easy-rules rule 格式说明

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