> -----Original Message-----
> From: Erik Weber [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 02, 2004 10:33 AM
> To: Struts Users Mailing List
> Subject: Re: struts servlet chaining and immutable request?
>
>
> What happens when you append a query String that changes the original
> parameter value between Actions?
>
> For example, the original request is to A.do?foo=oldValue. Then when
> that Action finishes processing, it forwards to B.do?foo=newValue.
>
> Doesn't that work or am I misunderstanding?
Yes, you are misunderstanding. Forward is an internal struts only forward, it has
nothing to do with an http forward, ( or a forward pass, or being forward, or forward
address :) ). The user will never see anyting until you get to the final action, and
even then only if it forwards to a jsp. So, what you are doing is simply calling
methods, using the struts action forward as your calling mechanism.
iow the equivalent of:
blah Action1 {
execute( blah){
Action action = new Action2();
action.execute(blah);
action = new Action3();
action.execute(blah);
action = new Action4();
action.execute(blah);
returng blah;
}
}
Which is not what I think you want.
>
> Erik
>
>
>
> Woodchuck wrote:
>
> >--- Jim Barrows <[EMAIL PROTECTED]> wrote:
> >
> >
> >
> >>
> >>
> >>>-----Original Message-----
> >>>From: Woodchuck [mailto:[EMAIL PROTECTED]
> >>>Sent: Thursday, September 02, 2004 10:02 AM
> >>>To: struts
> >>>Subject: struts servlet chaining and immutable request?
> >>>
> >>>
> >>>hihi,
> >>>
> >>>in my Action object, i am doing servlet chaining by forwarding to
> >>>another ".do" instead of forwarding to a ".jsp". so if i chain
> >>>
> >>>
> >>five
> >>
> >>
> >>>different Actions, they will execute like: Action1 -> Action2 ->
> >>>Action3... Action5
> >>>
> >>>however, when doing this, the original request object is maintained
> >>>throughout the chaining such that Action5 doesn't know (or care)
> >>>whether the request was made directly or indirectly.
> >>>
> >>>my problem is that during the chaining, each Action looks at the
> >>>
> >>>
> >>same
> >>
> >>
> >>>parameter in it's execute method to decide to do something. but
> >>>because the request is immutable the next Action sees the same
> >>>parameter value and does the same thing.
> >>>
> >>>how can i change the value of the request parameter after it's been
> >>>'used' by one Action, so the next Action sees an updated paramter
> >>>value?
> >>>
> >>>
> >>Ummmm..... this sounds bizaare enough to make me question the
> >>engineering behind this. Seems like it would be better to put the
> >>code your trying to execute into a business logic layer, or
> otherwise
> >>outside the action class to begin with. However, I'll assume you
> >>have no choice...
> >>
> >>However, in answer to your qustion... have the action class check a
> >>session attribute first, then check the request parameter.
> >>
> >>
> >
> >i'm implementing a "wizard". it contains multiple different screens
> >(jsps), so i decided to make an abstract Action class to handle the
> >"Next", "Back" buttons on each jsp.
> >
> >are there better strategies to handle "wizard" scenarios in struts?
> >
> >so in my abstract Action class i'm looking at the button paramter, if
> >it's "Next" i will call an abstract Save method that the super class
> >implements. then i will forward to the next Action screen (same
> >abstract class).. but the request parameter button still
> says "Next" so
> >it keeps going next forever... :/
> >
> >
> >
> >
> >>
> >>
> >>>(if you're wondering why my Actions are setup like this, it's
> >>>
> >>>
> >>because
> >>
> >>
> >>>they all extend the same abstract Action class that has logic to do
> >>>processing based on the request parameter... so what's really
> >>>happening
> >>>is that each Action is executing the same thing but i'd like
> >>>to be able
> >>>to have them do different things)
> >>>
> >>>any suggestions is much appreciated and thanks in advance,
> >>>
> >>>woodchuck
> >>>
> >>>
> >>>
> >>>
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> >
> >
> >
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