© 2010 Bennett, McRobb and Farmer 1

Object Interaction – Interaction Overview Diagrams

Timing DiagramsBased on Chapter 09

Bennett, McRobb and Farmer

Object Oriented Systems Analysis and Design Using UML

4th Edition, McGraw Hill, 2010

© Bennett, McRobb and Farmer 2005 2

In This Lecture You Will Learn:

• how to model interactions using interaction overview diagrams;

• how to model interaction using an interaction sequence diagram;

• how to use timing diagrams.

© Bennett, McRobb and Farmer 2005 3

Interaction Overview Diagrams

• Variants of activity diagrams (see Ch 5)• Focuses on the flow of control in an interaction• Nodes in the diagram may be interactions or

interaction occurrences• Interaction needs to be broken down into its key

elements.

© Bennett, McRobb and Farmer 2005 4

Interaction Overview Diagrams

• An alternative version of the sequence diagram Add a new advert to a campaign if within budget is shown on the next slide and is used to develop an interaction overview diagram

© Bennett, McRobb and Farmer 20055

:Client :Campaign :Advert

getName

listCampaigns ref

:CampaignManager

alt

[else]

sd Add a new advert to a campaign if within budget

List client campaigns

[totalCost <= budget]

refCreate advert

Create requestref

ref

Get campaign budget

addCostedAdvert

© Bennett, McRobb and Farmer 2005 6

Interaction Fragment Used

:Campaign :Advert

getCost

sd Get campaign budget

loop

getOverheads

checkCampaignBudget

:CampaignManager

[For all campaign’s adverts]

© Bennett, McRobb and Farmer 2005 7

Interaction Fragment Used

:Campaign :Advert

Advert newAd:Advert

sd Create advert

© Bennett, McRobb and Farmer 2005 8

Interaction Fragment Used

:Campaign :Advert

newRequest:Request Request

sd Create request

© Bennett, McRobb and Farmer 2005

9

refGet campaign budget

[totalCost <= budget]

refCreate advert Create request

ref

:Campaign:CampaignManage

r addCostedAdvert

sd Add costed advert

[totalCost > budget]

sd Add a new advert to a campaign if within budget

:Client :CampaigngetName

listCampaigns

getCampaignDetails

:CampaignManage

r

sd List Campaigns for Client

loop [For all client’s campaigns]

Decision

Interaction occurrence In-line sequence diagram

Initial node

Final node

© Bennett, McRobb and Farmer 2005 10

Timing Diagrams

• A new feature in UML 2.0

• Show how time constraints affect interactions between lifelines

• The sequence diagram Car enters car park is the basis for the subsequent timing diagram

© Bennett, McRobb and Farmer 2005 11

Timing Diagrams

:TicketMachine :Barrier after:WeightSensor

sd Car enters car park

raiseBarrier

lowerBarrier

before:WeightSensor

activate

Raised

Lowered

LoweredActive

deactivate

Blocked

barrierLowered

Inactive

ticketRequested

© Bennett, McRobb and Farmer 2005 12

Timing Diagrams

sd Car enters car park lifelines :Barrier, :TicketMachine

:Ba

rrie

r:T

ick

etM

ac

hin

e

Lowered

Raised

Inactive

Active

Blocked

t

{t..t+3s}Timing Constraint

raiseBarrier

barrierLowered

Diagram has two instances, one for each lifeline

Sloped line represents duration of state change

Message from one lifeline to another

© Bennett, McRobb and Farmer 2005 13

Model Consistency

• Timing diagrams must be consistent with the relevant sequence diagrams and state machines.

© Bennett, McRobb and Farmer 2005 14

Summary

In this lecture you have learned about:

• how to model interactions using interaction overview diagrams;

• how to model interaction using an interaction sequence diagram;

• how to use timing diagrams.

© Bennett, McRobb and Farmer 2005 15

References

• UML Reference Manual (OMG, 2009)

• Bennett, Skelton and Lunn (2005)

(For full bibliographic details, see Bennett, McRobb and Farmer)