Two of the classes mentioned, XMLReaderFactory and SerializerFactory,
aren't in JAXP: any reason why you're not writing pure JAXP code?
The XMLReader and the TransformerHandlers are serially reusable but not
multithreaded. It's generally best to create a new instance of these
classes for each transformation, if only to be sure of clearing out
unwanted data in memory. The important object to reuse is the Templates
object.
Michael Kay
Software AG
home: Michael(_dot_)H(_dot_)Kay(_at_)ntlworld(_dot_)com
work: Michael(_dot_)Kay(_at_)softwareag(_dot_)com
-----Original Message-----
From: owner-xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
[mailto:owner-xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com] On Behalf Of
Varley, Roger
Sent: 10 December 2002 13:01
To: 'xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com'
Subject: RE: [xsl] Chaining Transformers/Templates
The reason that I want to to use Templates is that I
will have a large number of threads performing a
transormations using two standard XSL stylesheets so I want
to avoid the overhead of re-processing the transform
instructions every time.
Thanks to Micheal Kays response I now have the following code
running and working in the processing threads.
TransformerFactory tFactory =
TransformerFactory.newInstance();
SAXTransformerFactory saxFactory =
(SAXTransformerFactory) tFactory;
TransformerHandler standardTH =
saxFactory.newTransformerHandler(standardTemplate);
TransformerHandler recipientTH =
saxFactory.newTransformerHandler(recipientTemplate);
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setContentHandler(standardTH);
standardTH.setResult(new SAXResult(recipientTH));
Serializer serializer =
SerializerFactory.getSerializer(OutputProperties.getDefaultMet
hodProperties(
"xml"));
serializer.setOutputStream(new
FileOutputStream(incomingPath + "result.xml"));
recipientTH.setResult(new
SAXResult(serializer.asContentHandler()));
The template objects are created by an external singleton
class called by the processing thread. The singleton class has to call
TransformerFactory.newInstance() to create the template, so
I'm now wondering how much of the above code I can move to my
external singleton class and still remain threadsafe. For
example, could I go as far as moving all this code to my
external class so that the XMLReader is only built once and
return the XMLReader object to every thread that asks for it.
The thread then builds the input for the XMLReader and then
calls XMLReader.parse().
Regards
Roger
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list