4:33 a.m.
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(a)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<mailto: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<http://this.name> = name;
this.value = value;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name<http://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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