[rules-users] User and/or Code problem with insert/retract and salience

[Jared Davis]

I've narrowed it down to a smaller example. The order of insertion seems to
trump the rule salience.

The following rule inserts 4 objects.  Inserted as A4,A3,A2,A1 the rules
sequence is unexpected. Inserted A1,A3,A4,A2 they fire as expected.

rule "setup.two"
when 
then
>  // generates out of salience rule execution
>   insert (new RuleLink("A4", new Double(65), null));
>   insert (new RuleLink("A3", new Double(70), null));
>   insert (new RuleLink("A2", new Double(65), null));
>   insert (new RuleLink("A1", new Double(70), null));
>
> /* // works ok
>   insert (new RuleLink("A1", new Double(70), null));
>   insert (new RuleLink("A3", new Double(70), null));
>   insert (new RuleLink("A4", new Double(65), null));
>   insert (new RuleLink("A2", new Double(65), null));
> */
end

Here are 3 of the 6 identical LHS rules differing only by salience
(70,65,60,55,50,0):
rule "a70"
salience 70
when 
>     link:      RuleLink( linkName: name matches "A.", d : aasDouble) 
>                RuleLink( name == "SKINS", partsO : a)
then
>      System.out.println("START 070 "  + d);
>      if ( d > 69.9)  {
>         System.out.println(drools.getRule().getName() + " retract " +
> linkName);
>         retract(link);
>      } else {
>         System.out.println(drools.getRule().getName() + " no retract " +
> linkName);
>      }
end

rule "a65"
salience 65
when 
>     link:      RuleLink( linkName: name matches "A.", d : aasDouble) 
>                RuleLink( name == "SKINS", partsO : a)
then
>      System.out.println("START 065 " + d);
>      if ( d > 64.9)  {
>         System.out.println(drools.getRule().getName() + " retract " +
> linkName);
>         retract(link);
>      } else {
>         System.out.println(drools.getRule().getName() + " no retract " +
> linkName);
>      }
end

rule "a60"
salience 60
when 
>     link:      RuleLink( linkName: name matches "A.", d : aasDouble) 
>                RuleLink( name == "SKINS", partsO : a)
then
>      System.out.println("*******  ERROR  ************");
>      System.out.println("START 060 " + d);
>      if ( d > 59.9)  {
>         System.out.println(drools.getRule().getName() + " retract " +
> linkName);
>         retract(link);
>      } else {
>         System.out.println(drools.getRule().getName() + " no retract " +
> linkName);
>      }
end

// One more setup rule

rule "setup.one"
when 
then
>   List skinParts = new ArrayList();
>   insert (new RuleLink("SKINS", skinParts, null));
end



Here is the test run:

START 070 70.0
a70 retract A1
START 070 65.0
a70 no retract A2
START 070 70.0
a70 retract A3
START 070 65.0
a70 no retract A4
START 065 65.0
a65 retract A2
********  ERROR  ********
START 060 65.0
a60 retract A4

A4 never ran rule 065. It skipped to rule 060 from 070.

The error is very sensitive to other rules in the package.  

Is this the expected behavior?

(I would like to keep the reasons for a branch on the RHS vs an eval on the
LHS out of this discussion.)

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