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: [email protected]
[mailto:[email protected]] 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 <[email protected]<mailto:[email protected]>>
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.
_______________________________________________
rules-users mailing list
[email protected]<mailto:[email protected]>
https://lists.jboss.org/mailman/listinfo/rules-users
--
- CTO @ http://www.plugtree.com
- MyJourney @ http://salaboy.wordpress.com
- Co-Founder @ http://www.jbug.com.ar
- Salatino "Salaboy" Mauricio -
________________________________
**************************************************************************************
This message is confidential and intended only for the addressee. If you have
received this message in error, please immediately notify the
[email protected] and delete it from your system as well as any copies. The
content of e-mails as well as traffic data may be monitored by NDS for
employment and security purposes. To protect the environment please do not
print this e-mail unless necessary.
NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX,
United Kingdom. A company registered in England and Wales. Registered no.
3080780. VAT no. GB 603 8808 40-00
**************************************************************************************
_______________________________________________
rules-users mailing list
[email protected]
https://lists.jboss.org/mailman/listinfo/rules-users
