org.eclipse.microprofile.reactive.messaging.Incoming Java Examples

@Incoming("publisher-for-processor-publisher-payload")
@Outgoing("processor-publisher-payload")
public Publisher<String> processorOfPayloads(int value) {
    return ReactiveStreams.of(value)
        .map(i -> i + 1)
        .flatMap(i -> ReactiveStreams.of(i, i))
        .map(i -> Integer.toString(i))
        .buildRs();
}
 

@Incoming("in")
@Outgoing("out-2")
public Multi<Message<String>> processMessage(Message<String> m) {
    String s = m.getPayload();
    if (s.equalsIgnoreCase("skip")) {
        return Multi.createFrom().empty();
    }
    return Multi.createFrom().item(m.withPayload(s.toUpperCase()));
}
 

@Incoming("A")
@Outgoing("AA")
public Publisher<Message<String>> process(Publisher<Message<Integer>> publisher) {
    return ReactiveStreams.fromPublisher(publisher)
            .flatMapCompletionStage(m -> CompletableFuture
                    .supplyAsync(() -> Message.of(Integer.toString(m.getPayload())), executor))
            .buildRs();
}
 

@Incoming("count")
@Outgoing("sink")
public Publisher<String> process(Multi<Integer> source) {
    return source
            .map(i -> i + 1)
            .flatMap(i -> Flowable.just(i, i))
            .map(i -> Integer.toString(i));
}
 

@Blocking
@Incoming("count")
@Outgoing("sink")
public CompletionStage<Message<String>> process(Message<Integer> value) {
    return CompletableFuture.supplyAsync(() -> Integer.toString(value.getPayload() + 1))
            .thenApply(Message::of);
}
 

@Incoming("hello")
@Outgoing("out")
public Flowable<String> consume(Flowable<String> values) {
    Scheduler scheduler = Schedulers.from(executor);
    return values
            .observeOn(scheduler)
            .delay(1, TimeUnit.MILLISECONDS, scheduler)
            .doOnError(err -> {
                downstreamFailure = err;
            });
}
 

@Incoming(MANUAL_ACKNOWLEDGMENT_BUILDER)
@Acknowledgment(Acknowledgment.Strategy.MANUAL)
@Outgoing("sink-" + MANUAL_ACKNOWLEDGMENT_BUILDER)
public PublisherBuilder<Message<String>> processorWithAckWithBuilder(Message<String> message) {
    return ReactiveStreams.of(message)
            .flatMapCompletionStage(m -> m.ack().thenApply(x -> m))
            .flatMap(m -> ReactiveStreams.of(Message.of(m.getPayload()), Message.of(m.getPayload())))
            .peek(m -> processed(MANUAL_ACKNOWLEDGMENT_BUILDER, m));
}
 

@Incoming("my-dummy-stream")
@Outgoing("toUpperCase")
public Multi<Message<String>> toUppercase(Multi<Message<String>> input) {
    return input
            .map(Message::getPayload)
            .map(String::toUpperCase)
            .map(Message::of);
}
 

@Incoming("in")
@Outgoing("out")
public Publisher<String> transformPayload(Multi<String> stream) {
    return stream
        // The incoming messages are already acknowledged
        .map(String::toUpperCase);
}
 

@Incoming("in")
@Outgoing("out-1")
public Multi<String> processPayload(String s) {
    if (s.equalsIgnoreCase("skip")) {
        return Multi.createFrom().empty();
    }
    return Multi.createFrom().item(s.toUpperCase());
}
 

@Incoming("a")
@Incoming("b")
@Incoming("c")
@Outgoing("out")
public Message<String> process(Message<String> s) {
    return Message.of(s.getPayload().toUpperCase());
}
 

@Blocking
@Incoming("count")
public Uni<Void> consume(Message<String> message) {
    return Uni.createFrom().item(() -> {
        list.add(message.getPayload());
        return null;
    });
}
 

@Incoming("prices")
@Outgoing("my-data-stream")
@Broadcast
public double process(byte[] priceRaw) {
    int priceInUsd = Integer.parseInt(new String(priceRaw));
    System.out.println("Receiving price: " + priceInUsd);
    return priceInUsd * CONVERSION_RATE;
}
 

@Blocking
@Incoming("count")
@Outgoing("sink")
public ProcessorBuilder<Message<Integer>, Message<String>> process() {
    return ReactiveStreams.<Message<Integer>> builder()
            .map(Message::getPayload)
            .map(i -> i + 1)
            .flatMapRsPublisher(i -> Flowable.just(i, i))
            .map(i -> Integer.toString(i))
            .map(Message::of);
}
 

@Incoming("sink")
public Subscriber<Message<String>> sink() {
    CompletionSubscriber<Message<String>, List<Message<String>>> subscriber = ReactiveStreams.<Message<String>> builder()
            .toList().build();
    subscriber.getCompletion().thenAccept(result::addAll);
    return subscriber;
}
 

@Incoming("prices")
public CompletionStage<Void> consume(Message<Double> price) {
    // process your price.

    // Acknowledge the incoming message, marking the AMQP message as `accepted`.
    return price.ack();
}
 

@Incoming(NO_ACKNOWLEDGMENT_PAYLOAD)
@Acknowledgment(Acknowledgment.Strategy.NONE)
public Subscriber<String> subWithNoAckWithPayload() {
    return ReactiveStreams.<String> builder()
            .forEach(m -> {
                processed(NO_ACKNOWLEDGMENT_PAYLOAD, m);
                microNap();
            })
            .build();
}
 

@Incoming("publisher-for-processor-builder-message")
@Outgoing("processor-builder-message")
public ProcessorBuilder<Message<Integer>, Message<String>> processorBuilderOfMessages() {
  increment("publisher-for-processor-builder-message");
  return ReactiveStreams.<Message<Integer>>builder()
    .map(Message::getPayload)
    .map(i -> i + 1)
    .flatMap(i -> ReactiveStreams.of(i, i))
    .map(i -> Integer.toString(i))
    .map(Message::of);
}
 

@Incoming(POST_ACKNOWLEDGMENT)
@Acknowledgment(Acknowledgment.Strategy.POST_PROCESSING)
@Outgoing("sink-" + POST_ACKNOWLEDGMENT)
public String processorWithPostAck(String input) {
    processed(POST_ACKNOWLEDGMENT, input);
    return input + "1";
}
 

@Incoming(PRE_ACKNOWLEDGMENT)
@Acknowledgment(Acknowledgment.Strategy.PRE_PROCESSING)
@Outgoing("sink")
public Message<String> processorWithPreAck(Message<String> input) {
    processed(PRE_ACKNOWLEDGMENT, input);
    return Message.of(input.getPayload() + "1");
}
 

@SuppressWarnings({ "rawtypes" })
@Incoming("prices")
public CompletionStage<Void> consume(Message<Double> price) {
    // process your price.
    list.add(price.getPayload());
    Optional<IncomingKafkaRecordMetadata> metadata = price.getMetadata(IncomingKafkaRecordMetadata.class);
    metadata.orElseThrow(() -> new IllegalArgumentException("Metadata are missing"));
    // Acknowledge the incoming message (commit the offset)
    return price.ack();
}
 

@Blocking
@Incoming("count")
@Outgoing("sink")
public PublisherBuilder<Message<String>> process(Message<Integer> message) {
    return ReactiveStreams.of(message)
            .map(Message::getPayload)
            .map(i -> i + 1)
            .flatMapRsPublisher(i -> Flowable.just(i, i))
            .map(i -> Integer.toString(i))
            .map(Message::of);
}
 

@Incoming(DEFAULT_ACKNOWLEDGMENT_UNI)
@Outgoing("sink")
public Uni<Message<String>> processorWithDefaultAckUni(Message<String> input) {
    return Uni.createFrom().item(() -> {
        processed(DEFAULT_ACKNOWLEDGMENT_UNI, input);
        return input.withPayload(input.getPayload() + "1");
    });
}
 

@Incoming("C")
@Outgoing("CC")
public PublisherBuilder<Message<String>> process(PublisherBuilder<Message<Integer>> publisher) {
    return publisher
            .flatMapCompletionStage(m -> CompletableFuture
                    .supplyAsync(() -> Message.of(Integer.toString(m.getPayload())), executor));
}
 

@Incoming("count")
@Outgoing("sink")
public Publisher<Message<String>> process(Flux<Message<Integer>> source) {
    return source
            .map(Message::getPayload)
            .map(i -> i + 1)
            .flatMap(i -> Flowable.just(i, i))
            .map(i -> Integer.toString(i))
            .map(Message::of);
}
 

@Incoming("in")
@Outgoing("out")
public Message<String> processMessage(Message<String> m) {
    String s = m.getPayload();
    if (s.equalsIgnoreCase("skip")) {
        return null;
    }
    return m.withPayload(s.toUpperCase());
}
 

@Incoming(CHANNEL_APP_B)
public void receive(String input) {
    inAppMessagesReceived.incrementAndGet();
}
 

@Incoming("sink")
public void consume(String s) {
    list.add(s);
}
 

@Incoming("processor-publisher-builder-payload")
public void getMessgesFromProcessorBuilderOfPayloads(String value) {
    add("processor-builder-payload", value);
}
 

@Incoming("in2")
@Outgoing("out")
public int multiply(int i) {
    return i * 2;
}