Fix race condition in SpliceFlatStreamToMetaSingle #1845
Merged
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Motivation:
SpliceFlatStreamToMetaSingle has a race condition which may result in
concurrency invocation of a Subscriber which is prohibited by the
Reactive Streams specification [1].
[1] https://github.com/reactive-streams/reactive-streams-jvm/blob/v1.0.3/README.md#1.3
Modifications:
Subscriber reference is made visible to other threads which may
invoke terminal methods on the Subscriber.
Result:
SpliceFlatStreamToMetaSingle is more compliant with RS spec and provides
more predictable behavior.