Re: Load Balancing web applications with mod_proxy...

[Sylvain Wallez]

Unico Hommes wrote:

Upayavira wrote
 

Sylvain Wallez wrote:

   

Upayavira wrote:

<snip/>

     

If relevant, I've started extending the MountTableMatcher 
       

to include
   

the code from the host selector. This means that you can set up 
virtual hosts in the matchtable.xml file, and have 
       

sitemaps mounted 
   

based upon hostname.
       

Mmmh... is it good to mix prefix-based and host-based mounts in a
single matcher?
     

Don't know/don't mind. I'd be happy to have a HostTableMatcher that 
extends/works with the MountTableMatcher. My desire/need is to see a 
system that enables me to do host based matching. I could 
happily have: <map:match type="host-table"> .... </map:match> 
<map:match type="mount-table"> ... </map:match>

   

Instead of using a host-header specific approach you could also opt to do a more general match on a user defined parameter. I use that approach in my sitemaps as well:

<map:select type="parameter"> <!-- o.a.c.selecting.ParameterSelector -->
 <map:parameter name="parameter-selector-test"
value="{request:serverName}" />
 <map:when test="myhost">
    ...
 </map:when>
 ...
</map:select>
This means you match on any string that is obtainable from an input module.

I imagine the syntax in this case to be something like:

<mount-table>
 <mount 
   pattern-to-match="myhost" 
   value-to-compare="{request:serverName}" 
   src="..."
   uri-prefix=""
 />
 <mount 
   pattern-to-match="woody-samples" 
   value-to-compare="{requestURI}" 
   src="..." 
   uri-prefix="woody-samples" />
<mount-table>

Notice that you would also be able to do a 'normal' mount match.

Maybe we could even say that when pattern-to-match and value-to-compare attributes are missing the implementation defaults to using the uri-prefix to match against.
 

Hey, hold on! Are the above use cases _really_ useful? We should not 
reinvent a "sitemap lite" language for the sake of the genericity of 
mount tables!

Sylvain

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Sylvain Wallez                                  Anyware Technologies
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