As all loop-fighting techniques, it won't handle all situations. Apart
from loops over 2 or more rules, you still can write
$a: Article( $p: price > 1000 ) # slot-specifc on price
then
modify( $a ){ setPrice( $p - 100 ) }
Also, it'll be interesting to see what this will do:
$a: Fact()
$b: Fact( $p: prop == $a.prop ) # slot-specifc on prop
then
modify( $a ){ setProp( $p+1) }
modify( $b ){ setProp( $p+1) }
And so on...
-W
On 8 April 2011 14:17, Michael Anstis <michael.ans...@gmail.com> wrote:
> OK, answers my question :)
>
> It is on the "to do" list already.
>
> On 8 April 2011 13:11, Mark Proctor <mproc...@codehaus.org> wrote:
>>
>> On 08/04/2011 12:39, Geoffrey De Smet wrote:
>> > Related to the modify expression,
>> > I 've always wondered about this code:
>> >
>> > rule "MyRule"
>> > when
>> > $p : Person(name = "Yoda")
>> > then
>> > modify ($p) {
>> > setAge(300)
>> > }
>> > end
>> >
>> > Doesn't this create an infinite loop? (In my experience it does or at
>> > least it takes a lot longer)
>> > Because the modify ($p) schedules any rule using a Person back on the
>> > agenda to be re-evaluated,
>> > so also that rule, which is evaluated and executed again, modifying $p
>> > again, ... hence the infinite loop?
>> It would, unless you have slot specific - which Jess does. Slot specific
>> is something I really want to add, I think it will resolve a lot of
>> recursion problems and make Drools a lot easier to use. I took the slot
>> specific problem and genericsed it further for "slot listeners". I
>> discussed this here:
>> http://blog.athico.com/2010/07/slot-specific-and-refraction.html. I
>> think Laune added some refinements to this in a mailing list entry
>> somewhere.
>>
>> Mark
>>
>>
>>
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>
>
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