5.3 系统顺序图
Posted mayzhou
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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
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