Reactive programming - Dirk Janssen (presentation 13th SPIN Meetup)
Download as PPTX, PDF0 likes277 views
This document discusses reactive programming and some reactive frameworks and concepts. It defines reactive programming as programming with asynchronous data streams. It discusses some reactive programming components like Vert.x, Ratpack, and ReactiveX. It provides more details on Vert.x, describing it as event-driven, asynchronous, and non-blocking. It also discusses key Vert.x concepts like the event loop, verticles, and the event bus.
![Four fundamental effects of programming
One Many
Sync T iterable[T]
Async Future[T] Observable[T]](https://image.slidesharecdn.com/reactiveprogrammingv1-180501174344/85/Reactive-programming-Dirk-Janssen-presentation-13th-SPIN-Meetup-5-320.jpg)
Reactive programming - Dirk Janssen (presentation 13th SPIN Meetup)
- 1. Reactive Programming Dirk Janssen – Integratie Consultant
- 2. Reactive Manifesto “Systems built as Reactive Systems are more flexible, loosely-coupled and scalable. This makes them easier to develop and amenable to change. They are significantly more tolerant of failure and when failure does occur they meet it with elegance rather than disaster. Reactive Systems are highly responsive, giving users effective interactive feedback.”
- 3. What do they mean?
- 4. Simplified explanation “Reactive programming is programming with asynchronous data streams.”
- 5. Four fundamental effects of programming One Many Sync T iterable[T] Async Future[T] Observable[T]
- 6. Reactive Components • Vert.x • Ratpack • ReactiveX (C#, Java, Scala, JavaScript, Python, …) • Akka Streams • React • (Reactive) Spring 5 • etc.
- 7. Vert.x ● Vert.x the plain old jar file ● Event Driven ● Asynchronous ● Non Blocking ● Event Loop
- 8. Event Loop ● Verticles ● Multi-reactor Pattern.
- 9. The golden rule Don’t Block the Event Loop!
- 10. Why Vert.x for microservices ● TCP, UDP, HTTP clients ● MongoDB, JDBC, SQL, Redis, MySQL/PostgreSQL ● Openshift support ● Camel bridge ● Etc.. (http://vertx.io/docs/)
- 11. Verticle ● Smallest unit of deployment ● Deploy with Vert.x ● Runs on the event loop ● Types ● Standard; ● Worker verticle; ● Multi-threaded worker verticle.
- 12. Event-bus ● Messaging between verticles; ● Point to Point ● Publish / subscribe ● Request / Reply ● Polyglot
- 13. Hello, World!
- 14. Callback hell
- 15. RxJava(2) ● ReactiveX ● Observer pattern; ● Event and Data Flows; ● Asynchronous; ● Non blocking.
- 16. Observable ● Speaker ● (Operator) ● Listener
- 17. Observable ● Events ● onNext ● onError ● onCompleted ● Subscribe ● Hot vs Cold
- 18. Observable types ● Observable ● Single ● Maybe ● Flowable ● Completable
- 19. Operators ● Zip; ● Merge; ● FlatMap; ● Skip; ● Count; ● Filter; ● Etc...
- 22. Callback hell
- 24. Threading ● Single threaded ● Multi-threaded ● ObserveOn ● SubscribeOn; ● Easy, or not...