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Time Sequence Diagram. Dr. Zhen Jiang West Chester University E-mail: zjiang@wcupa.edu url: www.cs.wcupa.edu/~zjiang. Sequence Diagrams. A sequence diagram is an interaction diagram that focuses on the time ordering of messages

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time sequence diagram

Time Sequence Diagram

Dr. Zhen Jiang

West Chester University

E-mail: zjiang@wcupa.edu

url: www.cs.wcupa.edu/~zjiang

slide2

Sequence Diagrams

  • A sequence diagram is an interaction diagram that focuses on the time ordering of messages
  • A vertical dashed line is used to represent the lifetime of an object (it’s the object’s lifeline)
  • A focus of control is a tall, thin rectangle that shows the period of time during which an object is performing an action
  • Details can be found at http://www.ibm.com/developerworks/rational/library/3101.html
slide3

: Pilot

: ATC

: Radar

requestLdgClearance(r)

checkWeather

checkRunwayClear(r)

clear

clearance

tips for time sequence diagram
Tips for Time Sequence Diagram
  • The lifetime of an object is expressed by a rectangle box. It must show when the object starts and when it ends. For different objects with the same class, separated boxes are needed.
  • The time sequence (which action is conducted first) depends on the execution of objects, NOT user.
  • “…” will be used in only two places.
  • No lifetime box for user.
  • All interface classes must be in interface level.
  • Any display results using interface objects must be seen in time sequence diagram.
  • Interface must be organized.
samples
Samples
  • Grading system
  • Shopping system
  • Ticket/Box system