The document discusses using Google App Engine for cloud hosting applications, highlighting its simplicity, automatic scaling, and lack of systems administration. It covers the purpose and structure of Google Data APIs, including REST principles and protocol for resource management. Examples of CRUD operations and other functionalities of the Google Data Protocol are provided to illustrate its applications.

1. Living In The Cloud Hosting Data & Apps Using The Google Infrastructure

2. Introductions Pamela Fox USC Google MS/BS CS

3. Introductions http://www.wordle.net/gallery/wrdl/710650/fkedupmonkey_tags

4. The Cloud!

5. Tonight’s Agenda Google Data APIs App Engine

6. Before the Cloud: Web Apps

7. After the Cloud: Web Apps

8. Viral Spread Simultaneous Edits = Scaling Nightmare Mo’ Users, Mo’ Problems

9. Solution: App Engine

10. What Is App Engine? Lets you run your web application on top of Google’s infrastructure. Servers Network Datastore Backups Pagers Scalable }

11. Why App Engine “ We wear pagers so you don’t have to.” — Guido van Rossum

12. Simplicity App Engine is designed to be simple. Simple application configuration. No systems administration. No performance tuning. Automatic scaling.

13. App Engine Architecture code data

14. Non-Scalable Architecture code/data

15. Python

16. Data Store

17. 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)

18. Memcache

19. Users @gmail.com @myappsdomain.com

20. Demo Google App Engine

21. Before the Cloud: User Apps

22. Before the Cloud: User Apps

23. Users demand ownership of their content. Other sites want to access that content. Damn Needy Users

24. Solution: Google data APIs

25. How Do You Make Things Accessible? A pplication P rogramming I nterface ( )

26. APIs An application programming interface (API) is a set of functions, procedures, methods or classes that an operating system , library or service provides to support requests made by computer programs . Source: Wikipedia C/C++ Header File

27. APIs RPC || REST * SOAP

28. 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++

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

30. REST Fundamentals of REST: Application state and functionality is abstracted into discrete resources .

31. REST Fundamentals of REST: Resources are accessible via URLs . /blog/posts/1234

32. REST Fundamentals of REST: Resources share a uniform interface for transferring state . HTTP:// } GET POST PUT DELETE

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

34. ATOMPub Feed { Entries

35. Google data APIs Protocol Feed Query { Entries

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

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

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

39. Case Study: CalGoo

40. The Google Data Protocol GET /myFeed 200 OK <?xml version=&quot;1.0&quot;?> <feed xmlns=&quot; http://www.w3.org/2005/Atom &quot;> <title>Foo</title> <updated>2006-01-23T16:25:00-08:00</updated> <id> http://www.example.com/myFeed </id> <author> <name>Jo March</name> </author> <link href=&quot;/myFeed&quot; rel=&quot;self&quot;/> </feed> Requesting a feed or resource

41. The Google Data Protocol POST /myFeed <?xml version=&quot;1.0&quot;?> <entry xmlns=&quot; http://www.w3.org/2005/Atom &quot;> <author> <name>Elizabeth Bennet</name> <email> [email_address] </email> </author> <title type=&quot;text&quot;>Entry 1</title> <content type=&quot;text&quot;>This is my entry</content> </entry> Creating a new resource

42. The Google Data Protocol 201 CREATED <?xml version=&quot;1.0&quot;?> <entry xmlns=&quot; http://www.w3.org/2005/Atom &quot;> <id> http://www.example.com/id/1 </id> <link rel=&quot;edit&quot; href=&quot; http://example.com/myFeed/1/1/ &quot;/> <updated>2006-01-23T16:26:03-08:00</updated> <author> <name>Elizabeth Bennet</name> <email> [email_address] </email> </author> <title type=&quot;text&quot;>Entry 1</title> <content type=&quot;text&quot;>This is my entry</content> </entry> Creating a new resource

43. The Google Data Protocol PUT /myFeed/1/1/ <?xml version=&quot;1.0&quot;?> <entry xmlns=&quot; http://www.w3.org/2005/Atom &quot;> <id> http://www.example.com/id/1 </id> <link rel=&quot;edit&quot; href=&quot; http://example.com/myFeed/1/1/ &quot;/> <updated>2006-01-23T16:28:05-08:00</updated> <author> <name>Elizabeth Bennet</name> <email> [email_address] </email> </author> <title type=&quot;text&quot;>Entry 1</title> <content type=&quot;text&quot;>This is my first entry.</content> </entry> Updating an entry

44. The Google Data Protocol 200 OK <?xml version=&quot;1.0&quot;?> <entry xmlns=&quot; http://www.w3.org/2005/Atom &quot;> <id> http://www.example.com/id/1 </id> <link rel=&quot;edit&quot; href=&quot; http://example.com/myFeed/1/2/ &quot;/> <updated>2006-01-23T16:28:05-08:00</updated> <author> <name>Elizabeth Bennet</name> <email> [email_address] </email> </author> <title type=&quot;text&quot;>Entry 1</title> <content type=&quot;text&quot;>This is my first entry.</content> </entry> Updating an entry

45. The Google Data Protocol DELETE /myFeed/1/2/ 200 OK Updating an entry

46. Demo Google Data CRUD

47. The Google Data Protocol GET /myFeed?q=This 200 OK <?xml version=&quot;1.0&quot;?> <feed xmlns=&quot; http://www.w3.org/2005/Atom &quot;> <title>Foo</title> <updated>2006-01-23T16:26:03-08:00</updated> <id> http://www.example.com/myFeed </id> <link href=&quot;/myFeed&quot; rel=&quot;self&quot;/> <entry> <id> http://www.example.com/id/1 </id> <link rel=&quot;edit&quot; href=&quot; http://example.com/myFeed/1/1/ &quot;/> <updated>2006-01-23T16:26:03-08:00</updated> <title type=&quot;text&quot;>Entry 1</title> <content type=&quot;text&quot;>This is my entry</content> </entry> </feed> Searching for a resource

48. Demo Youtube Searcher

49. JSON and RSS Other formats are also supported: ?alt=json ?alt=json-in-script ?alt=kml ?alt=rss http://code.google.com/apis/gdata/json.html

50. Client Libraries PHP .NET Java JavaScript Objective-C Python + Community Contributed

51. Demo Google Data Sample Applications

52. My Secret Motivation For Giving This Talk Google Data APIs ♥ App Engine

53. Demo Google Data APIs + App Engine

54. Questions?

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