Bringing Reactive to Enterprise Java Developers Julien Ponge, Thomas Segismont and Clement Escoffier Red Hat

Reactive Summit 2018 2 Hello! We work on Eclipse Vert.x, a toolkit for writing asynchronous and reactive applications on the JVM

Reactive Summit 2018 3 (s a l p u ) 50% off with mlponge code

Reactive Summit 2018 4

Reactive Summit 2018 5 Vert.x MicroProfile Jakarta EE Introducing reactive to the EE world ...without breaking everything!

Times change quickly

Reactive Summit 2018 7 ‘14 Java EE 8 ‘17 From Java EE to Jakarta EE ‘13 Java EE 7 ‘07 JAX-RS ‘09 CDI (Java EE 6) Microservices Docker Kubernetes Reactive manifesto ‘12 Vert.x Node.js MVC 1.0 ‘11 Kafka Serverless

Reactive Summit 2018 8 Typical use-case CRUD Database with ORM Development model CDI (injection) JAX-RS (REST API) JPA, Bean Validation, JTA, Management... Execution model Servlets 1 thread per request Java EE: a feet in the past

Reactive Summit 2018 9 Not cloud-friendly, not reactive Based on the concept of application server ➔ 1 server = many applications Does not fit the “cloud model” ➔ Small, lightweight applications ➔ Each service in its own process

Reactive Summit 2018 10 Not cloud-friendly, not reactive Most of the model is synchronous except ● Asynchronous servlets ● CDI events Also: ➔ No stream support ➔ No back-pressure

Reactive Summit 2018 11 A new hope? MicroProfile - the rogue child ➔ A new set of specs ➔ Microservice-friendly ➔ Very iterative ➔ Reactive working group! Jakarta EE ➔ New spec model ➔ Faster processes ➔ Growing interest for reactive

Reactive and MicroProfile

Reactive Summit 2018 13 Traction from: Lightbend, Red Hat, Oracle, IBM Reactive Microprofile specifications Reactive Streams Operators Reactive Messaging Concurrency

Reactive Summit 2018 14 JAX-RS and reactive Stream data as SSE

Reactive Summit 2018 15 Reactive Messaging (and data streaming)

Reactive Summit 2018 16 Reactive Messaging (and data streaming) Manuel, pre and post processing

Reactive Summit 2018 17 Reactive Stream Operators Compose and transform

Demos* * no rabbits were harmed in the making of this.

Reactive Summit 2018 19 Step #1 RestEasy, server-sent events and reactive streams Server {sleeping, awake, eating}

Reactive Summit 2018 20 Step #2 Introducing MicroProfile Reactive Messaging HealthDataBean (temperature, heartbeat, pressure) Neo (sleeping, awake, eating) Processor state Health data Heartbeat

Reactive Summit 2018 21 Step #3 Introducing MicroProfile Reactive Streams Operators HealthDataBean (temperature, heartbeat, pressure) Processor Health data Heartbeat HTTP Client (Vert.x) Snapshot service (latest data) Health data Health data 1 2

Reactive Summit 2018 22 Step #4 Health data comes from MQTT Processor Health data Heartbeat HTTP Client (Vert.x) Snapshot service (latest data) Health data Health data 1 2 MQTT

Reactive Summit 2018 23 Step #5 Event-driven and asynchronous microservices MQTT Kafka Collector service Snapshot service Web application Health data Events split by topic SSE HTTP Events

Before we wrap up...

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Reactive Summit 2018 26 JAX-RS Vert.x CDI (Weld) RestEasy Reactive Messaging Vert.x-powered MQTT Apache Kafka Apache Camel AMQP 1.0 Reactive Stream Ops Vert.x + RxJava2 SmallRye

Reactive Summit 2018 27 Roadmap ● MicroProfile Reactive Stream Operators ○ Approaching 1.0 ○ Starting to infuse in the other MicroProfile specifications ○ Integration in the next MicroProfile release (February 2019) ● MicroProfile Reactive Messaging ○ Data streaming and Event-driven microservice ○ Integration in the next MicroProfile release (February 2019) ● MicroProfile Concurrency ○ Async context propagation

Reactive Summit 2018 28 (s a l p u #2) 50% off with mlponge code

Q&A @jponge @tsegismont @clementplop

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