RE: [xsl] xslt extensions accessing spring application context

["Robby Pelssers" <robby.pelssers@xxxxxxxxx>]

The main reason why I'm interested in this functionality is

Suppose you have some caching bean class

----------------------------------------------------------------------------
public class CacheImpl implements Cache {

	private TimeConsumingJob job;
	private Map<Map<String, Object>, Result> resultMap;


	public CacheImpl () {
	    this.resultMap = new HashMap<String, Result>();
	}

	public void setTimeConsumingJob (TimeConsumingJob job) {
		this.job = job;
	}

	public TimeConsumingJob getTimeConsumingJob () {
		return this.job;
	}

	public Result getResult (Map<String, Object> parameterMap) {
		if (!resultMap.containsKey(graphicId)) {
			resultMap.put(parameterMap, job.getResult(parameterMap)); //let's assume
job.getResult would take like 1 minute to process
		}
		return resultMap.get(parameterMap);
	}
}

So if we would be able to invoke this bean like:

<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
  xmlns:spring="http://www.springframework.org";
  extension-element-prefixes="spring">

  <xsl:param name="parameterMap"/>

  <xsl:template match="/" >
    <xsl:variable name="result"
select="spring:bean:cacheBean:getResult($parameterMap)"/>  <!--just guessing
what the syntax might become -->
  <xsl:template>
</xsl:stylesheet>

This would save us an enormous amount of time since the bean would check if it
already had a cached result for that combination of parameters.


Kind regards,
Robby Pelssers


-----Original Message-----
From: Michael Kay [mailto:mike@xxxxxxxxxxxx]
Sent: Wednesday, March 10, 2010 1:11 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: RE: [xsl] xslt extensions accessing spring application context

>
> So are you saying that Saxon9.2 would support this feature?

I think it should be possible to make this work under Saxon 9.2, but it's
not something I have done and it would require some investigation or
experiment.

Regards,

Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay


>
> Kind regards,
> Robby
>
> -----Original Message-----
> From: Michael Kay [mailto:mike@xxxxxxxxxxxx]
> Sent: Wednesday, March 10, 2010 12:04 PM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: RE: [xsl] xslt extensions accessing spring
> application context
>
>
> Questions about Java extensibility are processor-specific
> questions that are
> probably best asked on a processor-specific list.
>
> One of the motivations behind the new "integrated extension function"
> mechanism in Saxon 9.2 was to give you better control on how
> your extensions
> integrate into your particular application environment: but I
> haven't worked
> out a Spring example as a specific use case.
>
> Regards,
>
> Michael Kay
> http://www.saxonica.com/
> http://twitter.com/michaelhkay
>
> > -----Original Message-----
> > From: Robby Pelssers [mailto:robby.pelssers@xxxxxxxxx]
> > Sent: 10 March 2010 10:11
> > To: XSLT mailing list
> > Subject: [xsl] xslt extensions accessing spring application context
> >
> >
> > Hi all,
> >
> > I know we can access java classes using extensions... but
> > nowadays many developers use spring to configure beans where
> > properties are configured in the applicationContext.
> >
> > So instead of using the 'new' construct for instantiating a
> > java object I would like to get access to a spring bean.  Are
> > there solutions to accomplish this?
> >
> > Kind regards,
> > Robby Pelssers