调整雪花算法

Infrastructure/Snowflake/Core/SnowWorkerM2.cs

@@ -0,0 +1,58 @@
+/*
+ * 版权属于：yitter(yitter@126.com)
+ * 开源地址：https://gitee.com/yitter/idgenerator
+ * 版权协议：MIT
+ * 版权说明：只要保留本版权，你可以免费使用、修改、分发本代码。
+ * 免责条款：任何因为本代码产生的系统、法律、政治、宗教问题，均与版权所有者无关。
+ * 
+ */
+
+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;
+            }
+        }
+
+    }
+}