mp.messaging.incoming.prices.serviceUrl=pulsar://pulsar:6650 (1)
mp.messaging.incoming.prices.subscriptionInitialPosition=Earliest (2)

import org.eclipse.microprofile.reactive.messaging.Incoming;

import jakarta.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class PriceConsumer {

    @Incoming("prices")
    public void consume(double price) {
        // process your price.
    }

}

@Incoming("prices")
public CompletionStage<Void> consume(Message<Double> msg) {
    // access record metadata
    var metadata = msg.getMetadata(PulsarIncomingMessageMetadata.class).orElseThrow();
    // process the message payload.
    double price = msg.getPayload();
    // Acknowledge the incoming message (acknowledge the Pulsar message back to the broker)
    return msg.ack();
}

@Incoming("prices")
public void consume(org.apache.pulsar.client.api.Message<Double> msg) {
    String key = msg.getKey();
    String value = msg.getValue();
    String topic = msg.topicName();
    // ...
}

import io.smallrye.mutiny.Multi;
import org.eclipse.microprofile.reactive.messaging.Channel;

import jakarta.inject.Inject;
import jakarta.ws.rs.GET;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import org.jboss.resteasy.reactive.RestStreamElementType;

@Path("/prices")
public class PriceResource {

    @Inject
    @Channel("prices")
    Multi<Double> prices;

    @GET
    @Path("/prices")
    @RestStreamElementType(MediaType.TEXT_PLAIN)
    public Multi<Double> stream() {
        return prices;
    }
}

@Inject @Channel("prices") Multi<Double> streamOfPayloads;

@Inject @Channel("prices") Multi<Message<Double>> streamOfMessages;

@Inject @Channel("prices") Publisher<Double> publisherOfPayloads;

@Inject @Channel("prices") Publisher<Message<Double>> publisherOfMessages;

import io.smallrye.reactive.messaging.annotations.Blocking;
import org.eclipse.microprofile.reactive.messaging.Incoming;

import jakarta.enterprise.context.ApplicationScoped;
import jakarta.transaction.Transactional;

@ApplicationScoped
public class PriceStorage {

    @Incoming("prices")
    @Transactional
    public void store(int priceInUsd) {
        Price price = new Price();
        price.value = priceInUsd;
        price.persist();
    }

}

@Incoming("prices")
public CompletionStage<Void> consumeMessage(Message<org.apache.pulsar.client.api.Messages<Double>> messages) {
    for (org.apache.pulsar.client.api.Message<Double> msg : messages.getPayload()) {
        String key = msg.getKey();
        String topic = msg.getTopicName();
        long timestamp = msg.getEventTime();
        //... process messages
    }
    // ack will commit the latest offsets (per partition) of the batch.
    return messages.ack();
}

@Incoming("prices")
public void consumeRecords(org.apache.pulsar.client.api.Messages<Double> messages) {
    for (org.apache.pulsar.client.api.Message<Double> msg : messages) {
        //... process messages
    }
}

@Incoming("prices")
public void consume(List<Double> prices) {
    for (double price : prices) {
        // process price
    }
}

mp.messaging.outgoing.prices.serviceUrl=pulsar://pulsar:6650 (1)

import io.smallrye.mutiny.Multi;
import org.eclipse.microprofile.reactive.messaging.Outgoing;

import jakarta.enterprise.context.ApplicationScoped;
import java.time.Duration;
import java.util.Random;

@ApplicationScoped
public class PulsarPriceProducer {

    private final Random random = new Random();

    @Outgoing("prices-out")
    public Multi<Double> generate() {
        // Build an infinite stream of random prices
        // It emits a price every second
        return Multi.createFrom().ticks().every(Duration.ofSeconds(1))
            .map(x -> random.nextDouble());
    }

}

@Outgoing("out")
public Multi<OutgoingMessage<Double>> generate() {
    return Multi.createFrom().ticks().every(Duration.ofSeconds(1))
        .map(x -> OutgoingMessage.of("my-key", random.nextDouble()));
}

@Outgoing("generated-price")
public Multi<Message<Double>> generate() {
    return Multi.createFrom().ticks().every(Duration.ofSeconds(1))
            .map(x -> Message.of(random.nextDouble())
                    .addMetadata(PulsarOutgoingMessageMetadata.builder()
                            .withKey("my-key")
                            .withProperties(Map.of("property-key", "value"))
                            .build()));
}

@Outgoing("prices-out") T generate(); // T excluding void

@Outgoing("prices-out") Message<T> generate();

@Outgoing("prices-out") Uni<T> generate();

@Outgoing("prices-out") Uni<Message<T>> generate();

@Outgoing("prices-out") CompletionStage<T> generate();

@Outgoing("prices-out") CompletionStage<Message<T>> generate();

package pulsar.outbound;

import jakarta.enterprise.context.ApplicationScoped;
import jakarta.enterprise.inject.Produces;

import org.apache.pulsar.client.api.Schema;
import org.apache.pulsar.common.schema.KeyValue;
import org.eclipse.microprofile.reactive.messaging.Incoming;
import org.eclipse.microprofile.reactive.messaging.Outgoing;

import io.smallrye.common.annotation.Identifier;

@ApplicationScoped
public class PulsarKeyValueExample {

    @Identifier("out")
    @Produces
    Schema<KeyValue<String, Long>> schema = Schema.KeyValue(Schema.STRING, Schema.INT64);

    @Incoming("in")
    @Outgoing("out")
    public KeyValue<String, Long> process(long in) {
        return new KeyValue<>("my-key", in);
    }

}

mp.messaging.outgoing.tx-out-example.enableTransaction=true
# ...
mp.messaging.incoming.in-channel.enableTransaction=true
mp.messaging.incoming.in-channel.batchReceive=true

package pulsar.outbound;

import jakarta.enterprise.context.ApplicationScoped;
import jakarta.inject.Inject;

import org.apache.pulsar.client.api.Messages;
import org.eclipse.microprofile.reactive.messaging.Channel;
import org.eclipse.microprofile.reactive.messaging.Incoming;
import org.eclipse.microprofile.reactive.messaging.Message;

import io.smallrye.mutiny.Uni;
import io.smallrye.reactive.messaging.pulsar.transactions.PulsarTransactions;

    @ApplicationScoped
    public class PulsarExactlyOnceProcessor {

        @Inject
        @Channel("tx-out-example")
        PulsarTransactions<Integer> txProducer;

        @Incoming("in-channel")
        public Uni<Void> emitInTransaction(Message<Messages<Integer>> batch) {
            return txProducer.withTransactionAndAck(batch, emitter -> {
                for (org.apache.pulsar.client.api.Message<Integer> record : batch.getPayload()) {
                    emitter.send(PulsarMessage.of(record.getValue() + 1, record.getKey()));
                }
                return Uni.createFrom().voidItem();
            });
        }

    }

@Outgoing("generated-price")
public Multi<Integer> generate() {
    ...
}

@Incoming("my-pulsar-consumer")
public void consume(org.apache.pulsar.api.client.Message<byte[]> record) {
    ...
}

@Inject
@Channel("price-create")
Emitter<Double> priceEmitter;

pulsar.client.serviceUrl=pulsar://pulsar:6650
pulsar.client.authPluginClassName=org.apache.pulsar.client.impl.auth.AuthenticationBasic
pulsar.client.authParams={"userId":"superuser","password":"admin"}

import java.util.Map;

import jakarta.enterprise.inject.Produces;
import io.smallrye.common.annotation.Identifier;
import org.apache.pulsar.client.impl.conf.ClientConfigurationData;
import org.apache.pulsar.client.impl.auth.AuthenticationBasic;

class PulsarConfig {

    @Produces
    @Identifier("prices")
    public ClientConfigurationData config() {
        var data = new ClientConfigurationData();
        var auth = new AuthenticationBasic();
        auth.configure(Map.of("userId", "superuser", "password", "admin"));
        data.setAuthentication(auth);
        return data;
    }
}

mp.messaging.incoming.your-channel-name.attribute=value

pulsar.consumer.subscriptionInitialPosition=Earliest

pulsar.producer.batchingEnabled=false

mp.messaging.incoming.your-channel-name.numIoThreads=4

pulsar.client.serviceUrl=pulsar://pulsar:6650