Figured it out. In my custom Bidi, I needed to override the default
onUpstreamFinish() and onDownStreamFinish() methods on the in/out handlers,
since by default they complete the entire stage (i.e. the whole Bidi).
This meant that the completion of the requestIn port (invoked after the
single message from the source was received), the stage was completed
before the message could flow through the response flow. The fixed code is
pasted below:
override def createLogic(inheritedAttributes: Attributes): GraphStageLogic =
new GraphStageLogic(shape) {
setHandler(requestIn, new InHandler {
override def onPush(): Unit = {
push(requestOut, grab(requestIn))
}
override def onUpstreamFinish() = complete(requestOut)
})
setHandler(requestOut, new OutHandler {
override def onPull(): Unit = {
pull(requestIn)
}
override def onDownstreamFinish() = cancel(requestIn)
})
setHandler(responseIn, new InHandler {
override def onPush(): Unit = {
val msg = grab(responseIn)
push(responseOut, msg)
}
override def onUpstreamFinish() = completeStage()
})
setHandler(responseOut, new OutHandler {
override def onPull(): Unit = {
pull(responseIn)
}
override def onDownstreamFinish() = cancel(responseIn)
})
}
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