There are several ways of doing that, and some where even mentioned by
the other users. One easy way is to simply use "accumulate":
rule "update amount"
no-loop
when
$f : Fact( name == "amount" )
Number( $total : doubleValue ) from accumulate(
Charge( $amt : amount ),
sum( $amt ) )
then
modify( $f ) { setAmount( $total ) }
end
[]s
Edson
2008/11/4 Dan Seaver <dan.seaver(a)ge.com>
I'm trying to find a good technique for updating specific facts in working
memory. What I'm currently doing is something like this:
Rule "Update Amount"
when
amountFact : Fact(name == "Amount")
charge : Charge()
then
Double amount = amountFact.getAmount();
Double chargeAmount = charge.getAmount();
amountFact.setAmount(amount + chargeAmount);
update(amountFact);
end
The update statement causes an infinite loop.
I tried using no-loop, which works if there is 1 charge, but not if there
are more than one.
Any help with solutions or strategies would be much appreciated.
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Edson Tirelli
JBoss Drools Core Development
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