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From "Denis Bohm" <de...@fireflydesign.com>
Subject Re: JSVGComponent dynamic DOM update, invokeAndWait threading issue
Date Wed, 01 Oct 2003 02:59:33 GMT
I'm having a problem reloading a document.  The first time I try to reload I
just get a blank page, on the second try to reload it seems to work.  But
sometimes on the second reload I get:

java.lang.IllegalStateException: RunnableQueue not started or has exited
        at
org.apache.batik.util.RunnableQueue.invokeAndWait(RunnableQueue.java:257)
        at
com.fireflydesign.svg.SVGStage$AnimationTimer.run(SVGStage.java:639)

and things don't function anymore.

I assume that I need to shut somethings down before changing the document?
Is that what you are referring to when you say "don't load new SVG documents
until pending DOM updates"?

Thanks,
  Denis

----- Original Message ----- 
From: "George Armhold" <armhold@cs.rutgers.edu>
To: "Batik Users" <batik-users@xml.apache.org>
Sent: Monday, September 29, 2003 12:29 PM
Subject: Re: JSVGComponent dynamic DOM update, invokeAndWait threading issue


> Sorry for the late reply to this thread; I was travelling when your
> reply came in.
>
> Thomas DeWeese wrote:
>
>  >> So now my question is: how can I know when it's safe to call
>  >>    UpdateManager um = getUpdateManager();
>  >>    RunnableQueue rq = um.getUpdateRunnableQueue();
>  >>
>  >> and add things to the RunnableQueue?
>  >
>  >
>  >   It is safe after the first GVT rendering completes.  This is
>  > _before_ the managerStarted call back, so this shouldn't be the
>  > problem.  You should have enough instrumentation in your code now to
>  > figure out what the sequence of events is that leads to the Null
>  > UpdateManager is.
>
> Indeed, thanks to your help.  It seems there were two key issues in my
> code:
>
> - make sure sure UpdateManager is available (wait until
>    gvtRenderingCompleted event) before starting DOM updates.
>
> - don't load new SVG documents until pending DOM updates
>    (UpdateManager's RunnableQueue) to the currently loaded doc have
>    completed.
>
>
> Although I need to complete more testing, I have not seen any more
> crashes since applying these two fixes.  Thanks!
>
>
> --
> George Armhold
> Rutgers University
> eLearning Grant, DCIS
>
>
>
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