[rules-users] Does Session effeciently filter unused facts, or...

[Greg Barton]

Well, I was about to say "you could do this using rule inheritance" but there is a caveat, and possibly a bug.  It almost works. :)

Try this:

rule "BaseStream1Criteria"
	enabled false
	when
		m : Message( foo == "BAR" ) from entry-point "Stream1"
	then
		System.out.println( "BaseStream1Criteria" );
end

rule "SubRule1" extends "BaseStream1Criteria"
	when
		Message( status == Message.HELLO ) from m;
	then
		System.out.println( "SubRule1 " );
end

rule "BaseStream2Criteria"
	enabled false
	when
		m : Message( foo == "BAS" ) from entry-point "Stream2"
	then
		System.out.println( "BaseStream2Criteria" );
end

rule "SubRule2" extends "BaseStream2Criteria"
	when
		Message( status == Message.HELLO ) from m;
	then
		System.out.println( "SubRule2 " );
end

Basically, define one rule for each entry point that has the global criteria for that entry point.  Then extend that rule.

The caveat is that it seems you can't use the events matched in the super-rule in the RHS of the subrule. (Try putting the object "m" matched into the action of either of the subrules.  It neither validates in eclipse nor compiles at runtime, drools 5.0.1.)  If this isn't fixed in trunk (I can't check at the moment) I'll open a jira.

Code attached.  When you run it, this should be the output:

SubRule2 
SubRule1

--- On Mon, 11/23/09, Barry Kaplan <groups1 at memelet.com> wrote:

> From: Barry Kaplan <groups1 at memelet.com>
> Subject: [rules-users]  Does Session effeciently filter unused facts, or...
> To: rules-users at lists.jboss.org
> Date: Monday, November 23, 2009, 9:12 PM
> 
> ... should I put a filter before insert(). 
> 
> I will have lots of events coming from hardware devices,
> only some of which
> be applicable to a given session instance. I've tried
> extracting the
> declared types from the packages, but that doesn't include
> classes used in
> patterns which where only imported. So determine the actual
> set of event
> classes used by a given set of packages seems not to be so
> easy.
> 
> I've drilled down to EntryPointNode.assertObject......
> -- 
> View this message in context: http://old.nabble.com/Does-Session-effeciently-filter-unused-facts%2C-or...-tp26489782p26489782.html
> Sent from the drools - user mailing list archive at
> Nabble.com.
> 
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
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>


      
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