Hi,
I am trying to implement a customized Sink, in which I need to deal with
Future, but I don't know how to do. Could you please help me?
class EventSink(...) {
val in: Inlet[EventEnvelope2] = Inlet("EventSink")
override val shape: SinkShape[EventEnvelope2] = SinkShape(in)
override def createLogic(inheritedAttributes: Attributes):
GraphStageLogic = {
new GraphStageLogic(shape) {
// This requests one element at the Sink startup.
override def preStart(): Unit = pull(in)
setHandler(in, new InHandler {
override def onPush(): Unit = {
val future = handle(grab(in))
Await.ready(future, Duration.Inf)
/*
future.onComplete {
case Success(_) =>
logger.info("pulling next events")
pull(in)
case Failure(failure) =>
logger.error(failure.getMessage, failure)
throw failure
}*/
pull(in)
}
})
}
}
private def handle(envelope: EventEnvelope2): Future[Unit] = {
val EventEnvelope2(query.Sequence(offset), _/*persistenceId*/,
_/*sequenceNr*/, event) = envelope
...
db.run(statements.transactionally)
}
}
I currently have to block the future, as with the one that I commented out,
it only received the first event and stopped. Is there a non-blocking way?
Thanks,
Cheng
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