[rules-users] Predicate expression effect on performance

[Michael Neale]

In a sense, yes - but its the result of the comparison that is "cached"
really.

In the case you described, it is subrule generation. So either side of the
"or" is like a separate rule.
In version 3, the result of isSameAmount (ie if it was true or false) is
"cached".

Things will only be re-checked if the "Check" fact changes (and the engine
knows about the change).

Note that this checking happens as you are asserting objects, not when you
"fireAllRules" necessarily.

On 7/20/07, Yuri de Wit <ydewit at gmail.com> wrote:
>
> What is the extent of the performance impact caused by using predicate
> expressions?
>
> Check( amount == $amount )
> or
> Check( $amt : amount -> (isSameAmount($amt, $amount) )
>
> My understanding is that once asserted the amount property will be
> "cached" in the shadow fact, is the result of isSameAmount(...) also
> cached?
>
> thanks,
>
> -- yuri
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