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README
Apache-2.0

Elegent Idem【幂等性框架】

介绍

这是一个基于springboot的优雅的幂等性框架。使用这个组件可以让你更轻松、更优雅地在项目中实现接口幂等性处理,让你更专注业务代码的开发。它目前支持令牌和序列号两种检查策略。用户只需要在方法上添加一个注解,即可实现接口幂等性。

序列号(sn)检查策略

通过序列号机制实现接口的幂等性,示意图如下:

具体流程步骤:

  1. 客户端先请求服务端,会拿到一个能代表这次请求业务的唯一字段
  2. 将该字段以 SETNX 的方式存入 redis 中,并根据业务设置相应的超时时间
  3. 如果设置成功,证明这是第一次请求,则执行后续的业务逻辑
  4. 如果设置失败,则代表已经执行过当前请求,直接返回

令牌(token)检查策略

通过token 机制实现接口的幂等性,示意图如下:

具体流程步骤:

1.客户端会先发送一个请求去获取 token,服务端会生成一个全局唯一的 ID 作为 token 保存在 redis 中,同时把这个 ID 返回给客户端

2.客户端第二次调用业务请求的时候必须携带这个 token

3.服务端会校验这个 token,如果校验成功,则执行业务,并删除 redis 中的 token

4.如果校验失败,说明 redis 中已经没有对应的 token,则表示重复操作,直接返回指定的结果给客户端

使用说明

准备工作

1.在项目中引入依赖

<dependency>
    <groupId>cn.elegent.idem</groupId>
    <artifactId>elegent-idem-core</artifactId>
    <version>1.0.0</version>
</dependency>

2.在项目配置文件添加配置。 如果是本地redis,可缺省

elegent:
  data:
    type: redis
    redis:
      nodes: 127.0.0.1:6379

配置说明:

(1)data.type :指定数据中心的类型。默认值为redis。

(2)data.redis.nodes: redis节点,格式为{ip}:{port},{ip}:{port},{ip}:{port} ,默认值127.0.0.1:6379

接口幂等性实现

接口幂等性实现,只需要在方法上加上@ElegentIdem(type="sn" ,name="requestId")即可。如下例:

@ElegentIdem(type="sn" ,name="requestId")
public String testiu() throws InterruptedException {
    log.info("finish ...");
    return "OK";
}

type 为检查策略类型: 可选值: sn(序列号,缺省值) token (令牌)

name 为header 头信息的名字 ,缺省值为 requestId

用户扩展

用户自定义检查策略

接口幂等性框架目前提供了token、sn两种检查策略,用户也可以自行扩展,步骤如下:

(1)编写检查器类,实现Checker接口,参考以下代码:

/**
 * 用户自定义检查器
 */
@Component
@CheckerName("xxxx")
public class XXXXChecker implements Checker {

    @Override
    public boolean check(String uniqueID) {
        //todo: 编写幂等检查逻辑,返回true表示可以访问,返回false表示不可以访问
    }

    @Override
    public void afterSuccess(String uniqueID) {
		//todo: 接口成功执行后,后续的逻辑处理
    }

}

xxxx指定的就是你想扩展的检查策略名称,名字自定义。

(2)如果应用这个检查策略,在使用注解时指定即可

@ElegentIdem(type="xxxx" ,name="requestId")

用户自定义标识器

用户编写类实现UniqueID接口,即可覆盖默认的实现

@Component
public class XXXXXXUniqueID implements UniqueID {

    /**
     * 获取唯一id的方法
     * @return
     */
    @Override
    public String getUniqueID(String  name) {
		
    }
}

用户自定义异常处理器

用户编写类实现 ExceptionManager接口,即可覆盖默认的实现

@Component
public class XXXXXXExceptionManager implements ExceptionManager {

    /**
     * 出现重复请求的时候封装的处理逻辑
     */
    @Override
    public void interfaceDempotenceHandler() {
        
    }

}

参与贡献

  1. 从 master 分支 checkout 一个新分支(请务必保证 master 代码是最新的
  2. 新分支命名格式:docs/username_description,例如:docs/tom_新增分布式锁配置项
  3. 在新分支上编辑文档、代码,并提交代码
  4. 最后 PR 合并到 develop 分支,等待作者合并即可
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简介

这是一个基于springboot的优雅的幂等性框架。使用这个组件可以让你更轻松、更优雅地在项目中实现接口幂等性处理,让你更专注业务代码的开发。它目前支持令牌和序列号两种检查策略。用户只需要在方法上添加一个注解,即可实现接口幂等性。 展开 收起
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