[rules-users] error with firing of rules and chainig rules
Giovanni Motta
mottagio at gmail.com
Thu Jun 10 10:24:53 EDT 2010
Hi, i think that if you do:
$sprinkler : Sprinkler(room != "", roomId == $fire.roomId)
that should work.
You should avoid eval and use it just as a last resort.
Regards
2010/6/10 Fnu Mahalakshmi <FMahalakshmi at nyx.com>
> Hi guys,
> Thanks for the response.
> When I store data as a collection the rules don't seem to get fired. I
> think the data is not being read.
> I tried everything suggested.
> So broke down the data storing them as individual java bean objects.
>
> Is this a possibility??
>
> Rule
> When
> $fire : Fire(room != null, status == true)
> $sprinkler : Sprinkler(room != "")
> Eval($sprinkler.getRoomId == $fire.getRoomId) //this doesn't work. Anyway
> I
> can compare 2 values in my
> rules????
>
> Then
> Modify($sprinkler){
> setSprinklerStatus(true);
> }
>
>
>
> I am trying to check if the fire for the room 1 is true then if sprinkler
> for that room exists then that is also set true.
>
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> 1. Re: error with firing of rules and chainig rules (Giovanni Motta)
> 2. Re: depicting array in rules (Swindells, Thomas)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 10 Jun 2010 09:59:27 +0200
> From: Giovanni Motta <mottagio at gmail.com>
> Subject: Re: [rules-users] error with firing of rules and chainig
> rules
> To: Rules Users List <rules-users at lists.jboss.org>
> Message-ID:
> <AANLkTikzwm0qpIv6qDe4koF5NxxFezF3z7op4AIN7yGv at mail.gmail.com>
> Content-Type: text/plain; charset="windows-1252"
>
> When you update your objects, do you notify the session of the change?
> If you do that, you should not take care of salience. The objects insertion
> order is not relevant (or, at least, marginally).
> To notify the session of an object change, you should either put your
> modifications inside a 'modify' block (see the docs) or let your java beans
> include a 'PropertyChangeSupport' field (see dynamic facts).
> In your sample, when the room gets the 'fire' status, the session should be
> notified of the change, and the sprinkler rule will fire.
>
> Regards
>
> 2010/6/9 Fnu Mahalakshmi <FMahalakshmi at nyx.com>
>
> > Hi,
> >
> >
> >
> > If you have multiple rules where its important that rule 1 be fired on
> the
> > data first and then rule 2 how can we do this without specifying the
> > salience factor?
> >
> > I do not want my rules to be dependant on each other as the data I am
> > passing differs from each other.
> >
> > Ex:
> >
> > Room{
> >
> > Name, Id,
> >
> > Status,
> >
> > }
> >
> > Fire{
> >
> > Room,
> >
> > FireType}
> >
> >
> >
> > Sprinkler{
> >
> > Room,
> >
> > SprinklerType
> >
> > status}
> >
> >
> >
> >
> >
> > I pass all data above into my working memory.
> >
> > I have rules:
> >
> > Rule 1: ?if fire exists update room status to ?fire??
> >
> > Rule 2: ?if room has status ?fire? update sprinkler status to ?room
> > number??
> >
> >
> >
> > Now when I pass my javabean objects: if theobject of type sprinkler gets
> > processed first it will never get the room number even if actually the
> room
> > has status ?fire?
> >
> >
> >
> > If I specify salience feature then It will never work for my sprinkler
> > objects and always be multichained.
> >
> > I don?t want chaining between my rules.
> >
> >
> >
> > Any suggestions???
> >
> > Thank you
> >
> > M
> >
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> Message: 2
> Date: Thu, 10 Jun 2010 09:56:34 +0100
> From: "Swindells, Thomas" <TSwindells at nds.com>
> Subject: Re: [rules-users] depicting array in rules
> To: Rules Users List <rules-users at lists.jboss.org>
> Message-ID:
> <DAC86F5F3B84F14088F0DB16092558CA0855AE88EA at UKMA1.UK.NDS.COM>
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>
> Generally the advice when using drools is that if you are wanting to use an
> array (or other type of collection) then you should probably be normalising
> your data and putting the values of the collection into the working memory
> as their own object (pretend that drools is a relational database and follow
> the same rules as you would defining database tables and rows). Sometimes
> you can't do this because of constraints on the environment you are work
> within but in your case you I think you have two options:
>
> Each room conceptually has its own sprinkler therefore each Sprinkler
> object contains a single room field.
> If a Sprinkler has the concept of operating over multiple rooms then have a
> Sprinkler object containing its ID and status, then have multiple
> SprinklerHeadLocation objects containing a reference to the Sprinkler and a
> single room each.
>
>
> Rule " if fire in room start sprinkler if room has sprinkler"
>
> No-loop true
>
> when
>
>
>
> Fire($room : room)
>
> SprinklerHeadLocation(room == $room, $sprinklerId : sprinklerId)
>
> $sprinkler : Sprinkler(sprinklerId == $sprinklerId, status == false)??
>
> then
>
> modify($sprinkler){
>
> setStatus(true)
>
> };
>
> End
>
> Thomas
>
> From: rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] On Behalf Of Esteban Aliverti
> Sent: 09 June 2010 20:28
> To: Rules Users List
> Subject: Re: [rules-users] depicting array in rules
>
> One way could be:
>
> when
>
> Fire($room : room)
> $sprinkler : Sprinkler(room contains $room)
> Room (this == $room, someField == "SomeValue")
> then
> modify($sprinkler){
> setStatus(true)
> };
> End
>
> If you dont have the Room as a Fact Type, then:
>
> when
>
> Fire($room : room)
> $sprinkler : Sprinkler(room contains $room)
> Room (someField == "SomeValue")from $room
> then
> modify($sprinkler){
> setStatus(true)
> };
> End
>
> I'm not 100% sure about this, but at least you can start from here
>
> Best
> 2010/6/9 Fnu Mahalakshmi <FMahalakshmi at nyx.com<mailto:FMahalakshmi at nyx.com
> >>
> Hi,
>
> Is there any way I can represent an array of values in my rules??
> I want to do this:
> Fire{
> Room,
> Status}
> Sprinkler{
> Object [] Room = new Room[]{new Room(),new room()}
> Status
> }
> Room{
> Name,
> Number}
>
> Rule " if fire in room start sprinkler if room has sprinkler"
> No-loop true
> when
>
> Fire($room : room)
> $sprinkler : Sprinkler( room == $room) # how can I search through the
> array of room values here???????
> then
> modify($sprinkler){
> setStatus(true)
> };
> End
>
>
> Any Idea if that is possible to implement in rules???
> I could do it with adding different instances of sprinkler and rooms. But I
> want to minimize the amount of repetition in data stored and loaded into the
> working memory.
>
> Any idea??
> Thank you,
> M
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