Couchbase Mobile on Android

Transcript

1. How to develop offline-first on Android Droidcon Stockholm, 2015 James Nocentini, Developer Advocate @ Couchbase
6. Win a MOTO 360!!
7. DATA SYNCING & SHARING
8. Couchbase Mobile features • Replication • Transparent availability of data on server & client • Full offline functionality • Data orchestration • Smart routing of data to its users • Subsetting data sets for different use cases goo.gl/yuhnvt
9. Couchbase Lite • Embedded database library for mobile apps • Flexible, schemaless data model ("NoSQL") • Querying by map/reduce views • Active change notifications, for reactive UIs • Full-strength multi-master replication goo.gl/yuhnvt
10. Replicating Documents & Revisions B: "What’s new since we last spoke?" A: "I added rev #3-a9ff of doc1." B: "That’s new to me!" A: "I’ll send it over…" doc1 3-a9ff doc1 2-c31b A B
11. Data Orchestration { "_id": "9432493-940324932-84032", "_rev": "1-bf30-03if-80dw-19sk", "name": "james", "rating": 2.5, "type": "unique" } goo.gl/yuhnvt
12. Data Orchestration function(doc, oldDoc) { channel(doc.name); } Result goo.gl/yuhnvt doc1 doc2
13. Sync Function channel(channel_name) access(user_name, channel_names) requireAccess(channel_names) role(role_name, user_name) requireRole(role_name) requireUser(user_name) goo.gl/yuhnvt
14. Sync Function • Read: access • Write: requireAccess, requireUser, requireRole • Grant a user access to multiple channels by simply assigning a role • Any user can give another user access goo.gl/yuhnvt
15. Channels, roles and users goo.gl/yuhnvt User 1 User 2 User 3 Channel X Channel Y Channel Z Channel X Channel Y Channel Z Channel X Channel Y Channel Z
16. Channels, roles and users goo.gl/yuhnvt User 1 User 2 User 3 Role Channel X Channel Y Channel Z
17. Channels, roles and users goo.gl/yuhnvt User 1 User 2 User 3 Role Channel X Channel Y Channel Z
18. Data Orchestration function(doc, oldDoc) { channel(doc.user); access("GUEST", doc.user); } Result goo.gl/yuhnvt doc1 doc2 doc2 doc1
19. Data Orchestration { "_id": "9432493-940324932-84032", "_rev": "1-bf30-03if-80dw-19sk", "name": "james", "rating": 4, "type": "unique" } goo.gl/yuhnvt
20. Conflicts { "_id": "james", "_rev": "1-bf30-03if-80dw-19sk", "rating": 3, "type": "conflict" } goo.gl/yuhnvt
21. Conflicts { "_id": "james", "_rev": "1-bf30-03if-80dw-19sk", "rating": 4, "type": "conflict" } Result (in turn scenario = no conflict) goo.gl/yuhnvt doc1 (rev-1) doc1 (rev-1) { "_id": "james", "_rev": "1-bf30-03if-80dw-19sk", "rating": 4, "type": "conflict" }
22. Conflicts { "_id": "james", "_rev": "1-bf30-03if-80dw-19sk", "rating": 4, "type": "conflict" } Result (in turn scenario = no conflict) goo.gl/yuhnvt doc1 (rev-1) doc1 (rev-2) { "_id": "james", "_rev": "1-bf30-03if-80dw-19sk", "rating": 4, "type": "conflict" }
23. Conflicts { "_id": "james", "_rev": "1-bf30-03if-80dw-19sk", "rating": 4, "type": "conflict" } Result (both offline scenario = conflict) goo.gl/yuhnvt doc1 (rev-1) doc1 (rev-1’)
24. Conflicts { "_id": "james", "_rev": "1-bf30-03if-80dw-19sk", "rating": 4, "type": "conflict" } Result (both offline scenario = conflict) goo.gl/yuhnvt doc1 (rev-1) doc1 (rev-1’) doc1 (rev-1)
25. Peer-To-Peer URL url = new URL("http://10.8.4.3:5984/votingapp");
 Replication r = Replication.createPushReplication(url);
 r.start(); Result doc1 doc1 Credentials credentials = new Credentials("", "");
 LiteListener listener = new LiteListener(manager, 5984, credentials);
 listener.start(); B A A B
26. PhotoDrop goo.gl/yuhnvt
27. Benefits Of Peer-To-Peer • End-user privacy • Unmetered high bandwidth connections • Useable with no Internet infrastructure • Cellular "dead zones" • Wilderness • Disaster areas goo.gl/yuhnvt
28. Drawbacks Of Peer-To-Peer • Less reliable • Hard to securely identify users or authenticate content • Difficult to scale up • On a LAN: Bandwidth growth • Beyond a LAN: Connectivity and peer discovery goo.gl/yuhnvt
29. Hybrid Approaches • "A server is just a well-connected peer" • Clients can connect to local peers and to a server
30. More Information James Nocentini Developer Advocate @jamiltz, jamesn@couchbase.com RatingApp on GitHub http://github.com/couchbaselabs/mini-hacks/rating-app