Google App Engine is a platform as a service that allows users to build and host web applications on Google's infrastructure. It provides the computing platform including operating system, scaling and maintenance. Developers write apps using Google-supported languages like Java and Python and App Engine handles everything required to run and scale those apps. It also includes several Google APIs to use services like datastore, mail and images. Users pay only for the resources their app uses on a per-request basis with free usage quotas.

1. Google App Engine
Sean Sullivan
SAO cloud computing event
September 17, 2009

2. Run your web apps
on Google’s infrastructure

3. source: nytimes.com (June 8 2006)

4. Google datacenter
The Dalles, Oregon

5. Infrastructure as a Service
Platform as a Service
Software as a Service

6. http://code.google.com/appengine/

7. Pricing and quotas
• free to start
• pay as you go
• billable resources
• quotas

8. Billable resources
• Requests • XMPP
• Datastore • Image manipulation
• Mail • Memcache
• URL Fetch • Deployments

9. source: google.com

11. April 2008

12. April 2009

13. • Memcache • Data Store
• URL Fetch • Google Accounts
• Mail • Task Queue
• Images • XMPP

14. on
• Google provides JVM and servlet container
• Java 6 JRE
• Servlet 2.5 API
• whitelisted classes

15. on
Other JVM languages:

16. +

17. +
source: infoq.com

18. App Engine Java API’s
• com.google.appengine.api.memcache
• com.google.appengine.api.urlfetch
• com.google.appengine.api.users
• com.google.appengine.api.xmpp

19. App Engine Java API’s
• com.google.appengine.api.images
• com.google.appengine.api.labs.taskqueue
• com.google.appengine.api.mail
• com.google.appengine.api.datastore

20. Datastore programming
Supported: Not supported:
• JPA • JDBC
• JDO • SQL
• Google datastore API

21. App Engine limitations
• HTTP and HTTPS
• HTTP requests limited to 30 seconds
• no server push
• no long-running background processes
• no threads

25. App Engine dashboard

26. App Engine dashboard

27. Demo

30. Telephony in the cloud
http://www.twilio.com

31. Telephony in the cloud
+
http://code.google.com/p/twilio-java-client

32. Questions?

33. Thank you