Nothing out-of-the-box afaik.

Take a look at dynamic salience expressions - http://blog.athico.com/2007/05/dynamic-salience-expressions.html
Also note that dynamic salience can also be determined with a function call, for example:

package com.sample
public class MyClass {
...
   public static int uniqueSalience(String ruleflowGroup) {
        // return and maintain unique salience contract ..implement yourself
    }
...
}

and in your drl for example:

package com.sample
import function com.sample.MyClass.uniqueSalience;

rule "testrule"
    ruleflow-group "abc"
    salience (uniqueSalience("abc"))
when
   ...
then
   ...
end

Hope this helps some.

Thanks.
Tihomir

Is it possible in Drools to enforce a unique salience?

Ideally this would be done at the point of entering a new rule.

For example, if a rule existed with salience of 17 and a user tried to add a
new rule of salience 17, an error message would be generated saying
'salience level already in use'.

Even better would be the ability to enforce a unique salience for rules
belonging to a particular ruleflow-group.

The reason for wanting to achieve this is to prevent indeterminate behaviour
when two or more rules exist with the same salience level.

Any help would be much appreciated.

Regards,

Barnaby
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