己的 parent ，因此应用了用户监护人 Actor 监督。

您可以在此处的文档中阅读有关监督的更多信息:http://doc.akka.io/docs/akka/2.4/general/supervision.html#supervision