10:38 p.m.
Main Class as follows
package com.sample;
import java.io.InputStreamReader;
import java.io.Reader;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;
/**
* This is a sample file to launch a rule package from a rule source
file.
*/
public class DroolsTest1 {
public static final void main(String[] args) {
try {
//load up the rulebase
RuleBase ruleBase = readRule();
WorkingMemory workingMemory = ruleBase.newWorkingMemory();
//go !
Message message = new Message();
message.setOp1(2);
message.setOp2(2);
workingMemory.assertObject( message );
workingMemory.fireAllRules();
} catch (Throwable t) {
t.printStackTrace();
}
}
/**
* Please note that this is the "low level" rule assembly API.
*/
private static RuleBase readRule() throws Exception {
//read in the source
Reader source = new InputStreamReader(
DroolsTest1.class.getResourceAsStream( "/Sample1.drl" ) );
//optionally read in the DSL (if you are using it).
//Reader dsl = new InputStreamReader(
DroolsTest.class.getResourceAsStream( "/mylang.dsl" ) );
//Use package builder to build up a rule package.
//An alternative lower level class called "DrlParser" can
also be used...
PackageBuilder builder = new PackageBuilder();
//this wil parse and compile in one step
//NOTE: There are 2 methods here, the one argument one is
for normal DRL.
//builder.addPackageFromDrl( source );
builder.addPackageFromXml( source );
//Use the following instead of above if you are using a DSL:
//builder.addPackageFromDrl( source, dsl );
//get the compiled package (which is serializable)
Package pkg = builder.getPackage();
//add the package to a rulebase (deploy the rule package).
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( pkg );
return ruleBase;
}
public static class Message {
int op1 ;
int op2;
/**
* @return the op1
*/
public int getOp1() {
return op1;
}
/**
* @param op1 the op1 to set
*/
public void setOp1(int op1) {
this.op1 = op1;
}
/**
* @return the op2
*/
public int getOp2() {
return op2;
}
/**
* @param op2 the op2 to set
*/
public void setOp2(int op2) {
this.op2 = op2;
}
}
}
It's in src/ java /com/ com.sample package
The sample1.drl file in src/ rules/Sample.drl is as follows
<?xml version="1.0"?>
<rule-set name="BusinessRulesSample"
xmlns="http://drools.org/rules"
xmlns:java="http://drools.org/semantics/java"
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:schemaLocation="http://drools.org/rules rules.xsd
http://drools.org/semantics/java java.xsd">
<!-- Code for Drools Article (c)www.firstpartners.net 2005 -->
<!-- Import the Java Objects that we refer to in our rules -->
<java:import>java.lang.Object</java:import>
<java:import>java.lang.String</java:import>
<java:import>com.sample.DroolsTest1.*</java:import>
<java:functions>
public void printValues(int i, int j)
{
System.out.println("hi"+i+j);
}
</java:functions>
<!-- Check for XYZ Corp-->
<rule name="XYZCorp" >
<!-- Parameters we can pass into the business rule -->
<parameter identifier="message">
<class>com.sample.DroolsTest1.Message</class>
</parameter>
<!-- Conditions or 'Left Hand Side' (LHS) that must be met for
business rule to fire -->
<java:condition>message.getOp1()==2</java:condition>
!-- What happens when the business rule is activated -->
<java:consequence>
printValues(message.getOp1(),message.getOp2());
</java:consequence>
</rule>
</rule-set>
When I run the program I will get the following error. If I change
addPackageFromXml to addPackageFromDrl the error is same . So please
help me in this
(null: 7, 74): cvc-elt.1: Cannot find the declaration of element
'rule-set'.
org.drools.compiler.DroolsParserException
at org.drools.compiler.PackageBuilder.addPackageFromXml(Unknown
Source)
at com.sample.DroolsTest1.readRule(DroolsTest1.java:55)
at com.sample.DroolsTest1.main(DroolsTest1.java:21)
Thanks & Regards
Shilpa
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