Hi there,
I am implementing a Kafka Client and I would like to create one instance of
RunnableGraph (listener) to listen to each Partition and keep the
references to the runnables for further administration.
One of the administration tasks is to stop listening to one of the
partitions.
1. How could I possibly stop a RunnableGraph?
2. And how could I handle errors for each RunnableGraph separately in order
to implement behaviour like stop/restart listening to a certain event?
val g: RunnableGraph[_] = RunnableGraph.fromGraph(GraphDSL.create() {
implicit builder =>
val connFlow: Flow[HttpRequest, HttpResponse, Future[Http.
OutgoingConnection]] = connection.connection()
val out: Outlet[HttpResponse] = builder.add(Source.single(request).via
(connFlow)).out
val transform2ByteString: FlowShape[HttpResponse, ByteString] =
builder.add(null)
val transform2String: FlowShape[ByteString, String] = builder.add(null
)
val deserialize2Object: FlowShape[String, T] = builder.add(null)
val filterMessagesWithEvents: FlowShape[T, T] = builder.add(null)
val publishEvent2listener: Inlet[Any] = builder.add(Sink.ignore).in
// Graph
out ~> transform2ByteString ~> transform2String ~>
deserialize2Object ~> filterMessagesWithEvents ~>
publishEvent2listener
ClosedShape //
})
g.run()
Thank you in advance,
Fernando
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