Akka Java用路径创建testprobe ref?

时间:2015-01-26 14:15:32

标签: java testing akka

我对使用akka进行测试还有点新意。在一个系统中,我正在做一些像

这样的事情
private void tellPublisherAboutUpdates(Map<String,Update> updates){ 
        if(updates.isEmpty()){
            getContext().actorSelection(ActorSelectionPath.UPDATE_PUBLISHER.path()).tell(new InfoMessage<Map<String,Update>>(updates), getSelf());
        }
    }

现在,我首先想到的是,使用TestProbe创建一个带有相关路径的测试参考,但我不知道该怎么做?如果有一种更适合测试这种交互的替代方法,我也很想了解它。

1 个答案:

答案 0 :(得分:2)

我用来解决这个问题的模式涉及创建如下的转发:

**
 * Simple actor that takes another actor and forwards all messages to it.
 * Useful in unit testing for capturing and testing if a message was received.
 * Simply pass in an Akka JavaTestKit probe into the constructor, and all messages
 * that are sent to this actor are forwarded to the JavaTestKit probe
 * Ref: https://gist.github.com/jconwell/8153535
 */
public class ForwardingActor extends UntypedActor {
    final ActorRef target;
    public ForwardingActor(ActorRef target) {
        this.target = target;
    }
    @Override
    public void onReceive(Object msg) {
        target.forward(msg, getContext());
    }
}

然后您可以像这样使用它来注入探针参考:

JavaTestKit probe = new JavaTestKit(actorSystem);
actorSystem.actorOf(Props.create(ForwardingActor.class, probe.getRef()), "myActor");

当你希望你的actor成为当前actor或顶级actor的孩子时,这可以正常工作,但如果你的actor路径引用嵌套在层次结构中的actor,它可能有点棘手。我将ForwardingActor与ChildCreationActor(https://gist.github.com/jconwell/8154233)结合使用来解决这个问题。

我通过此博客了解了上述techqiue:http://geekswithblogs.net/johnsPerfBlog/archive/2014/01/02/akka-test-patterns-for-java.aspx