Model evolving

聚合根

TransferService

LimitedATMAccount

+ withdraw(double amount)+ calculateInterest( )+ setLimit(double limit)

Account

CustomerInfo

演变一

Amount must be an integer

CashTransaction

Transaction

+ fromAccount+ toAccounts- amount

+ execute()

IWithdrawable

+ withdraw(double amount)

+ calculateInterest( )

After

ATMAccount

+ withdraw(double amount)+ calculateInterest( )

Apple PayTransaction

+ apply(Transaction)

To Account must support Apple Pay

BitCoinTransaction

Address

Before

Constraints：

Amount must be greater than 0

演变二

Journal

ILimitedWithdrawable

+ setLimit(double limit)

Model Evolving

OnlineAccount