easy-rules yaml 组合模式rule 配置

easy-rules 支持组合模式，但是一般我们看到的都是基于代码的，以下是一个基于yaml配置的组合模式rule 的试用

项目结构

• pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.dalong</groupId>

  <artifactId>myruleapps</artifactId>

  <version>1.0-SNAPSHOT</version>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <encoding>UTF-8</encoding>

    <java.version>1.8</java.version>

    <maven.compiler.source>1.8</maven.compiler.source>

    <maven.compiler.target>1.8</maven.compiler.target>

  </properties>

  <build>

    <plugins>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-compiler-plugin</artifactId>

        <configuration>

          <source>8</source>

          <target>8</target>

        </configuration>

      </plugin>

    </plugins>

  </build>

  <packaging>jar</packaging>

  <dependencies>

    <dependency>

      <groupId>org.jeasy</groupId>

      <artifactId>easy-rules-core</artifactId>

      <version>3.4.0</version>

    </dependency>

    <dependency>

      <groupId>org.jeasy</groupId>

      <artifactId>easy-rules-mvel</artifactId>

      <version>3.4.0</version>

    </dependency>

    <dependency>

      <groupId>org.jeasy</groupId>

      <artifactId>easy-rules-spel</artifactId>

      <version>3.4.0</version>

    </dependency>

    <dependency>

      <groupId>org.slf4j</groupId>

      <artifactId>slf4j-simple</artifactId>

      <version>1.7.25</version>

    </dependency>

  </dependencies>

</project>

• rule yaml 文件
  rules-com.yml

 

---

name: "1"

description: "1"

priority: 1

compositeRuleType: "UnitRuleGroup"

composingRules:

  - name: "2"

    description: "2"

    condition: "user.getAge()<29"

    priority: 2

    actions:

      - "System.out.println(\"UnitRuleGroup rule2 \")"

  - name: "3"

    description: "3"

    condition: "user.name.length<10"

    priority: 3

    actions:

      - "System.out.println(\"UnitRuleGroup rule3 \")"

---

name: "3"

description: "3"

condition: "user.name.length<50"

priority: 3

actions:

  - "System.out.println(\"default rule3 \")"

代码集成

• 入口
  注意引入了一个包含返回值的rule，具体参考https://www.cnblogs.com/rongfengliang/p/12688192.html

 

import org.jeasy.rules.api.*;

import org.jeasy.rules.core.DefaultRulesEngine;

import org.jeasy.rules.core.InferenceRulesEngine;

import org.jeasy.rules.core.RuleBuilder;

import org.jeasy.rules.mvel.MVELRuleFactory;

import org.jeasy.rules.support.YamlRuleDefinitionReader;

import org.mvel2.ParserContext;

​

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.util.HashMap;

import java.util.Map;

​

import static com.dalong.DecreaseTemperatureAction.decreaseTemperature;

import static com.dalong.HighTemperatureCondition.itIsHot;

import static com.dalong.AppendUserName.appendUserName;

import static com.dalong.NameTooShort.nameTooShort;

​

public class Launcher {

​

    public static void main(String[] args) throws Exception {

       app4();

    }

    // 加载方式没变

    private static void app4() throws Exception {

        MVELRuleFactory ruleFactory = new MVELRuleFactory(new YamlRuleDefinitionReader());

        ParserContext context =new ParserContext();

        context.addImport("UserService", UserService.class);

        Rules yamlRules = ruleFactory.createRules(new FileReader(Launcher.class.getClassLoader().getResource("rules-com.yml").getFile()),context);

        DefaultRulesEngine rulesEngine = new DefaultRulesEngine();

        Facts facts = new Facts();

        MyRule<User> rule = new MyRule<User>();

        Map<Object,Object> userinfo = new HashMap<>();

        userinfo.put("name2","dalong");

        userinfo.put("age2",27);

        yamlRules.register(rule);

        User user =new User("dalong",27);

        user.setUserinfo(userinfo);

        facts.put("user",user);

        rulesEngine.registerRuleListener(new MyRulesListener());

        rulesEngine.registerRulesEngineListener(new MyRuleEngineListener());

        rulesEngine.fire(yamlRules, facts);

        if(rule.isExecuted()){

            User userResult= rule.getResult();

            System.out.println("result from final ruls"+userResult.toString());

        }

    }

​

}

• 运行效果

四月 12, 2020 11:30:46 下午 com.dalong.MyRuleEngineListener beforeEvaluate

信息: -----------------beforeEvaluate-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRuleEngineListener beforeEvaluate

信息: org.jeasy.rules.api.Rules@78c03f1f [ { user : User{name='dalong', age=27, userinfo={name2=dalong, age2=27}} } ]

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener afterEvaluate

信息: -----------------afterEvaluate-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener beforeExecute

信息: -----------------beforeExecute-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener onSuccess

信息: -----------------onSuccess-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener afterEvaluate

信息: -----------------afterEvaluate-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener beforeExecute

信息: -----------------beforeExecute-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener onSuccess

信息: -----------------onSuccess-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener afterEvaluate

信息: -----------------afterEvaluate-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener beforeExecute

信息: -----------------beforeExecute-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRulesListener onSuccess

信息: -----------------onSuccess-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRuleEngineListener afterExecute

信息: -----------------afterExecute-----------------

四月 12, 2020 11:30:46 下午 com.dalong.MyRuleEngineListener afterExecute

信息: org.jeasy.rules.api.Rules@78c03f1f [ { user : User{name='dalong', age=27, userinfo={name2=dalong, age2=27}} } ]

UnitRuleGroup rule2 

UnitRuleGroup rule3 

default rule3 

my rule has been executed

result from final rulsUser{name='dalong', age=27, userinfo={name2=dalong, age2=27}}

​

Process finished with exit code 0

说明

其他组合模式的rule，配置一样

参考资料

https://github.com/j-easy/easy-rules/blob/master/easy-rules-support/src/main/java/org/jeasy/rules/support/AbstractRuleDefinitionReader.java