Presentación de Hector Zarate (@iOSCowboy) sobre las practicas de desarrollo iOS en Spotify

1. January 20, 2015
Hector Zarate Rea (@iOSCowboy)
From Plan to Done
(iOS Client)

2. Spotify in Numbers
• Over 60 million active users.
• Over 30 million songs.
• 20,000 songs added per day.
• Over 1.5 billion playlists created so far.
• Available in 58 markets

3. Our iOS Client in Numbers
40
Contributors each month
Millions
User Base
500,000
Lines of code

4. Repository Contributors in Numbers
0
12,5
25
37,5
50

5. S C ALE

6. P R OBL E M S

7. PROBLEM 1: Feature Branches

8. master
Feature Branches

9. master
Feature Branches
feature_a

10. master
Feature Branches
feature_a
feature_b

11. master
Feature Branches
feature_a
feature_b
feature_c

12. master
Feature Branches
feature_a
feature_b
feature_c
x
x

13. Branches Merged Back Into Master
70%
30%

14. SOLUTION 1: AB Rollout
master

15. SOLUTION 1: AB Rollout
master (feature_a, feature_b, feature-c)

16. SOLUTION 1: AB Rollout
A B

17. SOLUTION 1: AB Rollout
A B

18. Branches Merged Back Into Master
10%
90%

19. PROBLEM 2: Merge Conflicts (Lots of ‘em)
Spotify.xcodeproj

20. PROBLEM 2: Merge Conflicts (Lots of ‘em)

21. PROBLEM 2: Merge Conflicts (Lots of ‘em)
+x x

22. PROBLEM 2: Merge Conflicts (Lots of ‘em)
Spotify.xcodeproj

23. PROBLEM 2: Merge Conflicts (Lots of ‘em)
Radio Browse Social
Discover
Music
Player
X

24. GAME STRATEGY

25. 1. Agile - Flavored Process
Plan Work Done

26. 1. Agile - Flavored Process
Plan Work Done

28. ◕ ◡ ◕

29. ◕ ◡ ◕
2. Version Control

30. ◕ ◡ ◕
2. Version Control

31. 3. Code Reviews
◕ ◡ ◕

32. 3. Code Reviews
ಠ _ ಠ ◕ ◡ ◕

33. 3. Code Reviews
ಠ _ ಠ ◕ _ ◕

34. 3. Code Reviews
ಠ ◡ ಠ ◕ _ ◕

35. 3. Code Reviews
ಠ ◡ ಠ ◕ ◡ ◕

36. 3. Code Reviews
• Spread Knowledge.
• Prevent work from being repeated.
• Opportunity to detect errors earlier.

37. feature

38. feature
3. Continuos Integration

39. 3. Continuos Integration
• Eases integration issues.
• Gives automatic notification of build and test errors and prints stats like code coverage.
• Gives clues of where and when things went wrong to everybody.
• Executes tests suites

41. 4. Unit Tests
1 2 3 4

42. 4. Unit Tests
1 2 3 4 5

43. 4. Unit Tests
1 2 3 4 5 6

44. 4. Unit Tests
• Used mainly to test model and model-view layers of the client.
• First channel of feedback to avoid regressions.
• Can be executed on the developer machine as well.

45. 5. Automated Tests

46. 5. Automated Tests

51. 5. Automated Tests
• Used mainly to test the view layer and user interfaces of the app.
• Executed on all supported devices.

52. master

53. 6. Log Crashes

54. January 20, 2015
Questions!

55. January 20, 2015
Thank you!

56. January 20, 2015
Keep in touch
hector@spotify.com
@iOSCowboy
iOSCowboy.com