State diagrams Interaction diagrams Sequence diagrams Collaboration diagrams

1. Object orientationPart 4: Dynamic Modeling • State diagrams • Interaction diagrams • Sequence diagrams • Collaboration diagrams

2. Stimulate 2005 System Analysis and Design (SA&D) Object Oriented modeling Part 4: Dynamic modeling: state and interaction diagrams Instructor: Luz M. Quiroga lquiroga@hawaii.edu University of Hawaii Information and Computer Science / Library and information Science POST 314b; 808-956-9988

3. State diagrams • STATE: a condition during the life of an object during which it • Satisfies some conditions • Performs some actions • Waits for some events • State transitions

4. State diagrams • State: rectangle with round corners • Event: something that takes at a certain point of time. • It triggers a state transition • It spans a period of time • Initial (solid, filled circle) and final state (bull’s eye: solid, filled circle surrounded by another circle ) • Transition depicted as solid arrow from source state to target state • Transition: labeled with name of the event, parameters of the event, [guard condition] and “/”action expression • Examples: registering to a class, dropping from a class, getting married, being hired, etc.

5. State diagram for the student object • States, transitions, events

6. Sequence diagrams • Depicts interaction among objects during a certain period of time • One diagram for each use case: e.g Class registration • Scenarios • Messages: e.g checkIfopen • Synchronous: needs answer • Simple: transfering the control • Messages have arguments • Persistent objects • Activation: time period during which the object performs an operation

7. Sequence diagram for a class registration scenario with prerequisites • Objects, lineline, activation, messages

8. Dynamic Modeling:State Diagrams • State • A condition during the life of an object during which it satisfies some conditions, performs some actions or waits for some events • Shown as a rectangle with rounded corners • State Transition • The changes in the attribute of an object or in the links an object has with other objects • Shown as a solid arrow • Diagrammed with a guard condition and action • Event • Something that takes place at a certain point in time A.8

9. A.9

10. Dynamic Modeling:Sequence Diagrams • Sequence Diagram • A depiction of the interaction among objects during certain periods of time • Activation • The time period during which an object performs an operation • Messages • Means by which objects communicate with each other 10.10

11. Dynamic Modeling:Sequence Diagrams • Synchronous Message • A type of message in which the caller has to wait for the receiving object to finish executing the called operation before it can resume execution itself • Simple Message • A message that transfers control from the sender to the recipient without describing the details of the communication 10.11

12. 10.12

13. OO paradigm: • Key terms • Unified Modeling Language (UML) • Associations, relationships • Concepts • Object • Object class • Use case • Class diagram • Event • Operation • Sequence diagram • State • State transition

14. OO scope OO Is not LIMITED to Information System Source: Sinha

15. Source: Martin