几个关键点:
1. 如果没有指定agenda-group 则默认把所有未指定agenda-group的 rules 都执行一遍
2. 如果指定了agenda-group 使用的时候必须指定该name才能被使用,默认是不能使用的
3. agenda-group name可以重复
4. agenda-group 用于区分rule
最简单的使用方法(部分代码参考第一节)
package cn.xiaojf.drools7.base; import org.apache.commons.lang3.StringUtils;
import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession; public class Base {
public KieSession getSession() {
KieServices kieServices = KieServices.Factory.get();
KieContainer kieContainer = kieServices.getKieClasspathContainer();
//kmodule.xml 中定义的 ksession name
KieSession kieSession = kieContainer.newKieSession("all-rules");
return kieSession;
} public KieSession getSession(String agendaGroupName) {
KieSession session = this.getSession();
if (StringUtils.isNoneBlank(agendaGroupName)) {
session.getAgenda().getAgendaGroup(agendaGroupName).setFocus();
} return session;
}
}
测试方法
package day20180117; import cn.xiaojf.drools7.base.Base;
import cn.xiaojf.drools7.model.Car;
import cn.xiaojf.drools7.model.Person;
import org.junit.Test;
import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession; public class Demo extends Base {
@Test
public void test() {
KieSession kieSession = getSession(); Person p1 = new Person();
p1.setAge(20);
Car car = new Car();
car.setPerson(p1); kieSession.insert(car); int count = kieSession.fireAllRules(); System.out.println(count);
System.out.println(car.getDiscount()); kieSession.dispose();
} @Test
public void test2() {
KieSession kieSession = getSession("test-group"); Person p1 = new Person();
p1.setAge(20);
Car car = new Car();
car.setPerson(p1); kieSession.insert(car); int count = kieSession.fireAllRules(); System.out.println(count);
System.out.println(car.getDiscount()); kieSession.dispose();
}
}
rule 文件
package cn.xiaojf.rules import cn.xiaojf.drools7.model.Car;
rule "car-discount>30"
agenda-group "test-group"
when
$car : Car(person.age > 30)
then
$car.setDiscount(80);
end
rule "car-discount<=30"
agenda-group "test-group"
when
$car : Car(person.age <= 30)
then
$car.setDiscount(90);
end
结果如下
1
90