public T GetNodeForKey(string key)
{
if (!Ring.Any())
throw new InvalidOperationException("Can not find the available nodes, please call the AddNode method to add nodes.");
var hash = HashAlgorithm.Hash(key);
if (Ring.ContainsKey(hash))
return Ring[hash];
var node = Ring.Where(p => p.Key > hash).OrderBy(i => i.Key).Select(p => p.Value).FirstOrDefault();
if (node != null)
return node;
return Ring.FirstOrDefault().Value;
}