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Drools-Example

Honest Politician

  • 使用kmodule的方式调用drools 创建文件：/resources/META-INF/kmodule.xml

    <?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://www.drools.org/xsd/kmodule">
    <kbase name="HonestPoliticianKB" packages="com.xu.drools.rule.honestpolitician">
        <ksession name="HonestPoliticianKS"/>
    </kbase>
</kmodule>

  • rule

    package com.xu.drools                 //package指定命名空间:com.xu.drools

import com.xu.drools.bean.Politician; //import要使用的对象:Politician
import com.xu.drools.bean.Hope;       //import要使用的对象:Hope

rule "We have an honest Politician"   //rule,定义规则:We have an honest Politician
    salience 10                       //salience，属性部分，定义优先级:10
    when
        exists( Politician( honest == true ) ) //exists,条件部分-LHS，定义当前规则的条件：存在honest==true的Politician
    then
        insertLogical( new Hope() );  //insertLogical,结果部分-RHS，定义规则满足后执行的操作：往当前workingMemory中插入一个新的Hope对象
end                                   //规则结束

rule "Hope Lives"
    salience 10
    when
        exists( Hope() )
    then
        System.out.println("Hurrah!!! Democracy Lives");
end

rule "Hope is Dead"
    when
        not( Hope() )                 //not,不存在：不存在Hope对象
    then
        System.out.println( "We are all Doomed!!! Democracy is Dead" );
end

rule "Corrupt the Honest"
    when
        politician : Politician( honest == true )
        exists( Hope() )
    then
        System.out.println( "I'm an evil corporation and I have corrupted " + politician.getName() );
        modify( politician ) {        //modify,修改：修改politician的Honest为false
            setHonest( false )
        }
end

  • 数据的输入

     public static void main(final String[] args) {
    KieContainer kc = KieServices.Factory.get().getKieClasspathContainer();
    System.out.println(kc.verify().getMessages().toString());
    execute( kc );
}

public static void execute( KieContainer kc ) {
    KieSession ksession = kc.newKieSession("HonestPoliticianKS");

    final Politician p1 = new Politician( "President of Umpa Lumpa", true );
    final Politician p2 = new Politician( "Prime Minster of Cheeseland", true );
    final Politician p3 = new Politician( "Tsar of Pringapopaloo", true );
    final Politician p4 = new Politician( "Omnipotence Om", true );

    ksession.insert( p1 );
    ksession.insert( p2 );
    ksession.insert( p3 );
    ksession.insert( p4 );

    ksession.fireAllRules();

    ksession.dispose();
}

  • rule的执行顺序

    http://cdn.heroxu.com/20190829156706732481281.png

  • 执行结果

    Hurrah!!! Democracy Lives
I'm an evil corporation and I have corrupted President of Umpa Lumpa
I'm an evil corporation and I have corrupted Prime Minster of Cheeseland
I'm an evil corporation and I have corrupted Tsar of Pringapopaloo
I'm an evil corporation and I have corrupted Omnipotence Om
We are all Doomed!!! Democracy is Dead