Thomas,
as far as I understood, I don't have to use update(p), to update it :) After using update method, there is infinite loop in my rules (I am talking about DRL).

# this method doesn't change CProduct object
rule "Case A"
salience 1
activation-group "g1"
    when
        p : CProduct( name == "A" )
    then
        System.out.println("Special product: " + p.getName());
end

# this method doesn't change CProduct object
rule "Case B"
salience 1
activation-group "g1"
    when
        p : CProduct( name == "B" )
    then
        System.out.println("Special product: " + p.getName());
end

# this method changes CProduct object
rule "Case general"
salience 0
activation-group "g1"
    when
        p : CProduct(  )
    then
        p.setValue(1000);   # changes object's value
                                    # I don't use update()
        System.out.println("Normal product: " + p.getName());
end

# this method changes CProduct object
rule "New rule"
salience 0          # lower salience
activation-group "g1"
    when
        p : CProduct(  )
    then
        p.setValue(-1);      # I change object's value
                                   # I don't use update()
        System.out.println(p.getName() + " " + p.getValue());   
end

In program, I use StatelessKnowledgeSession and execute method to use rules on CProduct. And.... All normal products (name != A && name != B) have value 1000. Not -1. I don't use update function.

So: I use rules that update my object, but I don't get what am I to watch out... For each object my activation-group fires only one rule. Rule "New rule" never fires.

Thanks,
tom.



2010/7/28 Swindells, Thomas <TSwindells@nds.com>

There are two other solutions if you do need the p:

1.       Change your condition to be “name matches $param”, this will match as a regular expressions. Your general case can then be “.*”.

2.       Merge your  p:CProduct across two columns. Have a condition of “this != $param” for the first column and give all the rows in this column the value of null. Your second column can be name and then be missing in the general clause. For the general clause this will evaluate to:

rule "Case general"
salience 0
activation-group "g1"
    when
        p : CProduct( this != null  )

    then
        System.out.println("Normal product: " + p.getName());
end

which obviously will always evaluate to true for any CProduct.

 

The other general thing you need to watch out for with a spreadsheet of this form is if you have any rules which update CProduct as these rules would then be re-evaluated and re-executed again.  In particular if you have any rules of a lower salience that update the name then the activation group doesn’t stop a different rule from being fired – activation groups are only mutually exclusive at a given point in time when the activation occurs, they don’t prevent different later re-activations.

 

Thomas

 

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Mauricio Salatino
Sent: 28 July 2010 04:58
To: Rules Users List
Subject: Re: [rules-users] General rules in spreadsheet.

 

you can remove p, because in the spreadsheet you are not using it..
in the rules you use p to print the type of the product but in the spreadsheet you are hardcoding the value in the "what to print" column

2010/7/27 tom ska <tiberium.linux@gmail.com>

Hello,
I want to use StatelessSession with spreadsheet. I wrote few rules in DRL, but I cant do it in spreadsheet. First I want to present rules and class that is used by rules:

public class CProduct {

    private String name;
    private int value;

    public CProduct ()
    {
        name = "empty";
        value = 0;
    }
   
    public CProduct (String name, int value)
    {
        this.name = name;
        this.value = value;
    }
       
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getValue() {
        return value;
    }
    public void setValue(int value) {
        this.value = value;
    }   
}

Rules:

rule "Case A"
salience 1
activation-group "g1"
    when
        p : CProduct( name == "A" )
    then
        System.out.println("Special product: " + p.getName());
end

rule "Case B"
salience 1
activation-group "g1"
    when
        p : CProduct( name == "B" )
    then
        System.out.println("Special product: " + p.getName());
end

rule "Case general"
salience 0
activation-group "g1"
    when
        p : CProduct(  )
    then
        System.out.println("Normal product: " + p.getName());
end

Using stateLessSession, salience, and activation-group I can determine, that only one rule is going to be fired for each CProduct. And with salience param, I can determine priority (it is important to get special products first).
Now I am going to write those rules in spreadsheet. But I can't define rule "Case general".

 

CONDITION

ACTION

ACTIVATION-GROUP

PRIORITY

 

p:CProduct

 

 

 

 

name

System.out.println("$param");

 

 

Rules names

Product name

what to print

 

 

Case A

A

Special A

G1

1

Case B

B

Special B

G1

1

General case

normal

G1

0


But when I am going to use the spreadsheet, I get this error:

"p cannot be resolved"

Problem disappears, when I fill "Product name" in "General case".

But I want it to be empty, because I want to fire rule "General case" when rules "Case A" & "Case B" won't fire for any object's name.

Thanks, Tom.



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