[rules-users] RE: Why not retracting?

[Anstis, Michael (M.)]

By way of an update; if the retraction is made within a different Agenda
Group the rules work as expected.

However the problem of the retraction having no obvious affect when
operated within the same Agenda Group remains.

Is this a bug?

> _____________________________________________ 
> From: 	Anstis, Michael (M.)  
> Sent:	26 January 2007 11:32
> To:	'Rules Users List'
> Subject:	Why not retracting?
> 
> Hello,
> 
> I have the following rules; one removes "Prices" that do not have the
> required "Economic Level" from working memory, the other calculates a
> "Costs":-
> 
> 	rule "Cost - remove prices that do not have the required
> 'Economic Level'"
> 	agenda-group "stamping-costs"
> 	//salience 1
> 	when
> 		p : Price ( economicLevel != ( Utilities.makeDate(1, 1,
> 2007) ) )
> 	then
> 		System.out.println("Retracting "+p.toString());
> 		retract(p);
> 	end
> 
> 	rule "Cost - calculate cost for 'Stamping process' on a process"
> 	agenda-group "stamping-costs"
> 	//salience 2
> 	when
> 		r : ResourceEntry ( m : machine )
> 		//p : Price ( economicLevel == ( Utilities.makeDate(1,
> 1, 2007) ), machine == ( m ) )
> 		p : Price ( machine == ( m ) )
> 	then
> 		Cost cost = new Cost(r, p);
> 		cost.setCost((float) (r.getUsage() * p.getRate()));
> 		assert(cost);
> 	end
> 
> The problem is that the "Cost" rule still works upon ALL "Prices"
> (even those with an incorrect "Economic Level").
> 
> If I change the line in the "Cost" rule to also check the "Economic
> Level" the rules work as expected (i.e. "Costs" are only calculated
> using "Prices" with an "Economic Level" of 01/01/2007).
> 
> I've tried using "salience" levels too (as commented in the above
> Rules) but this doesn't have any effect either.
> 
> What am I doing wrong?
> 
> Cheers,
> 
> Mike
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