easy-rules 提供了方便的注解，我们可以直接基于pojo编写rule
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.
?
}
@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
}
?
}
Rule rule = new RuleBuilder()
.name("myRule")
.description("myRuleDescription")
.priority(3)
.when(condition)
.then(action1)
.then(action2)
.build();
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)"
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 \")"
]
}
https://github.com/j-easy/easy-rules/wiki/defining-rules
原文：https://www.cnblogs.com/rongfengliang/p/12693520.html