[rules-users] Discover when a rule isn't more active

[Claudio Rainoldi]

thanks a lot

2008/7/29, Ingomar Otter <iotter at mac.com>:
>
> There is a mechanism called truth maintenance ensuring for example
>
> A -> B
> B -> C
>
> that C becomes false when it's premise (B) becomes false as well.
> What it basically does it track the LHS side of the rule and undoes
> asserted facts when there are no more "facts" to support it (activate the
> rules in question).
> Look at the documentation for logicals / truth mainteance. It's pretty
> cool.
>
> For your case:
>
> rule "light2on"
> when
>        LIght(name=="0/0/2", actualvalue=="1")
> then
>      insertLogical( new LightIsOn(2))
> end
>
> the fact "LightIsOn" will only be true (in the working memory) as long as
> the LHS of the rule above is still true. For example if acutalvalue becomes
> 0, that fact would vanish automagically.
> That implies that you use facts to make statements about your system (not
> using behind the scene callbacks) - but from my very little experience I
> would say this is a good practice anyway. Fiddeling with activations make me
> suspicious ;-) - But then it all depends on your particular problem at hand.
>
> --I
>
>
>  rule "light 2 on"
>>>> dialect "java"
>>>> when
>>>> Light (name=="0/0/2", actualvalue=="1");
>>>> then
>>>> System.out.println("luce 2 on");
>>>> end
>>>>
>>>
>
> Am 29.07.2008 um 14:42 schrieb Claudio Rainoldi:
>
> i'm sorry i'm a new drools user.. Can you try to be a little more clear?
>> thanks..
>>
>>
>> 2008/7/29, Ingomar Otter <iotter at mac.com>:
>>
>>>
>>> Use logicals.
>>>
>>> Am 29.07.2008 um 11:20 schrieb Claudio Rainoldi:
>>>
>>> Hi everyone,
>>>
>>>> isn'it there a way to find when a rule isn't more active.
>>>> For example if i have this rule:
>>>>
>>>>
>>>> rule "light 2 on"
>>>> dialect "java"
>>>> when
>>>> Light (name=="0/0/2", actualvalue=="1");
>>>> then
>>>> System.out.println("luce 2 on");
>>>> end
>>>>
>>>>
>>>> when someone turn on the light 2 i discover that the rule is fired using
>>>> an
>>>> Agenda Event Listener and the method afterActivationFired;
>>>> But when someone turn off the ligth isn't there a similar way to
>>>> discover
>>>> that the rule "light 2 on" isn't more active.
>>>> My only solution is to use the dual rule:
>>>>
>>>> rule "light 2 on_dual"
>>>> dialect "java"
>>>> when
>>>> not (Light (name=="0/0/2", actualvalue=="1"));
>>>> then
>>>> System.out.println("luce 2 off");
>>>> end
>>>>
>>>> Isn't there a more sample way to do this?
>>>> Thanks in advance.
>>>>
>>>>
>>>> Cla
>>>> _______________________________________________
>>>> rules-users mailing list
>>>> rules-users at lists.jboss.org
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20080729/95fd8cb5/attachment.html