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From Andre Beskrowni <ABeskro...@axeda.com>
Subject RE: Action chaining
Date Thu, 12 Dec 2002 20:43:13 GMT
just for the record, i'm in complete agreement with erik on this issue.  i
can remember reading warnings about how chaining actions isn't clean design
a long time ago.  and for a while i heeded those warnings.  but i eventually
found myself using the exact same pattern that erik mentioned when he
started this discussion.  it's modular and clean.  if someone has a better
suggestion than:
(1) call your delete action
(2) forward to list action
i'd like to see it, because it hasn't come up so far in this discussion.

i have to say, all of this "be careful" stuff seems a little dramatic.  it
seems the same admonishments could be used about writing methods whenever
you're using call-by-reference.  

ab

> -----Original Message-----
> From: Erik Hatcher [mailto:jakarta-struts@ehatchersolutions.com]
> Sent: Thursday, December 12, 2002 2:02 PM
> To: Struts Developers List
> Subject: Re: Action chaining
> 
> 
> Eddie Bush wrote:
> > Erik Hatcher wrote:
> > 
> >> There is no question that there are issues with forwarding 
> with form 
> >> population and such, and the known issue with multipart 
> data (which is 
> >> an isolated use-case anyway). 
> > 
> > 
> > The multipart issues exists regardless of whether you are 
> chaining or 
> > not - no?  I was of the impression that was the case.  The 
> single thing 
> > I see (and it's entirely possible I'm being short-sighted) 
> is that your 
> > form would be repopulated (which could be very evil to 
> track down if you 
> > hadn't already thought through the possibility of it happening). 
> > Redirecting avoids this issue altogether by causing another 
> request to 
> > be created.
> 
> We're talking a little non-sequitor here.  Action chaining in 
> no way is 
> tied to whether I'm doing redirects or server-side forwards - 
> either are 
> possible with them.
> 
> But you are absolutely correct about these issues.  I've not 
> encountered 
> them except with the multipart issue in a prior project.  I 
> don't modify 
> a form bean in these actions.  The only actions that modify a 
> form bean 
> in our system are the "setup" actions that populate a form prior to 
> forwarding to the JSP, and those would always be at the end 
> of a chain.
> 
> Just to clarify - I'm not chaining tons of stuff together, just for 
> situations like I've mentioned.  Generally speaking I'm doing "text 
> book" Struts development, but I find that action chaining is 
> very handy 
> in certain situations, and I'm thankful that Struts actually 
> allows it 
> rather than forbid it altogether somehow.
> 
> Its really just food for thought for the next architecture as 
> well as to 
> gather ideas from others on how they implement similar needs.
> 
> 	Erik
> 
> 
> 
> 
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