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Software System Engineering

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Presentation on theme: "Software System Engineering"— Presentation transcript:

1 Software System Engineering
7/16/2019 Software System Engineering Dr. M.E. Fayad, Professor Computer Engineering Department, Room #283I College of Engineering San José State University One Washington Square San José, CA © M.E. Fayad SJSU -- CmpE

2 Lesson 3-6b: Sequence Diagrams
7/16/2019 Lesson 3-6b: Sequence Diagrams 2 © M.E. Fayad SJSU – CmpE M.E. Fayad

3 3 Lesson Objectives Understand how to generate sequence diagrams
7/16/2019 Lesson Objectives Understand how to generate sequence diagrams Learn the syntax of sequence diagram Explore examples of sequence diagrams 3 © M.E. Fayad SJSU – CmpE M.E. Fayad

4 Drawing Sequence Diagrams
7/16/2019 Drawing Sequence Diagrams Place objects that participate in the interaction at the top of the diagram, across the X-axis Place the object that initiates the interaction at the left, and increasingly more subordinate objects to the right Place messages the objects send and receive along the Y-axis, in order of increasing time from top to bottom 4 © M.E. Fayad SJSU – CmpE M.E. Fayad

5 7/16/2019 Common Uses Use sequence diagrams to model flows of control by time ordering Do a better job of visualizing simple iteration and branching Use collaboration diagrams to model flows of control by organization Do a better job of visualizing complex iteration and branching and of visualizing multiple concurrent flows of control 5 © M.E. Fayad SJSU – CmpE M.E. Fayad

6 6 Sequence Diagrams Sequence diagrams have two features:
7/16/2019 Sequence Diagrams Sequence diagrams have two features: Object lifeline Vertical dashed line that represents the existence of an object over a period of time Focus of control A tall, thin rectangle that shows the period of time during which an object is performing an action, either directly or through a subordinate procedure 6 © M.E. Fayad SJSU – CmpE M.E. Fayad

7 Syntax of Sequence Diagram
7/16/2019 Syntax of Sequence Diagram 7 © M.E. Fayad SJSU – CmpE M.E. Fayad

8 Sequence Diagram: Example (1)
7/16/2019 Sequence Diagram: Example (1) 8 © M.E. Fayad SJSU – CmpE M.E. Fayad

9 Sequence Diagram: Example (2)
7/16/2019 Sequence Diagram: Example (2) 9 © M.E. Fayad SJSU – CmpE M.E. Fayad

10 Sequence Diagram: Example (3)
7/16/2019 Sequence Diagram: Example (3) 10 © M.E. Fayad SJSU – CmpE M.E. Fayad

11 Sequence Diagram: Example (4)
7/16/2019 Sequence Diagram: Example (4) 11 © M.E. Fayad SJSU – CmpE M.E. Fayad

12 Sequence Diagram: Example (5)
7/16/2019 Sequence Diagram: Example (5) 12 © M.E. Fayad SJSU – CmpE M.E. Fayad

13 13 Discussion Questions T/F:
7/16/2019 Discussion Questions T/F: The participants in the sequence diagrams are classes and components The sequences in the sequence diagram are connected. Sequence diagram is an event-trace diagram You can generate a sequence diagram / use case. A sequence diagram models flows of control by time ordering 13 © M.E. Fayad SJSU – CmpE M.E. Fayad

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