I have an FSM that is exhibiting really strange behavior.
I was getting warning log lines about unhanded events, so I added a
catch-all and see strangeness.
minimally this is what it looks like
case object Committing
case class Drained(stream:String)
when(Committing) {
case Event(Drained(stream), drained) if drained + 1 < context.children.size
=>
log.info("{} drained: {}", stream, drained + 1)
stay using (drained + 1)
case Event(Drained(stream), drained) if drained + 1 ==
context.children.size =>
log.info("{} drained, finished: {}", stream, drained + 1)
connector.commitOffsets
log.info("committed")
goto(Receiving)
case Event(Drained(stream), drained) =>
log.warning("UNEXPECTED DRAINED IN COMMITTING from {} , state: {}",
stream, drained )
stay()
case Event(e, s) =>
log.warning("UNEXPECTED X IN COMMITTING from {} , state: {}", e, s)
stay()
}
The log line I get says “WARN UNEXPECTED X IN COMMITTING from Drained ,
state: 0” WTF?
How is it falling through to the catchall?
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