[Zope] FSSession atomicity?

Wed, 12 Apr 2000 20:43:14 -0400 (EDT)

On Thu, 13 Apr 2000, Curtis Maloney wrote:

> 
> When you log in in this circumstance, two cookies get set (once for the verify
> page, once for the page it redirects you to).

This is what I expected as long as the two cookies have the same
SessionUID. If not then that is the problem.

> So.. If the cookie means it IS commiting, i'm left wondering why the
> information isn't showing up.  When a redirect occurs, is it possible
> the browser is making the new request on another thread, which
> _sometimes_ beats
> out the 'commiting' thread?  Or is commiting completed before the 
cookie is set?

As far as I understand calling RESPONSE.redirect, causes the RESPONSE
object to emmit the neccessary headers for redirection. In other words the
transaction has already finished, commited, and the client receives the
redirection headers before the client places the next request. The
redirected request can be served by any thread. Nevertheless as the
original transaction has already commited the FSSession data should be
available to the new request.

I have recreated your set up (if I am off let me know) and it works fine
for me. My standard_html_header looks like:

<HTML><BODY> 
<dtml-call FSSession> 
<dtml-if "FSSession.has_key('test')">
<P><dtml-var "FSSession['test']"> 
</dtml-if> 
<dtml-if flag> 
<dtml-call "FSSession.set('test','Hi')"> 
<dtml-call "RESPONSE.redirect('method2')">
</dtml-if>

and my method1 and method2 contain

<dtml-var standard_html_header> nothing
<dtml-var standard_html_footer>

if I call /Test/method1?flag=1

I get redirected to /Test/method2

which displays

Hinothing as expected.

Check if the two SessionUIDs in the two cookies match or use showSession
in the FSSession directory to examine the contents of the session file.

Regards

Pavlos