8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

1/15

State diagrams Interaction diagrams

Sequence diagrams

Collaboration diagrams

Object orientation

Part 4:Dynamic Modeling

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

2/15

Stimulate 2005

Instructor: Luz M. Quiroga

lquiroga@hawaii.edu

University of Hawaii

Information and Computer Science / Library

and information Science

POST 314b; 808-956-9988

System Analysis and Design (SA&D)

Object Oriented modeling

Part 4: Dynamic modeling: state and interaction diagrams

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

3/15

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

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

4/15

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 (bulls eye: solid, filledcircle 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, gettingmarried, being hired, etc.

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

5/15

State diagram for the student object

States, transitions, events

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

6/15

Sequence diagrams Depicts interaction among objects during a certainperiod 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

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

7/15

Sequence diagram for a class

registration scenario with prerequisites

Objects, lineline, activation, messages

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

8/15

Dynamic Modeling:

State Diagrams State

A condition during the life of an object during whichit 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.8A.8

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

9/15

A.9A.9

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

10/15

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

10.1010.10

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

11/15

Dynamic Modeling:

Sequence Diagrams Synchronous Message

A type of message in which the caller has to

wait for the receiving object to finish executingthe called operation before it can resumeexecution itself

Simple Message

A message that transfers control from thesender to the recipient without describing thedetails of the communication

10.1110.11

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

12/15

10.1210.12

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

13/15

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

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

14/15

OO scope

Source: Sinha

OO Is not LIMITED to Information System

8/9/2019 Luz Quiroga Stim5 Part4 State Sequence Diagrams

15/15

Source: Martin