 | | | Templates/Transformers + thread safety??? | Templates/Transformers + thread safety??? 2007-02-28 - By Tom Fennelly
Done:
https://issues.apache.org/jira/browse/XALANJ-2371
Erin Harris wrote:
>
> Hi Tom,
>
> I can't see anything wrong with your code so it looks like a bug.
> Please open a JIRA issue here:
> https://issues.apache.org/jira/browse/XALANJ
>
> Thanks.
>
> Erin Harris
>
>
>
>
> *Tom Fennelly <tom.fennelly@(protected)>*
>
> 28/02/2007 10:22 AM
>
>
> To
> Erin Harris/Toronto/IBM@(protected)
> cc
> xalan-j-users@(protected)
> Subject
> Re: Templates/Transformers + thread safety???
>
>
>
>
>
>
>
>
>
> Hi Erin.
>
> I spotted it initially on a dual core (Dell D820), but I've also run and
> reproduced it on a single processor machine (I just verified this again
> before replying).
>
> What are you think? Some sort of shared memory issue or something? Is
> it something I'm doing do you think?
>
> T.
>
>
> Erin Harris wrote:
> >
> > Hi Tom,
> >
> > I couldn't reproduce the problem using Stream and Xalan 2.7.0 but I
> > could reproduce it using DOM. Are you on a multiprocessor machine or a
> > single processor machine?
> >
> > Thanks.
> >
> > Erin Harris
> >
> >
> >
> >
> > *Tom Fennelly <tom.fennelly@(protected)>*
> >
> > 27/02/2007 10:23 AM
> >
> >
> > To
> > Erin Harris/Toronto/IBM@(protected)
> > cc
> > xalan-j-users@(protected)
> > Subject
> > Re: Templates/Transformers + thread safety???
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Thanks Erin.
> >
> > I've updated that test download to include testing against stream
> > source/result instances. Still getting unexpected results on these
> > (stream source/result) when not synschronizing on the template
> > instance. Zip available at
> > http://milyn.codehaus.org/xalan/xalan-test-v2.zip (zip also includes the
> > milyn jar).
> >
> > Thanks again Erin.
> >
> > Regards,
> >
> > Tom.
> >
> >
> > Erin Harris wrote:
> > >
> > > Hi Tom,
> > >
> > > I couldn't run your test case as I don't have the milyn classes. Have
> > > you tried using StreamSource and StreamResult to see if you get the
> > > same problem?
> > >
> > > Thanks.
> > >
> > >
> > > Erin Harris
> > >
> > >
> > >
> > >
> > > *Tom Fennelly <tom.fennelly@(protected)>*
> > >
> > > 26/02/2007 02:29 PM
> > >
> > >
> > > To
> > > xalan-j-users@(protected)
> > > cc
> > >
> > > Subject
> > > Templates/Transformers + thread safety???
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Hi.
> > >
> > > While running some tests I noticed something strange - applying
> > > transformations concurrently + unsynchronized using the same template
> > > instance *appears* to be yielding unexpected results i.e. if I
> > > synchronize transformations across the threads (synchronize on the
> > > template instance) I have no issues. I'm quite sure I'm doing
> > > something wrong here but haven't found the answer.
> > >
> > > I packaged up the test in a maven2 project
> > > (_http://milyn.codehaus.org/xalan/xalan-test.zip_). If you run the
> > > junit test from the download you'll not see any errors because the
> > > transform step is synchronized on the template instance
> > > (XsltConcurrentTest.java, line 168). If you remove the
> > > synchronization, you start getting errors.
> > >
> > > My understanding was that I should be able to load a stylesheet into a
> > > single instance of javax.xml.transform.Templates and then, on each
> > > Thread, create and use new Transformer instance through a call to
> > > Templates.newTransformer().transform(...). Is this wrong??
> > >
> > > Environment:
> > >
> > > * Windows XP
> > > * jdk1.5.0_10
> > > * Xalan 2.7.0
> > > * Xerces 2.7.1
> > > * xml-apis 1.3.02
> > >
> > > I have taken a look around for an answer to this, but I fear that it
> > > may be something silly I'm doing, so I apologize in advance :-[
> > >
> > > Regards,
> > >
> > > Tom.
> >
>
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