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

Run your web apps
on Google’s infrastructure

source: nytimes.com (June 8 2006)

Google datacenter
The Dalles, Oregon

Infrastructure as a Service
Platform as a Service
Software as a Service

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

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

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

source: google.com

April 2008

April 2009

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

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

on
Other JVM languages:

+

+
source: infoq.com

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

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

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

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

App Engine dashboard

App Engine dashboard

Demo

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

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

Questions?

Thank you