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From "Craig R. McClanahan" <craig...@apache.org>
Subject RE: partial URLPatternMatching in Tomcat 4.0 (Servlet 2.3 spec)?
Date Mon, 06 Aug 2001 16:45:06 GMT


On Mon, 6 Aug 2001, Loïc Lefèvre wrote:

> Would/Must the RewriteValve do that?
> 

Well, you can certainly use Valves if you don't mind being tied to Tomcat
4.  But, to implement a controller type mechanism that uses request
dispatchers, a Filter is a much better answer (the only way a Valve can do
the dispatch is to change the Request URI to select the appropriate
servlet).

Doing the pattern matching yourself (say, with the jakarta-regexp
package) inside a Filter still avoids all the "thousands of if
statements" you are worried about.  (But talking about how to implement
this is straying into TOMCAT-USER topics -- this list is for Tomcat
development related questions).

> Loïc Lefèvre
> 

Craig


> note  : thanks Pier ;)
> note 2: it worked before, I mean the e-mail address
> 
> -----Message d'origine-----
> De : Craig R. McClanahan [mailto:craigmcc@apache.org]
> Envoyé : samedi 4 août 2001 04:08
> À : 'tomcat-user@jakarta.apache.org'
> Cc : 'tomcat-dev@jakarta.apache.org'
> Objet : Re: partial URLPatternMatching in Tomcat 4.0 (Servlet 2.3 spec)?
> 
> 
> 
> 
> 
> On Thu, 2 Aug 2001, Ru, Simon wrote:
> 
> > I wonder if Servlet 2.3's Filter allow partial URLPatternMatching.
> Something
> > like:
> >
> > <filter-mapping>
> > <filter-name>timerFilter</filter-name>
> > <url-pattern>/Controller?action=timer*</url-pattern>
> > </filter-mapping>
> > If it can, then we can use the Filtering mechanism as a controller to do
> > request dispatching. We can avoid having thousands if statements in the
> > Controller and we can easily modify the dispatching route without
> recompile.
> >
> > If it can't, is it something worth enhancing? What needs to add to have
> that
> > capability? Thanks in advance.
> >
> 
> While what you propose might be quite nice, Tomcat needs to conform to the
> servlet spec's rules for what a legal <url-pattern> can contain -- it's
> the same for both filter mappings and servlet mappings -- and this pattern
> is not legal.
> 
> One strategy would be to match for "/Controller/*" and let the filter look
> at the query parameters to decide whether or not to do anything
> special.  Otherwise, it can just pass the request on unmolested.
> 
> > Simon Ru
> > Software Engineer
> > (510) 897-5331
> > http://www.worldchain.com
> >
> 
> Craig McClanahan
> 
> 


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