[bigdata-094] drools+eclipse+maven开发一个drools的应用

1. 此例子跟前述例子相似，但不需要在eclipse安装drools插件

2. 目录结构

├── pom.xml
├── src
│   ├── main
│   │   ├── java
│   │   │   └── com
│   │   │       └── ttz
│   │   │           └── demo
│   │   │               └── droolsdemo
│   │   │                   ├── App.java
│   │   │                   └── Message.java
│   │   └── resources
│   │       ├── META-INF
│   │       │   ├── kmodule.xml
│   │       │   └── maven
│   │       │       └── pom.properties
│   │       └── rules
│   │           ├── Sample2.drl
│   │           └── Sample.drl

3. pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.ttz.demo</groupId>
  <artifactId>droolsdemo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>droolsdemo</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <runtime.version>6.4.0.Final</runtime.version>
  </properties>

  <repositories>
    <repository>
      <id>jboss-public-repository-group</id>
      <name>JBoss Public Repository Group</name>
      <url>http://repository.jboss.org/nexus/content/groups/public/</url>
      <releases>
        <enabled>true</enabled>
        <updatePolicy>never</updatePolicy>
      </releases>
      <snapshots>
        <enabled>true</enabled>
        <updatePolicy>daily</updatePolicy>
      </snapshots>
    </repository>
  </repositories>
  
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    
    <dependency>
      <groupId>org.kie</groupId>
      <artifactId>kie-api</artifactId>
      <version>${runtime.version}</version>
    </dependency>
    
    <dependency>
      <groupId>org.drools</groupId>
      <artifactId>drools-core</artifactId>
      <version>${runtime.version}</version>
    </dependency>
    
    <dependency>
      <groupId>org.drools</groupId>
      <artifactId>drools-decisiontables</artifactId>
      <version>${runtime.version}</version>
    </dependency>

    <dependency>
      <groupId>org.jbpm</groupId>
      <artifactId>jbpm-test</artifactId>
      <version>${runtime.version}</version>
    </dependency>
    
     <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>0.9.29</version>
        </dependency>

        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>0.9.29</version>
        </dependency>


        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.1</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>log4j-over-slf4j</artifactId>
            <version>1.6.1</version>
        </dependency>
    
  </dependencies>
</project>

4. App.java

package com.ttz.demo.droolsdemo;

import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;

import com.ttz.demo.droolsdemo.Message;

public class App 
{
    public static void main( String[] args )
    {
    	//KieServices是一个单实例，它为其他Services提供一个hub式的接口
    	KieServices ks = KieServices.Factory.get();
    	//1. KieBase: 定义了规则引擎的所有知识knowledge。它包括规则，过程，函数，类型等。不包含运行时数据。
    	//2. KieModule: KieModule是一个容器，它定义一组KieBase需要的所有资源。
    	//kmoudle.xml就像pom.xml一样，它可以指定KBase的name，能创建的KieSession,以及其他所需要的资源。    	
    	//3. KieContainer:指定了KieModule之后，KieContainer就这个KieModule里的所有KieBase的容器
    	KieContainer kContainer = ks.getKieClasspathContainer();
    	//KieSession：用户和规则引擎的交互方式，可以多次对话，保留对话过程信息，可以多次推理。
    	KieSession kSession = kContainer.newKieSession("ksession-rules");

    	Message message = new Message();
        message.setMessage("Hello World 2");
        message.setStatus(Message.HELLO);
        kSession.insert(message);
        kSession.fireAllRules();
        //释放资源，可能有gc
        kSession.dispose();
    }
}

5.Message.java

package com.ttz.demo.droolsdemo;

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;
	}

}

6.kmodule.xml

<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
    <kbase name="rules" packages="rules">
        <ksession name="ksession-rules"/>
    </kbase>
</kmodule>

7. pom.properites

groupId=com.ttz.demo
artifactId=droolsdemo
version=1.0.0-SNAPSHOT

8.Sample.drl

package com.ttz.demo
 
import com.ttz.demo.droolsdemo.Message;
 
rule "Hello World"
    when
        m : Message( status == Message.HELLO, myMessage : message )
    then
        //System.out.println( myMessage );
        //m.setMessage( "THis is my hello world" );
        //m.setStatus( Message.GOODBYE );
        //update( m );
        System.out.print("hello wrold\n");
end

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

9. Sample2.drl

package com.ttz.demo
 
import com.ttz.demo.droolsdemo.Message;
 
rule "Hello World 2"
    when
        m : Message( status == Message.HELLO, myMessage : message )
    then
        System.out.println("hello world 2\n");
        //System.out.println( myMessage );
        //m.setMessage( "THis is my hello world 2" );
        //m.setStatus( Message.GOODBYE );
        //update( m );
end

rule "GoodBye 2"
    when
        Message( status == Message.GOODBYE, myMessage : message )
    then
        System.out.println( myMessage );
end