如何在Play控制器中注入带有构造函数参数的Actor ?

Question

我正在尝试遵循官方文档中的JavaWebSocket教程。

有这个演员:

import akka.actor.*;
public class MyWebSocketActor extends UntypedActor {
    public static Props props(ActorRef out) {
        return Props.create(MyWebSocketActor.class, out);
    }
    private final ActorRef out;
    public MyWebSocketActor(ActorRef out) {
        this.out = out;
    }
    public void onReceive(Object message) throws Exception {
        if (message instanceof String) {
            out.tell("I received your message: " + message, self());
        }
    }
}

这是websocket:

public static LegacyWebSocket<String> socket() {
    return WebSocket.withActor(MyWebSocketActor::props);
}

这是我的控制器

@Singleton
public class MessagesController extends BaseController implements CurrentUser {
    private UserProvider userProvider;
    private ActorSystem actorSystem;
    private Materializer materializer;
    private Configuration configuration;
    ActorRef websocketactor;

    @Inject
    public MessagesController(final UserProvider userProvider,
                              ActorSystem actorSystem,
                              Materializer materializer,
                              Configuration configuration
    ) {
        this.userProvider = userProvider;
        this.actorSystem = actorSystem;
        this.materializer = materializer;
        this.configuration = configuration;
        this.websocketactor = actorSystem.actorOf(); // What goes in here ? 
    }

在init过程之后，我想从控制器方法向actor发送消息。

 this.websocketactor = actorSystem.actorOf(MyWebSocketActor.props()); // this line is giving me errors because I don't know what goes in there. 

它可能是ActorRef out，这是我的websocket，但我怎么指定呢?

Answer 1

我刚刚在另一篇文章中回答了同样的问题，但以防万一，这里是:

你可以使用lambda，这里有一个简单的例子:

  public LegacyWebSocket<String> socket(String token) {
        return WebSocket.withActor(actorRef -> WSActor.props(actorRef,token));
  }