08 - Behavioral Modeling

7/30/2019 08 - Behavioral Modeling

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Slide 1

Behavioral Modeling

Chapter 8



Slide 2

Key Ideas

Behavioral models describe theinternal dynamic aspects of aninformation system that supportsbusiness processes in anorganization

Key UML behavioral models are:sequence diagrams, communicationdiagrams, and behavioral statemachine diagrams



Slide 3

Objectives

■ Rules and style guidelines for sequenceand communication diagrams andbehavioral state machines.

■ Processes used to create sequence andcommunication diagrams and behavioralstate machines.

■ Relationship between the behavioralmodels and the structural and functionalmodels.



Slide 4

BEHAVIORAL MODELS



Slide 5

Purpose of BehavioralModels

Show how objects collaborate tosupport each use case in the

structural modelDepict the internal view of thebusiness process

To show the effects of variedprocesses on the system



Slide 6

Interaction DiagramComponents

ObjectsInstantiation of a class

Has attributes that describe anobject

Operations

Send and receive messagesMessages

Tell object to execute a behavior



Interaction Diagrams

Two types:

Sequence Diagrams

Communication Diagrams

Slide 7



Slide 8

Sequence Diagrams

Dynamic model

Illustrate the objects that

participate in a use-caseShow the sequence of messages that pass between

objects for a particular use-caseover time



Sequence Diagram Syntax

Slide 9



Slide 10

Example Sequence Diagram



Slide 11

Building a SequenceDiagram

1. Determine the context of thesequence diagram

2. Identify the participating objects3. Set the lifeline for each object

4. Add messages

5. Add execution occurrence on eachobject’s lifeline

6. Validate the sequence diagram



Slide 12

Normal Flow of Events:

1. Customer submits a search request to the system.2. The system provides the customer a list of recommended CDs.

3. The customer chooses one of the CDs to find additionalinformation.

4. The system provides the customer with basic information & CD Reviews

5. The customer calls the maintain order use case.6. The customer iterates over 3 through 5 until finished shopping.

7. The customer executes the checkout use case.8. The customer leaves the website.



Slide 13



Slide 14

Communication Diagrams

Essentially an object diagram thatshows message passingrelationships instead of aggregation or generalizationassociations.

Emphasize the flow of messagesamong objects, rather than timingand ordering of messages



Slide 15

Communication Diagram Syntax

Actor

Object

Association

Message

Frame



Communication Diagram Syntax

Slide 16



Slide 17

Example Communication Diagram



Slide 18

Steps for buildingCommunication Diagrams

1. Set the context.

2. Identify which objects (actors) and

the associations between the objectsparticipate in the collaboration.

3. Layout the communication diagram.

4. Add messages.5. Validate the communication

diagram.





Slide 20



Slide 21

Behavioral State Machines

The behavioral state machine isa dynamic model that shows

the different states of theobject and what events causethe object to change from one

state to another, along withits responses and actions.



Slide 22

Elements of a BehavioralState Machine

States

Events

TransitionsActions

Activities



Behavioral State Machinediagram syntax

Slide 23



Slide 24

Behavioral State MachineDiagram Syntax

A STATE

AN INITIAL STATE

A FINAL STATE

AN EVENT

A TRANSITION

A Frame



Slide 25

Example Behavioral StateMachine Diagram



Slide 26

Building Behavioral StateMachine Diagrams

Set the context

Identify the initial final, and stable statesof the object

Determine the order in which the objectwill pass through stable states

Identify the events, actions, and guard

conditions associated with the transitionsValidate the statechart diagram



Slide 27



Slide 28

Your Turn

What distinguishes the sequencediagram, the collaboration diagram,and the behavioral state machinediagram?

For what sort of new applicationsmight you need to develop all of

these? Are there any new applicationsthat would not need all of thesediagrams for full development?



Slide 29

Summary

Sequence diagrams illustrate the classes thatparticipate in a use case and the messages thatpass between them.

Communication diagrams provide a dynamicview of the object-oriented system andaccentuate message passing betweencollaborating actors and objects.

Behavioral State Machine diagrams show thedifferent states that a single class passesthrough in response to events.



Slide 30

Expanding the Domain

Each year the Association forComputing Machinery (ACM)

sponsors a conference on objectoriented programming. Fordetails about future conferences

and other ACM programs check:http://oopsla.acm.org

http://www.acm.org

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08 - Behavioral Modeling