Hi
I'm trying to use a Valve (which is implemented via a GraphStage). The idea
is to close the valve when some Left is raised inside a stream. That seems
working ok.
One of the thing is that I'm stuck in the onPush handler, cause before
doing a push to the Outlet port, I have to validate if the valve is open,
but to do so, I have to access the DB and look for the actual state of the
valve. Something like this:
override def onPush(): Unit = {
state.map(
s =>
if (s == SwitchMode.Open) {
push(*out, grab(in)*)
}
)
}
Reading some logs, it seems to be working, but it's not. I have a test that
tries to get the message and is getting a timeout.
val probe = stream(group, topic) // this stream has a viaMat where the
graphstage is inserted
.runWith(TestSink.probe)
probe.requestNext() // here is the timeout
Is it possible to pause the consumer having this restriction or should I
try to do it in another way?
If this is the way to go, I'm concerned about what will happen when the
Valve gets open again. If the stream has a lot of messages, will the stream
capable of manage this or should I control that some way?
Regards
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