RESTEasy Reactive is a JAX-RS implementation built for Quarkus that is async by default using Vert.x. It provides reactive support with Mutiny and has an ultra-fast architecture using code generation and endpoint pipelining. RESTEasy Reactive makes REST endpoints non-blocking and faster by default while also supporting blocking use cases. The presentation demonstrates how to make endpoints faster using RESTEasy Reactive and encourages feedback on the framework.

1. RESTEasy Reactive : why should I care?
Stéphane Épardaud, Red Hat. @UnFroMage

2. We always need a plan, even if we don’t follow it
● A brief glimpse at why you should care about async, reactive, blocking
○ And all those event-loop, IO Thread, Worker Thread terms that hipsters and C programmers
use
● How can I turn my REST endpoints from rusted, slow, old-style to golden
buzzword-enabled syrup?
○ DEMO!!!
● This item was placed here just to check if anybody is reading this, but it
doesn’t matter we won’t have time to cover it anyway
● Recap and Questions

3. Alright, why should I care?

4. Traditional architecture: IO and worker threads

5. But… they’re all sleeping???

6. User

7. More efficient architecture: non-blocking by default

8. A truly modern architecture

9. So what is RESTEasy Reactive?
● JAX-RS implementation redone from scratch (client and server)
● Built for Quarkus
○ Async by default, using Vert.x
○ Reactive support with Mutiny
○ Ultra-fast architecture
■ Code generation, no reflection
■ Endpoint pipelining
■ Dead steps elimination
○ Better APIs
○ Better defaults
○ Small footprint
○ Dev UI support
● Great in conjunction with Mutiny, the Vert.x reactive SQL clients and
Hibernate Reactive!

11. But is it hard to make my endpoint faster-than-light?

12. Demo Time!

13. Recap
● Import quarkus-resteasy-reactive*
● Non-blocking by default
○ Also supports blocking use-cases: use @Blocking
● Faster by default
○ If you don’t need more speed, perhaps you need the usability improvements?
● We’re looking for feedback, so don’t hesitate to throw some our way!
● Get quarkus-resteasy-reactive for free today with the #RROSS
coupon
○ Offer good forever
■ There’s no fine print
● Well there is but it’s just a joke

14. This slide intentionally left plank