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An Introduction to the Google App Engine
- 1. Google Technology User Group #4 An Introduction to the Google App Engine by George Holler 17 November 2010
- 2. The Google App Engine ScalableScalable CostCost PlatformPlatform For building web apps in the cloud Automatic scaling and load balancing Pay for what is used, with limits you set CodeCode In Python or Java SDKSDK Local development environment APIsAPIs Google APIs for web programming
- 3. Architecture
- 4. Sandbox – What you can do
- 5. Sandbox – What you can't do
- 6. APIs... Datastore API Interface to save and retrieve data Memcache API High performance in-memory key-value cache Mail API Send and receive emails URL Fetch API Access web resources Users API Interface with Google Accounts Images API Interface to manipulate images (jpg, png) Blobstore API Interface for saving large binary data XMPP API Interface for Instant Messaging Task Queue API Interface to enqueue tasks for app (exp) Namespaces API Multitenancy OAuth API Third party authentication (exp) Mapper API For MapReduce (exp)
- 11. Google App Engine Dashboard
- 12. Google App Engine Dashboard
- 13. System Status
- 14. App Engine Hard Limits Apps per developer 10 Time per request 30 sec Blobstore size (Total file size per app) 2GB HTTP request size 10 MB HTTP response size 10 MB Datastore item size 1 MB Number of files (app and static files) 3000 Size of any static or app file 10 MB Application code size 150 MB Number of values in an index for an entity 5000 Number of entities returned in a query at a time 1000 Number of entities in a batch put or delete 500
- 15. App Engine Tools
- 16. Resources GAE Dashboard: http://appengine.google.com GAE Docs: http://code.google.com/appengine/docs/ System Status: http://code.google.com/status/appengine My Blog: http://georgeholler.wordpress.com My Email: georgeholler @ gmail.com
- 17. ood Bye!
Hinweis der Redaktion
- helps productivity and maintainability — it's easy to create UI from scratch or copy/paste across templates; makes it easier to collaborate with UI designers who are more comfortable with XML, HTML and CSS than Java source code; provides a gradual transition during development from HTML mocks to real, interactive UI; encourages a clean separation of the aesthetics of your UI (a declarative XML template) from its programmatic behavior (a Java class); performs thorough compile-time checking of cross-references from Java source to XML and vice-versa; offers direct support for internationalization that works well with GWT's i18n facility; and encourages more efficient use of browser resources by making it convenient to use lightweight HTML elements rather than heavier-weight widgets and panels