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echo-o & Google App Engine dev - BarCamp Saigon 1
 

echo-o & Google App Engine dev - BarCamp Saigon 1

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For BarCamp Saigon 1, Multinc describes their experiences developing http://echo-o.com on top of the Google App Engine platform

For BarCamp Saigon 1, Multinc describes their experiences developing http://echo-o.com on top of the Google App Engine platform

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    echo-o & Google App Engine dev - BarCamp Saigon 1 echo-o & Google App Engine dev - BarCamp Saigon 1 Presentation Transcript

    • by Tien Loi Nguyen @ Multinc with guidance from Huy Zing BarCamp Saigon 1 November 15, 2008
    • echo-o
      • The features of echo-o Application:
        • Index page
        • Speaker page
        • Audience page
        • Moderator page
    • echo-o
      • Index page:
    • echo-o
      • Graph in speaker page:
    • echo-o
      • Audience page:
    • echo-o
      • Moderator page:
    • Google app engine
      • Google App Engine lets you run your web applications on Google's infrastructure
      • easy to start
      • easy to scale
    • Prepare for developing app engine applications
      • python 2.5 ( http://www.python.org/download/ )
      • google app engine SDK ( http://code.google.com/appengine/downloads.html )
    • Hello World
      • Create a configuration file called “app.yaml”
    • Hello World
      • Create a script file called “helloworld.py”
    • Hello World
      • Run the application at localhost:
      • Upload your application to google app engine:
    • Some notices
      • Cannot join the tables(models)
      • Cannot get more than 1000 results from a database
      • Inequality filters are allowed on one property only
      • Properties in inequality filters must be sorted before other sort orders
      • GQL does not have an OR operator, but it has an IN operator
    • Problems we ran into
      • Server error
    • Problems we ran into
      • Limited CPU quota
    • Problems we ran into
      • Problem: How to detect how many audiences are still alive
      • Solution: Polling request every few seconds
    • http://multinc.com/ http://code.google.com/appengine/