refactor(interest): 新增利息腿策略接口 + 3个活跃mode实现
为拆三类腿做准备,按 Strategy 模式封装 CalcNotionalByMode 的 switch。 本次零生产代码改动,全部为新增小文件,每个类单一职责<50行。 新增(策略接口+值对象): - InterestLegs/IInterestLegStrategy.cs NotionalResult 值对象(closePrincipal/posiPrincipal/closePercent) + IInterestLegStrategy 接口(每个mode一个实现) 新增(3个活跃利息腿mode): - InterestLegs/FixedNotionalLeg.cs mode 1 固定值 计息基数恒=InterestPrincipalFix, 不随平仓比例变化(合同写死的固定值) - InterestLegs/ContractNotionalLeg.cs mode 2 合约名义本金规模 平仓本金=posiNotional×closePercent, 按比例线性缩放 - InterestLegs/UnderlyingFullPriceLeg.cs mode 9 标的期初全价 主路径公式同mode2, 差异在衡泰路径grossPrice折算+EOD复利反推 确认现状: - 界面实际只有3个活跃利息腿mode(1/2/9), TradeView.cshtml:330-349 - mode 3(持仓名义本金)/4(持仓市值) 零引用=死代码, 本次不实现 - mode 7/8(多空存续) 界面已注释掉, 本次不实现 - mode 5/6(预付金) 属保证金维度, 后续单独做PrepayLeg 新增测试(8个,全过): - InterestLegStrategyTest.cs 覆盖各mode的部分平仓/全平/零平仓场景 验证策略行为与现有CalcNotionalByMode switch完全一致
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using System;
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using YLErp.DBModels.Enums;
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using YLErp.Modules.SwapModule.InterestLegs;
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namespace UnitTestProject.Modules.SwapModule.InterestLegs
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{
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/// <summary>
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/// 利息腿策略单测。验证每个策略的 CalcNotional 与现有 CalcNotionalByMode switch 完全一致。
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/// 这组测试是后续"迁移调用点"的安全网——迁移前后行为必须不变。
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/// </summary>
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[TestClass]
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public class InterestLegStrategyTest
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{
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private const decimal Fix = 2_000_000m; // 合约固定本金
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private const decimal Notional = 100_000_000m; // 剩余名义本金 1 亿
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private const decimal LongNotional = 60_000_000m;
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private const decimal ShortNotional = 40_000_000m;
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#region 固定值(mode 1):恒=Fix,不随比例变
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[TestMethod]
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public void 固定值_部分平仓_计息基数恒等于Fix()
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{
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var leg = new FixedNotionalLeg();
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var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 0.5m);
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Assert.AreEqual(Fix, r.ClosePrincipal, "平仓本金恒=Fix");
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Assert.AreEqual(Fix, r.PosiPrincipal, "持仓本金恒=Fix");
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Assert.AreEqual(1m, r.ClosePercent, "有效比例恒=1(固定值不随比例缩放)");
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}
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[TestMethod]
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public void 固定值_全平_计息基数仍等于Fix()
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{
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var leg = new FixedNotionalLeg();
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var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 1m);
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Assert.AreEqual(Fix, r.ClosePrincipal, "全平本金仍=Fix");
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}
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#endregion
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#region 合约名义本金规模(mode 2):按比例线性缩放
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[TestMethod]
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public void 合约名义本金_部分平仓_本金按比例缩放()
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{
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var leg = new ContractNotionalLeg();
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var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 0.5m);
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Assert.AreEqual(50_000_000m, r.ClosePrincipal, "平仓本金=Notional×50%");
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Assert.AreEqual(Notional, r.PosiPrincipal, "持仓本金=Notional全额");
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Assert.AreEqual(0.5m, r.ClosePercent, "有效比例=入参");
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}
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[TestMethod]
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public void 合约名义本金_全平_本金等于全额()
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{
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var leg = new ContractNotionalLeg();
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var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 1m);
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Assert.AreEqual(Notional, r.ClosePrincipal, "全平本金=Notional");
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}
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[TestMethod]
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public void 合约名义本金_零平仓_本金为零()
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{
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var leg = new ContractNotionalLeg();
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var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 0m);
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Assert.AreEqual(0m, r.ClosePrincipal, "零平仓本金=0");
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Assert.AreEqual(Notional, r.PosiPrincipal, "持仓本金仍=Notional");
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}
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#endregion
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#region 标的期初全价(mode 9):主路径公式与mode2相同
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[TestMethod]
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public void 标的期初全价_部分平仓_主路径公式同mode2()
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{
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var leg = new UnderlyingFullPriceLeg();
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var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 0.5m);
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Assert.AreEqual(50_000_000m, r.ClosePrincipal, "平仓本金=Notional×50%(与mode2主路径一致)");
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Assert.AreEqual(Notional, r.PosiPrincipal);
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Assert.AreEqual(0.5m, r.ClosePercent);
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}
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[TestMethod]
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public void 标的期初全价_全平_本金等于全额()
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{
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var leg = new UnderlyingFullPriceLeg();
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var r = leg.CalcNotional(Fix, Notional, LongNotional, ShortNotional, 1m);
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Assert.AreEqual(Notional, r.ClosePrincipal);
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}
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#endregion
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#region 守卫:三个策略对应不同mode
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[TestMethod]
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public void 三个策略对应不同枚举值()
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{
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Assert.AreEqual(InterestModeEnum.固定值, new FixedNotionalLeg().Mode);
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Assert.AreEqual(InterestModeEnum.合约名义本金规模, new ContractNotionalLeg().Mode);
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Assert.AreEqual(InterestModeEnum.标的期初全价, new UnderlyingFullPriceLeg().Mode);
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}
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#endregion
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}
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}
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using YLErp.DBModels;
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namespace YLErp.Modules.SwapModule.InterestLegs;
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/// <summary>
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/// 合约名义本金规模利息腿(InterestMode=合约名义本金规模)。
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/// 站在"合约规模"视角:平仓本金 = 剩余名义本金 × 平仓比例。
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/// 与标的期初全价(9)在 CalcNotionalByMode 里公式相同,差异在衡泰路径 grossPrice 折算和 EOD 复利反推。
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/// </summary>
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public sealed class ContractNotionalLeg : IInterestLegStrategy
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{
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public InterestModeEnum Mode => InterestModeEnum.合约名义本金规模;
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public NotionalResult CalcNotional(decimal fix, decimal posiNotional, decimal posiLong, decimal posiShort, decimal closePercent)
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=> new(posiNotional * closePercent, posiNotional, closePercent);
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}
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using YLErp.DBModels;
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namespace YLErp.Modules.SwapModule.InterestLegs;
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/// <summary>
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/// 固定值利息腿(InterestMode=固定值)。
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/// 计息基数由合约约定(InterestPrincipalFix),无论平仓比例多少都恒等于该值。
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/// 业务规则:固定值就是合同写死的固定值,永远不变。
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/// </summary>
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public sealed class FixedNotionalLeg : IInterestLegStrategy
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{
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public InterestModeEnum Mode => InterestModeEnum.固定值;
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public NotionalResult CalcNotional(decimal fix, decimal posiNotional, decimal posiLong, decimal posiShort, decimal closePercent)
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=> new(fix, fix, 1m);
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}
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using YLErp.DBModels;
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namespace YLErp.Modules.SwapModule.InterestLegs;
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/// <summary>
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/// 计息腿策略的计算结果。对应原 CalcNotionalByMode 返回的三元组,用自描述名。
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/// </summary>
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public readonly struct NotionalResult
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{
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/// <summary>本次平仓部分的计息本金。</summary>
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public decimal ClosePrincipal { get; }
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/// <summary>存续持仓部分的计息本金(全额,不缩放)。</summary>
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public decimal PosiPrincipal { get; }
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/// <summary>有效平仓比例。固定值腿恒为 1(计息基数不随比例变);其余沿用入参。</summary>
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public decimal ClosePercent { get; }
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public NotionalResult(decimal closePrincipal, decimal posiPrincipal, decimal closePercent)
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=> (ClosePrincipal, PosiPrincipal, ClosePercent) = (closePrincipal, posiPrincipal, closePercent);
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public void Deconstruct(out decimal close, out decimal posi, out decimal pct)
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=> (close, posi, pct) = (ClosePrincipal, PosiPrincipal, ClosePercent);
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}
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/// <summary>
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/// 利息腿计息基数策略。每个 InterestMode 一个实现,替换原 CalcNotionalByMode 的 switch。
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///
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/// 职责单一:给定持仓参数与平仓比例,算出"平仓本金 / 存续本金 / 有效比例"。
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/// 不做计息(计息由 SwapInterest 纯函数完成),不取价(取价由 IIndexFixer 完成)。
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/// </summary>
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public interface IInterestLegStrategy
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{
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/// <summary>该策略对应的计息模式。</summary>
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InterestModeEnum Mode { get; }
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/// <summary>
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/// 根据持仓参数与平仓比例计算计息本金三元组。
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/// </summary>
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/// <param name="fix">合约固定本金(固定值/预付金腿用;其余腿忽略)。</param>
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/// <param name="posiNotional">当前剩余名义本金(数量 × 全价)。</param>
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/// <param name="posiLong">多头剩余名义本金(多空存续腿用,当前界面已禁用)。</param>
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/// <param name="posiShort">空头剩余名义本金。</param>
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/// <param name="closePercent">平仓比例(占剩余,0~1)。</param>
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NotionalResult CalcNotional(decimal fix, decimal posiNotional, decimal posiLong, decimal posiShort, decimal closePercent);
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}
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using YLErp.DBModels;
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namespace YLErp.Modules.SwapModule.InterestLegs;
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/// <summary>
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/// 标的期初全价利息腿(InterestMode=标的期初全价)。
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/// 站在"持仓全价"视角:计息基数 = 标的含费全价(PosiGrossPrice/EntryDirtyPrice) × 数量。
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/// 主路径 CalcNotionalByMode 公式与合约名义本金规模(2)相同;
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/// 差异在衡泰路径会乘 grossPrice 折算(SwapDealService.GetUnwindInterestsByHT),
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/// 以及 EOD 复利部分平仓后直接返回剩余本金(禁止反推,SwapEodPositionService:1458-1465)。
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/// </summary>
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public sealed class UnderlyingFullPriceLeg : IInterestLegStrategy
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{
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public InterestModeEnum Mode => InterestModeEnum.标的期初全价;
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public NotionalResult CalcNotional(decimal fix, decimal posiNotional, decimal posiLong, decimal posiShort, decimal closePercent)
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=> new(posiNotional * closePercent, posiNotional, closePercent);
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}
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