// 分布式锁前缀
private static final String LOCK_KEY_PREFIX = "inventory:lock:";
// 库存缓存前缀
private static final String INVENTORY_CACHE_PREFIX = "inventory:stock:";
// 锁单超时时间(毫秒)
private static final long LOCK_EXPIRE_TIME = 10 * 60 * 1000;
@Override
@Transactional(rollbackFor = Exception.class)
public boolean lockInventory(Long orderId, Long productId, Integer quantity) {
// 生成锁键
String lockKey = LOCK_KEY_PREFIX + productId;
// 获取分布式锁,防止并发超卖
boolean acquired = redisLock.tryLock(lockKey, 5000, 30000);
if (!acquired) {
log.warn("获取商品[{}]锁失败,可能有其他线程正在处理库存", productId);
return false;
}
try {
// 检查库存是否充足
Integer currentStock = getCurrentInventoryFromDB(productId);
if (currentStock == null || currentStock < quantity) {
log.info("商品[{}]库存不足,当前库存: {}, 请求数量: {}", productId, currentStock, quantity);
return false;
}
// 创建锁单记录
LockRecord lockRecord = new LockRecord();
lockRecord.setOrderId(orderId);
lockRecord.setProductId(productId);
lockRecord.setQuantity(quantity);
lockRecord.setCreateTime(new Date());
lockRecord.setExpireTime(new Date(System.currentTimeMillis() + LOCK_EXPIRE_TIME));
lockMapper.insert(lockRecord);
// 扣减库存
int rows = productMapper.reduceInventory(productId, quantity);
if (rows <= 0) {
log.error("扣减商品[{}]库存失败,可能是库存不足", productId);
throw new RuntimeException("扣减库存失败");
}
// 更新缓存
updateInventoryCache(productId);
return true;
} finally {
// 释放锁
redisLock.unlock(lockKey);
}
}
锁单、减库存
于 2025-06-12 14:40:53 首次发布