「 java架构师之路必备 」 Java规则引擎 Easy Rules

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2023-07-19
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1. Easy Rules 概述

Easy Rules是一个 Java 规则引擎，灵感来自一篇名为《Should I use a Rules Engine?》的文章

Easy Rules它提供Rule抽象以创建具有条件和动作的规则，并提供RuleEngine API，该API通过一组规则运行以评估条件并执行动作。

Easy Rules简单易用，只需两步：

首先，定义规则，方式有很多种

方式一：注解

 @Rule(name = "weather rule", description = "if it rains then take an umbrella")
public class WeatherRule {
 
    @Condition
    public boolean itRains(@Fact("rain") boolean rain) {
        return rain;
    }
    
    @Action
    public void takeAnUmbrella() {
        System.out.println("It rains, take an umbrella!");
    }
}

方式二：链式编程

 Rule weatherRule = new RuleBuilder()
        .name("weather rule")
        .description("if it rains then take an umbrella")
        .when( facts  -> facts.get("rain").equals(true))
        .then(facts -> System.out.println("It rains, take an umbrella!"))
        .build();

方式三：表达式

 Rule weatherRule = new MVELRule()
        .name("weather rule")
        .description("if it rains then take an umbrella")
        .when("rain == true")
        .then("System.out.println("It rains, take an umbrella!");");

方式四：yml配置文件

例如：weather-rule.yml

 name: "weather rule"
description: "if it rains then take an umbrella"
condition: "rain == true"
actions:
  - "System.out.println("It rains, take an umbrella!");" 
 MVELRuleFactory ruleFactory = new MVELRuleFactory(new YamlRuleDefinitionReader());
Rule weatherRule = ruleFactory.createRule(new FileReader("weather-rule.yml"));

接下来，应用规则

 public class Test {
    public static void main(String[] args) {
        // define facts
        Facts facts = new Facts();
        facts.put("rain", true);
 
        // define rules
        Rule weatherRule = ...
        Rules rules = new Rules();
        rules.register(weatherRule);
 
        // fire rules on known facts
        RulesEngine rulesEngine = new DefaultRulesEngine();
        rulesEngine.fire(rules, facts);
    }
}

入门案例：Hello Easy Rules 

 <dependency>
    <groupId> org .jeasy</groupId>
    <artifactId>easy-rules-core</artifactId>
    <version>.0.0</version>
</dependency>

通过骨架创建maven项目：

 mvn archetype:generate 
    -DarchetypeGroupId=org.jeasy 
    -DarchetypeArtifactId=easy-rules-archetype 
    -DarchetypeVersion=.0.0

默认给我们生成了一个HelloWorldRule规则，如下：

 package com.cjs.example.rules;
 
import org.jeasy.rules. annotation .Action;
import org.jeasy.rules.annotation.Condition;
import org.jeasy.rules.annotation.Rule;
 
@Rule(name = "Hello World rule", description = "Always say hello world")
public class HelloWorldRule {
 
    @Condition
    public boolean when() {
        return true;
    }
 
    @Action
    public void then() throws Exception {
        System.out.println("hello world");
    }
 
}

2. 规则定义

2.1. 定义规则

大多数业务规则可以用以下定义表示：

  • Name : 一个命名空间下的唯一的规则名称
  • Description : 规则的简要描述
  • Priority : 相对于其他规则的优先级
  • Facts : 事实，可立即为要处理的数据
  • Conditions : 为了应用规则而必须满足的一组条件
  • Actions : 当条件满足时执行的一组动作

Easy Rules为每个关键点提供了一个抽象来定义业务规则。

在Easy Rules中，Rule接口代表规则

 public interface Rule {
 
    /**
    * This method encapsulates the rule's conditions.
    * @return true if the rule should be applied given the provided facts, false otherwise
    */    boolean evaluate(Facts facts);
 
    /**
    * This method encapsulates the rule's actions.
    * @throws Exception if an error occurs during actions performing
    */    void execute(Facts facts) throws Exception;
 
    //Getters and setters for rule name, description and priority omitted.
 
}

evaluate方法封装了必须计算结果为TRUE才能触发规则的条件。execute方法封装了在满足规则条件时应该执行的动作。条件和操作由Condition和Action接口表示。

定义规则有两种方式：

  • 通过在POJO类上添加注解
  • 通过RuleBuilder API编程

可以在一个POJO类上添加@Rule注解，例如：

 @Rule(name = "my rule", description = "my rule description", priority =)
public class MyRule {
 
    @Condition
    public boolean when(@Fact("fact") fact) {
        //my rule conditions
        return true;
    }
 
    @Action(order =)
    public void then(Facts facts) throws Exception {
        //my actions
    }
 
    @Action(order =)
    public void finally() throws Exception {
        //my final actions
    }
 
}

@Condition注解指定规则条件@Fact注解指定参数@Action注解指定规则执行的动作

RuleBuilder支持链式风格定义规则，例如：

 Rule rule = new RuleBuilder()
                .name("myRule")
                .description("myRuleDescription")
                .priority()
                .when(condition)
                .then(action)
                .then(action)
                .build();

组合规则

CompositeRule由一组规则组成。这是一个典型地组合设计模式的实现。

组合规则是一个抽象概念，因为可以以不同方式触发组合规则。

Easy Rules自带三种CompositeRule实现：

  • UnitRuleGroup : 要么应用所有规则，要么不应用任何规则（AND逻辑）
  • ActivationRuleGroup : 它触发第一个适用规则，并忽略组中的其他规则（XOR逻辑）
  • ConditionalRuleGroup : 如果具有最高优先级的规则计算结果为true，则触发其余规则

复合规则可以从基本规则创建并注册为常规规则：

 //Create a composite rule from two primitive rules
UnitRuleGroup myUnitRuleGroup = new UnitRuleGroup("myUnitRuleGroup", "unit of myRule and myRule2");
myUnitRuleGroup.addRule(myRule);
myUnitRuleGroup.addRule(myRule);
 
//Register the composite rule as a regular rule
Rules rules = new Rules();
rules.register(myUnitRuleGroup);
 
RulesEngine rulesEngine = new DefaultRulesEngine();
rulesEngine.fire(rules, someFacts);

每个规则都有优先级。它代表触发注册规则的默认顺序。默认情况下，较低的值表示较高的优先级。可以重写compareTo方法以提供自定义优先级策略。

2.2. 定义事实

在Easy Rules中，Fact API代表事实

 public class Fact<T> {
     private final String name;
     private final T value;
}

举个例子：

 Fact<String> fact = new Fact("foo", "bar");
Facts facts = new Facts();
facts.add(fact);

或者，也可以用这样简写形式

 Facts facts = new Facts();
facts.put("foo", "bar");

用@Fact注解可以将Facts注入到condition和action方法中

 @Rule
class WeatherRule {
 
    @Condition
    public boolean itRains(@Fact("rain") boolean rain) {
        return rain;
    }
 
    @Action
    public void takeAnUmbrella(Facts facts) {
        System.out.println("It rains, take an umbrella!");
        // can add/remove/modify facts
    }
 
}

2.3. 定义规则引擎

Easy Rules提供两种RulesEngine接口实现：

  • DefaultRulesEngine : 根据规则的自然顺序应用规则
  • InferenceRulesEngine : 持续对已知事实应用规则，直到不再适用任何规则为止

创建规则引擎：

 RulesEngine rulesEngine = new DefaultRulesEngine();
 
// or
 
RulesEngine rulesEngine = new InferenceRulesEngine();

然后，注册规则

 rulesEngine.fire(rules, facts);

规则引擎有一些可配置的参数，如下图所示：

举个例子：

 RulesEngineParameters parameters = new RulesEngineParameters()
    .rulePriorityThreshold()
    .skipOnFirstAppliedRule(true)
    .skipOnFirstFailedRule(true)
    .skipOnFirstNonTriggeredRule(true);
 
RulesEngine rulesEngine = new DefaultRulesEngine(parameters);

2.4. 定义规则监听器

通过实现RuleListener接口

 public interface RuleListener {
 
    /**
     * Triggered before the evaluation of a rule.
     *
     * @param rule being evaluated
     * @param facts known before evaluating the rule
     * @return true if the rule should be evaluated, false otherwise
     */    default boolean beforeEvaluate(Rule rule, Facts facts) {
        return true;
    }
 
    /**
     * Triggered after the evaluation of a rule.
     *
     * @param rule that has been evaluated
     * @param facts known after evaluating the rule
     * @param evaluationResult true if the rule evaluated to true, false otherwise
     */    default void afterEvaluate(Rule rule, Facts facts, boolean evaluationResult) { }
 
    /**
     * Triggered on condition evaluation error due to any runtime exception.
     *
     * @param rule that has been evaluated
     * @param facts known while evaluating the rule
     * @param exception that happened while attempting to evaluate the condition.
     */    default void onEvaluationError(Rule rule, Facts facts, Exception exception) { }
 
    /**
     * Triggered before the execution of a rule.
     *
     * @param rule the current rule
     * @param facts known facts before executing the rule
     */    default void beforeExecute(Rule rule, Facts facts) { }
 
    /**
     * Triggered after a rule has been executed successfully.
     *
     * @param rule the current rule
     * @param facts known facts after executing the rule
     */    default void onSuccess(Rule rule, Facts facts) { }
 
    /**
     * Triggered after a rule has failed.
     *
     * @param rule the current rule
     * @param facts known facts after executing the rule
     * @param exception the exception thrown when attempting to execute the rule
     */    default void onFailure(Rule rule, Facts facts, Exception exception) { }
 
}

3. 示例

 <project xmlns="#; xmlns:xsi="#34;
  xsi:schemaLocation=" #;>
    <modelVersion>.0.0</modelVersion>
    <groupId>com.cjs.example</groupId>
    <artifactId>easy-rules-quickstart</artifactId>
    <version>.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>org.jeasy</groupId>
            <artifactId>easy-rules-core</artifactId>
            <version>.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.jeasy</groupId>
            <artifactId>easy-rules-support</artifactId>
            <version>.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.jeasy</groupId>
            <artifactId>easy-rules-mvel</artifactId>
            <version>.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.slfj</groupId>
            <artifactId>slfj-simple</artifactId>
            <version>.7.30</version>
        </dependency>
    </dependencies>
</project>

「 java架构师之路必备 」 Java规则引擎 Easy Rules

4. 扩展

规则本质上是一个函数，如y=f(x1,x2,..,xn)

规则引擎就是为了解决业务代码和业务规则分离的引擎，是一种嵌入在应用程序中的组件，实现了将业务决策从应用程序代码中分离。

还有一种常见的方式是Java+Groovy来实现，Java内嵌Groovy脚本引擎进行业务规则剥离。

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