What do you mean, backwards compatibility?

1. #GeeCON What do you mean, backwards compatibility? Trisha Gee • Java Driver Developer, 10gen • @trisha_gee

2. Design: translate the requirements in a specification that describes the global architecture and the functionality of the system. http://homepages.cwi.nl/~paulk/patents/isnot/node4.html

3. Managing the Development of Large Software Systems - Dr Winston Royce http://www.cs.umd.edu/class/spring2003/cmsc838p/Process/waterfall.pdf

4. <This Page Left Intentionally Blank> Agile Design

5. Design is a Process, not a Document

6. What are you saying? • Design is a journey, enjoy the ride • There will be Monsters • There will be Safe Houses • There might not even be a destination...

7. Best Job Evar!!

8. We’re off!

9. Backward Compatibility

10. Lots of unknowns

11. Design Goals

12. Yes, it’s a document

13. Design Goals • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

14. Lack of consistency

15. Coding Standards

16. Zero Analysis Errors

17. No more arguments

18. Design Goals • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

19. Users

20. Identify Our Users

21. Three Types Of Users • Java Developers • ODMs / other drivers / third parties • Contributors

22. Java Developers • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

23. Third Party Libraries • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

24. Contributors • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

25. Users are our friends

26. Backward Compatibility

27. Architecture

28. UML, yuk!

29. High Level Architecture

30. Scala Driver

31. Design Goals • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

32. Design Goals • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

33. High Level Architecture

34. Option 1: Wrapping

35. Option 2: Connecting

36. Backward Compatibility?

37. Tests Pass

38. We win!

39. Design Goals • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

40. Not Dead Yet...

41. The Public API

42. Design Goals • Consistency • Cleaner design • Intuitive API • Sane Exception handling • Test friendly • Backwards compatible

43. Caveats • It won’t look like this • Haven’t decided consistent names yet • Need something that suits all drivers

44. Find • collection.find(query).skip(1000).limit(100); • collection.find(query).skip(1000).limit(100);

45. Find • collection.find(query).skip(1000).limit(100); • collection.find(query).skip(1000).limit(100); • collection.find(query, fields);

46. Which One?

47. Find • collection.find(query).skip(1000).limit(100); • collection.find(query).skip(1000).limit(100); • collection.find(query, fields); • collection.find(query).fields(fieldsToSelect);

48. Fewer Decisions

49. “Cmd + space” friendly

50. Find • collection.find(query).skip(1000).limit(100); • collection.find(query).skip(1000).limit(100); • collection.find(query, fields); • collection.find(query).select(fields);