1 CS 691z/791z Topics in Software Engineering Chapter 13: Activity Diagrams & Chapter 19: Basic...

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CS 691z/791zTopics in Software

Engineering

Chapter 13: Activity Diagrams &Chapter 19: Basic Statecharts

[Arlow and Neustadt, 2002]March 8, 2007

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Outline

Activity diagrams: Actions and subactivity states TransitionsDecisions, forks, and joinsSwimlanes and object flowsSignals

Basic statecharts:SyntaxStatesTransitionsEvents

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Activity Diagrams: Actions & Subactivities.

Actitivity diagrams:Actitivity diagrams: A form of “OO flowcharts,” a particular case of A form of “OO flowcharts,” a particular case of

statechartsstatecharts Attached to modeling elements to describe behaviorAttached to modeling elements to describe behavior Typically related to use cases, classes, components, Typically related to use cases, classes, components,

collaborations, operations & methodscollaborations, operations & methods Contain actions (atomic, uninterruptible, Contain actions (atomic, uninterruptible,

instantaneous) and sub-activities (non-atomic, instantaneous) and sub-activities (non-atomic, interruptible, may take time) interruptible, may take time)

Examples of actions, Examples of actions, Fig. 13.2 [Arlow & Neustadt]:Fig. 13.2 [Arlow & Neustadt]:

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Activity Diagrams: .Actions & Subactivities

Actions: Start and stop states, Fig. 13.3 [Arlow & Neustadt, 2002]

Subactivities: Examples, Fig. 13.4 [Arlow & Neustadt, 2002]

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Activity Diagrams: Transitions

Transitions in activitydiagrams, Fig. 13.5 [Arlow &Neustadt, 2002]

Transitions in activity diagrams occur when the states finish their work

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Activity Diagrams: Decisions

Decisions in activitydiagrams, Fig. 13.6[Arlow & Neustadt, 2002]

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Activity Diagrams: Forks and Joins

Fig. 13.7 [Arlow &Neustadt, 2002]

Activity diagramsallow modeling concurrent

workflows

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Activity Diagrams: Swimlanes

Fig. 13.8 [Arlow &Neustadt, 2002]

Swimlanes are typically used for use cases,business

modeling,and workflowmodeling

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Activity Diagrams: Object Flows

Fig. 13.9 [Arlow &Neustadt, 2002]

Activities may input

and output objects

and may modifyobject states

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Activity Diagrams: Signals

Fig. 13.10 [Arlow & Neustadt, 2002]

A signal is a package of information transferred asynchronously between objects

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Statecharts There are two main modeling elements in statecharts:

states and transitions. Example of a simple state machine, Fig. 19.2 [Arlow &

Neustadt]

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Statecharts: Syntax

Summary of UML state syntax, Fig.19.3 [Arlow & Neustadt, 2002]

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Statecharts: Transitions

Summary of UML transition syntax, Fig.19.4 [Arlow & Neustadt, 2002]

Where: Event = internal or external occurrence that triggers the

transition Guard condition = boolean expression, when true transition

allowed Action = some operation that takes place when the transition

fires

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Statecharts: Events….

Events can be of four types:Call eventSignal eventChange eventTime event

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Statecharts: .Events…

Example of a call event, Fig.19.6 [Arlow & Neustadt, 2002]

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Statecharts: ..Events..

Example of signal eventFig.19.7 [Arlow & Neustadt, 2002]

Modeling the receipt a signalFig.19.8 [Arlow & Neustadt, 2002]

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Statecharts: …Events.

Example of a change event, Fig.19.9 [Arlow & Neustadt, 2002]

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Statecharts: ….Events

Example of a time event, Fig.19.10 [Arlow & Neustadt, 2002]

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Statecharts: What next?An advanced statechart [Ch. 20, Fig. 20.4, Arlow & Neustadt,

2002]

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Extra: Analysis classes vs. Design

classesFig.15.2 [Arlow & Neustadt, 2002]Fig.15.2 [Arlow & Neustadt, 2002]