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