[Drools Demos] 其 (一) : Quick Start

前言

基础配置: JDK 1.7 + Eclipse Mar + Maven

依赖: Drools插件(非必须)

本章主要对应项目内的drools-quickstart子模块.
Github地址: https://github.com/SeanYanxml/drools-train

---

Quick Start

Quick Start的基本操作步骤如下:

1 - pom.xml文件内导入所需依赖包:

	<!-- drools jars -->
	<properties>
		<drools-version>6.5.0.Final</drools-version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.drools</groupId>
			<artifactId>drools-core</artifactId>
			<version>${drools-version}</version>
		</dependency>

		<dependency>
			<groupId>org.drools</groupId>
			<artifactId>drools-compiler</artifactId>
			<version>${drools-version}</version>
		</dependency>

		<dependency>
			<groupId>org.drools</groupId>
			<artifactId>knowledge-api</artifactId>
			<version>${drools-version}</version>
		</dependency>

		<dependency>
			<groupId>org.drools</groupId>
			<artifactId>drools-decisiontables</artifactId>
			<version>${drools-version}</version>
		</dependency>
		<dependency>
			<groupId>org.drools</groupId>
			<artifactId>drools-templates</artifactId>
			<!--templates 模板 -->
			<version>${drools-version}</version>
		</dependency>
		<dependency>
			<groupId>org.kie</groupId>
			<artifactId>kie-api</artifactId>
			<version>${drools-version}</version>
		</dependency>

		<!-- other jars -->
		
		<!-- test -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.7</version>
			<scope>test</scope>
		</dependency>
  </dependencies>

2 - 编写Message.java类(用于规则文件内传递数据)

package com.yanxml.drools.quickstart;

/**
 * The pojo for drl.
 * @author Sean
 * */

public class Message {
	public static final int HELLO = 0;
	public static final int GOODBYE = 1;
	
	private String message;
	private int status;
	
	public String getMessage() {
		return message;
	}
	public void setMessage(String message) {
		this.message = message;
	}
	public int getStatus() {
		return status;
	}
	public void setStatus(int status) {
		this.status = status;
	}

}

3 - 编写kmodule.xml文件和QuickStart.drl规则文件

kmodule.xml

<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
    <kbase name="rules" packages="com.yanxml.drools.quickstart">
    <!-- 特别注意这边的packages 千万不能写成package 不然会报错 -->
    <!-- name 是kbase的名字 packages 是drl文件的路径 也就是HelloWorld.drl文件的物理路径 是在src/main/test 
		目录下的 -->
	<!-- ksession 是ksession的名字 但是此处ksession的名字和 .drl规则文件的名称不是对应的 -->
	<!-- 生成之后和.class文件放在一起 找的是resources下的物理地址 -->	        <ksession name="ksession-rules"/>
    </kbase>
    <kbase name="dtables" packages="dtables">
        <ksession name="ksession-dtables"/>
    </kbase>
</kmodule>

QuickStart.drl

package com.yanxml.drools.quickstart

import com.yanxml.drools.quickstart.Message;

rule "Hello World"
    when
        m : Message( status == Message.HELLO, myMessage : message )
    then
        System.out.println( myMessage );
        m.setMessage( "Goodbye cruel world" );
        m.setStatus( Message.GOODBYE );
        update( m );
end

rule "GoodBye"
    when
        Message( status == Message.GOODBYE, myMessage : message )
    then
        System.out.println( myMessage );
end

4 - 编写测试类DroolsBaseTest和QuickStartTest

DroolsBaseTest(基础测试类)

package com.yanxml.drools.quickstart;

import org.junit.Before;
import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;

public abstract class DroolsBaseTest {	
	
	protected KieServices kieServices;
	protected KieContainer kieContainer;
	
	@Before
	public void setUp(){
		kieServices = KieServices.Factory.get();
		kieContainer = kieServices.getKieClasspathContainer();
	}

}

QuickStartTest(QuickStart测试类)

package com.yanxml.drools.quickstart;

import org.junit.Test;
import org.kie.api.runtime.KieSession;


public class QuickStartTest extends DroolsBaseTest{
	
	@Test
	public void test(){
		KieSession kSession = kieContainer.newKieSession("ksession-rules");
		Message message = new Message();
		message.setMessage("Hello World");
		message.setStatus(Message.HELLO);
		kSession.insert(message);
		kSession.fireAllRules();
	}

}