[Drools Demos] 其 (一) : Quick Start

ゝ一纸荒年。 2022-03-17 07:48 205阅读 0赞

### 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][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:

<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>
    			
    			<version>${drools-version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.kie</groupId>
    			<artifactId>kie-api</artifactId>
    			<version>${drools-version}</version>
    		</dependency>
    
    		
    		
    		
    		<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">
        
        
    	
    		        <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();
    	}
    
    }

[https_github.com_SeanYanxml_drools-train]: https://github.com/SeanYanxml/drools-train