实现redis分布式锁

因项目需要，需要对缓存中数据进行频繁的读写操作，为了防止并发写覆盖问题，在程序中加了redis实现的分布式锁来控制并发写的场景。

先上代码，后期更新。

/**
 * 更新二维码中已使用次数
 *
 * @param request
 */
private void updateRechargeCodeCache(RechargeByCodeRequest request) {
    // 最大重试次数
    int retryTimes = 10;
    // 获取二维码信息
    String lockKey = "recharge_card_" + request.getChannel() + "_" + request.getRechargeCode() + "_lock";
    String rechargeCodeKey = "recharge_card_" + request.getChannel() + "_" + request.getRechargeCode();
    LoggerUtils.logBizInfo("updateRechargeCodeCache,lockKey:" + lockKey + "rechargeCodeKey:" + rechargeCodeKey);
    try {
        for (int i=0; i<retryTimes; i++) {
            // 获取分布式锁
            if (marketCacheService.setnx(lockKey, "1", 1L, TimeUnit.SECONDS)) {
                LoggerUtils.logBizInfo("updateRechargeCodeCache,lockKey:" + lockKey + ",加锁成功");
                String rechargeCodeValue = marketCacheService.get(rechargeCodeKey);
                LoggerUtils.logBizInfo("updateRechargeCodeCache,更新前:" + rechargeCodeValue);
                if (StringUtils.isEmpty(rechargeCodeValue)) {
                    throw new MarketApplicationException(MktResultCodeEnum.SCAN_CODE_INVALID);
                }
                RechargeCodeModel rechargeCodeModel = BaseDto.fromJson(rechargeCodeValue, new TypeReference<RechargeCodeModel>() {});
                // 更新二维码使用次数
                rechargeCodeModel.setUsedTimes(rechargeCodeModel.getUsedTimes() + 1);
                marketCacheService.set(rechargeCodeKey, rechargeCodeModel.toString(), 60L, TimeUnit.DAYS);
                LoggerUtils.logBizInfo("updateRechargeCodeCache,更新后:" + marketCacheService.get(rechargeCodeKey));
                // 删除分布式锁
                marketCacheService.delete(lockKey);
                LoggerUtils.logBizInfo("updateRechargeCodeCache,lockKey:" + lockKey + ",删除锁成功");
 
                break;
            } else {
                LoggerUtils.logBizInfo("updateRechargeCodeCache,lockKey:" + lockKey + ",加锁失败,重试次数:" + i);
                // 休眠10毫秒后重试
                Thread.sleep(10L);
            }
        }
    } catch (Exception e) {
        LoggerUtils.logBizError("更新二维码中已使用次数失败：" + e);
    }
}