Skyrocket your performance with background tasks

My talk at Flutter Day India 2020 - Isolates - Background Tasks with Workmanager

Transcript

1. Skyrocket your performance with Background Tasks MAX WEBER – FLUTTER DAY INDIA 2020
2. About Me u Founder of FlutterExplained u Software Engineer u Consultant u Trainer u Public Speaker @flutter_exp FlutterExplained
3. Intro into Background Tasks u Long Running Tasks besides of Flutter u Your app is currently not active but performs tasks u Two different “background” states u Background State u “Destroyed” State
4. Isolates u Isolate is a contained instance of Dart u It has its own uEvent Loop uMemory
5. Overview
6. We start easy…
7. Create an Isolate
9. Helper: compute Function u Compute is a helper function u Creates an Isolate and runs in background u Less boilerplate u Returns a value u Limited Functionality
10. Isolates work fine… For apps that are in background Performs heavy calculation tasks Allow Multi thread in Dart Speed up your applications! but… Stops when FlutterActivity is destroyed
11. App suspended, what now? u Plugins to the rescue u Native Device Code starts up Flutter Engine u Runs our Dart Code u Downsides u Super code heavy u Native Code u No / Few Documentation
12. Documentation
13. Background Behavior Android u AlarmManager u JobService u Firebase Job Dispatcher u WorkManager iOS u Minimum background fetch interval u iOS could decide never execute our code
14. Workmanager Package u Facilitates the u Android WorkManager u iOS performFetchWithCompletionHandler u Reduces installation effort to a minimum u No Native Code in Kotlin or Swift
15. Setup WorkManager
17. CallbackDispatcher (Isolate)
18. Conclusion u Isolates u improve your apps performance u Careful with “overengineering” u Background Tasks u iOS and Android have different approaches u Both are not perfectly flexible u Recommendation to use a package
19. Ressources u https://medium.com/vrt-digital-studio/flutter-workmanager-81e0cfbd6f6e u https://medium.com/flutter/executing-dart-in-the-background-with- flutter-plugins-and-geofencing-2b3e40a1a124 u https://flutter.dev/docs/development/packages-and-plugins/developing- packages u https://medium.com/stuart-engineering/keep-flutter-running-background- on-android-6ffc85be0234 u https://pub.dev/packages/workmanager
20. ” “ Thank you