Question

我试图保留调度程序生成的某些日期，然后以流方式通过rest终结点读取它们。我有一个非常简单的模型，一个Feed仅包含uuid和一些文本。我还有一个扩展ReactiveCouchbaseRepository<Feed, String>的存储库。

当我使用CouchbaseRepository<Feed, String>时，持久保持有效。这是我的Feed：

@Document
public class Feed {
    @Id
    private String id;
    @Field
    private String text;
    ...

和存储库：

@N1qlPrimaryIndexed
@ViewIndexed(designDoc = "feed")
public interface FeedRepository  extends ReactiveCouchbaseRepository<Feed, String> {
}

以及调度程序：

    ....
    @Autowired
    private FeedRepository feedRepository;

    @Scheduled(fixedRate = 1000)
    public void generate(){
        feedRepository.save(new Feed(UUID.randomUUID().toString(), String.valueOf(System.currentTimeMillis())));
    ...

这是我的终点：

@RestController
public class MainController {

    @Autowired
    private FeedRepository feedRepository;

    @GetMapping(value = "/get/feed/live", produces = "text/event-stream")
    public Flux<Feed> getLiveFeeds(){
        return feedRepository.findAll();
    }
}

当我呼叫端点时，我得到了：

Tue Apr 09 15:12:02 CEST 2019
There was an unexpected error (type=Internal Server Error, status=500).
View feed/all does not exist.
com.couchbase.client.java.error.ViewDoesNotExistException: View feed/all does not exist.
    at com.couchbase.client.java.view.ViewQueryResponseMapper$BuildViewResult.call(ViewQueryResponseMapper.java:211)
    at com.couchbase.client.java.view.ViewQueryResponseMapper$BuildViewResult.call(ViewQueryResponseMapper.java:185)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:69)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:77)
    at rx.internal.producers.SingleProducer.request(SingleProducer.java:65)
    at rx.Subscriber.setProducer(Subscriber.java:211)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102)
    at rx.internal.operators.OperatorSingle$ParentSubscriber.onCompleted(OperatorSingle.java:113)
    at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.checkTerminated(OperatorObserveOn.java:281)
    at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:216)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Assembly trace from producer [reactor.core.publisher.FluxDefer] :
    reactor.core.publisher.Flux.defer(Flux.java:805)
    org.springframework.data.repository.util.ReactiveWrapperConverters$RxJava1ObservableToFluxConverter.convert(ReactiveWrapperConverters.java:682)
Error has been observed by the following operator(s):
    |_  Flux.defer â‡¢ org.springframework.data.repository.util.ReactiveWrapperConverters$RxJava1ObservableToFluxConverter.convert(ReactiveWrapperConverters.java:682)
    |_  Flux.map â‡¢ org.springframework.http.codec.ServerSentEventHttpMessageWriter.encode(ServerSentEventHttpMessageWriter.java:119)
    |_  Mono.doOnError â‡¢ org.springframework.http.server.reactive.AbstractServerHttpResponse.writeAndFlushWith(AbstractServerHttpResponse.java:186)
    |_  Mono.flatMap â‡¢ org.springframework.web.reactive.DispatcherHandler.lambda$handleResult$5(DispatcherHandler.java:175)
    |_  Mono.onErrorResume â‡¢ org.springframework.web.reactive.DispatcherHandler.handleResult(DispatcherHandler.java:175)
    |_  Mono.flatMap â‡¢ org.springframework.web.reactive.DispatcherHandler.handle(DispatcherHandler.java:152)
    |_  Mono.defer â‡¢ org.springframework.web.server.handler.DefaultWebFilterChain.filter(DefaultWebFilterChain.java:119)
    |_  Mono.doAfterSuccessOrError â‡¢ org.springframework.boot.actuate.web.trace.reactive.HttpTraceWebFilter.filter(HttpTraceWebFilter.java:99)
    |_  Mono.flatMap â‡¢ org.springframework.boot.actuate.web.trace.reactive.HttpTraceWebFilter.filter(HttpTraceWebFilter.java:82)
    |_  Mono.defer â‡¢ org.springframework.web.server.handler.DefaultWebFilterChain.filter(DefaultWebFilterChain.java:119)
    |_  Mono.defer â‡¢ org.springframework.web.server.handler.DefaultWebFilterChain.filter(DefaultWebFilterChain.java:119)
    |_  Mono.doOnSuccess â‡¢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter.filter(MetricsWebFilter.java:84)
    |_  Mono.doOnError â‡¢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter.filter(MetricsWebFilter.java:84)
    |_  Mono.compose â‡¢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter.filter(MetricsWebFilter.java:76)
    |_  Mono.defer â‡¢ org.springframework.web.server.handler.DefaultWebFilterChain.filter(DefaultWebFilterChain.java:119)

Caused by: rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting onNext value: com.couchbase.client.java.document.json.JsonObject.class
    at rx.exceptions.OnErrorThrowable.addValueAsLastCause(OnErrorThrowable.java:118)
    at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:73)
    ... 16 more

为什么使用反应性存储库时日期不固定
为什么我不能使用常规的ouchbase存储库至少获取已经持久保存的数据？

谢谢您的帮助。

编辑1：为了坚持下去，有三件事是错误的/缺失的：

@EnableReactiveCouchbaseRepositories丢失（在答案之一中指出）
配置未扩展AbstractReactiveCouchbaseConfiguration，而是常规扩展
3.呼叫feedRepository.save(new Feed(UUID.randomUUID().toString(), String.valueOf(System.currentTimeMillis())))在最后遗失.subscribe()。

现在，持久部分起作用了。提取仍有问题。

编辑2

刚刚在调用端点时在日志中找到此调试消息：
2019-04-10 16:27:06.467 DEBUG 11172 --- [-computations-3] c.c.client.java.view.ViewRetryHandler : Design document not found, error is {"errors":[{"error":"not_found","reason":"Design document _design/feed not found"}

Answer 1

您好像忘记了使用@EnableReactiveCouchbaseRepositories批注启用反应性存储库：

@SpringBootApplication
@EnableScheduling
@EnableReactiveCouchbaseRepositories
public class ReactiveDemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(ReactiveDemoApplication.class, args);
    }
}

您可以在此处了解更多信息：

https://docs.spring.io/spring-data/couchbase/docs/current/reference/html/#couchbase.reactiverepository.usage

Answer 2

看起来您的FeedRepository界面缺少用于执行搜索的视图的名称。

请尝试使用以下视图名称：

@N1qlPrimaryIndexed
@ViewIndexed(designDoc = "feed", viewName = "all")
public interface FeedRepository  extends ReactiveCouchbaseRepository<Feed, String> {
}

对我来说，添加视图名称后它就可以工作。

Answer 3

有点晚了，但希望这可以对其他人有所帮助。在反应式编程中，您需要订阅发布者，否则，信息流将不会开始。在您的示例中，feedRepository.save(***)从未执行，因为您需要类似feedRepository.save(**).subscribe()的东西。

对于第二个问题，当您请求所有商品时，需要指定诸如{item}/all之类的视图，对于较新的Couchbase版本，您可以指定PrimaryKey作为获取所有商品的必需索引。

无法使用反应性方法将文档保存到沙发床

3 个答案: