1. LOGO OFFLINE Web Applications Google Gears Jia Liu jl3032@columbia.edu

2. www.themegallery.comCompany Logo From Online to Offline  Online applications are Great  Offline are also Necessary Internet unavailable? Don’t want the data in the clouds? Response time?  Fill the gaps between online and offline

3. www.themegallery.comCompany Logo Browser Text Server Database HTTP Architecture

4. www.themegallery.comCompany Logo Browser Text Server Database Install Architecture Local Server Data base

5. www.themegallery.comCompany Logo Browser Text Server Database Architecture Local Server Data base

6. www.themegallery.comCompany Logo Offline Tools  In the past Dojo Storage, Derby/JavaDB, Zimbra  Today Adobe AIR Google Gears Microsoft Silverlight  Coming Soon FireFox 3 HTML5 Working Draft Client-side database storage

7. www.themegallery.comCompany Logo Google Gears  What is Google Gears? Brower-plugin Open source library http://gears.google.com  Cost Open Source Lightweight installation necessary Application stays completely in the browser, no extra app/start up

8. www.themegallery.comCompany Logo Components Local Sever Let web applications interact naturally with your desktop Database Store data locally in a fully-searchable database WorkerPool Run JavaScript in the background to improve performance

9. www.themegallery.comCompany Logo LocalServer  Specialized URL Cache Requests for URLs in the LocalServer’s cache are intercepted and served locally from the user’s disk  RecourseStore (Manual Update) ManagedResourceStore (Automatic Update)  Manifest File

10. www.themegallery.comCompany Logo DataBase  Open source SQLite Database  Simplified SQL Syntax  Full-text Search

11. www.themegallery.comCompany Logo Workerpool  Time-intensive processes can be run in the background UI stays responsive/browser doesn ’ t block No warning dialog “ Unresponsive Script ”

12. www.themegallery.comCompany Logo Syncing  Globally Unique ID  Timestamps  When Collisions Last one wins Lock/Check out Let user decide

13. www.themegallery.comCompany Logo Example

14. www.themegallery.comCompany Logo Example

15. www.themegallery.comCompany Logo Applications Gmail Calendar Maps SpreadSheet Reader Google Gears Docs

16. www.themegallery.comCompany Logo Applications  Gmail, Calendar… Any Web applications that can store data enough locally to work offline will benefit from it.  Limitations Stock Trading Systems -Online connectivity is an absolute must

17. www.themegallery.comCompany Logo CONCLUSION  Google Gears allows Web application to run offline  It opens a lot of doors to developers looking to bridge the narrowing gap between desktop and web-based applications.

18. LOGO Jia Liu jl3032@columbia.edu