Couchbase Mobile Ideathon in Tokyo 2014.08.29: Developing with couchbase lite
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The document outlines the capabilities and features of Couchbase Mobile, particularly focusing on Couchbase Lite for Android and its application in environments with unreliable network connectivity. It highlights the use cases for offline functionality, such as a todo list app named 'todolite', and explains the role of Sync Gateway for data synchronization and user access management. Additionally, it provides resources for further exploration and mentions upcoming events related to Couchbase.
Couchbase Mobile Ideathon in Tokyo 2014.08.29: Developing with couchbase lite
- 1. Couchbase Mobile Ideathon Traun Leyden Lead Android Developer [email protected] 10/29/13
- 2. About me • I was previously at a startup company doing a mobile CRM app — we converted our app to Couchbase Lite to solve networking performance issues • Now I work full time as the lead developer on Couchbase Lite Android • I also work on demo apps on both iOS and Android • I have blog at http://tleyden.github.io
- 3. About Couchbase • Was the merger of two companies • CouchOne (commercial support for CouchDB) • Membase (a commercially supported / distributed version of memcached) • Our flagship product is Couchbase Server, a fault tolerant distributed database. • We recently released Couchbase Mobile, targeted towards mobile and embedded devices/sensors. • All of our products are released as Open Source software under the Apache2 license. • We now have an office in Japan
- 4. Why would you want to use Couchbase Mobile? Will your app work when the network is slow or only sometimes connected? ?
- 5. We think our network is fast, but .. • On trains or underground • Large crowds • Out of the city center • Deployed on sites which have unreliable Wifi • Sometimes you are completely offline • Etc ..
- 6. The simplest use case — sending a tweet on the subway Users expect better than this!
- 7. Our solution - Sync
- 8. Your app reads/writes to a local database This will be fast even if the network is slow or offline
- 9. Couchbase Lite sync’s the data to the cloud (can run in background)
- 10. TodoLite Demo • TodoLite is a todo list app • Users can login via Facebook • Users can share todo lists with each other • Different users can both view and update the same list • Photo attachments can be added to Todo items • Supports conflict resolution • Source code available on github (see resources slide) • Available in iTunes app store and Google Play
- 11. Understanding sync gateway • Sync Gateway can control which users can see which documents. • In effect, it can partition the database so that users only see a subset of the database
- 12. Partitioning a database by company and region
- 13. Using Sync Gateway to partition a database • Sync Gateway can do this efficiently • The main reason it was created • Sync Gateway uses “channels” to do this • Let’s walk through an example
- 14. Using Channels in OfficeRadar Example OfficeRadar uses iBeacons to detect who is in the office
- 15. Users should only see activity for other users in their organization
- 16. Sync Function • The sync function partitions the database by putting documents into channels • To understand the sync function, we must look at the OfficeRadar documents
- 17. OfficeRadar GeofenceEvent Document Each Geofence Event is associated with an organization { "_id":"!QJoBU7cRa~m2E2tYloSHHN", "_rev":"1-8e8f3cebf357a2546c0d40e497227115", "action":"entry", "beacon":"4a83813db6ce76e9618793cf483cfa10", "created_at":"2014-08-28T23:43:19.119Z", "userprofile":"10152586863333982", "type":"geofence_event", "organization":"couchbase" }
- 18. OfficeRadar UserProfile Document Each User Profile is associated with an organization { "_id":"10152586863333982", "_rev":"1-2b6a6e182ef77cd15db7171023931e8d", "type":"profile", "authSystem":"facebook", "name":"Traun Leyden", "organization":"couchbase" }
- 19. OfficeRadar Sync Function function(doc, oldDoc) { if (doc.type == "geofence_event") { channel(doc.organization); } else if (doc.type == "profile") { access(doc.userid, doc.organization); } }
- 20. Adding a geofence event to a channel if (doc.type == "geofence_event") { channel(doc.organization); }
- 21. Allowing a user to access an organization’s channel else if (doc.type == "profile") { access(doc.userid, doc.organization); }
- 22. Views Putting the “No” in NoSQL • Map/Reduce mechanism - A standard method of indexing in NoSQL - A view is similar to index in relational database. • App-defined map function - Called on every document - Can emit arbitrary key/value pairs into the index • Optional reduce function - Data aggregation / grouping • Functions are registered as native callbacks - Native callbacks make sense for performance and to match the rest of the app codebase
- 23. Queries • Basic feature set - Key ranges, offset/limit, reverse, group by key… - No joins or fancy sorting - but compound keys (and clever emits) allow for some tricks • LiveQuery subclass - Monitors a view for changes - Can think of it as a “pub-sub” approach - Register a callback that is triggered when the query changes
- 24. Use Cases
- 25. Embedded Picsolve Image capture of roller coaster riders to local database in multiple theme park locations Machine to machine communication example Unreliable network connectivity required offline capture / later sync to centralized management system
- 26. Infinite Campus Education / Social Interaction Selectively push out learning modules / multimedia lessons to individual students Teachers and students use custom mobile chat apps for real-time Q&A during lectures Homework assignments can be completed offline anywhere
- 27. Offline Sensor Data A weather balloon could collect sensor data while offline and sync it whenever it is online
- 28. Travel Expense Tracker • I am in Tokyo, but my iPhone 5 is locked so I cannot use a local SIM card. • But I need an app to track my expenses, so I must be able to enter expenses while offline. • When I get back to the US, I want to sync these expenses to the Cloud so I can download a spreadsheet.
- 29. Resources • These slides will be made available on SlideShare • Sample code links • https://github.com/couchbaselabs/ToDoLite-Android • https://github.com/couchbaselabs/ToDoLite-iOS • https://github.com/tleyden/office-radar • Documentation • http://developer.couchbase.com/mobile • Download - http://mobile.couchbase.com • Contact: [email protected]
- 30. Resources 2 • Couchbase Mobile Google Group (community): groups.google.com/group/mobile-couchbase/ • Couchbase Mobile Twitter: https://twitter.com/CouchbaseMobile • Run Sync Gateway (and Couchbase Server!) under Docker: http://tleyden.github.io/blog/2014/06/22/running-couchbase- sync-gateway-on-gce/
- 31. Upcoming Event: Hackathon • http://couchbasejpcommunity.doorkeeper.jp/events/13988
- 32. Upcoming Event: Couchbase Server • Couchbase Server http://couchbasejpcommunity.doorkeeper.jp/events/14785
- 33. Thanks for watching! Contact: [email protected] Questions?