Ubuntu Application Lifecycle
- 1. Ubuntu Application Lifecycle Or: How I learned to stop worrying and trust application developers Ubuntu Application Lifecycle Or: How I learned to stop worrying and trust application developers Ted Gould ted@canonical.com @tedjgould Texas Linux Fest 22 Aug 2015
- 2. “I'm more worried about Murphy than I am Machievilli” — Michi Henning
- 5. © Andy Armstrong — CC-BY-SA — https://www.flickr.com/photos/andyarmstrong/190078748/ Dead Battery
- 6. © Josh Hallett — CC-BY — https://www.flickr.com/photos/hyku/368912557/ Data Protection
- 7. © Antti T. Nissinen — CC-BY — https://www.flickr.com/photos/54177777@N00/373864777/ Physical Destruction
- 10. App App
- 13. Infinite App Illusion Technical User How many apps can I run? 1 GB RAM 1 GHz Quad Core
- 18. Stateless Active Stopped Paused Linux Kernel OOM Killer (want to include graphics resources in the future)
- 20. What happens: ● App is asked to save state ● Graphic buffers grabbed for screenshot ● Timeout, then all processes are sent SIGSTOP Paused Active Stateless Stopped
- 22. Positive: Ask to save state nicely via life cycle Stop using processing when not asked Negative: SIGSTOP apps SIGKILL apps on OOM killer
- 23. Likelytobekilled Stopped App Untrusted Helpers Active Application Unity
- 24. Trusted Helpers ● Download Manager — Downloads content to the device while the application isn't focused. ● Push Messages — Background process that collects JSON messages targeted at app/user ● Location Service — Uses GPS and other sources to establish location continually. ● Content Hub — Shares files between application contexts securely. ● Media Hub — Plays audio files and play lists.
- 26. App URL Dispatcher Upstart Browser Unity USER Click on a link Show the browser
- 27. File Server Push Message Download Manager App Push Server Save in App Cache New File Simple Sync
- 28. Request permission at time of use
- 29. Ubuntu Applications are: ● Confined — By default the applications are restricted from using a lot of functionality that might be expected from a traditional Linux user session. ● Managed — The application lifecycle works to keep the user in control of what is draining the battery and using resources. ● Have Friends — Trusted helpers provide ways to implement the functionality you need and work with confinement. Review
- 31. © Stéfan — CC-BY-SA — https://www.flickr.com/photos/st3f4n/143623934