一种基于Orleans的分布式Id生成方案

基于Orleans的分布式Id生成方案，因Orleans的单实例、单线程模型，让这种实现变的简单,贴出一种实现，欢迎大家提出意见

public interface ISequenceNoGenerator : Orleans.IGrainWithIntegerKey

{

   Task<Immutable<string>> GetNext();

}

public class SequenceNoGenerator : Orleans.Grain, ISequenceNoGenerator

 {

     private const int MaxSeed = ;

     private int _seed = ;

     private int _currentSecondCounter = ;

     Task<Immutable<string>> ISequenceNoGenerator.GetNext()

     {

         var oldCounter = this._currentSecondCounter;

         while (true)

         {

             this.UpdateCurrentTimestamp();

             if (oldCounter != this._currentSecondCounter)

                 this._seed = ;

             else

             {

                 ++this._seed;

             }

             if (this._seed > MaxSeed) Task.Delay();

             else break;

         }

         var seq = DateTime.Now.ToString("yyyyMMdd") + this._currentSecondCounter.ToString() + this._seed.ToString();

         return Task.FromResult(seq.AsImmutable());

     }

     public override Task OnActivateAsync()

     {

         //延迟1秒启动，防止Activation在某个机器上崩溃后，在集群中其它host上启动时，sequenceNo在同一秒出现重复

          Task.Delay();

         return base.OnActivateAsync();

     }

     private void UpdateCurrentTimestamp()

     {

         var currentTime = DateTime.Now;

         var currentDayStart = Convert.ToDateTime(currentTime.ToShortDateString());

         this._currentSecondCounter = (int)(new TimeSpan(currentTime.Ticks - currentDayStart.Ticks).TotalSeconds);

     }

 }