Bridge CDI event to Microprofile Reactive Message broker - apache-kafka

Question

I followed the Quarkus - Using Apache Kafka with Reactive Messaging to create a sample to taste it, I changed message flow like this:
When a post is saved, fire an event by CDI.
Received the CDI and send to Kafka topic.
Read the data from Kafka topic, and expose it as SSE to the client.
The config for Kafka messaging, part of application.properties.
# Consume data from Kafka
mp.messaging.incoming.activities.connector=smallrye-kafka
mp.messaging.incoming.activities.value.deserializer=io.vertx.kafka.client.serialization.JsonObjectDeserializer
# Produce data to Kafka
mp.messaging.outgoing.activitiesOut.connector=smallrye-kafka
mp.messaging.outgoing.activitiesOut.topic=activities
mp.messaging.outgoing.activitiesOut.value.serializer=io.vertx.kafka.client.serialization.JsonObjectSerializer
The event handling class for CDI event and reactive messages.
#ApplicationScoped
public class ActivityStreams {
ReplaySubject<JsonObject> replaySubject;
Flowable<JsonObject> flowable;
#PostConstruct public void init() {
replaySubject = ReplaySubject.create();
flowable = replaySubject.share().toFlowable(BackpressureStrategy.BUFFER);
}
public void onActivityCreated(#ObservesAsync Activity activity) {
replaySubject.onNext(JsonObject.mapFrom(activity));
}
#Outgoing("activitiesOut")
public Publisher<JsonObject> onReceivedActivityCreated() {
return flowable;
}
#Incoming("activities")
#Outgoing("my-data-stream")
#Broadcast
public Activity onActivityReceived(JsonObject data) {
Activity activity = data.mapTo(Activity.class);
activity.setOccurred(LocalDateTime.now());
return activity;
}
}
When I tried to expose it as SSE, it does not work as expected.
#Path("/activities")
#ApplicationScoped
public class ActivityResource {
#Inject
#Channel("my-data-stream")
public Publisher<Activity> stream;
#GET
#Produces(MediaType.SERVER_SENT_EVENTS)
#SseElementType(MediaType.APPLICATION_JSON)
Publisher<Activity> eventStream(){
return stream;
}
}
In the console logging, I saw the message sent to activities queue, but there is no further steps to SSE. And when I accessed the sse endpoint by curl, it always returned a Not found status.
curl -v -N -H "Accept:text/event-stream" http://localhost:8080/activities --connect-timeout 60
...
HTTP/1.1 404 Not Found
The complete sample code is here.