订阅可连接热源时出现CancellationException

Question

我正在使用 reactor-core 3.1.4。

考虑以下代码片段：

Flux<String> flux = Flux.<String>create(sink -> sink.next("test"))
    .replay(1)
    .refCount();

flux.subscribe(System.out::println);
flux.next().subscribe(System.out::println); // The exception is thrown here!

预期输出：

test
test

实际输出：

test
Exception in thread "main" reactor.core.Exceptions$ErrorCallbackNotImplemented: java.util.concurrent.CancellationException: Disconnected
Caused by: java.util.concurrent.CancellationException: Disconnected
    at reactor.core.publisher.FluxReplay$ReplaySubscriber.dispose(FluxReplay.java:1202)
    at reactor.core.publisher.OperatorDisposables.dispose(OperatorDisposables.java:132)
    at reactor.core.publisher.FluxRefCount$RefCountMonitor.innerCancelled(FluxRefCount.java:132)
    at reactor.core.publisher.FluxRefCount$RefCountInner.cancel(FluxRefCount.java:200)
    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:75)
    at reactor.core.publisher.FluxRefCount$RefCountInner.onNext(FluxRefCount.java:177)
    at reactor.core.publisher.FluxReplay$SizeBoundReplayBuffer.replayNormal(FluxReplay.java:808)
    at reactor.core.publisher.FluxReplay$SizeBoundReplayBuffer.replay(FluxReplay.java:892)
    at reactor.core.publisher.FluxReplay.subscribe(FluxReplay.java:1085)
    at reactor.core.publisher.FluxRefCount$RefCountMonitor.subscribe(FluxRefCount.java:116)
    at reactor.core.publisher.FluxRefCount.subscribe(FluxRefCount.java:77)
    at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40)
    at reactor.core.publisher.Mono.subscribe(Mono.java:3077)
    at reactor.core.publisher.Mono.subscribeWith(Mono.java:3185)
    at reactor.core.publisher.Mono.subscribe(Mono.java:3071)
    at reactor.core.publisher.Mono.subscribe(Mono.java:3038)
    at reactor.core.publisher.Mono.subscribe(Mono.java:2985)
    at test.Test.main(Test.java:10)

对我来说，这是 reactor-core 库中的一个错误。我的说法正确还是我遗漏（误解）了什么？

谢谢，斯特凡

Answer 1

已确认这是bug. It is fixed in reactor-core 3.1.5。

订阅可连接热源时出现CancellationException

CancellationException occurs while subscribing to connectable hot source

java

project-reactor

reactive-streams