IFS 410 Advanced Analysis and Design Week 14

IFS 410: Advanced Analysis and Design Week 14: Activity Diagram & Interaction Diagrams 10/22/2021

UML Techniques for OO Design Activity Diagram Communication (Collaboration) Diagram Sequence Diagram Package, Component, Deployment Diagrams 10/22/2021 2

Activity Diagrams • Shows the conditional logic for the sequence of system activities needed to accomplish a business process • Clearly shows parallel and alternative behaviors • Can be used to show the logic of a use case 10/22/2021 3

Activity Diagram n n Focus on system behavior Model an object’s workflow during program execution Model the actions the object will perform and in what order UML representation w Action state ( rectangle with its left and right sides replaced by arcs curving outwards) w Action order ( arrow with a stick arrowhead) w Initial state (solid circle) w Final state (solid circle enclosed in an open circle) 10/22/2021 4

Components of Activity Diagram 10/22/2021 5

Fig. 5. 30 | Activity diagram for a Balance. Inquiry object. 10/22/2021 6

Fig. 5. 31 | Activity diagram for a withdrawal transaction. 10/22/2021 7

When to Use Activity Diagrams Activity diagrams are useful when you want to describe a behavior which is parallel, or when you want to show behaviors in several use-cases interact. Use Communication diagrams when you want to show objects collaborate to implement an activity diagram. Use a state (chart) diagram to show one object (attribute) changes during its lifetime. 10/22/2021 8

Interaction Diagrams n n Model interactions use UML Communication diagrams w Also called collaboration diagrams w Emphasize which objects participate in collaborations n Sequence diagrams w Emphasize when messages are sent between objects 10/22/2021 9

A communication diagram Fig. 7. 26 | Communication diagram of the ATM executing a balance inquiry. 10/22/2021 10

Sequence diagrams n n Help model the timing of collaborations Lifeline w Dotted line extending down from an object’s rectangle n n Represents the progression of time Activation w Thin vertical rectangle n 10/22/2021 Indicates that an object is executing 11

A Sequence Diagram Fig. 7. 28 | Sequence diagram that models a Withdrawal executing. 10/22/2021 12

Elements in Sequence Diagrams 10/22/2021 13

Creating a Sequence Diagram 10/22/2021 14