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RE: Servlet setup question

From: Yves Lafon <ylafon@w3.org>
Date: Thu, 10 Mar 2005 18:59:07 +0100 (MET)
To: "Laird, Brian" <BLaird@perseco.com>
cc: www-jigsaw@w3.org
Message-ID: <Pine.GSO.4.62.0503101851100.20596@gnenaghyn.vaevn.se>
On Wed, 2 Mar 2005, Laird, Brian wrote:

> Yves,
> I am still struggling with this one.  I build a custom resource which 
> just extends the ServletWrapper.  Since I am using JDK 1.4 I decided it 
> would use regular expressions.  Here is the code:

the Lookup mechanism works only on containers, while ServletWrapper is a 
"leaf" resource.
So the lookup mechanism is never called.

> package org.w3c.jigsaw.servlet;
> import org.w3c.tools.resources.LookupResult;
> import org.w3c.tools.resources.LookupState;
> import org.w3c.tools.resources.ProtocolException;
> public class PersecoFrameworkServletWrapper extends ServletWrapper
> {
> 	public boolean lookup(LookupState ls, LookupResult lr) throws ProtocolException
> 	{
> 		if (ls.getURI() != null && ls.getURI().matches(getIdentifier()))
> 		{
> 			lr.setTarget(getResourceReference());
> 			return true;
> 		}
> 		return super.lookup(ls, lr);
> 	}
> }
> Then I defined a DirectoryResource with a ServletDirectoryFrame 
> underneath it.  Then I added a resource under that directory with the 
> identifier of *.flow and pointed it to the class above.  In stepping 
> through the code it just never seems to get my class.  I always get a 
> 404 back from the server.  Can you let me know what I am doing wrong on 
> this?  I should be extending the ServletWrapperFrame instead?

Wouldn't it be possible to have an indexer to handle this?
you can map the "flow" extension to a FileResource+ServletMapperFrame and 
point to the URI of the servlet in charge of handling them.
(a bit like for JSPs [1])
The servlet is located using an internal lookup, so it may be everywhere 
on the server.
Or maybe I just misread what you really want there :)

[1] http://www.w3.org/Jigsaw/Doc/User/jsp.html

> Thanks,
> Brian
> -----Original Message-----
> From: Yves Lafon [mailto:ylafon@w3.org]
> Sent: Wednesday, February 23, 2005 4:25 AM
> To: Laird, Brian
> Cc: www-jigsaw@w3.org
> Subject: Re: Servlet setup question
> On Tue, 22 Feb 2005, Laird, Brian wrote:
>> How do I configure a servlet in Jigsaw to listen on a specific
>> extension?  This extension will not be mapped to any physical file on
>> the disk.  My example is that I want to have a servlet listen in a
>> specific directory for anything with .flow at the end.  Is this possible
>> and how would I go about doing it?  In that same directory, I will
>> probably have some images and static files.
> It is easy to do in the Jigsaw framework, but I don't know how to do that
> with servlets.
> The way to do this in Jigsaw is to overload the "lookup" method of a
> resource or a frame.
> If your .flow are linked to existing files, the ServletMapperFrame on top
> of a FileResource is the way to go (much like jsp, it delegates everything
> to a servlet with the path of the .jsp given to the servlet, see [1])
> It might work without any physical file on the disk if you replace the
> FileResource by a FramedResource which is only virtual.
> Thanks,
> [1] http://www.w3.org/Jigsaw/Doc/User/jsp.html
>  >
>> Thanks in advance,
>> Brian
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Yves Lafon - W3C
"Baroula que barouleras, au tiéu toujou t'entourneras."
Received on Thursday, 10 March 2005 18:00:04 UTC

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