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FluxMessageChannel: propagate the current context from producer to consumer #8889

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artembilan opened this issue Feb 7, 2024 · 0 comments
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FluxMessageChannel: propagate the current context from producer to consumer #8889

artembilan opened this issue Feb 7, 2024 · 0 comments
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(EOL) for: backport-to-6.2.x in: core status: backported type: enhancement
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6.3.0-M1

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@artembilan
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There is no connection between producer (FluxMessageChannel.send()) and consumer FluxMessageChannel.subscribe(Subscriber) to propagate the context (typically thread local variables), e.g. an Observation or an Authentication.
Therefore we need to look into mechanism to transport the context via IntegrationMessageHeaderAccessor.REACTOR_CONTEXT message header.
@artembilan artembilan added this to the 6.3.0-M1 milestone Feb 7, 2024
artembilan added a commit that referenced this issue Feb 7, 2024
@artembilan
GH-8889: FluxMCh: propagate context per message
d225ddf 
Fixes: #8889

* Gather the current thread local state for the message into `IntegrationMessageHeaderAccessor.REACTOR_CONTEXT` header
before `this.sink.tryEmitNext(messageToEmit)`
* Restore thread locals for the current message in the `ReactiveStreamsConsumer.SubscriberDecorator` just before `this.delegate.onNext(messageToDeliver)`

**Cherry-pick to `6.2.x`**

(cherry picked from commit dbd46df)
@spring-builds spring-builds mentioned this issue Feb 7, 2024
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(EOL) for: backport-to-6.2.x in: core status: backported type: enhancement
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