java-tutorials/play-framework/websockets/app/controllers/HomeController.java

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package controllers;
import actors.Messenger;
import akka.actor.ActorSystem;
import akka.stream.Materializer;
import akka.stream.javadsl.Flow;
import akka.stream.javadsl.Sink;
import akka.stream.javadsl.Source;
import com.fasterxml.jackson.databind.JsonNode;
import dto.MessageDTO;
import lombok.extern.slf4j.Slf4j;
import play.libs.F;
import play.libs.streams.ActorFlow;
import play.mvc.*;
import utils.MessageConverter;
import javax.inject.Inject;
import java.time.Duration;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
@Slf4j
public class HomeController extends Controller {
private ActorSystem actorSystem;
private Materializer materializer;
@Inject
public HomeController(ActorSystem actorSystem, Materializer materializer) {
this.actorSystem = actorSystem;
this.materializer = materializer;
}
public Result index(Http.Request request) {
String url = routes.HomeController.socket().webSocketURL(request);
//To test WebSockets with akka streams, uncomment the next line and comment out the previous
//String url = routes.HomeController.akkaStreamsSocket().webSocketURL(request);
return ok(views.html.index.render(url));
}
public WebSocket socket() {
return WebSocket.Json.acceptOrResult(this::createActorFlow);
}
private CompletionStage<F.Either<Result, Flow<JsonNode, JsonNode, ?>>> createActorFlow(
Http.RequestHeader request) {
return CompletableFuture.completedFuture(F.Either.Right(createFlowForActor()));
}
private CompletionStage<F.Either<Result, Flow<JsonNode, JsonNode, ?>>>
createActorFlow2(Http.RequestHeader request) {
return CompletableFuture.completedFuture(
request.session()
.getOptional("username")
.map(username ->
F.Either.<Result, Flow<JsonNode, JsonNode, ?>>Right(
createFlowForActor()))
.orElseGet(() -> F.Either.Left(forbidden())));
}
private Flow<JsonNode, JsonNode, ?> createFlowForActor() {
return ActorFlow.actorRef(out -> Messenger.props(out), actorSystem, materializer);
}
public WebSocket akkaStreamsSocket() {
return WebSocket.Json.accept(
request -> {
Sink<JsonNode, ?> in = Sink.foreach(System.out::println);
MessageDTO messageDTO = new MessageDTO("1", "1", "Title", "Test Body");
Source<JsonNode, ?> out = Source.tick(
Duration.ofSeconds(2),
Duration.ofSeconds(2),
MessageConverter.messageToJsonNode(messageDTO)
);
return Flow.fromSinkAndSource(in, out);
});
}
}