Easyrule是个规则引擎，类似于drools，我们来熟悉一下这个东西

[ ] 一个简单实例规则，这个规则会被一直触发，然后行为是打印helloWorld

@Rule(name="helloWorld",description = "总是打印helloWorld")

public class HelloWorldRule {

    @Condition

    public boolean when(){

        return true;

    }

    @Action

    public void then(){

        System.out.println("hello world");

    }

}

public class DemoLauncher {

    public static void main(String[] args) {

        Facts facts=new Facts();

        //规则集合定义并注册

        Rules rules=new Rules();

        rules.register(new HelloWorldRule());

        //创建一个规则引擎，并驱动rules

        RulesEngine rulesEngine=new DefaultRulesEngine();

				//执行

        rulesEngine.fire(rules,facts);

    }

}

日志打印：

```
hello world
```

配上日志包，观察下框架的日志

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Engine parameters { skipOnFirstAppliedRule = false, skipOnFirstNonTriggeredRule = false, skipOnFirstFailedRule = false, priorityThreshold = 2147483647 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Registered rules:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = 'helloWorld', description = '总是打印helloWorld', priority = '2147483646'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Known facts:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rules evaluation started

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule 'helloWorld' triggered

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule 'helloWorld' performed successfully

hello world

org.slf4j.simpleLogger.defaultLogLevel=debug

[ ] FizzBuzz : 数字从一到100 当能被5整除的时候发出fizz，被7整除时候发出buzz,同时被5和7整除就发出fizzbuzz

java简单实现：循环然后用ifelse判断该怎么处理

public class JavaDeme {

    public static void main(String[] args) {

        for(int i=0;i<100;i++){

            if(i%5==0&&i%7==0){

                System.out.println("fizzbuzz"+":"+i);

            }else if(i%5==0){

                System.out.println("fizz:"+i);

            }else if(i%7==0){

                System.out.println("buzz:"+i);

            }else{

                //System.out.println("啥也不是"+i);

            }

          //  System.out.println();

        }

    }

}

easyrule实现先为每个规则写个rule

FizzRule

@Rule

public class FizzRule {

    @Condition

    public boolean isFizz(@Fact("number") Integer number) {

        return number % 5 == 0;

    }

    @Action

    public void printFizz() {

        System.out.print("fizz");

    }

		// 优先级为1

    @Priority

    public int getPriority() {

        return 1;

    }

}

BuzzRule

@Rule

public classBuzzRule {

    @Condition

public booleanisBuzz(@Fact("number") Integer number) {

returnnumber % 7 == 0;

    }

    @Action

public voidprintBuzz() {

        System.out.print("buzz");

    }

    //优先级2

    @Priority

public intgetPriority() {

return2;

    }

}

FizzBuzzRule ：BuzzRule,和FizzRule 整合的规则

public class FizzBuzzRule extends UnitRuleGroup {

    public FizzBuzzRule(Object... rules){

        for(Object rule:rules){

            addRule(rule);

        }

    }

    @Override

    public int getPriority(){

        return 0;

    }

}

两个规则都不符合

@Rule

public class NonFizzBuzzRule {

    @Condition

    public boolean isNotFizzNorBuzz(@Fact("number") Integer number){

        // can return true, because this is the latest rule to trigger according to assigned priorities

        // and in which case, the number is not fizz nor buzz

        return number % 5 != 0 || number % 7 != 0;

    }

    @Action

    public void printInput(@Fact("number") Integer number) {

        System.out.print(number);

    }

    @Priority

    public int getPriority() {

        return 3;

    }

}

主方法入口：

public class FizzBuzzWithEasyRules {

    public static void main(String[] args) {

        RulesEngineParameters parameters=new RulesEngineParameters();

        // 满足第一个规则就退出

        parameters.setSkipOnFirstAppliedRule(true);

        // 引擎

        RulesEngine rulesEngine=new DefaultRulesEngine();

				//RulesEngine rulesEngine=new DefaultRulesEngine(parameters);

        // 规则

        Rules rules=new Rules();

        rules.register(new FizzRule());

        rules.register(new BuzzRule());

        rules.register(new FizzBuzzRule(new FizzRule(),new BuzzRule()));

        rules.register(new NonFizzBuzzRule());

        //匹配规则

        Facts facts=new Facts();

        for(int i=0;i<100;i++){

            facts.put("number",i);

            rulesEngine.fire(rules,facts);

            System.out.println();

        }

    }

}

日志

31

32

33

34

fizzbuzzfizzbuzz  // 这里打印了两边，因为引擎参数没有把跳出判断加上

36

37

38

39

fizz40

31

32

33

34

fizzbuzz

36

37

38

[ ] shop：这个示例展示MVEL表达式在EasyRules中的应用，这里示例我们实现一个功能：小商店卖酒，不能卖给未成年人（法定年龄小于18岁的人）

定义一个人的对象

@Data

public class Person {

    private String name;

    private int age;

    private boolean adult;

}

MVEL 表达式来写一个规则，这个规则做两件事，首先判断人是不是18岁以上，如果是我们将人的adult属性修改为true,成年人。买酒的行为判断人是否成年如果未成年则拒绝。

Rule ageRule=new MVELRule()

                .name("年龄规则")

                .description("检查用户年龄是否大于18岁")

                .priority(1)

                .when("person.age > 18")

                .then("person.setAdult(true);");

另外一个规则，是否可以买酒，这次用一个另外的方式来配置规则，写yml文件的方式代码如下：

name: "alcohol rule"

description: "小孩子不能喝酒"

priority: 2

condition: "person.isAdult()==false"

# 这里是actions数组类型-容易写成action

actions:

  - "System.out.println(\\"Shop: Sorry, you are not allowed to buy alcohol\\");"

运行：用MVELRuleFactory加载规则

public class MvelRuleDemo {

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

        Rule ageRule=new MVELRule()

                .name("年龄规则")

                .description("检查用户年龄是否大于18岁")

                .priority(1)

                .when("person.age > 18")

                .then("person.setAdult(true);");

        //定义工厂类

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

        URL url = MvelRuleDemo.class.getClassLoader().getResource("rule/alcohol-rule.yml");

        Rule alcoholRule = ruleFactory.createRule(new FileReader(url.getPath()));

        // 规则合集

        Rules rules=new Rules();

        rules.register(ageRule);

        rules.register(alcoholRule);

        //规则引擎

        RulesEngine rulesEngine=new DefaultRulesEngine();

        // 实例

        System.out.println("来判断接下来的客人能不能买酒");

        Person p=new Person();

        p.setAge(17);

        p.setName("小李");

        Facts facts=new Facts();

        facts.put("person",p);

        // 执行

        rulesEngine.fire(rules,facts);

    }

}

来判断接下来的客人能不能买酒

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Engine parameters { skipOnFirstAppliedRule = false, skipOnFirstNonTriggeredRule = false, skipOnFirstFailedRule = false, priorityThreshold = 2147483647 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Registered rules:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = '年龄规则', description = '检查用户年龄是否大于18岁', priority = '1'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = 'alcohol rule', description = '小孩子不能喝酒', priority = '2'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Known facts:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Fact { person : Person(name=小李, age=17, adult=false) }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rules evaluation started

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '年龄规则' has been evaluated to false, it has not been executed

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule 'alcohol rule' triggered

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule 'alcohol rule' performed successfully

Shop: Sorry, you are not allowed to buy alcohol

修改为19岁后执行-执行完打印一下用户信息，发现用户的成年状态被修改了

来判断接下来的客人能不能买酒

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Engine parameters { skipOnFirstAppliedRule = false, skipOnFirstNonTriggeredRule = false, skipOnFirstFailedRule = false, priorityThreshold = 2147483647 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Registered rules:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = '年龄规则', description = '检查用户年龄是否大于18岁', priority = '1'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = 'alcohol rule', description = '小孩子不能喝酒', priority = '2'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Known facts:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Fact { person : Person(name=小李, age=19, adult=false) }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rules evaluation started

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '年龄规则' triggered

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '年龄规则' performed successfully

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule 'alcohol rule' has been evaluated to false, it has not been executed

Person(name=小李, age=19, adult=true)

[ ] InferenceRulesEngine 持续对已知事实应用规则，直到不再应用规则为止，上面的例子们引擎由默认改为这个的话，代码停不下来，可以试一下，源码也可以读一下处理方式由很大不同。

default

@Override

    public void fire(Rules rules, Facts facts) {

        triggerListenersBeforeRules(rules, facts);

        doFire(rules, facts);

        triggerListenersAfterRules(rules, facts);

    }

    void doFire(Rules rules, Facts facts) {

        if (rules.isEmpty()) {

            LOGGER.warn("No rules registered! Nothing to apply");

            return;

        }

        logEngineParameters();

        log(rules);

        log(facts);

        LOGGER.debug("Rules evaluation started");

        for (Rule rule : rules) {

            final String name = rule.getName();

            final int priority = rule.getPriority();

            if (priority > parameters.getPriorityThreshold()) {

                LOGGER.debug("Rule priority threshold ({}) exceeded at rule '{}' with priority={}, next rules will be skipped",

                        parameters.getPriorityThreshold(), name, priority);

                break;

            }

            if (!shouldBeEvaluated(rule, facts)) {

                LOGGER.debug("Rule '{}' has been skipped before being evaluated",

                    name);

                continue;

            }

            if (rule.evaluate(facts)) {

                LOGGER.debug("Rule '{}' triggered", name);

                triggerListenersAfterEvaluate(rule, facts, true);

                try {

                    triggerListenersBeforeExecute(rule, facts);

                    rule.execute(facts);

                    LOGGER.debug("Rule '{}' performed successfully", name);

                    triggerListenersOnSuccess(rule, facts);

                    if (parameters.isSkipOnFirstAppliedRule()) {

                        LOGGER.debug("Next rules will be skipped since parameter skipOnFirstAppliedRule is set");

                        break;

                    }

                } catch (Exception exception) {

                    LOGGER.error("Rule '" + name + "' performed with error", exception);

                    triggerListenersOnFailure(rule, exception, facts);

                    if (parameters.isSkipOnFirstFailedRule()) {

                        LOGGER.debug("Next rules will be skipped since parameter skipOnFirstFailedRule is set");

                        break;

                    }

                }

            } else {

                LOGGER.debug("Rule '{}' has been evaluated to false, it has not been executed", name);

                triggerListenersAfterEvaluate(rule, facts, false);

                if (parameters.isSkipOnFirstNonTriggeredRule()) {

                    LOGGER.debug("Next rules will be skipped since parameter skipOnFirstNonTriggeredRule is set");

                    break;

                }

            }

        }

    }

inferenceRulesEngine：只是在默认的执行外包装了以下一下代码

@Override

    public void fire(Rules rules, Facts facts) {

        Set<Rule> selectedRules;

        do {

            LOGGER.debug("Selecting candidate rules based on the following facts: {}", facts);

            selectedRules = selectCandidates(rules, facts);

            if(!selectedRules.isEmpty()) {

								// 这个delegate就是上面默认的规则引擎

                delegate.fire(new Rules(selectedRules), facts);

            } else {

                LOGGER.debug("No candidate rules found for facts: {}", facts);

            }

        } while (!selectedRules.isEmpty());

    }

    private Set<Rule> selectCandidates(Rules rules, Facts facts) {

        Set<Rule> candidates = new TreeSet<>();

        for (Rule rule : rules) {

            if (rule.evaluate(facts)) {

                candidates.add(rule);

            }

        }

        return candidates;

    }

示例展示一个空调系统，当温度过高时不断降温操作直至温度降低到合适的度数，

创建一个条件类，来决定什么时候是热

public class HighTemperatureConditon implements org.jeasy.rules.api.Condition {

    // 中文意思评估评定-

    @Override

    public boolean evaluate(Facts facts) {

        Integer temperature=facts.get("temperature");

        return temperature>25;

    }

    static HighTemperatureConditon itIsHot(){

        return new HighTemperatureConditon();

    }

}

action类，满足条件后的执行内容

public class DecreaseTemperactureAction implements org.jeasy.rules.api.Action {

    @Override

    public void execute(Facts facts) throws Exception {

        System.out.println("温度过高-降温");

        Integer temperature=facts.get("temperature");

        facts.put("temperature",temperature-1);

    }

    static DecreaseTemperactureAction decreaseTemperacture(){

        return new DecreaseTemperactureAction();

    }

}

执行类-我们注册规则指定规则的触发条件为温度过高，rule.evaluate 方法，然后then执行的结果是：action.execute

public class AirLauncherDemo {

    public static void main(String[] args) {

        Facts facts=new Facts();

        facts.put("temperature",30);

        // 规则

        Rule airRule=  new RuleBuilder()

                .name("空调测试")

                .when(HighTemperatureConditon.itIsHot())

                .then(DecreaseTemperactureAction.decreaseTemperacture())

                .build();

        Rules rules=new Rules();

        rules.register(airRule);

        //inference引擎，持续不断的执行

        RulesEngine rulesEngine=new InferenceRulesEngine();

        rulesEngine.fire(rules,facts);

        System.out.println(facts.get("temperature").toString());

    }

}

日志-我们发现一直降温到25度

[main] DEBUG org.jeasy.rules.core.InferenceRulesEngine - Selecting candidate rules based on the following facts: [ { temperature : 30 } ]

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Engine parameters { skipOnFirstAppliedRule = false, skipOnFirstNonTriggeredRule = false, skipOnFirstFailedRule = false, priorityThreshold = 2147483647 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Registered rules:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = '空调测试', description = 'description', priority = '2147483646'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Known facts:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Fact { temperature : 30 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rules evaluation started

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' triggered

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' performed successfully

[main] DEBUG org.jeasy.rules.core.InferenceRulesEngine - Selecting candidate rules based on the following facts: [ { temperature : 29 } ]

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Engine parameters { skipOnFirstAppliedRule = false, skipOnFirstNonTriggeredRule = false, skipOnFirstFailedRule = false, priorityThreshold = 2147483647 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Registered rules:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = '空调测试', description = 'description', priority = '2147483646'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Known facts:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Fact { temperature : 29 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rules evaluation started

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' triggered

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' performed successfully

[main] DEBUG org.jeasy.rules.core.InferenceRulesEngine - Selecting candidate rules based on the following facts: [ { temperature : 28 } ]

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Engine parameters { skipOnFirstAppliedRule = false, skipOnFirstNonTriggeredRule = false, skipOnFirstFailedRule = false, priorityThreshold = 2147483647 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Registered rules:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = '空调测试', description = 'description', priority = '2147483646'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Known facts:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Fact { temperature : 28 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rules evaluation started

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' triggered

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' performed successfully

[main] DEBUG org.jeasy.rules.core.InferenceRulesEngine - Selecting candidate rules based on the following facts: [ { temperature : 27 } ]

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Engine parameters { skipOnFirstAppliedRule = false, skipOnFirstNonTriggeredRule = false, skipOnFirstFailedRule = false, priorityThreshold = 2147483647 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Registered rules:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = '空调测试', description = 'description', priority = '2147483646'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Known facts:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Fact { temperature : 27 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rules evaluation started

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' triggered

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' performed successfully

[main] DEBUG org.jeasy.rules.core.InferenceRulesEngine - Selecting candidate rules based on the following facts: [ { temperature : 26 } ]

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Engine parameters { skipOnFirstAppliedRule = false, skipOnFirstNonTriggeredRule = false, skipOnFirstFailedRule = false, priorityThreshold = 2147483647 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Registered rules:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule { name = '空调测试', description = 'description', priority = '2147483646'}

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Known facts:

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Fact { temperature : 26 }

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rules evaluation started

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' triggered

[main] DEBUG org.jeasy.rules.core.DefaultRulesEngine - Rule '空调测试' performed successfully

[main] DEBUG org.jeasy.rules.core.InferenceRulesEngine - Selecting candidate rules based on the following facts: [ { temperature : 25 } ]

[main] DEBUG org.jeasy.rules.core.InferenceRulesEngine - No candidate rules found for facts: [ { temperature : 25 } ]

温度过高-降温

温度过高-降温

温度过高-降温

温度过高-降温

温度过高-降温

25

这个示例说明，InferenceRulesEngine 会不断的重新进行判断执行，所以必须在满足条件执行的操作中修改自身实例。不然会崩溃

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