Automated Poll Rotation control flow |
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This chart illustrates the events, from top to bottom. For simplification, caching is implicit.
| Visitor's browser | Web Server | ViewsFlash Server |
| anywhere | main.big.com | vf.big.com |
| Goes to dynamic page http://main.big.com/sports.dyn, handled by the Web Server | ||
|
Constructs dynamic sports page which includes the embedded poll for "sports" place. Because it is first time on this page, there is no VFPOLLS cookie. Issue
http call: http://vf.big.com/ViewsFlash/servlet/viewsflash? |
||
| Returns HTML fragment for the voting form to main.big.com | ||
| Inserts HTML fragment with voting form into page and returns full page to visitor | ||
| Visitor sees page with embedded poll. Fills out poll and Submits voting form to vf.big.com | ||
| Tallies vote. Sends VFPOLLS cookie with domain "big.com" back to visitor, and redirects visitor browser to redisplay the original page http://main.big.com/sports.dyn | ||
| Visitor's browser quietly goes to http://main.big.com/sports.dyn again. | ||
|
Constructs dynamic page again. This time, there is a VFPOLLS cookie. Its contents indicate that the
current poll has not expired. Therefore, issues http call: |
||
| Returns HTML fragment with poll results display to main.big.com | ||
| Inserts HTML fragment with poll results display into page and returns full page to visitor. | ||
| Visitor sees the original sports page, but now sees the results instead of a voting form. | ||
|
... (a short time passes) ....
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||
| Later, visitor returns to this page. | ||
| Because the VFPOLLS cookie indicates poll has not expired yet, issue getresults http call to vf.big.com | ||
|
..(even more time passes; poll expires in the meantime)...
|
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| Visitor return to page | ||
| VFPOLL cookie indicates poll has expired. Issue getpoll http call to vf.big.com. |