java - springboot-rsocket如何接收多个参数？

Question

private final RSocketRequester rSocketRequester;

@RequestMapping(path = "/**")
public Publisher<ServerResponse> mockController(ServerWebExchange serverWebExchange) {
    String path = serverWebExchange.getRequest().getPath().toString();
    String method = serverWebExchange.getRequest().getMethodValue();
    return rSocketRequester.route("/mock").data(path).data(method).retrieveMono(ServerResponse.class);
}


@MessageMapping(value = "/mock")
public Mono<ServerResponse> mockService(String path, String method) {
    return Mono.just(new ServerResponse<>(0, "success", path+method));
}

如果我给Rsocket设置更多参数，Rsocket在请求Controller时会报错

java.lang.NullPointerException: null
at io.rsocket.util.ByteBufPayload.sliceData(ByteBufPayload.java:149) ~[rsocket-core-1.0.0-RC5.jar:na]
at org.springframework.messaging.rsocket.PayloadUtils.retainDataAndReleasePayload(PayloadUtils.java:54) ~[spring-messaging-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.messaging.rsocket.annotation.support.MessagingRSocket.retainDataAndReleasePayload(MessagingRSocket.java:186) ~[spring-messaging-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:107) ~[reactor-core-3.3.0.RELEASE.jar:3.3.0.RELEASE]
at reactor.core.publisher.FluxJust$WeakScalarSubscription.request(FluxJust.java:99) ~[reactor-core-3.3.0.RELEASE.jar:3.3.0.RELEASE]
at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:162) ~[reactor-core-3.3.0.RELEASE.jar:3.3.0.RELEASE]
at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.request(FluxPeekFuseable.java:137) ~[reactor-core-3.3.0.RELEASE.jar:3.3.0.RELEASE]

如何解决？这是我的 rsocket-controller 配置，可能是配置问题吗？

@Bean
RSocket rSocket() {
    return RSocketFactory
            .connect()
            .dataMimeType(MimeTypeUtils.ALL_VALUE)
            .frameDecoder(PayloadDecoder.ZERO_COPY)
            .transport(TcpClientTransport.create(7003))
            .start()
            .block();
}

@Bean
RSocketRequester rSocketRequester(RSocketStrategies rSocketStrategies) {
    return RSocketRequester.builder()
            .rsocketFactory(factory -> factory
                    .dataMimeType(MimeTypeUtils.ALL_VALUE)
                    .frameDecoder(PayloadDecoder.ZERO_COPY))
            .rsocketStrategies(rSocketStrategies)
            .connect(TcpClientTransport.create(7003))
            .retry().block();
}

Answer 1

如explained in the reference documentation for RSocket , @MessageMapping 注解的处理程序方法只能绑定(bind)传入消息中的一些内容:

• 实际的消息正文
• 标题
• 来自目标路线的一些变量
• 或请求者向客户端发送请求

在您的示例中，无法绑定(bind)字符串路径、字符串方法参数。

不支持在RSocketRequester请求中设置多个数据有效负载(我认为只会发送最后一个)。您应该创建一个对象并将其作为有效负载发送。

设置 RSocket 时，使用 MimeTypeUtils.ALL_VALUE 作为数据 MIME 类型将不起作用。您需要使用实际的、具体的 MIME 类型，否则框架将不知道如何序列化您的数据。

一般来说，您应该避免手动创建 RSocket，而是 rely on the Spring infrastructure for that .

更新

与此同时，Spring 框架团队 improved the API to avoid calling data on the requester multiple times .