As per
http://doc.akka.io/docs/akka/2.4.16/java/stream/stream-customize.html#Port_states__AbstractInHandler_and_AbstractOutHandler
you can only push to a port if downstream has pulled (ie signalled that it
is ready for data). So, in addition to checking isClosed(outx), you also
need to check isAvailable(outx).
Alternatively, you can use emit(outx)which takes care of this automatically.
Julian
On Monday, January 9, 2017 at 12:46:43 PM UTC, Sergey Sopin wrote:
>
> Hi,
>
> I have created FanOutShape2 shape with cusom logic:
>
> @Override
> public GraphStageLogic createLogic(Attributes inheritedAttributes) {
> return new GraphStageLogic(shape) {
> {
> setHandler(in, new AbstractInHandler() {
> @Override
> public void onPush() throws Exception {
> Object result = process(grab(in), materializer());
>
> if (result instanceof ProcessingResponse) {
> ProcessingResponse response =
> (ProcessingResponse) result;
> if (!isClosed(out1)) {
> push(out1, response);
> //This is FAndLShape.java:46
> }
> } else if (result != null && result instanceof
> FinderData) {
> FinderData response = (FinderData) result;
> if (!isClosed(out0)) {
> push(out0, response);
> }
> }
> }
> });
>
> setHandler(out0, new AbstractOutHandler() {
> @Override
> public void onPull() throws Exception {
> if ((!hasBeenPulled(in)) && (!isClosed(in))) {
> pull(in);
> }
> }
> });
>
> setHandler(out1, new AbstractOutHandler() {
> @Override
> public void onPull () throws Exception {
> if ((!hasBeenPulled(in)) && (!isClosed(in))) {
> pull(in);
> }
> }
> });
> }
>
> };
> }
>
> And sometimes I get following error message:
>
> [error] a.a.RepointableActorRef - Error in stage
> [kernel.modeller.workers.streamFinder.finderShapes.FAndLShape@4efd96f7]:
> requirement failed: Cannot push port (out1) twice
> java.lang.IllegalArgumentException: requirement failed: Cannot push port
> (out1) twice
> at scala.Predef$.require(Predef.scala:219)
> at akka.stream.stage.GraphStageLogic.push(GraphStage.scala:439)
> at
> kernel.modeller.workers.streamFinder.finderShapes.FAndLShape$1$1.onPush(FAndLShape.java:46)
> at
> akka.stream.impl.fusing.GraphInterpreter.processElement$1(GraphInterpreter.scala:582)
> at
> akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:593)
> at
> akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:535)
> at
> akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:443)
> at
> akka.stream.impl.fusing.GraphInterpreterShell.receive(ActorGraphInterpreter.scala:387)
> at
> akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:547)
> at akka.actor.Actor$class.aroundReceive(Actor.scala:484)
>
> Could you tell me what is wrong here?
> Thanks!
>
> Cheers,
> Sergey
>
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