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Software System Engineering

Activity Diagrams

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Lesson Objectives

Objectives

3

Discuss and understand activity diagrams

Understand the elements of activity diagrams Activity Transition Synch. Bar Decision Diamond Start & Stop Markers

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Activity Diagram

Describes how activities are coordinated.

Is particularly useful when you know that anoperation has to achieve a number of di erentthings, and you want to model what the essentialdependencies between them are, before youdecide in what order to do them.

Records the dependencies between activities,such as which things can happen in parallel and

what must be nished before something else canstart.

Represents the work!ow of the process. 4

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Notation

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Activity1()c Activity2()

1. Activities

2. Transition

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Notation - 2

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Activity1()c

[x>0]

[x=0]

[x0]

[x=0]

[x

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Notation - 3

7

4.1 Synch. Bar !oin" 4.# S$%itting Bar &or'"

(A)D*(+,*

(-+,*

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Notation - 3

8. Start / Sto$ ar'ers

Start ar'er Sto$ ar'er

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Notation - 4

9A$$%ication De$artment 2ro $ ,o%e Bo ndaries

Deve o!ers Testers "ar#ers

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"ctivity Diagrams #$%

To model the dynamic aspects of asystem

It is essentially a owchart Showing ow of control from activity to

activity

!rpose "odel #!siness wor$ ows

"odel operations 11

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'ransitions #$%

'hen the action or activity of a statecompletes( ow of control passes

immediately to the ne)t action oractivity state

A ow of control has to start and endsomeplace initial state -- a solid #all stop state -- a solid #all inside a circle

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'ransitions #&%

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"ctivity Diagram( E)ample #$%

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*ranching #$%

A #ranch speci*es alternate paths

ta$en #ased on some +oolean

e)pression

A #ranch may have one incoming

transition and two or moreo!tgoing ones

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*ranching #&%

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"ctivity Diagram( E)ample #&%

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+orking and oining

,se a synchroni ation #ar to

specify the for$ing and &oining of

parallel ows of control

A synchroni ation #ar is rendered

as a thic$ hori ontal or verticalline

2'

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+ork

A for$ may have one incomingtransitions and two or more o!tgoing

transitions each transition represents an independent

ow of control

concept!ally( the activities of each of

o!tgoing transitions are conc!rrent either tr!ly conc!rrent .m!ltiple nodes/

or se0!ential yet interleaved .one node/ 21

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oin

A &oin may have two or more incomingtransitions and one o!tgoing transition a#ove the &oin( the activities associated with

each of these paths contin!es in parallel

at the &oin( the conc!rrent ows synchroni e each waits !ntil all incoming ows have

reached the &oin( at which point one ow ofcontrol contin!es on #elow the &oin

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+ork

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"ctivity Diagram( E)ample #-%

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"ctivity Diagram( E)ample# %

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"ctivity Diagram( E)ample#/%

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"ctivity Diagram( E)ample #0%

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Swimlanes #$%

A swimlane speci*es a loc!s ofactivities

To partition the activity states on anactivity diagram into gro!ps each gro!p representing the #!siness

organi ation responsi#le for those activities

each gro!p is called a swimlane 1ach swimlane is divided from its

neigh#or #y a vertical solid line 29

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Swimlanes #&%

1ach swimlane has a name !ni0!e withinits diagram

1ach swimlane may represent some real-world entity

1ach swimlane may #e implemented #yone or more classes

1very activity #elongs to e)actly oneswimlane( #!t transitions may cross lanes

3'

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"ctivity Diagram( E)ample #2%

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