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README
Apache-2.0

简介

u2-distributed-operator提供了一些分布式系统中常用的组件,解决方案,原理讲解,只需简单的配置便可使用

zookeeper分布式锁

基于zookeeper的分布式锁原理
1.注解
    lockName:锁名称,可以自定义锁名称,如果不定义,则自动生成
    LockType:锁类型,提供了多种锁类型,默认为可重入锁
    requireTime:获取锁时间,获取锁时间就是在这个时间范围内如果获取不到锁,则会退出,防止无休止的等待下去,造成阻塞
    unit:时间单位

public @interface U2Lock {
    /**
     * 锁名字
     */
    String lockName() default "";
    /**
     * 锁类型
     * @return
     */
    LockType lockType() default LockType.MUTEX_LOCK;
    /**
     * 时间
     */
    long requireTime() default 30000;
    /**
     * 时间单位
     */
    TimeUnit unit() default TimeUnit.MILLISECONDS;
}

2.yml配置
    配置zookeeper的一些连接连接属性,

u2-lock:
  address: 127.0.0.1:2181 #多机逗号隔开
  connection-timeout: 1500000000
  session-timeout: 600000
  retry-policy: retry-forever #重试策略
  retry-forever: #对应重试策略配置
    retry-interval-ms: 3000

3.使用

    @GetMapping("get")
    @U2Lock(lockName = "order-get",lockType = LockType.MUTEX_LOCK,requireTime = 50000)
    public Map<String,Object> lock(@RequestParam int id , @RequestParam String num){
        Map<String,Object> map = new HashMap<>();
        if (count > 0){
            count--;
            map.put("order_num",count);
            return map;
        }
        map.put("msg","商品已售罄");
        return map;
    }

Redisson分布式锁

1.注解
    lockType:所类型默认为可重入锁,还有其他锁可选
        公平锁(Fair Lock)
        联锁(MultiLock)
        红锁(RedLock)
        读写锁(ReadWriteLock)
    waitTime:等待时间,在这个时间范围内获取不到锁,则退出获取锁
    leaseTime:就是锁过期时间,达到这个时间,redis会删除这个key

public @interface U2Lock {
    /**
     * 锁类型
     * @return
     */
    LockType lockType() default LockType.REENTRANT_LOCK;
    /**
     * 等待时间
     * @return
     */
    long waitTime() default 25;
    /**
     * 释放锁时间
     * @return
     */
    long leaseTime() default 50;
    /**
     * 时间单位
     * @return
     */
    TimeUnit unit() default TimeUnit.SECONDS;
    /**
     * 锁名称
     * @return
     */
    String lockName() default "";

}

2.yml

u2-lock:
  pattern: SINGLE
  password: xiaosi520
  address: redis://101.200.54.149:6379
  idle-connection-timeout: 6000
  idle-size: 10

    pattern为redis模式,可单机(SINGLE),集群(CLUSTER),主从(MASTER_SLAVE),哨兵(SENTINEL),使用红锁pattern为RED_LOCK

红锁:
    基于Redis的Redisson红锁RedissonRedLock对象实现了Redlock介绍的加锁算法。该对象也可以用来将多个RLock对象关联为一个红锁,每个RLock对象实例可以来自于不同的Redisson实例,Martin Kleppmann建议红锁至少要5个redis节点以上。
红锁配置如下

u2-lock:
pattern: RED_LOCK
password: xiaosi520
address: redis://116.198.160.10:6379
red-lock:
- "redis://116.198.160.10:6379,123456" #123456为密码
- "redis://116.198.160.11:6379,123456"  
- "redis://116.198.160.12:6379,123456"  
- "redis://116.198.160.25:6379,123456"  
- "redis://116.198.160.20:6379,123456"  
    @GetMapping("test")
    @U2Lock(lockType = LockType.REENTRANT_LOCK,lockName = "red-lock")
    public void test() throws InterruptedException {
        
    }

防重提交

    无论是分布式系统还是单机系统,总会遇到表单按钮重复提交问题,前端可以进行控制,但是后端也必须进行控制,这里基于redis来进行防重

1.注解
    lockTime():在这段时间类,这个用户不能重复提交

public @interface U2RepeatSubmit {
    /**
     * 锁接口时间
     * @return
     */
    long lockTime() default 1000L;
    /**
     * 时间单位
     * @return
     */
    TimeUnit unit() default TimeUnit.MILLISECONDS;
    /**
     * 消息提醒
     * @return
     */
    String msg() default "请勿重复提交";

}

2.yml
    我们的项目和请求各不相同,所以可以基于参数防重,session会话,请求头,只需要携带能代表用户的唯一标识便可。

spring:
  redis:
    host: 127.0.0.1
    port: 6379
    password: 123456
repeat-submit: #防重提交
  identity: token  #唯一标识
  identity-location: header #参数位置 可为请求头header , 会话session , 请求参数parameter 

3.使用

@U2RepeatSubmit(lockTime = 2000)
    @GetMapping("submit")
    public void submit(@RequestParam("uid") String uid){
        
    }
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简介

分布式组件######################## 展开 收起
Java 等 2 种语言
Apache-2.0
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