Applying Domain-Driven Design to Refactor a Foreign Exchange System

So We Thought We Knew Money Ying Hu Sam Peng [email_address] [email_address] Custom House Global Foreign Exchange

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object]

In our system… ,[object Object],public class Contract { decimal tradingRate; bool isRateDirect; string tradeCurrency; decimal tradeAmount; string settlementCurrency; decimal settlementAmount; decimal Markup; … … decimal GetRate( string unitCurrency, string referenceCurrency); ,[object Object]

Implicit Domain Concept ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Distilling the Domain ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Value Objects - Rate ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Class Rate { Currency unitCurrency; Currency settlementCurrency; decimal value; public Money Convert (Money money); } Class Contract { Money settlementMoney = tradingRate.Convert (tradeMoney); }

Value Objects - Markup ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Class Markup public Rate AppliedTo (Rate rate); Class Contract Rate newRate = markup.AppliedTo (oldRate);

Value Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Currency gbp = CurrencyList.Get(“GBP”);

Refactoring ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Compromises… ,[object Object],public class Order { private decimal settlementAmount; private string settlementCurrency; public string SettlementCurrency { get { return settlementCurrency; } } public decimal SettlementAmount { get { return settlementAmount;} } } public class Order { private decimal settlementAmount; private string settlementCurrency; public Money SettlementMoney { get{ return new Money(settlementCurrency,settlementAmount); } } }

… And Pitfalls ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],X

Today and Beyond ,[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object]

Thank you for your attention ,[object Object],[object Object]

Applying Domain-Driven Design to Refactor a Foreign Exchange System

Recommended

Recommended

More Related Content

Similar to Applying Domain-Driven Design to Refactor a Foreign Exchange System

Similar to Applying Domain-Driven Design to Refactor a Foreign Exchange System (20)

Recently uploaded

Recently uploaded (20)

Applying Domain-Driven Design to Refactor a Foreign Exchange System