●●●●● ●●●● Records-sale-of ●●●●● ●●●● Described-b ●●0● Product Product Specificati pnce itemID Used-b Describ Sales Lineltem Store tem name 1 Contained-In Logs- completed 1 Houses Sale Started-by Manager time Paid-b itiated-by 4 Records-sales-on Payment Customer Ca ashier
领域模型
●●● ●●●●● ●●●● 如何实现 make Newsale ●●●●● ●●●● ●●0● ●契约(后置条件) ●创建了Sae的实例s ●s被关联到 Register s的属性被初始化 选择控制器 类型1还是类型2?
如何实现makeNewSale ⚫ 契约（后置条件） ⚫ 创建了Sale的实例s ⚫ s被关联到Register ⚫ s的属性被初始化 ⚫ 选择控制器 ⚫ 类型1还是类型2？
●●● ●●●●● ●●●● 如何实现 make Newsale ●●●● ●●●● ●●0● by creator and Controller Register creates a Sale by creator by Creator, sale Registe reates an empt collection(such as a List) which wil‖l eventually hold Saleslineltem makeNewSale instances create create lineltems List<saleslineltem> this execution specification is implie within the constructor of the sale instance
如何实现makeNewSale :Register makeNewSale :Sale create Register creates a Sale by Creator create lineItems : List<SalesLineItem> by Creator, Sale creates an empty collection (such as a List) which will eventually hold SalesLineItem instances by Creator and Controller this execution specification is implied to be within the constructor of the Sale instance
●●●●● ●●●● 如何实现 enterltem ●●●●● ●●●● ●●0● the name could be "NextGenPOS"but"System"keeps it the":and underline imply an instance, and are explained in a ater chapter on sequence diagram notation in the UML Process sale Scenario Cashier makeNewsale a UML loop oop丿 more items interaction enterltem (itemID, quantity) a expression description, total end sale ssociated with the it is an abstraction previous message representing the an abstraction that ystem event of make Payment(amount). not returned
如何实现enterItem enterItem(itemID, quantity) : Cashier :System endSale makePayment(amount) a UML loop interaction frame, with a boolean guard expression external actor to system Process Sale Scenario system as black box the name could be "NextGenPOS" but "System" keeps it simple the ":" and underline imply an instance, and are explained in a later chapter on sequence diagram notation in the UML a message with parameters it is an abstraction representing the system event of entering the payment data by some mechanism description, total return value(s) associated with the previous message an abstraction that ignores presentation and medium the return line is optional if nothing is returned total with taxes change due, receipt makeNewSale loop [ more items ]