/
RedisLock.java
41 lines (37 loc) · 1.23 KB
/
RedisLock.java
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package love.wangqi.version1_1;
import love.wangqi.Lock;
import love.wangqi.LockTemplate;
import redis.clients.jedis.Jedis;
/**
* @author: wangqi
* @description:
* @date: Created in 2018/8/6 18:39
*/
public class RedisLock extends LockTemplate implements Lock {
@Override
protected Boolean lock(Jedis redis, String key, long timeout) {
long currentTimestamp = System.currentTimeMillis();
long newExpireTime = currentTimestamp + timeout;
if (redis.setnx(key, String.valueOf(newExpireTime)) == 0) {
String value = redis.get(key);
long oldExpireTime = value == null ? 0 : Long.valueOf(value);
if (oldExpireTime < currentTimestamp) {
String oldvalue = redis.getSet(key, String.valueOf(newExpireTime));
currentTimestamp = oldvalue == null ? 0 : Long.valueOf(oldvalue);
if (currentTimestamp == oldExpireTime) {
return true;
} else {
return false;
}
} else {
return false;
}
} else {
return true;
}
}
@Override
protected void unlock(Jedis redis, String key) {
redis.del(key);
}
}