Question

我是玩框架的新手。我想做的是一个客户端/服务器应用程序，其中

客户端将音频实时流传输到服务器（用户必须按下按钮才能通话）
服务器可以识别
服务器实时发送用户当前所说的结果。

我读了很多有关游戏框架的文章，我认为WebSocket是我所需要的。但是对我来说还不清楚，是否应该直接使用actors或akka流？

我在play chatroom example（使用演员）和戏剧stock market example（akka流）中进行了一些测试，但是里面有很多魔术，不确定是否会理解。

顺便说一句，作为附带说明，我认为聊天室示例更适合我的需求。但是我什至无法理解如何在服务器上获取数据：(当使用时，单击“发送”按钮发送字符串，我希望我的HomeController获得此字符串...我甚至都做不到...

/**
* A very simple chat client using websockets.
*/
public class HomeController extends Controller {

private final Flow<String, String, NotUsed> userFlow;
private final WebJarsUtil webJarsUtil;


@Inject
public HomeController(ActorSystem actorSystem,
                      Materializer mat,
                      WebJarsUtil webJarsUtil) {
    org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(this.getClass());
    LoggingAdapter logging = Logging.getLogger(actorSystem.eventStream(), logger.getName());

    //noinspection unchecked
    Source<String, Sink<String, NotUsed>> source = MergeHub.of(String.class)
            .log("source", logging)
            .recoverWithRetries(-1, new PFBuilder().match(Throwable.class, e -> Source.empty()).build());
    Sink<String, Source<String, NotUsed>> sink = BroadcastHub.of(String.class);

    Pair<Sink<String, NotUsed>, Source<String, NotUsed>> sinkSourcePair = source.toMat(sink, Keep.both()).run(mat);
    Sink<String, NotUsed> chatSink = sinkSourcePair.first();
    Source<String, NotUsed> chatSource = sinkSourcePair.second();
    this.userFlow = Flow.fromSinkAndSource(chatSink, chatSource).log("userFlow", logging);

    this.webJarsUtil = webJarsUtil;
}

public Result index() {
    Http.Request request = request();
    String url = routes.HomeController.chat().webSocketURL(request);
    return Results.ok(views.html.index.render(url, webJarsUtil));
}

public WebSocket chat() {
    return WebSocket.Text.acceptOrResult(request -> {
        if (sameOriginCheck(request)) {
            return CompletableFuture.completedFuture(F.Either.Right(userFlow));
        } else {
            return CompletableFuture.completedFuture(F.Either.Left(forbidden()));
        }
    });
}

/**
 * Checks that the WebSocket comes from the same origin.  This is necessary to protect
 * against Cross-Site WebSocket Hijacking as WebSocket does not implement Same Origin Policy.
 *
 * See https://tools.ietf.org/html/rfc6455#section-1.3 and
 * http://blog.dewhurstsecurity.com/2013/08/30/security-testing-html5-websockets.html
 */
private boolean sameOriginCheck(Http.RequestHeader request) {
    String[] origins = request.headers().get("Origin");
    if (origins.length > 1) {
        // more than one origin found
        return false;
    }
    String origin = origins[0];
    return originMatches(origin);
}

private boolean originMatches(String origin) {
    if (origin == null) return false;
    try {
        URI url = new URI(origin);
        return url.getHost().equals("localhost")
                && (url.getPort() == 9000 || url.getPort() == 19001);
    } catch (Exception e ) {
        return false;
    }
}

}

直接使用演员vs Akka流的WebSockets，我应该使用哪一个？

0 个答案: