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Posted to fop-users@xmlgraphics.apache.org by fletcher111 <fl...@gmail.com> on 2008/07/21 23:32:36 UTC

Stopping FOP in Java

Hi Everyone,

I am wondering if there is anyway to stop a FOP process once you have
started it from Java.

To be more exact I am using starting FOP in a new Thread in Java and then
opening the window which the pdf which is generated will be shown. But if
the user decides that is not what they wanted to do they close the window
but it does not stop FOP. Yes I know that I could just kill the Thread but
there is no fail-safe way to do that. 

Is there any way that I can tell FOP itself from the Java program that it
should stop it's processing. I am not worried about keeping stuff that it
has generated and it will be dropped automatically.

Any help is great,
Thanks,
fletcher111 
-- 
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Re: Stopping FOP in Java

Posted by Jeremias Maerki <de...@jeremias-maerki.ch>.
We don't currently provide a way of gracefully stopping FOP in
mid-process. You could experiment with subclassing RenderPagesModel and
check for a "stop" boolean in addPage() and throw a RuntimeException.

For that you'll also have to subclass AreaTreeHandler. I'll just
copy/paste some code here I once used to play with CachedRenderPagesModel.
I'm sure you can adjust that to your needs.

    private static class MyAreaTreeHandler extends AreaTreeHandler {

        public MyAreaTreeHandler(FOUserAgent userAgent, String outputFormat, 
                OutputStream stream) throws FOPException {
            super(userAgent, outputFormat, stream);
        }

        protected void setupModel(FOUserAgent userAgent, String outputFormat, OutputStream stream) throws FOPException {
            this.model = new CachedRenderPagesModel(userAgent,
outputFormat, fontInfo,
                    stream);
        }
        
    }

[..]

                Fop fop = fopFactory.newFop(outputFormat, ua, out);
                
                AreaTreeHandler atHandler = new MyAreaTreeHandler(ua, outputFormat, out);
                ua.setFOEventHandlerOverride(atHandler);

Maybe that helps.

On 21.07.2008 23:32:36 fletcher111 wrote:
> 
> Hi Everyone,
> 
> I am wondering if there is anyway to stop a FOP process once you have
> started it from Java.
> 
> To be more exact I am using starting FOP in a new Thread in Java and then
> opening the window which the pdf which is generated will be shown. But if
> the user decides that is not what they wanted to do they close the window
> but it does not stop FOP. Yes I know that I could just kill the Thread but
> there is no fail-safe way to do that. 
> 
> Is there any way that I can tell FOP itself from the Java program that it
> should stop it's processing. I am not worried about keeping stuff that it
> has generated and it will be dropped automatically.
> 
> Any help is great,
> Thanks,
> fletcher111 
> -- 
> View this message in context: http://www.nabble.com/Stopping-FOP-in-Java-tp18578026p18578026.html
> Sent from the FOP - Users mailing list archive at Nabble.com.
> 
> 


Jeremias Maerki


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