Bringing Reactive to Enterprise Java Developers Julien Ponge, - PowerPoint PPT Presentation

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

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

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

Times change quickly

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

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

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 ➔ 9 Reactive Summit 2018

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

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 ➔ 11 Reactive Summit 2018

Reactive and MicroProfile

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

JAX-RS and reactive E S S a s t a d a a m r e S t 14 Reactive Summit 2018

Reactive Messaging (and data streaming) 15 Reactive Summit 2018

Reactive Messaging (and data streaming) s t p o n d e a p r e l , n u M a g s i n e s r o c p 16 Reactive Summit 2018

Reactive Stream Operators d a n e p o s m C o r m s f o a n t r 17 Reactive Summit 2018

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

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

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

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

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

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

Before we wrap up...

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

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 ○ 27 Reactive Summit 2018

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Q & A @jponge @tsegismont @clementplop

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