增加雪花算法https://gitee.com/yitter/idgenerator

增加对数据库主键为numberic的支持

Infrastructure/Snowflake/SnowWorkerM2.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Yitter.IdGenerator
+{
+    /// <summary>
+    /// 常规雪花算法
+    /// </summary>
+    internal class SnowWorkerM2 : SnowWorkerM1
+    {
+        public SnowWorkerM2(IdGeneratorOptions options) : base(options)
+        {
+
+        }
+
+        public override long NextId()
+        {
+            lock (_SyncLock)
+            {
+                long currentTimeTick = GetCurrentTimeTick();
+
+                if (_LastTimeTick == currentTimeTick)
+                {
+                    if (_CurrentSeqNumber++ > MaxSeqNumber)
+                    {
+                        _CurrentSeqNumber = MinSeqNumber;
+                        currentTimeTick = GetNextTimeTick();
+                    }
+                }
+                else
+                {
+                    _CurrentSeqNumber = MinSeqNumber;
+                }
+
+                if (currentTimeTick < _LastTimeTick)
+                {
+                    throw new Exception(string.Format("Time error for {0} milliseconds", _LastTimeTick - currentTimeTick));
+                }
+
+                _LastTimeTick = currentTimeTick;
+                var result = ((currentTimeTick << _TimestampShift) + ((long)WorkerId << SeqBitLength) + (uint)_CurrentSeqNumber);
+
+                return result;
+            }
+        }
+
+    }
+}