In the modern web, the user rules. Nearly every successful web app has to worry about scaling to an exponentially growing user base and giving those users multiple ways of interacting with their data. Pamela Fox, Maps API Support Engineer & Developer advocate, provides an overview of two technologies - Google App Engine and the Google Data APIs - that aim to make web development and data portability easier.

3. The Cloud!

5. Before the Cloud: Web Apps

6. After the Cloud: Web Apps

8. Old Architecture code/data

9. Old Architecture

10. Old Architecture

11. Old Architecture

12. Solution: App Engine

14. App Engine Architecture code data

15. Simple, Automatic Scaling

16. App Engine Components code data

17. Python

18. Data Store

19. Data Store db.GqlQuery(&quot;SELECT * FROM Shout &quot; &quot;WHERE who >= 'b ' AND who < ' c ' &quot; &quot;ORDER BY when DESC&quot;).fetch(100) query = Shout.all() query.order('-date') query.filter('who >=', 'b') query.filter('who <', ‘c') shouts = query.fetch(100)

20. Memcache

21. Users @gmail.com @myappsdomain.com

23. Before the Cloud: User Apps

24. After the Cloud: User Apps

26. Solution: Google data APIs

29. Remote Procedure Calls fooInstance->addNumbers(2, 3); <?xml version=&quot;1.0&quot;?><methodCall> <methodName>Foo.addNumbers</methodName> <params> <param> <value><int>2</int></value> <value><int>3</int></value> </param> </params></methodCall> fooInstance.addNumbers(2, 3); PHP XML (Network) C++

30. REST [Fielding 2000] Re presentational S tate T ransfer ( )

34. RSS/ATOM Feed { Entries Example RSS feed.

35. ATOMPub Feed { Entries GET POST PUT DELETE

36. Google data APIs Protocol Feed Query { Entries GET POST PUT DELETE

37. The Google Data Protocol REST Google Data Protocol RSS 2.0 Architecture Syndication Updates AtomPub Atom

38. The Google Data Protocol RSS 2.0 Atom(Pub) Google Data Syndication Format ✓ ✓ ✓ Queries ✓ Updates ✓ ✓ Optimistic Concurrency ✓ Authentication ✓

39. The Google Data Protocol Over 15 APIs, 1 Protocol Many Uses

40. Case Study: CalGoo

56. Questions? Pamela Fox [email_address] @pamelafox More Info http://code.google.com ↶