[rules-users] Fetching values of an object's attribute set bydifferent rules

[Anstis, Michael (M.)]

Hi psentosa,

I don't fully understand what you require, but won't using a List of
WashRuleMatches provide what you need?

rule A
when
      $s : Shirt (dirtinessLevel == high)
      $holder : WashRuleValueHolder()
Then
	System.out.println ("this cloth should be washed in 60 degree
water with 1 spoon of detergent")
	WashRuleMatch m = new WashRuleMatch();
	m.setTemperature(60);
	m.setDetergent(1);
	m.setShirt($s);
	$holder.add(m);
	//insertLogical(m);

rule B
when
     $s : Shirt(material == satin)
     $holder : WashRuleValueHolder()
then
	System.out.println ("this cloth should be washed in 30 degree
water with 0,5 spoon of detergent")
	WashRuleMatch m = new WashRuleMatch();
	m.setTemperature(30);
	m.setDetergent(0.5);
	m.setShirt($s);
	$holder.add(m);
	//insertLogical(m);

Do you need only one WashRuleValueHolder for each shirt?

[WashRuleValueHolder setup by rules]

rule A1.0
when
      $s : Shirt (dirtinessLevel == high)
      not WashRuleValueHolder(shirt == $s)
Then
	WashRuleValueHolder wrvh = new WashRuleValueHolder($s);
	insertLogical(wrvh);

rule A1.1
when
      $s : Shirt (dirtinessLevel == high)
      $holder : WashRuleValueHolder(shirt == $s)
Then
	System.out.println ("this cloth should be washed in 60 degree
water with 1 spoon of detergent")
	WashRuleMatch m = new WashRuleMatch();
	m.setTemperature(60);
	m.setDetergent(1);
	m.setShirt($s);
	$holder.add(m);
	//insertLogical(m);

Etc...

With kind regards,

Mike

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of psentosa
Sent: 11 August 2008 10:04
To: rules-users at lists.jboss.org
Subject: [rules-users] Fetching values of an object's attribute set
bydifferent rules


Hi, 

I have the following problems:
I need to prove an object based on certain rules, where the parts of the
rules should be kept to be used in further process within my
application.
In order to fetch those parts, my idea was to insert an additional
object as
value holder for the rule's parts,
put values on them when the corresponding rule is fired, so that later
on I
can process those value holder after my appl gets the control back from
Ruleengine.


The example below:

Shirt shirt = new Shirt(...)
WashRuleValueHolder holder = new WashRuleValueHolder();

session.insert(shirt);
session.insert(holder);
......

session.dispose()

System.out.println(holder.getTemperature());
System.out.println(holder.getDetergent());
=======================

rule A
when
      Shirt (dirtinessLevel == high)
      $holder : WashRuleValueHolder()
then
      System.out.println ("this cloth should be washed in 60 degree
water
with 1 spoon of detergent")
     $holder.temperature = 60;
     $holder.detergent = 1;

rule B
when
     Shirt(material == satin)
     $holder : WashRuleValueHolder()
then
       System.out.println ("this cloth should be washed in 30 degree
water
with 0,5 spoon of detergent")
     $holder.temperature = 30;
     $holder.detergent = 0,5;

Now, in case both rules evaluate to true, I'd have problem with my
valueholder, bcs depending on which one of the rules was fired latest,
that'd be the value I got from the holder, and I need both of them.
So, my questions:

- Is using such a value holder a good solution to fetch the rules'
value? Or
is there any better solution?
- How to handle this problem of multiple value association to the
holder, so
I still can get all the values without one overwriting the other and
they
are still connected?

Any idea highly appreciated, thanks in advance!



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