Sorry, my onTimer() doesn't fire. It looks like all I need to do is 1. use
TimerGraphStageLogic 2. call scheduleOnce 3. override onTimer. I am
misusing Resume for retries but I've tried scheduleOnce in other places and
it still doesn't fire. Here's an example,
override def createLogic(inheritedAttributes: Attributes):
GraphStageLogic = {
new TimerGraphStageLogic(shape) {
private def decider = inheritedAttributes.get[SupervisionStrategy].map
(_.decider).
getOrElse(Supervision.stoppingDecider)
var retries = 1
var duration = 100
def myHandler(): Unit = {
try {
if(testException != null) throw testException
if(iter.hasNext) {
push(out, iter.next())
}
} catch {
case NonFatal(e) => decider(e) match {
case Supervision.Stop => {
failStage(e)
}
case Supervision.Resume => {
if(retries > 0) {
logger.debug("before scheduleOnce retries {} duration {}",
retries, duration)
scheduleOnce(None, FiniteDuration(duration, MILLISECONDS))
} else {
failStage(e) // too many retries
}
}
}
}
}
setHandler(out, new OutHandler {
override def onPull(): Unit = {
myHandler()
}
})
override protected def onTimer(timerKey: Any): Unit = {
retries -= 1
duration *= 2
myHandler()
}
}
}
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