A gentle introduction to Kotlin Coroutines

Sample Code: https://github.com/Amejia481/kotlin_coroutine_intro

Transcript

1. A gentle introduction to Kotlin Coroutines Arturo Mejia Twitter: @ArturoMejia481 ArturoMejiaMarmol.com
3. Alternatives @ArturoMejia481 Threads Callbacks RX (Reactive extensions) Futures Promises
4. Threads @ArturoMejia481 Expensive, not easy to use. IOS deprecate threads. DispatchQueue
5. Callbacks @ArturoMejia481 Don't call me, I'll call you!
6. Callbacks @ArturoMejia481 Callback Hell
7. Callbacks @ArturoMejia481 Callback Hell a.k.a Tilted Christmas Tree.
8. Callbacks @ArturoMejia481 Difficult error handling.
9. Promises and Futures @ArturoMejia481
10. Reactive Extensions @ArturoMejia481 You have to change the way that you approach a problem. Operators RX Schedulers Streams
11. @ArturoMejia481 Reactive Extensions
12. @ArturoMejia481 Kotlin Coroutines Do async work the same way, exceptions, loops, etc…
13. @ArturoMejia481 Kotlin Coroutines Clear differences between suspend functions
14. @ArturoMejia481 Kotlin Coroutines Same function signature
15. Coroutines = Lightweight @ArturoMejia481 Threads Coroutines
16. @ArturoMejia481 Kotlin Coroutines
17. Goal @ArturoMejia481 Suspend Dispatchers Coroutine Builders Launch Async/await
18. Suspend @ArturoMejia481 A key word to indicate the compiler that a function can be suspended.
19. Suspend @ArturoMejia481 A suspend function should be called from a coroutine or another suspend function.
20. Suspend @ArturoMejia481 The Kotlin compiler transforms the function to a callback model and uses state machines to know when a function should be suspended or resume.
21. @ArturoMejia481 Coroutine ≈ Threads
22. Let’s get our hands dirty! @ArturoMejia481
23. Launch @ArturoMejia481 Launch is when we want to fire and forget.
24. Async @ArturoMejia481 Async is when we want to run something, then await the result.
25. Dispatchers @ArturoMejia481 DEFAULT (Computational) Uses the # cores of the CPU, not good for computations like I/O, network, disk, etc. IO designed for doing blocking I/O operations, max #64 thread, share the pool with DEFAULT. MAIN designed to operate UI objects. Indicate in which thread pool a coroutine should run
26. Interoperate @ArturoMejia481 kotlinx-coroutines-rx2: Utilities for Rx. kotlinx-coroutines-jdk8: Integration with JDK8 CompletableFuture (Android API level 24). kotlinx-coroutines-android: Designed to operate UI objects.
27. “With a great power, comes responsibility” @ArturoMejia481 Spiderman
28. Questions? @ArturoMejia481
29. Thanks! Twitter: @ArturoMejia481 ArturoMejiaMarmol.com Android Tutorials RayWenderLich.com/u/amejia481