drools noloop demo

 

public class Goods {
    private int discount = 100;
    private int type;
}

 

kmodule.xml

<kbase name="noLoop-kbase"  packages="com.kq.noloop" >
    <ksession name="noLoopSession"/>
</kbase>

noloop.drl

package com.kq.noloop

import com.kq.drools.entity.Goods

rule "updateDistcount"
// 设置为 true
no-loop true
when
    productObj:Goods(discount > 0);
then
    // 符合就将Discount自增1
    productObj.setDiscount(productObj.getDiscount() + 1);
    System.out.println("discount="+productObj.getDiscount());
    update(productObj);  //这个会导致死循环   要加no-loop true
end

 

NoLoopTest

public class NoLoopTest {

    public static void main(String[] args) {
        // 构建KieServices
        KieServices ks = KieServices.Factory.get();
        KieContainer kieContainer = ks.getKieClasspathContainer();
        // 获取kmodule.xml中配置中名称为ksession-rule的session，默认为有状态的。
        KieSession kSession = kieContainer.newKieSession("noLoopSession");

        Goods product = new Goods();
        product.setType(1);
        product.setDiscount(10);

        kSession.insert(product);
        int count = kSession.fireAllRules();
        System.out.println("命中了" + count + "条规则！");
        System.out.println("商品" +product.getType() + "的商品折扣为" + product.getDiscount() + "%。");

        kSession.dispose();

    }

}