Re: Need Microsoft Help: Session object retrieving another user's Session information
From: Patrice (nobody_at_nowhere.com)
Date: 04/19/04
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Date: Mon, 19 Apr 2004 20:45:04 +0200
A module is a class with shared variables (possibly as private members). As
such all users are sharing the same g_Info.
"Boban Dragojlovic" <news@_N_O_S_P_AM_dragojlovic.org> a écrit dans le
message de news:u6Tgc.24224$ej3.4539@newssvr27.news.prodigy.com...
>
> I'm building a complex web-based reservations system.
>
> Gathering the user's data requires between 8 and 15 pages (depending on
> which options they are interested in). I use the "Session" object to
store
> the various elements as the user moves through the pages.
>
> Rather than storing the preferences directly in the Session object (e.g.
> Session("LastName") = ...), I created a class
>
> <Serializable()> Public Class ReservationInfo
>
> This class has private variables for all the data, and exposes properties
to
> retrieve/manipulate the data. I did this for several reasons:
> * I don't have to worry about screwing up variable names from one page
> to the next (is it Session("OptionNumber") or is it
Session("OptionNbr")) --
> * I can add some logic related to the assignment of properties (e.g.
if
> a property changes, I might need to reset other properties)
>
>
> In one of my modules I declare
>
> dim g_Info as ReservationInfo
>
> And on each page, then, in the OnLoad event, I have something to this
> effect:
> g_Info = Current.Session("ReservationInfo")
>
> (actually, in the OnLoad event I call a public sub in one of my
> modules, and it does the retrieval. That's why it references
> Current.Session)
>
>
> and in the Unload event, I have
> Session("ReservationInfo") = g_Info
>
>
> This way my entire set of variables is loaded from the Session, and saved
> back to the session each time.
>
> I let .NET manage the Session object in memory (single server), and
> everything works great (or at least it did during my development/testing).
>
>
>
> The problem happened when we ran the first multi-user test (e.g. 5 people
> testing at the same time).
>
>
>
> Suddenly, as users moved from page to page, their session information was
> getting swapped with the information from another user. Every so often
> (every couple of pages or so), as you moved from one page to another, you
> suddenly wound up with the data of another user on the system.
>
>
> I then added logic so that in the unload event, it would serialize and
dump
> the entire g_Info object to disk, and the filename would be based on the
> SessionID of the user. That way I could trace the session information of
> each user as they moved from page to page. I've confirmed that this
happens
> there. It seems that when it retrieves the data from the Session object
> g_Info = Current.Session("ReservationInfo")
> it sometimes grabs the wrong data.
>
> I've analyzed several hundred page requests, and found many occurrences,
but
> can't find any pattern to it.
>
>
> I don't have a clue how this could be. Any ideas?
>
>
>
>
>
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