The document discusses making applications resilient to network failures by embracing an offline-first development approach. It recommends using service workers to cache assets and enable offline access. It also recommends using a database like CouchDB that supports offline access through features like document syncing and a changes feed. The presentation provides an overview of CouchDB and recommends some open-source libraries for working with CouchDB, such as PouchDB. It emphasizes that offline access should be the expected experience rather than an exception, and that applications should leverage techniques like caching and syncing to handle network failures gracefully.

1. M A K I N G Y O U R A P P R E S I L I E N T
T O N E T W O R K FA I L U R E S
O F F L I N E - F I R S T

2. W H O A M I ?

4. M A K I N G Y O U R A P P R E S I L I E N T
T O N E T W O R K FA I L U R E S
O F F L I N E - F I R S T

5. M O B I L E W O R L D
W E L I V E I N A N I N C R E A S I N G LY

7. B E I N G O F F L I N E I S A G I V E N ,
N O T A N E X C E P T I O N .

8. H O W C A N A P P L I C AT I O N
D E V E L O P E R S H A N D L E T H I S ?

9. N O T M Y P R O B L E M

10. N O T I F Y T H E U S E R
E R R O R H A N D L I N G

11. H A N D L E I T C A S E B Y C A S E

13. O F F L I N E - F I R S T D E V E L O P M E N T

14. S E R V I C E W O R K E R S
“A service worker is a script that your browser runs in the
background, separate from a web page, opening the
door to features that don't need a web page or user
interaction.”

15. S E R V I C E W O R K E R S
“Using service worker you can hijack connections,
fabricate, and filter responses. Powerful stuff.”
https://developers.google.com/web/fundamentals/
getting-started/primers/service-workers

16. S E R V I C E W O R K E R S
I’m not here to talk about Service Workers..

17. D ATA S Y N C
I ’ M H E R E T O TA L K A B O U T

18. C O U C H D B

19. F E AT U R E S
• Document database
• Versions
• Changes Feed
• Sync

34. S O M E O P E N - S O U R C E
• POUCH-CLERK
• https://github.com/pgte/pouch-clerk
• Example app
• https://github.com/pgte/pouch-clerk-example-app

35. D E M O T I M E !

36. TA K E - A WAY S
• Offline is a given, not an exception
• You should not handle networking errors case-by-case
• Embrace offline-first techniques
• Sync is your friend

37. T H A N K Y O U !
O N S L I D E S H A R E :
bit.ly/2pkU4pQ

38. Q U E S T I O N S ?

39. C R E D I T S
• Hans Kylberg - https://www.flickr.com/photos/visulogik/1619008375
• Vodafone UK slide: Jake Archibald, Google I/O
• Machinery: Franz Zajizek, Astronomical Clock Machinery - https://
commons.wikimedia.org/wiki/File:Vienna_-
_Vintage_Franz_Zajizek_Astronomical_Clock_machinery_-_0518.jpg
• HospitalRun images: @ Cure.org
• Monolith: Expo Murten: https://commons.wikimedia.org/wiki/File:
20020719_Expo_Murten_10.JPG