simple matchers to reduce overhead

[Torsten Curdt <tc...@dff.st>]

> > btw: do we already have an "always" matcher?
> > due to the lastest performance analysis we should better
> > substitute
> >
> > <map:match pattern="*"> or <map:match pattern="**">
> >
> > with
> >
> > <map:match type="always">
>
> Well, you might end up with Matchers like
>
>     <map:match type="startsWith" pattern="foo">
>
> or
>
>     <map:match type="endsWith" pattern="bar">
>
> for performance reasons and the numbers of Matchers will exponantially
> grow.

...well, could you really think of more? If I look into our sitemaps those are 
the most widely used ones. All other would be regexpr / wildcard.

I don't think it's that bad... If I can really save that amount of per-request
processing time - I would go for it!

We could also modify the WildcardMatcher and hardcode some patterns instead...

pattern="**"
pattern="**something"
pattern="something**"

would be interesting to see the impact on performance...
--
Torsten

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Re: simple matchers to reduce overhead

["J.Pietschmann" <j3...@yahoo.de>]

Torsten Curdt wrote:
> ...well, could you really think of more? If I look into our sitemaps those are 
> the most widely used ones. All other would be regexpr / wildcard.
> 
> I don't think it's that bad... If I can really save that amount of per-request
> processing time - I would go for it!

I wouldn't recommend to do this because:

> We could also modify the WildcardMatcher and hardcode some patterns instead...

This is indeed the way to go: automatically recognize patterns instead of
bothering the user to do it manually.
I'd go even farther and try to build a DFA for
  <map:match pattern="foodir/**html">
    ...
  </map:match>
  <map:match pattern="bardir/**html">
    ...
  </map:match>
the same way lexers do. In the example above, you can decide where to go
after examining *one* character...

J.Pietschmann


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