[rules-users] error with firing of rules and chainig rules
Fnu Mahalakshmi
FMahalakshmi at nyx.com
Thu Jun 10 09:32:38 EDT 2010
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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Today's Topics:
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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