Dan,
I hv a few servlets which basically form a part of of one module.
Similarly there are some more modules having more servlets. Ur concept of
having a servlet control manager sounds very promising. It definitely would
lessen repeated code but will it really help in the long run to make the
system maintanable/extensible and simple?
I hv never used url mapping. Cn u suggest me some exps?
Also, the idea of writing a bean to do the business logic is good but
again, there will be one (or more) bean for every servlet. this makes the
system bigger. But I think the ease of changin the business logic without
touching the servlet-html stuff is definitely a time saver. I am currently
not using JSP.
Raaj.
> In my case I'm using all of them at the same time.
> .- I use a servlet that acts as control manager of the applications and
> takes care of security, logging issues and flow control. I use here
> something like the technique described by Craig for having just one
> servlet and using url mapping to define diferent operations.
> .- Applications are defined as a set of instances of a class called
> Operation(so they are not sets of servlets) and they have standard
> methods that the manager servlet uses to initialize the parameters,
> perform the operation and forward the result where appropiate. I thought
> about not using servlets because they almost always follow the same
> pattern (set the parameters, execute, forward to a JSP to see the
> results) and this way I can control all the "operations" as a coherent
> set of functionality, instead of a set of scattered servlets.
> .- The operations usually perform their functionality through EJB Beans.
> I have the bussines logic encapsulated with EJB so the operations are
> just the interface to call the EJB Beans appropiately given the
> parameters of the request and to handle gracefully some errors
> conditions.
> .- JSP pages are used as user interface only, to display the results of
> the Operations performed. Those Operations communicate the results to
> the JSP through standard classes, even though I'm planning to try to
> make them beans, so I can save some Java code on the JSP.
> .- Just to add some spice to the mix, and as Craig suggested, I use XML
> to define the configuration of the application, including operations
> defined(loaded dynamically in runtime), security access settings,
> application-wide events... I get most of the information from a
> database, I use JavaMail for logging purposes... You see that one of
> this things can get quite complex. So I'd recommend to start from the
> beggining and add ingredients to the mix when you feel more comfortable
> with the ones you are using. You can also get an Application Server that
> does most of this for you :), I did it myself because I'm not quite
> satisfied with the ones I've tested so far so I'm building my own
> lightweight environment with so many standard features as I can so I can
> replace them with features built in all app servers when they become
> real standards.
>
> I know this is not really an answer to your question, but I hope it
> helps somehow.
> Regards,
> Dan
> -------------------------------------------
> Daniel Lopez Janariz ([EMAIL PROTECTED])
> Web Services
> Computer Center
> Balearic Islands University
> -------------------------------------------
>
> Chris Macias wrote:
> >
> > ...and this could probably be expanded to "When to use a servlet and
when
> > to use a Bean and when to use an EJB", but now we're asking for a white
> > paper! :-)
> >
> > But, seriously, can any of the gurus out there help out us newbies with
> > some 'rules of thumb' for when to use which technology? Rough guesses
and
> > half-formed opinions welcome. It's more than we have now!
> >
> > Christopher
> >
> > -----Original Message-----
> > From: Carlos H. Lopez [SMTP:[EMAIL PROTECTED]]
> > Sent: Monday, October 25, 1999 8:25 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: when to use Bean !!!
> >
> > I want to add to this question, When use a Bean and When to use a
> > Servlet?
> >
> > Thanks, Carlos.
> >
> > "The successful man make their own opportunities."
> >
> > "ACI Team (Chennai)" wrote:
> > >
> > > Hi
> > > Does any one has clear picture of when to use bean in Jsp....
> > > Help of any sort appreciated..
> > >
> > > Aciteam
>
>
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