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

RE: String interning (WAS: SAX2/Java: Towards a final form)

  • From: Miles Sabin <msabin@c...>
  • To: xml-dev-digest@i...
  • Date: Thu, 13 Jan 2000 10:57:11 -0000

RE: String interning (WAS: SAX2/Java: Towards a final form)
David Brownell wrote,
> So Miles, if you prefer the occasional synchronization issue
> to the routine method invocation overhead, use a parser that
> obliges you.  (Yes, I'm assuming SAX2 doesn't mandate any
> interning, just exposes whether or not it's done.)

Well, if your assumption is correct, then fine. But I rather
got the impression that some people wanted SAX2 to make
guarantees about Strings being returned java-interned.

> Though I daresay you'll find that the synchronization isn't
> usually measurable, while your evidently preferred 
> alternative (lots of String.equals calls) will consistently 
> show up as a performance problem.  At least that's been the 
> case when I've made such measurements.

Except that String.intern() isn't the _only_ way of making
foo.equals(bar) iff foo == bar (in particular contexts, as
opposed to across the whole JVM).

I use thread-local app-interning and ==, or no interning at all 
and String.equals() ... as Arkin noted the overhead in the 
latter case isn't too bad with a decent JIT.



Miles Sabin                       Cromwell Media
Internet Systems Architect        5/6 Glenthorne Mews
+44 (0)20 8817 4030               London, W6 0LJ, England
msabin@c...          http://www.cromwellmedia.com/

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i...
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ or CD-ROM/ISBN 981-02-3594-1
Please note: New list subscriptions now closed in preparation for transfer to OASIS.


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.