It's worth thinking about it differently. A rule does not fail. It just defines
the conditions under which it will activate.
If you wish to perform an action whether the condition is true or false, you
have 2 options:
A positive and a negative condition:
when
test(a == "b")
then
...
when
test(a != "b")
then
…
A condition which is always true:
when
test()
then
if (a.equals("b")) {
...
} else {
...
}
To be honest whether you write 1 or 2 rules should not be a 'business'
decision. Why does anybody think there should not be 2 rules?
It's probably worth considering what you're trying to achieve. Does logging of
a fact value really need to be part of a rule?
For instance, if you're actually just looking for an audit trail, you can have
a WorkingMemoryEventListener, which can listen for all of the fact insertions,
updates and retractions. It can log them all as they happen. Combined with an
AgendaEventListener, you can log what rules have activated and what the values
of facts were at the time. Use an asynchronous logger and this will have very
little impact on rules processing performance.
Alternatively if the business are writing rules, and only wish to write the
positive match, then maybe you can create a DSL which generates the both the
positive and negative rules behind the scenes.
A few ideas there for you to try...
Steve
On 17 Aug 2012, at 15:49, Rana <ven12...@yahoo.com> wrote:
> That's what our Business doesn't want me to do to write negative rules. In
> this way there will be 2 rules to be written for 1 business rule.
>
> Thanks.
>
>
>
> --
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