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13-puttingitalltogether

13-puttingitalltogether - Putting It All Together Kenneth M...

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Putting It All Together Kenneth M. Anderson University of Colorado, Boulder CSCI 4448/5448 — Lecture 13 — 10/06/2009 © University of Colorado, 2009 1
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Lecture Goals • Introduce two new UML diagrams • Review material from Chapter 10 of the OO A&D textbook • The OO A&D project life cycle • Compare to other OO A&D life cycles • The Objectville Subway Map Example (in python) • Dijkstra’s Algorithm • Discuss the example application of Chapter 10 • Emphasize the OO concepts and techniques encountered in Chapter 10 2
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Two New UML Diagrams • Activity Diagrams and State Diagrams • Relationship to life cycles • They represent alternate ways to record/capture design information about your system. They can help you identify new classes and methods that • They are typically used in the following places in analysis and design • After use case creation: create an activity diagram for the use case • For each activity in the diagram: draw a sequence diagram • Add a class for each object in the sequence diagrams to your class diagram, add methods in sequence diagrams to relevant classes • Based on this information, see if you can partition an object’s behavior into various categories (initializing, acquiring info, performing calcs, …) • Create a state diagram for the object that documents these states and the transitions between them (transitions typically map to method calls) 3
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Activity Diagrams • Think “Flow Chart on Steroids” • Able to model complex, parallel processes with multiple ending conditions • Constructs • Initial Node (circle)/Final Node (circle in circle)/Early Termination Node (circle with x through it) • Activity: Rounded Rectangle indication an action of some sort either by a system or by a user • Flow: directed lines between activities and/or other constructs. Flows can be annotated with guards “[student on list]” that restrict its use • Fork/Join: Black bars that indicate activities that happen in parallel • Decision/Merge: Diamonds used to indicate conditional logic. • Swim Lanes: A way to layout the diagram to associate roles with activities 4
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Example Activity Diagram Example adapted from <http://www.agilemodeling.com/artifacts/activityDiagram.htm >. Copyright © 2003-2006 Scott W. Ambler Fill Out Forms Inspect Forms [problem found] Display Enrollment Screen [no problem found] Enter Applicant Information Validate Student Search for Student Record Need to Apply [not a student] Display Matches Create Student Record [matches found] [no matches] [on list] [not on list] [is a student] Enroll Student Calculate Fees Process Payment 5
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State Diagrams • Shows the major states of an object or system • Each state appears as a rounded rectangle • Arrows indicate state transitions • Each transition has a name that indicates what triggers the transition (often times, this name corresponds to a method name) • Each transition may optionally have a guard that indicates a condition that must be true before the transition can be followed
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