[jdom-interest] Using XPath in Multi-Threaded Env

[Rajan Gupta]

Jason,
I want to use XPath once constructed with different DOM Documents
essentially pre-compile & store for reuse. I believe it is possible, 
but in your XPath code, you are storing the passed element to
selectSingleNode() method in a private attribute called context.
Can u please shed some light, on reusing XPath across DOM Documents 
in a multi-threaded env.

Thanks in advance.
Rajan Gupta
--- Rajan Gupta <rgupta99_1999 at yahoo.com> wrote:
> Thanks for the response. 
> But if were to use XPath is a threaded environment, we are assuming that
> in the future the XPath code will not be changed to start using context
> in
> some other way?
> Do u have an insight into why Jason Hunter is storing context in a
> private
> variable?
> 
> Thanks again
> Rajan
> --- Laurent Bihanic <laurent.bihanic at atosorigin.com> wrote:
> > 
> > Rajan Gupta wrote:
> >  > Is it possible to reuse an instance of XPath across multiple
> threads
> > of
> >  > execution using different instances of DOM Documents in each
> thread?
> > 
> > Yes and no!
> > 
> > No because, as no JDOM object is threadsafe, XPath was not designed to
> > be 
> > threadsafe. For JaxenXPath to be threadsafe, context should be made a
> > thread 
> > local variable.
> > 
> > Yes because I do it all the time and it works. For that, you should
> not
> > rely 
> > on the automatic context-based namespace prefix resolution feature.
> > Which mean 
> > you should define all namespace prefix mappings using
> > XPath.addNamespace().
> > 
> > Laurent
> > 
> 
> 
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