领域建模补充

问题：

1.  联系有方向性
2.  属性有类型
3.  领域模型尽量避免出现界面相关的东西

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习题

问题

考察点

系统操作规约

示例

A)

Operation: MakeSale()

Cross References: UC：Purchase

Preconditions: User has logged in

Postconditions:

An ProductList w was created.

Attributes of w were initialized.

契约CO2	checkEnemyHealth
操作	checkEnemyHealth(enemyId)
交叉引用	无
前置条件	·角色c  (Character类)和敌人e (Enemy类) 已创建 ·characterAttack()或dealDamage(enemyId)操作已完成 ·游戏处于“活动”状态
后置条件	返回敌人e(Enemy)的血量，精度为float

模板 

CO1:

Operation:                

Cross References:          

Preconditions:             

Postconditions:             

原则性问题：

1.  没有SSD的每一个系统操作编写SSC
2.  SOC名字对应系统操作的名字
3.  部分Postcondition 和实际情况有较大差别。

 解析

每个契约均为前面SSD图用户向系统发出的动作

例如

Contract CO1: Login(WorkerId, psw)

Contract CO2: AddItem()

Contract CO3: EnterItemDetails:(Name, PartitionNum, ShelfNum, LayerNum)

Contract CO4: ConfirmAddition()

 Operation:    与Contract CO1相同 

Cross References:   所填内容为SSD图所画的用例名

Preconditions:    前置条件         

Postconditions:    后置条件 

我的答案

• System Operation Contract

CO1: enterBook(BookID)

Operation:                enterBook(BookID)

Cross References:          UC: Borrow Books

Preconditions:             ongoing book borrowing service

Postconditions:            • The book whose BookID equals the parameter named                                         BookID was associated with b.

CO2: borrowBook(BookID)

Operation:                 borrowBook(BookID)

Cross References:           UC: Borrow Books

Preconditions:              ongoing book borrowing service

Postconditions:             • For all Book instances which were associated with b,

                                        BorrowStatus became “borrowed.”

                                       • b.dueDate was initialized.

可参考第二组的图书管理系统做法，该小组做法更严谨