Re: [rules-users] Efficiency of rules with XPath...
Maybe you should look at this below
/Tomas
-------- Original Message --------
Subject: XPath and JBoss Rules integration with SXC
Date: Mon, 02 Apr 2007 00:14:22 GMT
From: <Mark Proctor>
SCX (Simple XML Compiler)
SXC has just been released and is a must have for any SOA project -
http://sxc.codehaus.org/ - best of all it comes with JBoss Rules
integration :) SXC is a pluggeable XML compiler that provides a high
performance streaming XPath parser with JBoss Rules integration. It
allows you to specify XPath querries in your rules, as the XML is parsed
those rules are then applied, you do not need to write additional XPath
statements else where.
rule "AddresTest"
when
event : XPathEvent( expression == "/order/address[@country]" );
then
System.out.println("Success! - " + drools.getRule().getName());
end
Schwenker, Stephen wrote:
Hey all,
I'm trying to make my rule more efficient but I'm not sure how. I've
designed my rules based around xml objects. Basically, I have these
documents and XPath queries are executed against the Object to
determine if the rule should be executed. The problems is, is that we
have over 900 rules that need to be executed. The performance isn't
really that bad but I would like to Make it even better.
To do the job, I have written an XmlUtils class to execute the
expression. The class first gets the XPathFactory. Then compiles the
expression and then executes the expression. This happens for every
expression, and will happen each time the same expression is
executed. I want to make the rules more efficient by getting the
XPathFactory once and compiling the expression once and then execute
the expression n time on the same compiled object.
I would like to know if there is a way I can have the rule object that
is generated by the package build do the compile of the XPath
Expression and then use it instead of compiling it every time.
Here is a sample of one of my rule criteria.
asset: AssetDocument()
* eval*( XmlUtils.evaluatePathBoolean( asset,
"boolean(//ass:asset/ass:properties/ass:property[@name =
'Desk']/ass:value/text() = 'column')") )
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