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设置了更多的参数，当我请求控制器时，Rsocket会报告一个错误

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]

如何重塑它？这是我的rsocket-controller配置，会不会是配置问题？

@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

作为explained in the reference documentation for RSocket，带@MessageMapping注释的处理程序方法只能绑定传入消息中的几个内容：

将实际的消息body

• headers

• some变量从目标路由
• 或请求程序发送到client

在您的示例中，不能绑定String path, String method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)。相反，您应该创建单个对象并将其作为有效负载发送。

在设置RSocket时，使用数据MIME类型的MimeTypeUtils.ALL_VALUE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数据。

通常，您应该避免手动创建RSocket，而应使用rely on the Spring infrastructure for that。

更新

同时，Spring Framework团队的improved the API to avoid calling data on the requester multiple times。