基于redis的分布式锁

@Autowired
private RedissonClient redissonClient;

RLock rLock = redissonClient.getLock(RedisKeyPrefix.TRADE_PRODUCT_IN_LOCK.getVal() + tradeFinancingProduct.getId());

try{
    //尝试加锁30秒
   if (rLock.tryLock(30, TimeUnit.SECONDS)) {
        //some
    }else{
        throw new SysException("tradeProductIn - acquire lock fail");    
    } 
}catch(InterruptedException e){
    throw new SysException("tradeProductIn - InterruptedException");
}finally { 
    //释放分布式锁 
    if (rLock.isLocked() && rLock.isHeldByCurrentThread()) { 
        rLock.unlock(); log.info("tradeProductIn - lock release"); 
    } 
}

isHeldByCurrentThread():查询当前线程是否保持此锁定 
isFair():判断Lock是否为公平锁 
isLocked():查询lock 是否被任意线程所持有。

很好的介绍博客：https://www.jianshu.com/p/cde0700f0128