Reactive Streams and the Wide World of Groovy
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This talk offers a description of Reactive Streams, along with example code using the Groovy language and rxGroovy
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Reactive Streams and the Wide World of Groovy
- 1. Reactive Streams and the Wide World of Groovy Steve Pember CTO, ThirdChannel THIRDCHANNEL @svpember
- 2. “Reactive Streams”, “Reactive Extensions”, or “Rx”
- 3. THIRDCHANNEL @svpember Agenda • The Problem • What are Reactive Streams? • … Did someone say ‘Groovy’? • Rx in depth • Demo Time!
- 4. THIRDCHANNEL @svpember The Problem: The Need to go Reactive
- 5. Really, it’s Two problems
- 6. THIRDCHANNEL @svpember 1) Performance Demands Are Always Increasing
- 8. We Use Technology from the Beginning of Web Development
- 10. Things Slow Down
- 12. –Johnny Appleseed “Type a quote here.”
- 13. Let’s Keep Our Users Happy And Engaged
- 14. THIRDCHANNEL @svpember 2) The Rise of Microservices
- 16. It’s Not Only Users That Use Up Resources
- 17. So what to do?
- 18. Free up resources with Async Operations & Non- Blocking I/O
- 19. Async is Hard for Humans
- 20. THIRDCHANNEL @svpember Agenda • The Problem • What are Reactive Streams?
- 23. Single abstraction over data from many sources
- 25. Observer Pattern Push (not Pull) based Iterators
- 28. Groovy Collections supports stream-like options
- 29. If this makes sense to you, then you’re ready for Rx
- 30. Streams with Extensions for Reactive Programming
- 31. Rx makes Async behavior easy!
- 34. THIRDCHANNEL @svpember What is Rx? • Collections + Time • A Single Abstraction over data from different sources • Observer Pattern with Push-based iterators • Stream Based Functional Programming • … with Extensions for Reactive Programming • Async is easy • Backpressure
- 35. Rx Simplifies Complex Work
- 37. THIRDCHANNEL @svpember Agenda • The Problem • What are Reactive Streams? • … Did someone say ‘Groovy’?
- 39. THIRDCHANNEL @svpember We should probably mention RxJava
- 41. But Quickly Switch to rxGroovy
- 44. THIRDCHANNEL @svpember • High performance web framework • Non-opinionated • Non-Blocking Network Stack • Built on Reactive Streams, Netty, Java 8, Guice • Fully embodies reactive • Light-weight, self-contained deployables Take a Look at Ratpack
- 46. Includes rxRatpack module, but we’ll talk about that later
- 47. THIRDCHANNEL @svpember Agenda • The Problem • What are Reactive Streams? • … Did someone say ‘Groovy’? • Rx in depth
- 48. … our as much as we can get through
- 50. An Observable is like Promise ++
- 51. An Observable pushes items to Subscribers
- 52. Subscribers receive and operate on emitted data
- 53. Observables and Subscribers operate on a Scheduler
- 57. Thankfully, there are shortcuts
- 62. THIRDCHANNEL @svpember You can get much power from 5 functions • filter • map • reduce • groupBy • flatMap
- 67. First Mental Leap: An Observable of Observables
- 68. –Johnny Appleseed “Type a quote here.”
- 71. THIRDCHANNEL @svpember Hot vs Cold
- 72. Cold Observable: finite data, on demand Hot Observable: infinite data, as it’s ready
- 79. THIRDCHANNEL @svpember Can only Mitigate Hot Streams • throttle • sample • window • buffer • drop
- 81. Don’t Unsubscribe from Observables Programmatically complete them when another Observable fires
- 83. THIRDCHANNEL @svpember AutoComplete Requirements • Wait 250 ms between keypresses before querying • If no keys are pressed, no query • Successful queries should render movies • Any new queries should kill in-flight queries
- 86. THIRDCHANNEL @svpember Demo Time: Ratpack Revisited
- 89. THIRDCHANNEL @svpember More Information • Reactive Groovy & Ratpack Demo: https://github.com/spember/reactive-movie-demo • Jafar Husain: RxJS: https://www.youtube.com/watch?v=XRYN2xt11Ek • Reactive Streams Spec: http://www.reactive-streams.org/ • Reactive Manifesto: http://www.reactivemanifesto.org/ • Akka: http://akka.io/ • rxJava / ReactiveX libraries: https://github.com/ReactiveX • Ratpack: http://ratpack.io/ • Reactor: https://github.com/reactor/reactor • The Introduction to Reactive Programming you’ve been missing: https://gist.github.com/staltz/868e7e9bc2a7b8c1f754 • Martin Fowler: Stream / Pipeline programming: http://martinfowler.com/articles/refactoring-pipelines.html • Or Just on Groovy (Groovy the Awesome Parts): http://www.slideshare.net/SpringCentral/groovy-the-awesome-parts • Ratpack Web Presentation: http://www.infoq.com/presentations/ratpack-2015
- 90. Images • Empty Pool: http://www.wtok.com/home/headlines/Water-Problems-205987121.html • Juggling: https://en.wikipedia.org/wiki/Juggling • Directing Traffic: https://www.flickr.com/photos/tracilawson/3474012583