[rules-users] Scope of bindings, identical patterns

[Chris Woodrow]

Yes, a single fact will match multiple patterns but you can avoid it (As far
as I remember, it was not the case in v3 and earlier).

You can either specify this in your Java :

RuleBaseConfiguration conf = new RuleBaseConfiguration();
conf.setRemoveIdentities( true );
RuleBase rulebase = new ReteooRuleBase( conf );

Or in your rule :
rule "foo"
   when
      $a : Cheese(name="Stilton")
      $b : Cheese(this != $a, name="Stilton")
   then
      # etc
end

Chris

2007/10/26, Julian Morrison < jmorrison at i-neda.com>:
>
> Suppose I have a rule like:
>
> rule "foo"
>     when
>        $a : Cheese(name="Stilton")
>        $b : Cheese(name="Stilton")
>     then
>        # etc
> end
>
> First question: is it possible that a == b ? In other words, can both
> patterns end up matching the same object in one activation? I have been
> assuming this is so, but it isn't covered in the docs so far as I can see.
>
> Second question: why can't I add as a pattern, $a != $b ? The eclipse
> IDE compiler complains they are undefined. What is the scope of the
> bindings defined by $a and $b ?
>
> --
> Julian Morrison
> Programmer
> i-neda Ltd.
>
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> rules-users at lists.jboss.org
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>
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