Redisson分布式锁----shock wave 2

参考

• blog.csdn.net/asd05137730…

环境

• springcloud
• redisson3.16.1
• redis
• docker

常见分布式锁方案对比

而redisson保持了简单易用、支持锁重入、支持阻塞等待、Lua脚本原子操作

实现

依赖

<!-- https://mvnrepository.com/artifact/org.redisson/redisson -->
<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.16.1</version>
</dependency>

NoRepeatSubmit

package org.example.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD) // 作用到方法上
@Retention(RetentionPolicy.RUNTIME) // 运行时有效
public @interface NoRepeatSubmit {
    int timeout() default 3000;
    String key() default "";
}

NoRepeatSubmitAop

package org.example.aop;

import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.example.annotation.NoRepeatSubmit;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.concurrent.TimeUnit;

@Aspect
@Component
@Slf4j
public class NoRepeatSubmitAop {

    @Autowired
    private RedissonClient redissonClient;

    @Around("execution(* org.example..*Controller.*(..)) && @annotation(nrs)")
    public Object arround(ProceedingJoinPoint pjp, NoRepeatSubmit nrs) {
        String key = nrs.key();
        RLock rLock = redissonClient.getLock(key);
        Object obj = null;
        try {
            boolean isLock = rLock.tryLock(0,nrs.timeout(), TimeUnit.SECONDS);
            if (isLock) {
                obj =  pjp.proceed();
            }
        } catch (Throwable e) {
            e.printStackTrace();
            log.error("验证重复提交时出现未知异常!");
            return null;
        }finally {
            if(rLock.isHeldByCurrentThread()){ // 时候是当前执行线程的锁
                rLock.unlock(); // 释放锁
            }
        }
        return obj;
    }
}

使用