I can't promise when, but whenever I find myself working on it again,
I'll try to remember to contact you guys, or at least I'll repost. Right
now I'm working on Swing stuff, but I'll be doing another web app soon,
and maybe I can try something better then.
Erik
Freddy Villalba A. wrote:
Ok guys,
Don't want to be the party-booer, but since we have kind of agreed to some
point, shouldn't it be better to move this discussion off this usergroup?
Whoever takes the initiative, please send me the new location.
Cheers all,
Freddy.
-----Mensaje original-----
De: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
Enviado el: jueves, 07 de octubre de 2004 16:51
Para: [EMAIL PROTECTED]
Asunto: RE: cleaning session
Don't put this example under Apache License then. ;-)
Or have it patented (with the new patent laws in Europe no problem).
Hiran (getting offtopic)
-----------------------------------------
Hiran Chaudhuri
SAG Systemhaus GmbH
Elsenheimer Straße 11
80867 München
Phone +49-89-54 74 21 34
Fax +49-89-54 74 21 99
-----Original Message-----
From: Erik Weber [mailto:[EMAIL PROTECTED]
Sent: Donnerstag, 7. Oktober 2004 15:33
To: Struts Users Mailing List
Subject: Re: cleaning session
Yes, that is a good example.
My only requirement here is that no one from STANDARDS BANK
may ever make use of it.
:)
Erik
Freddy Villalba A. wrote:
There is another typical example:
You have a search screen. after performing a search, you
select one of
the items in order to... say... edit it. You go to the
edition screen
(form) and, once you've concluded working with that item (typically:
saved, deleted or canceled), you return to the search screen, where
you'd see the (refreshed version of the) last search
results' table (to
keep it simple, don't even assume there is pagination).
-----Mensaje original-----
De: Erik Weber [mailto:[EMAIL PROTECTED] Enviado el:
jueves, 07
de octubre de 2004 15:31
Para: Struts Users Mailing List
Asunto: Re: cleaning session
I think a good place to start would be to start a list of
situations or
use cases encountered where this type of device was implemented or
needed (not just with "wizards", but with session attributes
in general
I think). Then we could look at the list after a while and
see what all
or many of the entries have in common -- try to recognize a pattern.
Then maybe we could try to create a class that solves the common
problem
-- one that could be inserted into a filter, a request processor, or
whatever, making it generically applicable (Struts or not).
I would be
willing to contribute if it caught on, because I certainly have
encountered a need for this more than once.
For example, I recently I finished a Struts application that had an
area (a set of pages/commands) for "vendors". One of the things a
vendor could do was search for an item, and then upload files to
"attach" to that item (such as photographs). So the
ActionForm used for
the file upload screen not only kept track of the normal properties
associated with file uploading, but also the item. The item,
in turn,
housed a collection of attributes describing every file currently
attached to that item. So when you viewed the upload screen,
you could
see all the existing uploads, and the details about the item
you were working with.
Even though it wasn't a proper "wizard", I decided to keep
the form in
session scope, because users could make mistakes (such as invalid
input) and continually end up back at the screen. I didn't
want to keep
reloading the item and all the existing file info every time
the page
was needed. So I ended up writing a "cleanup" method in a
base Action
class that got rid of the form when it figured that the vendor was
probably finished using the file upload area (such as when
he returned
"home").
Probably you guys have far better examples, but that's just
one off the
top of my head.
And XML is almost always good.
Erik
Freddy Villalba A. wrote:
Well guys, although on the same direction you are pointing to, I do
believe though that the more framework-independent the solution is,
the better. So, my thought:
Why not have a XML descriptor where you can explicitly
define your wizards?
In that way:
(1) No matter where your resources are, they'll get cleansed.
(2) You'll be able to reuse resources at free will on
several wizards
(without having to replicate them).
(3) You won't have to set up any structure or hardcode anything in
order to determine what's to be cleansed an what not.
What do you think?
-----Mensaje original-----
De: Erik Weber [mailto:[EMAIL PROTECTED] Enviado
el: jueves,
07 de octubre de 2004 13:26
Para: Struts Users Mailing List
Asunto: Re: cleaning session
Yeah, "similar naming convention" is the key to making it easier on
yourself.
Also, as I tried to suggest once before (in a riddle -- "a
single key
can open many doors" -- ha ha ha grasshoppah), you can store
references to many objects under a single attribute key (using
structured/nested beans, maps, etc.). Delete the single attribute
(perhaps when a user returns to a main view) and you delete
the entire
tree of references, freeing up all that memory with one
statement and
without having to write too much conditional code. I'm not sure if
this strategy is feasible with Struts session-scoped forms though.
Erik
[EMAIL PROTECTED] wrote:
Hi, Erik and Freddz.
I like the idea of having a wizard whose data gets cleaned
as soon as
it's
scope is left.
How about this: Have all resources for one wizard in a URL
subdirectory.
Have a similar naming convention for the resources the
wizard leaves
in the session. If a http request comes for an url, the
janitor filter
could
remove
all wizard's session resources that do not match the
current request's
directory.
This way the janitor could be fairly generic.
Hiran
-----------------------------------------
Hiran Chaudhuri
SAG Systemhaus GmbH
Elsenheimer Straße 11
80867 München
Phone +49-89-54 74 21 34
Fax +49-89-54 74 21 99
-----Original Message-----
From: Erik Weber [mailto:[EMAIL PROTECTED]
Sent: Donnerstag, 7. Oktober 2004 11:55
To: Struts Users Mailing List
Subject: Re: cleaning session
This is similar to what I usually implement. I have been
gradually
developing a "session manager" or perhaps a "session
janitor" that
watches/tracks workflow and cleans up stuff from memory (session)
that isn't needed anymore. It could be a filter or a
custom request
processor in the world of Struts. Since I most often use my own
controller Servlet I have my own place to put it, but
basically, it
gets invoked before any request handlers.
Erik
Freddy Villalba A. wrote:
Hi,
I have never implemented anything like this (with Struts),
but this is
the first thing I can think of...
Assuming your wizard is one-way (by this, I mean you
have a linear
graph - 1<->2<->3... -, no bifurcations and /or
intersections and / or
parallelism), you could "define" your "workflow" by
"tagging" the pages it is made of...
then, manage the wizard from a filter that is able to
detect your
getting into one and your leaving it. Once it detects
someone's left a
wizard, and knowing its components, it could have them
cleaned off the
corresponding Session.
I believe, however, that this approach wouldn't work if
the graph
is not linear.
I'll be glad to here your feedback (everybody).
HTH,
Freddy.
-----Mensaje original-----
De: Paul McCulloch [mailto:[EMAIL PROTECTED]
Enviado el: jueves, 07 de octubre de 2004 10:27
Para: 'Struts Users Mailing List'
Asunto: RE: cleaning session
That isn't the purpose of the (confusingly named) reset
method. Reset
is there to, typically, deal with the html forms submit
checkbox fields
(they don't submit anything if they are null).
Paul
-----Original Message-----
From: Leandro Melo [mailto:[EMAIL PROTECTED]
Sent: Wednesday, October 06, 2004 5:43 PM
To: Struts Users Mailing List
Subject: Re: cleaning session
If you have your action in HttpSession, why don`t you just
call reset
whenever a user clicks on the button supposed to start
this wizard?
--- struts lover <[EMAIL PROTECTED]> escreveu:
Hello everyone,
I am facing this problem of session. I have my action form in
session(a wizard like thing). Now if the user starts
filling in
values and clicks on the NEXT button, to go on to the next
screen and then instead of completing the process of
application,
clicks on
some other link.
Again he wants to start with the application process, the form
get pre-populated with the previous values, as the
form in still
in session. I want a clean form.
How to overcome this problem???
Any ideas???
Thanks.
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