11:20 a.m.
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
11:27 a.m.
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
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2:42 p.m.
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(a)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(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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3:08 p.m.
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(a)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(a)lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
4:01 p.m.
thanks a lot
2008/7/29, Ingomar Otter <iotter(a)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(a)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(a)lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users(a)lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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4:05 p.m.
The same interface you are using (AgendaEventListener) has 2 methods for
activations created and canceled:
void activationCreated(ActivationCreatedEvent event,
WorkingMemory workingMemory);
void activationCancelled(ActivationCancelledEvent event,
WorkingMemory workingMemory);
[]s
Edson
2008/7/29 Claudio Rainoldi <claudio.rainoldi(a)gmail.com>
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(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
8:59 p.m.
Yes i know this. I've tried to use activationCancelled method to
discover when a rule isn't more true but it doesn't work. The code was
public static class FiredRulesListener extends
DefaultAgendaEventListener static class FiredRulesListener extends
DefaultAgendaEventListener
{
List<Rule> firedRules = new ArrayList<Rule>();
public List<Rule> getFiredRules() List<Rule> getFiredRules()
{return this.firedRules;}
@Override
publicvoid afterActivationFired(AfterActivationFiredEvent event,
WorkingMemory workingMemory)
{Rule rule = event.getActivation().getRule();
if (!this.firedRules.contains(rule)) this.firedRules.add(rule);
(!this.firedRules.contains(rule)) this.firedRules.add(rule);
}
@Override
public void activationCancelled (ActivationCancelledEvent event,
WorkingMemory workingMemory)
{
System.out.println("i never see this message");
Rule rule= event.getActivation().getRule();
this.firedRules.remove(rule);
}
but when i turn off the ligth the method activationCancelled wasn't
never called
2008/7/29, Edson Tirelli <tirelli(a)post.com>:
The same interface you are using (AgendaEventListener) has 2 methods for activations
created and canceled:
void activationCreated(ActivationCreatedEvent event,
WorkingMemory workingMemory);
void activationCancelled(ActivationCancelledEvent event,
WorkingMemory workingMemory);
[]s
Edson
2008/7/29 Claudio Rainoldi <claudio.rainoldi(a)gmail.com>
>
>
> 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(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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4:12 p.m.
Sorry I replied to the wrong message, doh! So here it is again.
I've thought about some callback mechanism that is executed when a rule
is no longer true, the problem I have is which variable changed to make
the rule no longer true and how do I expose the bound variables to the
user, especially if the rule is no longer true due to a retraction, and
ofcourse I need to figure our the DRL syntax that makes sense.
I've thought about doing it as a sort of logical closure, so you have to
declare the data:
insertLogicalClosure( new LogicalClosure() {
execute() {.......}
} )
Not sure how to make the data accessible, maybe the user should have to
populate the map. Anyway idea is in the same way that a logical insert
is executed when the rule is true, the logical closure/method is executed.
So if someone has some time and fun, maybe they would work on this and
submit a patch :)
Claudio Rainoldi wrote:
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
------------------------------------------------------------------------
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5749
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7 comments
4 participants
participants (4)
-
Claudio Rainoldi -
Edson Tirelli -
Ingomar Otter -
Mark Proctor