[jboss-jira] [JBoss JIRA] (DROOLS-767) Reactive Property over immutable list

[Jonathan MERCIER (JIRA)]

Jonathan MERCIER created DROOLS-767:
---------------------------------------

             Summary: Reactive Property over immutable list
                 Key: DROOLS-767
                 URL: https://issues.jboss.org/browse/DROOLS-767
             Project: Drools
          Issue Type: Feature Request
            Reporter: Jonathan MERCIER
            Assignee: Mark Proctor
            Priority: Minor


When an object has an immutable list of mutable object using setter on this list is useless. But in such case with only the getter the corresponding attributes are not seen as an attributes.

see the code below:

{code:title=Concept.java|borderStyle=solid}
package fr.cea.ig.drools;

import org.kie.api.definition.type.PropertyReactive;

import javax.validation.constraints.NotNull;
import java.util.ArrayList;
import java.util.List;

@PropertyReactive
public class Concept {

    private final String name;
    private final List<Concept> concepts;
    private int value;

    @NotNull
    public String getName() {
        return name;
    }

    @NotNull
    public List<Concept> getConcepts() {
        return concepts;
    }


    public void setConcepts(@NotNull List<Concept> c) {
        throw new UnsupportedOperationException();
    }

    public int getValue() {
        return value;
    }

    public void setValue(int value) {
        this.value = value;
    }

    public Concept(final String name, final List<Concept> concepts) {
        this.name = name;
        this.concepts = (concepts == null)? new ArrayList<Concept>() : concepts ;
        value = 0;
    }

    @Override
    public String toString(){
        return String.format("NAME(%s) VALUE(%d)", name, value);
    }
}
{code}

And following rules
{code:title=rules.drl|borderStyle=solid}
package fr.cea.ig.drools;
import fr.cea.ig.drools.Concept;
import java.util.List;

dialect "mvel"


rule "All child concept has a value greater to 0"
    when
    $c : Concept( value == 0 ) @watch( concepts )
    $cl : List(size > 0) from collect( Concept( $c memberOf concepts) )
    forall( Concept( value > 0 ) from $cl )
    then
        modify($c){
            value = 1
        }
end

rule "Concept c1"
    when
    $c : Concept( name == "c1", value == 0 )
    then
        modify($c){
            value = 2
        }
end

rule "Concept c2"
    when
    $c : Concept( name == "c2", value == 0 )
    then
        modify($c){
            value = 3
        }
end
{code}

if the setter {{setConcepts}} is removed this error is raised:

{{
Unknown property concepts in @Watch annotation : [Rule name='All child concept has a value greater to 0']
}}

In my model I use interface instead of class to spread a generic vocabulary through various data type. Put a setter which should throw an Exception will confusing some people.

Regards





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