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List:       tapestry-user
Subject:    T5: Is Persist("conversation") planned?  Please?
From:       Geoff Callender <geoff.callender () mac ! com>
Date:       2007-11-28 12:06:24
Message-ID: AF930C1D-81CE-49EB-9005-562C784442ED () mac ! com
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Hi,

T5 has done some great work in handling common web problems with its  
fresh approach to navigation, but I'm very concerned that T5 will be  
swept aside by developers demanding frameworks that, at last,  
completely deal with the Back button, double-submit, etc, etc.  It's  
ridiculous that we all keep hunting around to solve these issues, and  
I reckon we'll jump at any framework that does it for us.

A classic case in point is "session" persistence.  It so nearly works,  
but in fact it's dangerous.  It doesn't even handle multiple windows  
and tabs safely (why? because they share the same HttpSession and  
therefore have concurrent access to the same "session" persisted  
objects).  Over and over again, developers have to use a lot of brain- 
power to make it safe.  Actually, I haven't seen anyone come up with a  
"cookbook" solution.

Then, along comes JBoss Seam offering a solution - "conversations".  I  
believe that Seam can tag each window and tab with its own  
conversation id and  persist its objects in the session tagged with  
conversation id.  It can even tag windows within windows, or so I  
believe.  They claim that conversations "eliminates a whole bunch of  
bugs caused by back buttons, refresh buttons, double submits, multi- 
window browsing, post then redirects, 'these all vanish when you have  
conversations'.".  (http://www.infoq.com/news/JBoss-SEAM-1.0-Gavin-interview 
)

So, could T5 introduce Persist("conversation") or something similar,  
and take a whole class of problems away for good?  Please, please?

If T5 doesn't offer a clear solution to each web problem then I fear  
people will be drawn to frameworks that do instead.  And that would be  
a massive shame.

Regards,

Geoff



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