At 07:22 PM 12/28/99 -0800, Ferdinand Say wrote:
>The user session object that im referring to is a customed class where all
>the values of the display fields are stored (retrieved via
>getAnyUserSessionObject).
>
>I tried to save it in the instance variable during the page's
>onBeforeDisplayEvent() and there was a significant increase in performance.
That's fine, it works. You could set prefetch and then there wouldn't be
any issue. It's not necessary to do so, but if somebody later changes the
code not knowing why it was done a certain way, it wouldn't make any
difference.
-- Curt
>Curt Springer <[EMAIL PROTECTED]> wrote:
> >I'm not sure exactly what you mean when you talk about "the user session
> >object".
> >
> >Are you using some ND-supplied object (which I've stayed away from), or
> >have you created an object of your own that holds several values, and which
> >you retrieve from the session via get[Any]UserSessionObject, or is it that
> >each value is stored in the session with a different key?
> >
> >You're right, you can't set up the display values in the page-level
> >onBeforeDisplay because its initilialization will tend to clear out
> >whatever you did. Another option is to use the page-level
> >onBeforeRowDisplay event, which occurs as part of page-level display
> >processing.
> >
> >But I think you might be assuming that you are getting stuff out of the PE,
> >when such is not the case. For the purpose of understanding the flow of
> >processing of ND, it is useful to think that every call to
> >'getUserSessionObject' calls for a fetch from the PE. That doesn't
> >actually happen, in most cases. At the beginning of a web event, there is
> >a single fetch of all the session variables from the PE, which are then
> >stored in a hashtable to which the web event has a reference. Calls to
> >'getUserSessionObject' actually cause lookups to the local hash table, not
> >across the CORBA chasm to the PE. At the end of the web event, the local
> >values, if changed, are updated back to the PE.
> >
> >As of ND 4 you can set some options so that, for example, certain session
> >values are not fetched from the PE until you ask for them.
> >
> >In javadoc see CSpider.setSession(), CSpSession.setSessionCachingControl(),
> >CSpSessionCachingControl
> >
> >-- Curt Springer, Team ND
> >
> >
> >At 03:02 PM 12/28/99 -0800, Ferdinand Say wrote:
> >
> >>Every field in my page gets its value from the user session object.
> >>I plan to retrieve the values from the user session object
> >>and display it during the page's this_onBeforeDisplayEvent().
> >>But I dont think this would work. I need to display the value on each
> field's
> >>on_BeforeDisplayEvent(). But retrieving the values from the same user
> >>session object
> >>on every field's onBeforeDisplayEvent() seemed to be very expensive - it
> >>slows down
> >>processing since it's getting the value from the PE.
> >>
> >>Now my question is: Is it safe to retrieve the values from the user
> >>session object on the
> >>page's onBeforeDisplayEvent() and temporarily store them in an instance
> >>variable and
> >>use the instance variable to display each field on the field's
> >>onBeforeDisplayEvent().
> >>
> >>I would appreciate your answer.
> >>
> >>Thanks.
> >>
> >>Ferdie Say
> >>
> >>
> >>
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> >>
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> >
>
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