easy-rules rule 格式说明

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easy-rules 提供了方便的注解，我们可以直接基于pojo编写rule

rule 方法签名

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.

​

}

pojo 注解模式

• 参考

@Rule(name = "my rule", description = "my rule description", priority = 1)

public class MyRule {

​

    @Condition

    public boolean when(@Fact("fact") Facts fact) {

        //my rule conditions

        return true;

    }

​

    @Action(order = 1)

    public void then(@Fact("fact") Facts fact) throws Exception {

        //my actions

    }

​

    @Action(order = 2)

    public void finally() throws Exception {

        //my final actions

    }

​

}

RuleBuilder 模式

Rule rule = new RuleBuilder()

                .name("myRule")

                .description("myRuleDescription")

                .priority(3)

                .when(condition)

                .then(action1)

                .then(action2)

                .build();

yaml 格式

参考如下,理论上是一种扩展

name: "5"

description: "5"

condition: "user.name.length<30"

priority: 5

actions:

  - "UserService.doAction4(user.userinfo)"

json 格式

同yaml 格式一样，也是一种扩展

{

    "name": "3",

    "description": "3",

    "condition": "user.name.length<50",

    "priority": 3,

    "actions": [

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

    ]

}

参考资料

https://github.com/j-easy/easy-rules/wiki/defining-rules

来源：oschina

链接：https://my.oschina.net/u/4374544/blog/3234162