5.3 系统顺序图

标签：external   one   and   交互   sys   int   show   The   tin   

系统顺序图 System Sequence Diagram

　　? 把待建系统看成一个黑盒子，研究参与者与系统边界的交互
　　? SSD

　　　　? System Sequence Diagram

　　? What is SSD

　　　　? A SSD is a picture that shows, for one particular scenario of a use case, the events that external actors generate, inter-system events , and their order

　　　　? All systems are treated as a black box

　　　　? the emphasis of the diagram is events that cross the system boundary from actors to systems

　　? System Event

　　　　? external input events

　　　　　　? actor generates events to a system

　　? system operation

　　　　? to handle the system event , for example

　　　　　　? when a cashier enters an item‘s ID, the cashier is requesting the POS system to record that item‘s sale (the enterItem event). That event initiates an operation upon the system

5.3 系统顺序图

标签：external   one   and   交互   sys   int   show   The   tin   

原文地址：https://www.cnblogs.com/mayZhou/p/10548295.html