// 获取指定key对应的主设备节点
private RedisClient GetRedisClient(string key)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key");
}
int slot = CRC16.GetSlot(key);
if (!_redisClientManagers.ContainsKey(slot))
{
throw new SlotNotFoundException(string.Format("No reachable node in cluster for slot {{{0}}}", slot), slot, key);
}
var pool = _redisClientManagers[slot];
return((RedisClient)pool.GetClient());
}
/// <summary>
/// 根据 key 计算对应的哈希槽
/// </summary>
public static int GetSlot(string key)
{
key = CRC16.ExtractHashTag(key);
// optimization with modulo operator with power of 2 equivalent to getCRC16(key) % 16384
return(GetCRC16(key) & (16384 - 1));
}