DroidConEgypt-21-10-2022-Coroutines-AhmedNabil.pdf
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A presentation conducted on 21-10-2022 at Droidcon Egypt 22 #dcegy22 showing the different approaches to implement async programming and how is Kotlin coroutines compared to them and solve their common problems.
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DroidConEgypt-21-10-2022-Coroutines-AhmedNabil.pdf
- 1. A Journey from Callback Hell to Kotlin Coroutines Ahmed Nabil Kotlin Egypt @AhmedNMahran Fri. Oct 21 2022
- 2. About Me About Me ● Writing Code since I was 11 ● ~10 years in Mobile App development ● Given talks to thousands of audiences ● Prev. Android Mentor at 1M Arab Coders. ● Worked at Hungerstation,Codly, and others. ● Software Tech. Lead at Vodafone (_VOIS). ● Head of Kotlin Egypt. ● Content creator (videos/articles) Fri. Oct 21 2022
- 3. About Me What is Kotlin ? Fri. Oct 21 2022
- 4. About Me Kotlin ● A modern Programming Language. ● Developed by Jetbrains & Open-Source community ● Since 2010. ● Current Stable Version is 1.7.20 (as of 20-10-2022) Fri. Oct 21 2022
- 5. About Me Used to develop ● Multiplatform-Mobile ● Server-Side ● Web Front-End ● Android ● WatchOS ● Data Science ● and more Fri. Oct 21 2022
- 6. About Me Let the journey Begin Fri. Oct 21 2022
- 7. Fri. Oct 21 2022
- 8. Fri. Oct 21 2022
- 9. About Me ANR ● any operation > 16ms may cause Lag ● I/O operations, long-running operation ● Main thread should ONLY do UI operations Fri. Oct 21 2022
- 10. Fri. Oct 21 2022
- 11. About Me Problem Code running in Main thread causing Crash or Lag. Fri. Oct 21 2022
- 12. About Me Asynchronous Code Fri. Oct 21 2022
- 13. About Me Approaches ● Threading ● Callbacks ● Futures, Promises ● Reactive Extensions (Rx) ● Coroutines Fri. Oct 21 2022
- 14. About Me Threads A program splits itself into 2 or more running tasks Fri. Oct 21 2022
- 15. About Me Threads Limitations ● Expensive ● Not Infinite, limited with device capabilities ● Not always available, (e.g. JS doesn’t have threading) ● Hard to Error-handle and debug Fri. Oct 21 2022
- 16. Fri. Oct 21 2022
- 17. About Me Callbacks a function sent as an argument to another function to be executed at certain point in time. Fri. Oct 21 2022
- 18. Fri. Oct 21 2022
- 19. About Me Callback Limitations ● Nested Callbacks not easy to understand ● Hard to Error-handle and debug Fri. Oct 21 2022
- 20. Fri. Oct 21 2022
- 21. About Me Futures and Promises I promise I’ll return at some point in the future. Fri. Oct 21 2022
- 22. About Me Limitations ● Nested Callbacks not easy to understand ● Return Type : Needs changing the models (extra steps in getting the data) ● Hard to Error-handle and debug Fri. Oct 21 2022
- 23. About Me Rx Everything is a stream and it’s observable Needs learning new apis :( Fri. Oct 21 2022
- 24. About Me Coroutines Kotlin’s approach to work with async. code Fri. Oct 21 2022
- 26. About Me Coroutines ● No new apis needed, same language used (kotlin) ● Return type doesn’t change. ● Write sequential code while being thread-safe ● Lightweight, can run many of them in one thread, ● Easy to switch between threads ● Platform independent ● Easy to debug and detect errors. Fri. Oct 21 2022
- 27. Fri. Oct 21 2022
- 28. Don’t Miss My Workshop 6:00 PM today Fri. Oct 21 2022
- 29. About Me Follow Me @AhmedNMahran Thanks! Youtube (contains all my links) Fri. Oct 21 2022
- 30. Thanks Ahmed Nabil Kotlin Egypt @AhmedNMahran Fri. Oct 21 2022