Camel reactive streams not completing when subscribed more than once - apache-camel

Question

#Component
class TestRoute(
context: CamelContext,
) : EndpointRouteBuilder() {
val streamName: String = "news-ticker-stream"
val logger = LoggerFactory.getLogger(TestRoute::class.java)
val camel: CamelReactiveStreamsService = CamelReactiveStreams.get(context)
var count = 0L
val subscriber: Subscriber<String> =
camel.streamSubscriber(streamName, String::class.java)
override fun configure() {
from("timer://foo?fixedRate=true&period=30000")
.process {
count++
logger.info("Start emitting data for the $count time")
Flux.fromIterable(
listOf(
"APPLE", "MANGO", "PINEAPPLE"
)
)
.doOnComplete {
logger.info("All the data are emitted from the flux for the $count time")
}
.subscribe(
subscriber
)
}
from(reactiveStreams(streamName))
.to("file:outbox")
}
}
2022-07-07 13:01:44.626 INFO 50988 --- [1 - timer://foo] c.e.reactivecameltutorial.TestRoute : Start emitting data for the 1 time
2022-07-07 13:01:44.640 INFO 50988 --- [1 - timer://foo] c.e.reactivecameltutorial.TestRoute : All the data are emitted from the flux for the 1 time
2022-07-07 13:01:44.646 INFO 50988 --- [1 - timer://foo] a.c.c.r.s.ReactiveStreamsCamelSubscriber : Reactive stream 'news-ticker-stream' completed
2022-07-07 13:02:14.616 INFO 50988 --- [1 - timer://foo] c.e.reactivecameltutorial.TestRoute : Start emitting data for the 2 time
2022-07-07 13:02:44.610 INFO 50988 --- [1 - timer://foo] c.e.reactivecameltutorial.TestRoute : Start emitting data for the 3 time
2022-07-07 13:02:44.611 WARN 50988 --- [1 - timer://foo] a.c.c.r.s.ReactiveStreamsCamelSubscriber : There is another active subscription: cancelled
The reactive stream are not getting completed when running for more than 1 times. So, as you can see in the logs the log message which I have added doOnComplete is only coming for the first time when timer route was triggered. When the timer route is triggered for the second time then there is no completion message. I tried to put the break point in the ReactiveStreamsCamelSubscriber, and found that for the 1st time the flow is going into the onNext() and onComplete() methods but the flow is not going into these method when the timer ran for 2nd time. I am not able to understand why this scenario is playing out?