Hello,
I'm working on a client-side application atop tcp streams, and I'm
curious what is the recommended approach for handling reconnects. I'm
thinking to wrap the underlying transport flow in an AsyncStage, and then
rematerialize the transport on completion. It would look something like
this:
class ReconnectionStage[In, Out](transport: Flow[In, Out, Any],
maxInFlight: Int) extends AsyncStage[In, Out, Any] {
private var inFlight = 0
private val buffer = FixedSizeBuffer[Out](maxInFlight)
private var fm: FlowMaterializer = _
private var callback: AsyncCallback[Any] = _
private var runnableFlow: RunnableFlow[(ActorRef, Future[Unit])] = _
private var input: ActorRef = _
private def connect() {
val (ref, future) = runnableFlow.run()(fm)
input = ref
future.onComplete( _ => callback.invoke(Reconnect))(fm.executionContext)
}
override def preStart(ctx: AsyncContext[Out, Any]) {
fm = ctx.materializer
callback = ctx.getAsyncCallback()
runnableFlow = Source.actorRef(maxInFlight, OverflowStrategy.fail)
.via(transport).toMat(Sink.foreach(callback.invoke))(Keep.both)
}
...
}
It's a bit involved, and I haven't yet finished -- so I guess I'm just here
to check if I'm even on the right track :)
Cheers,
Peter
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