Safe to use singleton DocumentBuilderFactory?

[Rick Bullotta <ri...@lighthammer.com>]

It is acceptable/safe to create a single static DocumentBuilderFactory
instance and use it from many threads to create DocumentBuilder instances?

Thanks!

Rick Bullotta
CTO
Lighthammer Software (http://www.lighthammer.com)


-----Original Message-----
From: Pallavi Patil [mailto:pallavipatil_1@yahoo.com] 
Sent: Wednesday, August 25, 2004 2:06 PM
To: xerces-j-user@xml.apache.org
Subject: ref attribute 

Hi,
I want to check if element has ref attribute set or
not, can anyone help me how can I check it? 
Thanks.



		
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Re: Safe to use singleton DocumentBuilderFactory?

[Michael Glavassevich <mr...@ca.ibm.com>]

Hello Rick,

Instances of javax.xml.parsers.DocumentBuilderFactory [1] are not 
guaranteed to be thread-safe, so accessing an instance of this class 
across multiple threads should be synchronized by your application. The 
javadoc for DocumentBuilderFactory states that: "an application can use 
the same instance of the factory to obtain one or more instances of the 
DocumentBuilder provided the instance of the factory isn't being used in 
more than one thread at a time". Unless you're doing something strange 
like modifying the configuration of the factory while a DocumentBuilder is 
being instantiated on another thread, I don't think you'd run into 
problems with the current implementation in Xerces, but you can't count on 
that since DocumentBuilderFactory makes no guarantees.

[1] http://java.sun.com/j2se/1.4
.2/docs/api/javax/xml/parsers/DocumentBuilderFactory.html

"Rick Bullotta" <ri...@lighthammer.com> wrote on 08/25/2004 
04:36:04 PM:

> It is acceptable/safe to create a single static DocumentBuilderFactory
> instance and use it from many threads to create DocumentBuilder 
instances?
> 
> Thanks!
> 
> Rick Bullotta
> CTO
> Lighthammer Software (http://www.lighthammer.com)
> 
> 
> -----Original Message-----
> From: Pallavi Patil [mailto:pallavipatil_1@yahoo.com] 
> Sent: Wednesday, August 25, 2004 2:06 PM
> To: xerces-j-user@xml.apache.org
> Subject: ref attribute 
> 
> Hi,
> I want to check if element has ref attribute set or
> not, can anyone help me how can I check it? 
> Thanks.
> 
> 
> 
> 
> _______________________________
> Do you Yahoo!?
> Win 1 of 4,000 free domain names from Yahoo! Enter now.
> http://promotions.yahoo.com/goldrush
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: xerces-j-user-unsubscribe@xml.apache.org
> For additional commands, e-mail: xerces-j-user-help@xml.apache.org
> 
> 
> 
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> 

Michael Glavassevich
XML Parser Development
IBM Toronto Lab
E-mail: mrglavas@ca.ibm.com
E-mail: mrglavas@apache.org