Re: [rules-users] Chart notation, update, and infinite loops
1) Do you want to apply all Charges in working memory to all "Amount" Facts? I
ask because the rule is a cartesian join (i.e. no relation between matched objects) and
that sometimes performs in ways users don't expect. (i.e. all combinations of objects
that match the conditions are affected by the rule)
2) Can you add a property to the Charge object? Then you could use a boolean named
"applied" to prevent future matches.
Rule "Update Amount"
when
amountFact : Fact(name == "Amount")
charge : Charge(applied == false)
then
Double amount = amountFact.getAmount();
Double chargeAmount = charge.getAmount();
amountFact.setAmount(amount + chargeAmount);
update(amountFact);
charge.setApplied(true);
update(charge);
end
If a charge could be applied to multiple Facts you could maintain an "appliedTo"
list of Facts in the Charge, and check that instead of a simple boolean.
--- On Tue, 11/4/08, Dan Seaver <dan.seaver(a)ge.com> wrote:
From: Dan Seaver <dan.seaver(a)ge.com>
Subject: [rules-users] Chart notation, update, and infinite loops
To: rules-users(a)lists.jboss.org
Date: Tuesday, November 4, 2008, 11:50 AM
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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