规则决策引擎drool使用

本篇记录了关于规则引擎drool的使用

使用场景

客户决策变动大,决策对象过。能极大优化代码,直观,后期增加规则方便,drool支持动态刷新规则表,excel可以转化为drl,
但是drl没有excel直观(drl比excel加载快).

官方文档地址

https://www.drools.org/

使用示例

依赖

<dependencies>
   <dependency>
   <groupId>org.drools</groupId>
   <artifactId>drools-bom</artifactId>
   <type>pom</type>
   <version>7.30.0.Final</version>
   <scope>import</scope>
   </dependency>
</dependencies>
<dependency>
   <groupId>org.kie</groupId>
   <artifactId>kie-api</artifactId>
</dependency>
<dependency>
   <groupId>org.drools</groupId>
   <artifactId>drools-compiler</artifactId>
   <scope>runtime</scope>
</dependency>
<dependency>
   <groupId>org.kie.server</groupId>
   <artifactId>kie-server-client</artifactId>
   <version>7.30.0.Final</version>
</dependency>
<dependency>
   <groupId>org.drools</groupId>
   <artifactId>drools-decisiontables</artifactId>
   <version>7.30.0.Final</version>
</dependency>
<!--excel解析-->
<dependency>
    <groupId>com.thoughtworks.xstream</groupId>
    <artifactId>xstream</artifactId>
    <version>1.4.10</version>
</dependency>

加载决策表

//自动加载资源文件下所有决策表
@Bean
public KieContainerSessionsPool kieContainerSessionsPool() {
    KieServices kieServices = KieServices.Factory.get();
    KieContainer kieContainer = kieServices.getKieClasspathContainer();
    KieContainerSessionsPool pool = kieContainer.newKieSessionsPool(10);
    return pool;
}

决策表方法

@Autowired
KieContainerSessionsPool pool;
//SummaryPaymentPlan是普通类
public SummaryPaymentPlan getSummaryPaymentPlanPool (SummaryPaymentPlan form) {
    KieSession kieSession = pool.newKieSession();
    kieSession.insert(form);
    int count = kieSession.fireAllRules();// 开始执行规则,并获取执行了多少条规则
    System.out.println("Fire " + count + " rule(s)!");
    kieSession.dispose();// 关闭session
    return form;
}

excel决策表