Hi all,
Sink<Message, NotUsed> sink = Flow.<Message>create()
.map((msg) -> new Incoming(msg.asTextMessage().getStrictText()))
* .to(Sink.actorRef(actor, PoisonPill.getInstance()));*
Can you please explain what does bolded part of the code do?
My first thought was that PoisonPill is sent when websocket disconnects.
Please correct me if I'm wrong.
Thank you in advance.
BR,
Alan
Dana utorak, 8. ožujka 2016. u 15:59:26 UTC+1, korisnik Johan Andrén
napisao je:
>
> Here is an adaptation of the Scala sample, but in Java:
>
> import akka.NotUsed;
> import akka.actor.*;
> import akka.http.javadsl.model.ws.Message;
> import akka.http.javadsl.model.ws.TextMessage;
> import akka.http.javadsl.server.HttpApp;
> import akka.http.javadsl.server.Route;
> import akka.japi.pf.ReceiveBuilder;
> import akka.stream.OverflowStrategy;
> import akka.stream.javadsl.Flow;
> import akka.stream.javadsl.Sink;
> import akka.stream.javadsl.Source;
>
> import java.util.Optional;
>
> public class WebSocketServer {
> private static final class Router extends HttpApp {
>
> private final ActorSystem system;
>
> public Router(ActorSystem system) {
> this.system = system;
> }
>
> public Route createRoute() {
> return route(
> path("test").route(
> get(handleWebSocketMessages(createWebSocketFlow()))
> )
> );
> }
>
> private Flow<Message, Message, NotUsed> createWebSocketFlow() {
> ActorRef actor = system.actorOf(Props.create(AnActor.class));
>
> Source<Message, NotUsed> source = Source.<Outgoing>actorRef(5,
> OverflowStrategy.fail())
> .map((outgoing) -> (Message) TextMessage.create(outgoing.message))
> .<NotUsed>mapMaterializedValue(destinationRef -> {
> actor.tell(new OutgoingDestination(destinationRef),
> ActorRef.noSender());
> return NotUsed.getInstance();
> });
>
> Sink<Message, NotUsed> sink = Flow.<Message>create()
> .map((msg) -> new Incoming(msg.asTextMessage().getStrictText()))
> .to(Sink.actorRef(actor, PoisonPill.getInstance()));
>
>
> return Flow.fromSinkAndSource(sink, source);
> }
>
> }
>
>
>
>
> public static void main(String[] args) {
> ActorSystem actorSystem = ActorSystem.create();
>
> Router router = new Router(actorSystem);
> router.bindRoute("127.0.0.1", 8082, actorSystem);
> }
>
> static class Incoming {
> public final String message;
> public Incoming(String message) {
> this.message = message;
> }
> }
>
> static class Outgoing {
> public final String message;
> public Outgoing(String message) {
> this.message = message;
> }
> }
>
> static class OutgoingDestination {
> public final ActorRef destination;
> OutgoingDestination(ActorRef destination) {
> this.destination = destination;
> }
> }
>
> static class AnActor extends AbstractActor {
>
> private Optional<ActorRef> outgoing = Optional.empty();
>
> public AnActor() {
> receive(ReceiveBuilder.match(
> OutgoingDestination.class, (msg) -> outgoing =
> Optional.of(msg.destination)
> ).match(
> Incoming.class, (in) -> outgoing.ifPresent((out) -> out.tell(new
> Outgoing("got it"), self()))
> ).build());
> }
> }
> }
>
>
> Hope this helps.
>
> --
> Johan Andrén
> Akka Team, Lightbend Inc.
>
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