Getting Progress Feedback

[David Neumann <dn...@apple.com>]

Is there a way to attache a "delegate" or "helper" object to some 
part of FOP that will result in FOP calling some method I write 
on it?  I'd like to inform users as to how many pages have been 
rendered plus give them other possible feedback about their 
report. For example for a 30,000 page report, say, it might be 
nice to tell the user that their job is on page 17,500 or 
whatever.

David


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Re: Getting Progress Feedback

[Jeremias Maerki <je...@outline.ch>]

Everything you need should be in there. 
See http://xml.apache.org/fop/embedding.html (under "Getting information
on the rendering process") for instructions how to get end results from
the rendering process. To report the progress to the user, you could
intercept the logging messages from FOP. These contain strings like "[1]"
which indicates the current page number being processed. The way to
intercept these notifications is to provide a custom implementation of
the org.apache.avalon.logger.Logger interface. Please mind that this
applies to the current CVS and the upcoming 0.20.4 release. The current
release still works with LogKit. But even there it is pretty simple to
create your own LogTarget to intercept logging messages.

Maybe we could also provide some sort of notification interface that is
being called during processing, but this has to be done first. Want to
try?

> Is there a way to attache a "delegate" or "helper" object to some 
> part of FOP that will result in FOP calling some method I write 
> on it?  I'd like to inform users as to how many pages have been 
> rendered plus give them other possible feedback about their 
> report. For example for a 30,000 page report, say, it might be 
> nice to tell the user that their job is on page 17,500 or 
> whatever.

Cheers,
Jeremias Märki

mailto:jeremias.maerki@outline.ch

OUTLINE AG
Postfach 3954 - Rhynauerstr. 15 - CH-6002 Luzern
Tel. +41 41 317 2020 - Fax +41 41 317 2029
Internet http://www.outline.ch


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