spring boot + drools学习笔记（一）

引入依赖

	org.drools
	drools-core
	7.14.0.Final


	org.kie
	kie-spring
	7.14.0.Final

配置

package com.wyc.drools;

import org.kie.api.KieBase;
import org.kie.api.KieServices;
import org.kie.api.builder.*;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import org.kie.internal.io.ResourceFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import java.io.IOException;

/**
 * @author: wyc
 * @date: 2019/3/20
 */
@Configuration
public class DroolAutoConfiguration {

    private static final String RULE_PATH = "rules/";

    @Bean
    @ConditionalOnMissingBean(KieFileSystem.class)
    public KieFileSystem kieFileSystem() throws IOException {
        KieFileSystem kieFileSystem = getKieServices().newKieFileSystem();
        for(Resource resource : getRuleFiles()){
            kieFileSystem.write(ResourceFactory.newClassPathResource(RULE_PATH + resource.getFilename(),"UTF-8"));
        }
        return kieFileSystem;
    }

    @Bean
    @ConditionalOnMissingBean(KieContainer.class)
    public KieContainer kieContainer() throws IOException {
        final KieRepository kieRepository = getKieServices().getRepository();
        kieRepository.addKieModule(new KieModule() {
            @Override
            public ReleaseId getReleaseId() {
                return kieRepository.getDefaultReleaseId();
            }
        });

        KieBuilder kieBuilder = getKieServices().newKieBuilder(kieFileSystem());
        kieBuilder.buildAll();
        return getKieServices().newKieContainer(kieRepository.getDefaultReleaseId());
    }

    @Bean
    @ConditionalOnMissingBean(KieBase.class)
    public KieBase kieBase() throws IOException {
        return kieContainer().getKieBase();
    }

    @Bean
    @ConditionalOnMissingBean(KieSession.class)
    public KieSession kieSession() throws IOException {
        KieSession kieSession = kieContainer().newKieSession();
        return kieSession;
    }


    private Resource[] getRuleFiles() throws IOException {
        ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
        return resourcePatternResolver.getResources("classpath*:" + RULE_PATH + "**/*.*");
    }


    public KieServices getKieServices(){
        System.setProperty("drools.dateFotmat","yyyy-MM-dd");
        return KieServices.Factory.get();
    }
}

实体类

package com.wyc.drools;

/**
 * @author: wyc
 * @date: 2019/3/20
 */
public class User {

    private String name;

    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

语法规则实例

Hello world

规则

rule "helloworld"
    when
        eval(true)
    then
        System.err.println("hello,world!");
    end

测试代码

@Test
public void testHelloWorld() {
	kieSession.fireAllRules();
}

输出

hello,world!

---

条件筛选

规则

rule "user"
    when
        $u:User(name=="张三",age==18)
    then
        $u.setName("李四");
        System.out.println($u.getName());
    end

测试代码

@Test
public void testChangeUserName(){
	User user = new User();
	user.setAge(18);
	user.setName("张三");
	kieSession.insert(user);
	kieSession.fireAllRules(new RuleNameEndsWithAgendaFilter("user"));
    System.err.println("更改后的姓名：" + user.getName());
}

输出

李四

更改后的姓名：李四

---

自定义筛选器

规则

rule "customerRule1"
    when
        eval(true)
    then
        System.err.println("customerRule1");
    end

rule "customerRule2"
    when
        eval(true)
    then
        System.err.println("customerRule2");
    end

测试代码

@Test
public void testCustomerFilter(){
	kieSession.fireAllRules(new CustomerFilter());
}

输出

customerRule1
customerRule2

---

contains

规则

rule "contains"
    when
        $s:String()
        $u:User(name contains $s)
    then
        System.err.println("包含");
    end

测试代码

@Test
public void testContains(){
	User user = new User();
	user.setName("张三");
	//按照rule中的参数顺序依次insert
	kieSession.insert("张三");
	kieSession.insert(user);
	kieSession.fireAllRules(new RuleNameEndsWithAgendaFilter("contains"));
}

输出

包含

---

memberOf

规则

rule "memberOf"
    when
        $list:List()
        $u:User(name memberOf $list)
    then
        System.err.println("成员属于");
    end

测试代码

@Test
public void testMemberOf(){
	List names = Stream.of("张三","李四").collect(Collectors.toList());
	User user = new User();
	user.setName("张三");
	kieSession.insert(names);
	kieSession.insert(user);
	kieSession.fireAllRules(new RuleNameEndsWithAgendaFilter("memberOf"));
}

输出

成员属于

---

matches

规则

rule "matches"
    when
        // 必须使用.
        $u:User(name matches "张.*")
    then
        System.err.println($u.getName());
    end

测试代码

@Test
public void testMatches(){
	User user = new User();
	user.setName("张三");
	kieSession.insert(user);
	kieSession.fireAllRules(new RuleNameEndsWithAgendaFilter("matches"));
}

输出

张三

---