[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: SAX and parallel processing

bob gutierrez
* Bob Foster <bob@o...> [2004-12-31 19:37]:
> Bob
> Alan Gutierrez wrote:
> > * Bob Foster <bob@o...> [2004-12-31 18:03]:
> >>I have a question, though. What is the guaranteed lifetime of an object
> >>appearing in a SAX event, like an Attributes object, and any objects
> >>used to implement it? If, for example, Attributes were implemented as a
> >>collection of lightweight Attribute objects that were re-used for
> >>subsequent events, the event data could not be passed directly to
> >>parallel threads without copying it. (Or by joining at the end of every
> >>event, which would rather limit the parallelism.)
> >
> >
> >
> >     Xerces recycles Attributes structures for each call to
> >     startElement.

> >     In my library, I keep a stack of attribute structures. The
> >     attribute structures on the stack are recycled for each element
> >     depth, not actually popped and reallocated.

> Right. In order to process a SAX stream in parallel you have to
> copy the data in the stream, you can't just "forward" the events.
> You also have to instantiate a context for each event, including
> at least the namespaces in scope, the Location info. I didn't mean
> to imply this would be excessively expensive, just not as
> lightweight as serially processed SAX.

    Wasn't out to school you, so much as to relate my experience.


Alan Gutierrez - alan@e...


Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!

Buy Stylus Studio Now

Download The World's Best XML IDE!

Accelerate XML development with our award-winning XML IDE - Download a free trial today!

Don't miss another message! Subscribe to this list today.
First Name
Last Name
Subscribe in XML format
RSS 2.0
Atom 0.3

Stylus Studio has published XML-DEV in RSS and ATOM formats, enabling users to easily subcribe to the list from their preferred news reader application.

Stylus Studio Sponsored Links are added links designed to provide related and additional information to the visitors of this website. they were not included by the author in the initial post. To view the content without the Sponsor Links please click here.

Site Map | Privacy Policy | Terms of Use | Trademarks
Free Stylus Studio XML Training:
W3C Member
Stylus Studio® and DataDirect XQuery ™are products from DataDirect Technologies, is a registered trademark of Progress Software Corporation, in the U.S. and other countries. © 2004-2013 All Rights Reserved.