[drools-user] looking for example to write rules

[saurabh shukla]

Hi All,

I am trying been playing around with drools and I wanted to know if any 
one can give me an example of a rule written in pure DSL like in conway 
which passes a parameter to a function/method which is part of a 
condition or an action.

I have pasted conway.xsd and conway.dsl.drl below.

To give an example of what I need, in the rules mentioned below, what do 
I need to do to pass one/multiple parameter(s) to the method "killCell" 
and how should I define that in the xml and xsd.



TIA
Saurabh


=============== Rules Files ============================

<?xml version="1.0"?>

<rule-set name="conway"
    xmlns="http://drools.org/rules";
    xmlns:conway="http://drools.org/semantics/conway";
    xmlns:xs="http://www.w3.org/2001/XMLSchema-instance";
    xs:schemaLocation="http://drools.org/rules rules.xsd
                       http://drools.org/semantics/conway conway.xsd">

    <rule name="Kill The Overcrowded">
        <conway:condition cellName="cell">
            <conway:cellIsAlive/>
            <conway:cellIsOverCrowded/>
        </conway:condition>

        <conway:actions cellName="cell">
            <conway:killCell/>
        </conway:actions>
    </rule>

    <rule name="Kill The Lonely">
        <conway:condition cellName="cell">
            <conway:cellIsAlive/>
            <conway:cellIsLonely/>
        </conway:condition>

        <conway:actions cellName="cell">
            <conway:killCell/>
        </conway:actions>
    </rule>

    <rule name="Give Birth">
        <conway:condition cellName="cell">
            <conway:cellIsDead/>
            <conway:cellIsRipeForBirth/>
        </conway:condition>

        <conway:actions cellName="cell">
            <conway:giveBirthToCell/>
        </conway:actions>
    </rule>
</rule-set>

==============Schema definition ===================

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
    targetNamespace="http://drools.org/semantics/conway";
    elementFormDefault="qualified"
    xmlns:conway="http://drools.org/semantics/conway";
    xmlns:rules="http://drools.org/rules";>

    <xs:import namespace="http://drools.org/rules"; 
schemaLocation="rules.xsd"/>

    <xs:element name="condition" 
substitutionGroup="rules:abstractCondition">
        <xs:complexType>
            <xs:all>
                <xs:element ref="conway:cellIsAlive" minOccurs="0" 
maxOccurs="1"/>
                <xs:element ref="conway:cellIsDead" minOccurs="0" 
maxOccurs="1"/>
                <xs:element ref="conway:cellIsOverCrowded" 
minOccurs="0" maxOccurs="1"/>
                <xs:element ref="conway:cellIsRipeForBirth" 
minOccurs="0" maxOccurs="1"/>
                <xs:element ref="conway:cellIsLonely" minOccurs="0" 
maxOccurs="1"/>
            </xs:all>
            <xs:attribute name="cellName" type="xs:string"/>
        </xs:complexType>
    </xs:element>

    <xs:element name="actions" 
substitutionGroup="rules:abstractConsequence">
        <xs:complexType>
            <xs:sequence>
                <xs:choice>
                    <xs:element ref="conway:killCell"/>
                    <xs:element ref="conway:giveBirthToCell"/>
                </xs:choice>
            </xs:sequence>
            <xs:attribute name="cellName" type="xs:string"/>
        </xs:complexType>
    </xs:element>

    <xs:element name="killCell"/>
    <xs:element name="giveBirthToCell"/>
    <xs:element name="cellIsAlive"/>
    <xs:element name="cellIsDead"/>
    <xs:element name="cellIsOverCrowded"/>
    <xs:element name="cellIsLonely"/>
    <xs:element name="cellIsRipeForBirth"/>

</xs:schema>