AFAIK there is no problem with page session objects, just with instance
variables. Of course, if you load page session objects from instance
variables that have not been properly initialized, that would be a problem.
-- Curt Springer, Team ND
At 11:25 PM 7/25/99 -0500, Ryan Gustafson wrote:
>I'm still dumbfounded as to why ND doesn't re-initialize all page
>session objects on a page (and removing those that are not initially
>placed on the page in the studio) before giving them to the worker
>thread. Only reason I can think of is performance, but that is a
>poor reason considering the problems this can cause. Without this
>capability, one has to code defensively when using page session objects.
>At the least, it would be handy to be able to configure the system
>to spit an warning if a web event tries to read from a page session
>object that was not written to (or initialized) in that same web event.
>
>Here's a chunk of code we use in the onBeforeProjectFreeEvent of
>our common page class. It works under the following assumptions,
>(1) All of our page session objects start with "ksePag" (2) all
>of our page session objects are strings. This isn't an example
>of "correct" code (subjectively, whatever that means), but so far
>it seems to work for us in ND5.
>
> // Wipe out all of our page session objects. If we don't they seem
> // to get set to odd values here an there.
> //
> // Note: Removing our objects has really bad side-effects, that's
> // why just wipe them out instead.
> Hashtable objects = getPageSession().getHashTable().getHashTable();
> Enumeration keys = objects.keys();
> while (keys.hasMoreElements())
> {
> String key = (String)keys.nextElement();
> if (key.startsWith("ksePag"))
> {
> putPageSessionObject((String)key, new CSpString(""));
> }
> else
> {
> // FIX: Is it okay to remove ND page session variables? I have
> // noticed no ill side-effects from this yet.
> removePageSessionObject((String)key);
> }
> }
>
>Be well,
>Ryan
>
>Johann Ludwig wrote:
> >
> > "LadyNaureen" <[EMAIL PROTECTED]> wrote:
> > >
> > >Dear ND Experts
> > >
> > >Hello to All,
> > >
> > >The problem scenario is I have a variable that is used by all
> functions in a page.
> For the first time the project starts nicely, moving
> initializing value in this
> variable. But if I rerun my application then the old value of
> the variable is retrieved,
> so my application goes down. Anyone knows why this is happening????
> > >Thanks in advance.
> > >
> > >Regards,
> > >LadyNaureen
> > >
> >
> > I have noticed too that page variables seem to keep their values, even
> if the user
> session is out. The only way I found is to re-initialize
> variables , e.g. at yourPage_onBeforeDataObjectExecuteEvent.
> > If you find a much better way, please tell me.
> >
> > Johann Ludwig ([EMAIL PROTECTED])
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