Ways to Sync Data in mobile (Android)

Transcript

1. n ways to sync data for mobile apps Selva github.com/selvakn Geeknight Chennai
2. About The Application Quick overview Transform class room teaching and learning Using Android Tablets For school teachers and students More effective With classroom activities And assignments · · · · · ·
3. Challenges Share Content Assignments · Videos eBooks Documents - - - · Reading Quiz Short Answer Explore - - - - Inclass Activities · Discussions Comments Quick Poll Call a student (randomly) - - - -
4. What exactly is the problem Now the technical part Push Content In realtime To 1000s of tablet concurrently Broadcast - sometimes To a subset of tablet - sometimes Offline Platform - Support multiple apps · · · · · · ·
5. Setup
6. Setup
7. Setup
8. Setup
9. Poll for data changes
10. Poll for data changes
11. Poll for data changes
12. Poll for data changes Pros Cons Tablet posts the content to server Poll for its content At regular intervals With android services The server returns only the deltas · · · · · Simplest Solution Possible Offline tablets gets the data back when online · · Createing contents Offline (Read Only) Server scalling Battery life · · ·
13. XMPP
14. XMPP
15. XMPP
16. XMPP Pros Cons Group Chat! Openfire - xmpp server asmack - xmpp client for android Messages which are time critical Class attendance OK if offline tablets misses them · · · · · · 0 server side code Good for chat like interactions · · Persistent messages Scaling - cocurrent connections Reliability · · ·
17. GCM Google Cloud Messageing
18. GCM Google Cloud Messageing
19. GCM Google Cloud Messageing
20. GCM Google Cloud Messageing
21. GCM Google Cloud Messageing
22. GCM Google Cloud Messageing
23. GCM Google Cloud Messageing
24. GCM Google Cloud Messageing Pros Cons Push notifications Messages upto 4k Collapsing · · · Good for battery life Server side scalling - no polling · · Still readonly while offline Not 100% reliable · ·
25. Event Souring http://martinfowler.com/eaaDev/EventSourcing.html Capture appliaction state as events As a sequence Can be applied in the same order to get the current state Like a Version Control System All parties in the system just speaks events · · · · ·
26. Event Sourcing Structure of an Event { " u u i d " : " 0 0 0 0 0 1 3 a - e 6 b e - 8 1 4 8 - 1 2 c 5 - 0 3 6 0 6 0 2 e c 2 7 8 " , " t i m e s t a m p " : 1 3 6 6 3 8 8 8 1 4 , " e v e n t T y p e " : " P o s t C r e a t e d E v e n t " , " c r e a t e d B y U s e r I d " : 1 , " a u t h T o k e n " : " s o m e a u t h t o k e n " , " d a t a " : { " s o m e A t t r i b u t e " : " s o m e V a l u e " , " a n o t h e r A t t r i b u t e " : " a n o t h e r V a l u e " } , " s c o p e " : [ 1 , 1 2 0 3 , 3 4 5 ] } J S O N
27. Event Sourcing
28. Event Sourcing
29. Event Sourcing
30. Event Sourcing
31. Event Sourcing Pros Cons Data agnostic service Each node can device what to listen to Scaling · · · Every party needs to talk event Very hard to integrate with non-event based systems · ·
32. Using CouchDB A NoSQL datastore Distributed - replica copies Schema free JSON documents Incremental master-master replication · · · · ·
33. CouchDB
34. CouchDB
35. CouchDB
36. CouchDB
37. CouchDB
38. CouchDB Cons Heavy - for a android device 10s boot time :( · ·
39. TouchDB Light weight CouchDB compatible Uses SQLite Good enough for mobile Replicate data with CouchDB · · · · ·
40. TouchDB
41. TouchDB
42. Thank You Selva github.com/selvakn