easy-rules 提供了方便的注解，我們可以直接基於pojo編寫rule
rule 方法簽名
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
- 參考
@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
參考如下,理論上是一種擴展
name: "5"
description: "5"
condition: "user.name.length<30"
priority: 5
actions:
- "UserService.doAction4(user.userinfo)"
json 格式
同yaml 格式一樣，也是一種擴展
{
"name": "3",
"description": "3",
"condition": "user.name.length<50",
"priority": 3,
"actions": [
"System.out.println(\"default rule3 \")"
]
}