Firebase Realtime Database

Slides from my talk on Firebase Realtime Database at Droidcon India 2016

Transcript

1. Firebase Realtime Database Soham Mondal
2. @s0h4m soham@triveous.com — Founder, Triveous — Creator, Voice Recorder — Google Expert, UX — Android/UX consultant — Organizer, Blrdroid — Mentor, Google Launchpad Accelerator Soham Mondal
3. Firebase Realtime Database Agenda Introduction API Caveats and Alternatives — Introduction to the Firebase platform — Firebase Realtime Database — Realtime challenges — Use Case — Feature set — Getting Started — Read — Write — Value Event Listeners vs Child Event Listeners — Offline — Data structure — Query — Realtime + Admin API — Design patterns — Alternatives — Realm Mobile Platform/CouchDB/Others
4. Firebase Mobile and web applications platform http://firebase.google.com
5. Firebase Realtime Database
6. Book movies and pay onling Book Browse the latest movies Browse People should not stop using the app and keep using it do bookings Retention Increase engagement in consumers so they spend more time in the app Engagement
7. Realtime features
8. Realtime Chat Talk to your friends and discuss the latest movies Realtime polling Poll on viewing the latest movies, the theatre, timing or even genre
9. Updated Movie App Higher Engagement Retention Competitive Edge Benefits Book movies and pay onling Book Browse the latest movies Browse Poll on movies, shows and timings Poll Talk about the latest movies Talk
10. — Server — Database — Realtime Updates — Synchronizing state — Client and server libraries — Offline The Realtime Collaborative Movie App
11. Firebase Realtime Database — Hosted Json Database — Realtime Updates — Google Cloud — Scalable — Consistency — Offline — Speed — Good pricing — Cross platform support — Admin API — Firebase UI 11
12. Getting started Firebase Realtime Database
13. apply plugin: 'com.android.application' dependencies { // ... compile 'com.google.firebase:firebase-core:9.8.0' compile 'com.google.firebase:firebase-database:9.8.0' } apply plugin: 'com.google.gms.google-services'
14. FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference("message"); myRef.setValue("Hello, Movie Booking app!");
15. Read Data Value and Child Event Listeners
16. FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference("message");
17. FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference("message"); myRef.addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { } @Override public void onCancelled(DatabaseError error) { } });
18. FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference("message"); myRef.addListenerForSingleValueEvent()
19. ChildEventListener childEventListener = new ChildEventListener() { @Override public void onChildAdded(DataSnapshot dataSnapshot, String previousChildName) {} @Override public void onChildChanged(DataSnapshot dataSnapshot, String previousChildName) {} @Override public void onChildRemoved(DataSnapshot dataSnapshot) { } @Override public void onChildMoved(DataSnapshot dataSnapshot, String previousChildName) {} @Override public void onCancelled(DatabaseError databaseError) {} }; myRef.addChildEventListener(childEventListener);
20. Query
21. Query chatMessages = databaseReference.child(”chats") .orderByChild(”timestamp"); chatMessages.addChildEventListener(new ChildEventListener() { });
22. Offline Read and Write data
23. FirebaseDatabase.getInstance().setPersistenceEnabled(true);
24. DatabaseReference chatRef = FirebaseDatabase.getInstance() .getReference(”chat"); chatRef.keepSynced(true);
25. DatabaseReference chatRef = FirebaseDatabase.getInstance() .getReference(”chat"); chatRef.keepSynced(true); scoresRef.orderByValue().limitToLast(4) .addChildEventListener(new ChildEventListener() { @Override public void onChildAdded(DataSnapshot snapshot, String previousChild) { } });
26. Caveats
27. Structuring Data SQL vs NoSQL
28. https://highlyscalable.wordpress.com/2012/03/01/nosql-data-modeling-techniques/
29. { "chats": { "one": { "title": ”Soham Mondal", "messages": { "m1": { "sender": ”Soham", " Yes, let us definitely go ahead and book this otherwise…" }, "m2": { ... }, // a very long list of messages } }, "two": { ... } } }
30. { "chats": { "one": { "title": ”Soham Mondal", "lastMessage": ”Yes, let us definitely go ahead and book this otherwise…", ”imageUrl": ”...", "timestamp": 1459361875666 }, "two": { ... }, "three": { ... } }, "members": { "one": { ”nidhi": true,
31. "two": { ... }, "three": { ... } }, "messages": { "one": { "m1": { "name": ”soham", "message": ”ok what was that movie again", "timestamp": 1459361875337 }, "m2": { ... }, "m3": { ... } }, "two": { ... }, "three": { ... } } }
32. Does it sync in the background? 32
33. START 2:15 pm App Open Send Message App goes into the background 3:00 pm App open New Message
34. START 2:15 pm App Open Send Message App goes into the background 3:00 pm App open New Message
35. START 2:15 pm App Open Send Message App goes into the background 3:00 pm App open New Message
36. Admin SDK
38. Server sdk
39. Caveats — Good but inflexible API — Search Query — Server side code — Migration — Limited use case — Play Services — Hosted
40. Design patterns Architecture
41. Auxilliary Auxilliary Customer support Troubleshooting Core Core Features Chat application Cab booking service Module Modular Features Chat Polls, interaction
42. Alternatives
43. Very popular with developers Launched recently Good offline db Excellent API Realm Open souce Reliable Android solution? Couch RethinkDB Gun Others Alternatives
44. Altenatives Realm Mobile Platform Object database Native models Easy to use Great client side performance Better offline experience Built in encryption Advantages
45. Thank You Questions? @s0h4m
46. Links: https://firebase.google.com/ https://highlyscalable.wordpress.com/2 012/03/01/nosql-data-modeling- techniques/ https://realm.io/