Bring Reactive to Java Enterprise Developer demo

Build

mvn clean install

Demos

Demo 1

The demo 1 illustrates how you can bridge Reactive Streams and Jax-RS. It forwards data from a Publisher into a SSE stream.

Demo 2

The demo 2 illustrates how to use MicroProfile Reactive Messaging to process data conveyed into a Reactive Stream. It shows how to generate streams using MicroProfile Reactive Messaging @Outgoing annotation and how the items are manipulated one by one as in:

  @Incoming("health")
  @Outgoing("heartbeat")
  public JsonObject filtered(JsonObject input) {
    LOGGER.info("Received {}", input.encode());
    return input.getJsonObject("heartbeat");
  }

Demo 3

The demo 3 extends demo 2 but manipulate streams instead of individual items. It also shows how asynchronous action (here a call to a remote service) can be integrated into the pipeline.

Demo 4

The demo 4 introduces transport connectors. The data is no more generated in the same application, but in another application and sent to a MQTT broker. The web application retrieves the data from MQTT and send it to the web frontend.

Demo 5

Demo 5 is all about event-driven and asynchronous microservices. It is composed by:

• a sensor application sending data to a MQTT broker
• a processor application manipulating data from MQTT and forwarding it to Kafka
• a snapshot service which is a simple HTTP microservice
• a web application retrieving the data from Kafka, acknowledge the messages and forward them to the UI.

This demo shows:

• Kafka and MQTT support
• Acknowledgement policies