The document discusses building offline-first applications using Couchbase Lite for Android, highlighting features like document saving, synchronization, and conflict resolution. It explains the internal processes involved in data handling and replication, as well as potential use cases and benefits such as performance and robustness. Additional resources and a GitHub link for a sample project are provided at the end.

1. Let’s
build
offline-­‐first
apps!
James
Nocentini
|
Developer
Advocate,
Couchbase

2. ©2014
Couchbase
Inc.
Use
case
2
• Clean
UI
• The
user
shouldn’t
have
to
be
online
@jamiltz

3. No
loading,
no
waiting,
nothing.

4. ©2014
Couchbase
Inc.
Options
4
@jamiltz

5. ©2014
Couchbase
Inc.
Options
5
@jamiltz

6. 6
Sync
Gateway Couchbase
Server

7. ©2014
Couchbase
Inc.
Couchbase
Lite
7
Today
I’d
like
to
talk
about
some
of
the
internals
of
Couchbase
Lite
Android
@jamiltz

8. ©2014
Couchbase
Inc.
Saving
a
document
8
Map<String, Object> properties = new HashMap<String, Object>();
properties.put("type", "list");
properties.put("title", title);
properties.put("created_at", currentTimeString);
properties.put("owner", "profile:" + userId);
properties.put("members", new ArrayList<String>());
// save to database
Document document = database.createDocument();
document.putProperties(properties);
@jamiltz

9. ©2014
Couchbase
Inc.
Saving
a
document
9
Document document = database.getDocument(myDocId);
String title = document.getProperty("title");
Map<String, Object> properties = doc.getProperties();
String owner = (String) properties.get("owner");
@jamiltz

10. ©2014
Couchbase
Inc.
Saving
a
document
10
Document document = database.getDocument(myDocId);
String title = document.getProperty("title");
Map<String, Object> properties = doc.getProperties();
String owner = (String) properties.get("owner");
@jamiltz

11. Plain
Old
Java
Objects

12. Plain
Old
JSON
Objects

13. ©2014
Couchbase
Inc.
It’s
JSON
{
"_id": "123",
"type": "list",
"title": "TodoMVC list",
"owner": "1234567890",
"members": [
"0987654321",
"0192837465"
]
}
13
@jamiltz

14. ©2014
Couchbase
Inc.
Content
Types
JSON ❤ HTTP
14
@jamiltz

15. ©2014
Couchbase
Inc.
What
else?
15
Replicators
@jamiltz

16. ©2014
Couchbase
Inc.
Two
Verbs
Push
→
Pull
←
16
@jamiltz

17. ©2014
Couchbase
Inc.
Two
Verbs
Push
→
Server
Pull
←
Server
17
@jamiltz

18. ©2014
Couchbase
Inc.
Two
Verbs
Push
→
Couchbase
Sync
Gateway
Pull
←
Couchbase
Sync
Gateway
18
@jamiltz

19. ©2014
Couchbase
Inc.
Push
19
facebookAuthenticator = AuthenticatorFactory.createFacebookAuthenticator(accessToken);
Replication push = database.createPushReplication(SYNC_URL);
push.setAuthenticator(facebookAuthenticator);
push.setContinuous(true);
push.start();

20. ©2014
Couchbase
Inc.
If
you
were
to
build
your
own
▪ Create
a
job
object
that
has
an
action
▪ Write
data
to
a
durable
queue
▪ Run
a
service
to
process
the
queue
▪ The
service
retries
if
the
network
hiccups
or
app
crashes
▪ Remove
from
the
queue
once
the
job
is
complete
20
@jamiltz

21. ©2014
Couchbase
Inc.
Replicators
21
Source Target
Android
App Sync
Gateway
@jamiltz

22. ©2014
Couchbase
Inc.
Replicators
Get
the
sequence
ID
of
the
source
database
22
@jamiltz

23. ©2014
Couchbase
Inc.
Replicators
23
Source Target
Android
App Sync
Gateway
@jamiltz
seq:
15 seq:
5

24. ©2014
Couchbase
Inc.
Pull
Pull
==
24
Push
@jamiltz

25. ©2014
Couchbase
Inc.
Replicators
25
Source
Android
App Sync
Gateway
@jamiltz
Target

26. ©2014
Couchbase
Inc.
Replicators
26
Source
Android
App Sync
Gateway
@jamiltz
Target
seq:
15seq:
5

27. ©2014
Couchbase
Inc.
Pull
27
facebookAuthenticator = AuthenticatorFactory.createFacebookAuthenticator(accessToken);
Replication pull = database.createPullReplication(SYNC_URL);
pull.setAuthenticator(facebookAuthenticator);
pull.setContinuous(true);
pull.start();

28. Demo

29. Don’t
drain
all
my
battery!

30. ©2014
Couchbase
Inc.
Pull
30
facebookAuthenticator = AuthenticatorFactory.createFacebookAuthenticator(accessToken);
Replication pull = database.createPullReplication(SYNC_URL);
pull.setAuthenticator(facebookAuthenticator);
pull.setContinuous(true);
pull.start();

31. ©2014
Couchbase
Inc.
Solution
GCM
is
your
friend
🎉
31
@jamiltz

32. ©2014
Couchbase
Inc.
Data
Flow
Techniques
32
Sync
Gateway
changes
feed
Push
notifications
worker
Continuous
push
@jamiltz

33. ©2014
Couchbase
Inc.
Data
Flow
Techniques
33
Sync
Gateway
changes
feed
Push
notifications
worker
Continuous
push
GCM
notification
GCM
notification
@jamiltz

34. ©2014
Couchbase
Inc.
Data
Flow
Techniques
34
Sync
Gateway
changes
feed
Push
notifications
worker
Continuous
push
One
shot
pull
One
shot
pull
@jamiltz

35. Demo

36. ©2014
Couchbase
Inc.
Conflict
resolution
36
rev-­‐1
rev-­‐2
rev-­‐1
rev-­‐2’
@jamiltz

37. ©2014
Couchbase
Inc.
Conflict
resolution
37
rev-­‐1
rev-­‐2 rev-­‐2’

38. ©2014
Couchbase
Inc.
Conflict
resolution
38
rev-­‐1
rev-­‐2 rev-­‐2’
current
revision

39. ©2014
Couchbase
Inc.
Conflict
resolution
39
rev-­‐1
rev-­‐2 rev-­‐2’

40. ©2014
Couchbase
Inc.
Conflict
resolution
40
rev-­‐1
rev-­‐2
current
revision

41. P2P Demo

42. ©2014
Couchbase
Inc.
CouchbaseLite
Listener
42
Embedded
lightweight
HTTP
server

43. ©2014
Couchbase
Inc.
Replications
43
Same
Replication
Interface
as
Sync
Gateway

44. ©2014
Couchbase
Inc.
Mesh
Networks
44

45. Workshops
• Push
/
Pull
• Basic
config
for
Sync
Gateway
• And
more…

46. ©2014
Couchbase
Inc.
Summary
▪ Performance
▪ Ease
of
development
▪ Live
Queries
▪ Robustness
46

47. ©2014
Couchbase
Inc.
More
Information
47
James
Nocentini
Developer
Advocate
@jamiltz
ToDoLite
Android
https://github.com/couchbaselabs/ToDoLite-­‐Android
Couchbase
Developer
Forums
http://forums.couchbase.com