package com.aps.common.redis.service;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.redis.core.RedisTemplate;
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import org.springframework.data.redis.core.script.DefaultRedisScript;
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import org.springframework.data.redis.core.script.RedisScript;
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import org.springframework.stereotype.Component;
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import java.time.Duration;
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import java.util.Collections;
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/**
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* Redis 分布式锁
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*
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**/
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@Component
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public class RedisLockUtils {
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@Autowired
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private RedisTemplate redisTemplate;
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//分布式锁过期时间 s 可以根据业务自己调节
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private static final Long LOCK_REDIS_TIMEOUT = 10L;
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//分布式锁休眠 至 再次尝试获取 的等待时间 ms 可以根据业务自己调节
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public static final Long LOCK_REDIS_WAIT = 500L;
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/**
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* 判断是否存在锁
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* */
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public boolean existLock(String key,String value){
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return this.redisTemplate.opsForValue().get(key).equals(value);
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}
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/**
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* 加锁
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**/
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public Boolean getLock(String key,String value,Long timeoutSeconds){
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Boolean lockStatus = this.redisTemplate.opsForValue().setIfAbsent(key,value, Duration.ofSeconds(timeoutSeconds));
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return lockStatus;
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}
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/**
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* 释放锁
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**/
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public Long releaseLock(String key,String value){
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String luaScript = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
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RedisScript<Long> redisScript = new DefaultRedisScript<>(luaScript,Long.class);
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Long releaseStatus = (Long)this.redisTemplate.execute(redisScript, Collections.singletonList(key),value);
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return releaseStatus;
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}
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}
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