63 lines
2.0 KiB
C#
63 lines
2.0 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Threading.Tasks;
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using Sample.SqlServerShardingTable.Entities;
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using ShardingCore.Core.VirtualRoutes;
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using ShardingCore.Core.VirtualRoutes.TableRoutes.Abstractions;
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using ShardingCore.Helpers;
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namespace Sample.SqlServerShardingTable.VirtualRoutes
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{
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public class OrderHashRangeVirtualTableRoute:AbstractShardingOperatorVirtualTableRoute<Order,string>
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{
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protected override string ConvertToShardingKey(object shardingKey)
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{
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return shardingKey.ToString();
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}
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public override string ShardingKeyToTail(object shardingKey)
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{
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var stringHashCode = ShardingCoreHelper.GetStringHashCode("123");
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var hashCode = stringHashCode % 10000;
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if (hashCode >= 0 && hashCode <= 3000)
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{
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return "A";
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}
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else if (hashCode >= 3001 && hashCode <= 6000)
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{
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return "B";
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}
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else if (hashCode >= 6001 && hashCode <= 10000)
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{
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return "C";
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}
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else
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throw new InvalidOperationException($"cant calc hash route hash code:[{stringHashCode}]");
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}
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public override List<string> GetAllTails()
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{
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return new List<string>()
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{
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"A", "B", "C"
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};
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}
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protected override Expression<Func<string, bool>> GetRouteToFilter(string shardingKey, ShardingOperatorEnum shardingOperator)
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{
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//因为hash路由仅支持等于所以仅仅只需要写等于的情况
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var t = ShardingKeyToTail(shardingKey);
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switch (shardingOperator)
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{
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case ShardingOperatorEnum.Equal: return tail => tail == t;
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default:
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{
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return tail => true;
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}
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}
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}
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}
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}
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