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Re: Filter order

From: Niklas Wiberg <e95_nwi@it.kth.se>
Date: Fri, 25 Feb 2000 13:22:18 +0100
Message-ID: <38B673FA.8391FB12@it.kth.se>
To: Yves Lafon <ylafon@w3.org>
CC: www-jigsaw@w3.org
Thanks for your response.
However, I don't understand how the filter calls are ordered when adding
multiple filters to the proxy resource (the same resource).
As in your example - how are Filter1 and Filter2 ordered?
Does the order in which they are displayed in jigadmin matter?

Best regards
Niklas Wiberg

Yves Lafon wrote:
> 
> On Fri, 25 Feb 2000, Niklas Wiberg wrote:
> 
> > Hello
> > I'm using Jigsaw as a proxy. I can't find anything in the documentation
> > about ordering of server-side filters.
> > Suppose that I have three server-side filters with ingoingFilter() and
> > outgoingFilter() methods. How can one   set which order these methods
> > are called when a request is processed?
> > E.g. Filter1.ingoingFilter(), then Filter2.ingoingFilter(), then
> > Filter3.ingoingFilter()...
> > This is interesting since Filter1 could modify the request, which would
> > affect how Filter2 would react...
> > Or will I have to create one single filter that performs all my filter
> > work in order to control it?
> 
> At some point, we though of a priority system for filters, ie filters are
> aggregated then sorted according to their priority, it was not implemented
> as it is very difficult to set an absolute value for a filter.
> The current algorithm gathers the filters, and they are executed in the
> order they were gathered, aka during the lookup of /foo/bar/foobar.html
> if you have a filter on foo and two filter on foobar.html
> foobar
>  |_HTTPFrame
>     |_Filter1
>     |_Filter2
> 
> You will have the FooFilter -> Filter1 -> Filter2 ingoingFilter calls
> then Filter2 -> Filter1 -> FooFilter outgoing calls.
> Hope this helps,
> 
>       /\          - Yves Lafon - World Wide Web Consortium -
>   /\ /  \        Architecture Domain - Jigsaw Activity Leader
>  /  \    \/\
> /    \   /  \   http://www.w3.org/People/Lafon - ylafon@w3.org
Received on Friday, 25 February 2000 07:23:02 GMT

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