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From "Eisert, Wolfram" <Wolfram.Eis...@Dresdner-Bank.com>
Subject RE: [PATCH] AW: XSP page getting called TWICE! (using pipeline as a transformer)
Date Fri, 14 Dec 2001 10:31:59 GMT
Hi Vadim,

> -----Urspr√ľngliche Nachricht-----
> Von: Vadim Gritsenko [mailto:vadim.gritsenko@verizon.net]
> Gesendet am: Donnerstag, 13. Dezember 2001 21:47
> An: cocoon-dev@xml.apache.org
> Betreff: RE: [PATCH] AW: XSP page getting called TWICE! 
> (using pipeline
> as a transformer)
> 
> Wolfram,
> 
> I applied your patch (with some modifications); please check that
> everything is working for you.
> 

Looks ok. Thanks.

> > Because XSP-Pages currently aren't cacheable (as far as I know)
> > no template is saved, so this happens each time the
> > page is called.
> 
> Regarding XSP page caching, you need to define couple of methods. Read
> on about caching of XSP in the thread:
> http://marc.theaimsgroup.com/?l=xml-cocoon-users&m=100142724706511&w=2
> 
> (This theme were discussed at least couple of times on user list)
> 

Thanks for the info - and you are right, I should had a look first to
mail archive.

But now I know more ;-)

> Vadim
> 
> > -----Original Message-----
> > From: Eisert, Wolfram [mailto:Wolfram.Eisert@Dresdner-Bank.com]
> > Sent: Wednesday, December 12, 2001 10:37 AM
> > To: 'cocoon-dev@xml.apache.org'
> > Subject: [PATCH] AW: XSP page getting called TWICE! (using 
> pipeline as
> a
> > transformer)
> > 
> > Hi David,
> > 
> > the origin of this problem has something todo with using
> > a cocoon-pipeline as a transformer-stylesheet which leads
> > to processing this pipeline more than one time.
> > A similiar problem occured in our app some time ago.
> > 
> > I think it's a problem in XSLTProcessorImpl.
> > 
> > Attached is a PATCH against cocoon_20_branch to fix the problem.
> > 
> > I will give a short description of the behaviour so that
> > someone can have a look on it.
> > 
> > During setting the consumer the XSLTProcessorImpl
> > is calling "stylesheet.getInputSource()" more than one time
> > (while searching for an existing template in memory).
> > For a SitemapSource each call leads to a processing of the hole
> > pipeline which also fires the generator every time this method is
> > called.
> > 
> > Because XSP-Pages currently aren't cacheable (as far as I know)
> > no template is saved, so this happens each time the
> > page is called.
> > 
> > The attached patch calls "getInputSource" only once and uses
> > the returned InputSource in any subcalls.
> > 
> > Another "cleaner" solution would be just to use
> stylesheet.getSystemId()
> > instead of inputSource.getSytemId() - but I don't know if the
> > result is allways the same ;-).
> > 
> > Could someone please check my changes and apply the patch?
> > 
> > Thanks,
> > 
> > Wolfram
> > 
> > > -----Urspr√ľngliche Nachricht-----
> > > Von: David Rosenstrauch [mailto:darose@dti.net]
> > > Gesendet am: Montag, 10. Dezember 2001 20:12
> > > An: cocoon-dev@xml.apache.org
> > > Betreff: Fwd: XSP page getting called TWICE!
> > >
> > > Can someone help?
> > >
> > > I've got a rather complex problem with C2 which I've not been
> > > able to figure out despite some major debugging sessions.
> > > Posted this several times to the Cocoon Users list too, but
> > > no one had any info.
> > >
> > > I'm suspecting the problem I'm seeing might be a bug in C@,
> > > but maybe someone here might be able to tell me for sure.
> > >
> > > Details about my problem are in the message below.
> > >
> > > I'm using C2, RC1a, if that matters.
> > >
> > > TIA!
> > >
> > > DR
> > >
> > >
> > > >Date: Fri, 07 Dec 2001 12:07:52 -0500
> > > >To: cocoon-users@xml.apache.org
> > > >From: David Rosenstrauch <darose@dti.net>
> > > >Subject: XSP page getting called TWICE!
> > > >
> > > >Actually, regarding the setup below, I'm having a problem
> > > with it and would appreciate some help.
> > > >
> > > >Take a look at the sitemap segment below.  And let me
> > > clarify it a bit too:
> > > >
> > > >The XSL stylesheet that I'm using in the transform on
> > > "pd/mergedoc.html" is generated *dynamically*, from an xsp
> > > page ("pages/gen_merge_xsl.xsp").
> > > >
> > > >This is working just fine, except for one small problem:
> > > >
> > > >For some reason, on each request, this XSP page is getting
> > > executed TWICE!  Although this doesn't technically cause any
> > > errors, it's pretty inefficient since it hits the database
> > > twice, generates the xsl twice, etc.
> > > >
> > > >Any ideas why?
> > > >
> > > >Some possible thoughts I had:
> > > >
> > > >* perhaps the internal-only="true" is causing this?
> > > >
> > > >* perhaps an additional aspect of this setup is causing
> > > this:  the "cocoon:/rtf_parse" generation step (not listed)
> > > is setting an "attachment" response header
> > > ("Content-Disposition: attachment; filename=myfile.rtf") so
> > > that the file will be downloaded instead of displayed
> > > directly in the browser.  Could that be causing this?
> > > >
> > > >Any help appreciated!
> > > >
> > > >TIA!
> > > >
> > > >
> > > >DR
> > > >
> > > >
> > > > ><map:pipeline>
> > > > >          <map:match pattern="pd/mergedoc.html">
> > > > >                  <map:generate src="cocoon:/rtf_parse"/>
> > > > >                  <map:transform src="cocoon:/rtf_merge_data"/>
> > > > >                  <map:serialize type="rtf"/>
> > > > >          </map:match>
> > > > ></map:pipeline>
> > > > >
> > > > >
> > > > ><map:pipeline internal-only="true">
> > > > >          <map:match pattern="rtf_merge_data">
> > > > >                  <map:generate type="serverpages"
> > > src="pages/gen_merge_xsl.xsp"/>
> > > > >                  <map:serialize type="xml"/>
> > > > >          </map:match>
> > > > ></map:pipeline>
> > >
> > >
> > >
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> > > For additional commands, email: cocoon-dev-help@xml.apache.org
> > >
> 
> 
> 
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