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README
Apache-2.0

1.简介

spring-boot-starter-current-limiting:完美嵌入SpringBoot应用的分布式无锁限流插件,支持方法级别、系统级别限流,支持设置系统启动保护时间,提供快速失败与CAS阻塞两种限流方案,这些功能只需要导入依赖,简单配置即可使用。

1555848355646

2.Maven

<dependency>
  <groupId>cn.yueshutong</groupId>
  <artifactId>spring-boot-starter-current-limiting</artifactId>
  <version>0.0.2.RELEASE</version>
</dependency>

3.方法限流

在需要限流的方法上使用 @CurrentLimiter 注解,示例代码如下:

@RestController
public class MyController {

    @RequestMapping("/hello")
    @CurrentLimiter(QPS = 2)
    public String hello(){
        return "hello";
    }

}

@CurrentLimiter 注解参数说明:

属性 说明 默认值
QPS 每秒并发量 20
initialDelay 初始延迟时间
系统启动保护
0
failFast 开启快速失败
可切换为阻塞
true

4.系统限流

对整个应用的限流只需要在配置文件中配置即可,示例代码如下:

current.limiting.enabled=true
current.limiting.part-enabled=false
current.limiting.qps=100
current.limiting.fail-fast=true
current.limiting.initial-delay=0

参数说明:

属性 说明 默认值
enabled 开启全局限流 false
part-enabled 开启注解限流
可使注解失效
true
qps 每秒并发量 100
fail-fast 开启快速失败
可切换为阻塞
true
initial-delay 初始延迟时间
系统启动保护
0

5.拒绝策略

提供快速失败与CAS阻塞两种限流方案。如果是阻塞则不需要拒绝策略,当获取到令牌后依旧会继续执行,可以当做一种限制速率的措施。这里只讨论快速失败的拒绝策略。

快速失败的默认策略是统一返回“服务不可用”的英文说明文字,如果用户需要自定义拒绝策略,提供两种接口供实现。

针对被注解的方法进行自定义拒绝策略是实现CurrentAspectHandler接口,示例代码:

@Component
public class MyAspectHandler implements CurrentAspectHandler {
    @Override
    public Object around(ProceedingJoinPoint pjp, CurrentLimiter rateLimiter) throws Throwable {
        //被注解修饰的方法返回值,慎用!
        //可以结合Controller返回自定义视图
        return "fail";
    }
}

针对系统级别的拒绝策略是实现CurrentInterceptorHandler接口,示例代码:

@Component
public class MyInterceptorHandler implements CurrentInterceptorHandler {
    @Override
    public void preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        response.getWriter().print("fail");
    }

}

需要注意的是,以上实现类在Application中只能注入一个。

6.集群限流

集群限流的目的是对相同实例(即ApplicationName)的集群进行统一的限流,前提是已经开启并配置好Redis,直接开启即可:

spring.redis.host=127.0.0.1
spring.redis.password=
spring.redis.port=6379
#一行开启
current.limiting.cloud-enabled=true

例如QPS为2,两个实例组成集群,效果图如下:

7.更新日志

0.0.1.RELEASE:单机版限流,注解+全局配置

0.0.2.RELEASE:结合Redis实现集群限流

8.关于作者

博客:http://www.yueshutong.cn

邮箱:yster@foxmail.com

Github:https://github.com/yueshutong/spring-boot-starter-current-limiting

Gitee:https://gitee.com/zyzpp/spring-boot-starter-current-limiting

交流QQ群:781927207

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简介

基于令牌桶算法实现的SpringBoot分布式无锁限流插件,支持方法级别、系统级别的限流,提供快速失败与CAS阻塞两种方案,开箱即用!坚持做最专业的流控插件,更多功能更新中,欢迎提交Issues 展开 收起
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