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

Nov 19, 2008Download as PPT, PDF1 like443 views

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

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

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 Problem: How to detect how many audiences are still alive Solution: Polling request every few seconds

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

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

1. by Tien Loi Nguyen @ Multinc with guidance from Huy Zing BarCamp Saigon 1 November 15, 2008

2. echo-o The features of echo-o Application: Index page Speaker page Audience page Moderator page

3. echo-o Index page:

4. echo-o Graph in speaker page:

5. echo-o Audience page:

6. echo-o Moderator page:

7. Google app engine Google App Engine lets you run your web applications on Google's infrastructure easy to start easy to scale

8. 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 )

9. Hello World Create a configuration file called “app.yaml”

10. Hello World Create a script file called “helloworld.py”

11. Hello World Run the application at localhost: Upload your application to google app engine:

12. 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

13. Problems we ran into Server error

14. Problems we ran into Limited CPU quota

15. Problems we ran into Problem: How to detect how many audiences are still alive Solution: Polling request every few seconds

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

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

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