Uml & rup

UML & RUPUML & RUP
Introduction toIntroduction to
UMLUML
Vaquar khanVaquar khan

What is UML?What is UML?
• We need to build models for Software-We need to build models for Software-
intensive systems.intensive systems.
• Just as there exists a common languageJust as there exists a common language
for construction industry, electronics/for construction industry, electronics/
electrical industry; UML is a commonelectrical industry; UML is a common
language for visual modeling in softwarelanguage for visual modeling in software
industry.industry.

• UML is appropriate for modeling systemsUML is appropriate for modeling systems
ranging from enterprise informationranging from enterprise information
systems to distributed web applicationssystems to distributed web applications
and even to hard real time embeddedand even to hard real time embedded
systems.systems.
• UML is process independent(although itUML is process independent(although it
optimally can be used for RUP.)optimally can be used for RUP.)

• The UML is language forThe UML is language for
visualizingvisualizing
specifyingspecifying
constructingconstructing
documentingdocumenting
the artifacts of a software intensive systemthe artifacts of a software intensive system

• VisualizingVisualizing
Explicit model facilitates communication.Explicit model facilitates communication.
Some structures transcend what can beSome structures transcend what can be
represented in programming languagerepresented in programming language
Each symbol has well-defined semanticsEach symbol has well-defined semantics
behind itbehind it

SpecifyingSpecifying
The UML addresses the specification of allThe UML addresses the specification of all
important analysis, design, andimportant analysis, design, and
implementation decisions.implementation decisions.

ConstructingConstructing
Forward engineering: generation of code fromForward engineering: generation of code from
model into programming language.model into programming language.
Reverse engineering: reconstructing model fromReverse engineering: reconstructing model from
implementationimplementation
Round-trip engineering: going both waysRound-trip engineering: going both ways

DocumentingDocumenting
Artifacts include:deliverables, such asArtifacts include:deliverables, such as
requirements documents,functionalrequirements documents,functional
specifications, and test plans.specifications, and test plans.
materials that are critical in controlling, measuring,materials that are critical in controlling, measuring,
and communicating about a system duringand communicating about a system during
development and after deploymentdevelopment and after deployment

Building blocks of UMLBuilding blocks of UML
• ThingsThings(icons/symbols)(icons/symbols)
• RelationshipsRelationships(among the things)(among the things)
• Diagrams(Diagrams(combination of things andcombination of things and
relationships)relationships)
• Extensibility Mechanisms(Extensibility Mechanisms(extendextend
vocabulary of UML)vocabulary of UML)

Diagrams in UMLDiagrams in UML
The following diagrams provide theThe following diagrams provide the staticstatic
viewview of the system.of the system.
Class DiagramClass Diagram
Object DiagramObject Diagram
Component DiagramComponent Diagram
Deployment DiagramDeployment Diagram

The following diagrams provide theThe following diagrams provide the dynamicdynamic
viewview of the system.of the system.
Use case DiagramUse case Diagram
Sequence DiagramSequence Diagram
Collaboration DiagramCollaboration Diagram
Statechart DiagramStatechart Diagram
Activity DiagramActivity Diagram

• Class Diagrams represent the static structure inClass Diagrams represent the static structure in
terms of classes and relationships.terms of classes and relationships.
• Object Diagrams represent object and theirObject Diagrams represent object and their
relationships.relationships.
• Use case Diagrams represent the functions of aUse case Diagrams represent the functions of a
system from the user’s point of view.system from the user’s point of view.
• Sequence Diagrams represent interactionsSequence Diagrams represent interactions
among the objects on time scaleamong the objects on time scale

• Collaboration Diagrams are a spatialCollaboration Diagrams are a spatial
representation of objects, links and interactionsrepresentation of objects, links and interactions
• Statechart Diagrams represent the behavior ofStatechart Diagrams represent the behavior of
an object in terms of its state changes.an object in terms of its state changes.
• Activity Diagrams represent the behavior of anActivity Diagrams represent the behavior of an
operation as a set of actionsoperation as a set of actions

• Component Diagrams represent theComponent Diagrams represent the
physical components of the application.physical components of the application.
• Deployment Diagrams represent theDeployment Diagrams represent the
deployment of the components ondeployment of the components on
particular pieces of hardware.particular pieces of hardware.

• A class is represented by a rectangle in UMLA class is represented by a rectangle in UML
• Initial uppercase letterInitial uppercase letter
• first letter of second word capitalized.first letter of second word capitalized.
WashingMachine
Icon for class

• Classes can be grouped into aClasses can be grouped into a packagepackage
• UML represents a package as a tabbed folder.UML represents a package as a tabbed folder.
Household Appliances
A UML package

• AA classclass name with thename with the packagepackage name isname is
called acalled a pathname.pathname.
Household Appliances:: WashingMachine

• AnAn attributeattribute is a property of a class.Itis a property of a class.It
describes a range of values that thedescribes a range of values that the
property may hold in objects(i.e.property may hold in objects(i.e.
instances)of that class.instances)of that class.WashingMachine
brandName
modelName
serialNumber
capacity
A class & its attributes

• AnAn operationoperation is something that a class canis something that a class can
do, or that you(or another class)can do todo, or that you(or another class)can do to
a class.a class. WashingMachine
brandName
modelName
serialNumber
capacity
addClothes()
Removeclothes()
addDetergent()
turnOn()

• VisibilityVisibility
WashingMachine
-brandName
-modelName
…
+addClothes()
+removeClothes()
#turnOn()
…
-private
+public
#protected

• ElidingEliding a class and use ofa class and use of ellipsisellipsis
WashingMachine
brandName
...
ellipsis
addClothes()
...

• Use ofUse of stereotypesstereotypes
WashingMachine
<<id info>>
brandName
modelName
serialNumber
<<machine info>>
capacity
<<clothes related>>
addClothes()
stereotypes
(can be used to
organize a list
of attributes or
operations)

• Use ofUse of constraintconstraint andand notesnotes
WashingMachine
brandName
modelName
serialNumber
capacity
addClothes()
removeClothes()
addDetergent()
turnOn()
{capacity=16
or 18 or 20 lb.}
constraint
Ref: Govt.std
EV5-2241 for
serial nos.
note

• InterfaceInterface
An interface specifies the
externally-visible operations of a
class and/or component, and has no
implementation of its own. An
interface typically specifies only a
limited part of the behavior of a
class or component.
notation
interface
iconic

• Interface: expanded form representationInterface: expanded form representation
using stereotype.using stereotype.
<<interface>>
ImageObserver

• How to find classes?How to find classes?
Classes represent the vocabulary of anClasses represent the vocabulary of an
area of knowledge.Conversations with aarea of knowledge.Conversations with a
client or an expert in that area revealsclient or an expert in that area reveals
nouns that can become classes in anouns that can become classes in a
model and verbs that can becomemodel and verbs that can become
operations.operations.

Class RelationshipsClass Relationships
• AssociationAssociation
• MultiplicityMultiplicity
• AggregationAggregation
• CompositionComposition
• DependencyDependency
• InheritanceInheritance

An association between a player and aAn association between a player and a
teamteam
Player Team
Plays on

Serves
{ordered}
CustomerBank Teller
Constraint on
association

• Association classAssociation class
Person Company
Employee
Employer
contract
Role names
Association class

• MultiplicityMultiplicity
Multiplicity denotes the no. of objects ofMultiplicity denotes the no. of objects of
one class that can relate to one object ofone class that can relate to one object of
an associated class.an associated class.
Player Team
Plays on5 1

• CommonCommon multiplicitymultiplicity valuesvalues

• AggregationAggregation
If two classes share associationIf two classes share association
relationship and one class can be said torelationship and one class can be said to
bebe a part of thea part of the otherother, the relationship is, the relationship is
called aggregation.called aggregation.
Aggregation expresses a relationshipAggregation expresses a relationship
between a ‘whole’ and its ‘ part’.between a ‘whole’ and its ‘ part’.

chair
book
menu
classroom
library
window
Aggregation

• CompositionComposition
Composition is a strong type ofComposition is a strong type of
aggregation.Each component in aaggregation.Each component in a
composite can belong to just one whole.composite can belong to just one whole.
The composite is responsible for creationThe composite is responsible for creation
or deletion of itsor deletion of its part.part.
e.g. building and rooms, purchase ordere.g. building and rooms, purchase order
and order line.and order line.

Coffee Table
Table Top Leg
41
1
Composition
Delete the table and the legs and the top have no existence.

When the behavior of one class dependsWhen the behavior of one class depends
on the structure and behavior of anotheron the structure and behavior of another
class, the relationship between them isclass, the relationship between them is
called dependency.called dependency.

If classes A and B do not share any of theIf classes A and B do not share any of the
structural relationships (association,structural relationships (association,
aggregation or composition) and class B isaggregation or composition) and class B is
passed as an argument to a function ofpassed as an argument to a function of
class A, then A is said to depend on B.class A, then A is said to depend on B.

Course Scheduler
add(c:Course)
remove(c:Course)
Course
Window
handleEvent(e:Event)
draw()
Event
Dependency

• InheritanceInheritance
When the classes haveWhen the classes have is a kind ofis a kind of relationshiprelationship
between them it is called inheritance.between them it is called inheritance.
The inheritance is explained byThe inheritance is explained by GeneralizationGeneralization
andand Specialization.Specialization.
The classesThe classes having inheritance relationship arehaving inheritance relationship are
parent and child classes.parent and child classes.

Animal
Amphibian Mammal Reptile
Horse
Inheritance

A typical class diagramA typical class diagram

Use Case DiagramUse Case Diagram
• Use Case AnalysisUse Case Analysis
A software is judged ‘successful’ by its users andA software is judged ‘successful’ by its users and
not by developers.not by developers.
Developers can deliver a successful softwareDevelopers can deliver a successful software
only if they understand user requirements.only if they understand user requirements.
User requirements consists of detailedUser requirements consists of detailed
description of how they want to use the system.description of how they want to use the system.

• What is a use case?What is a use case?
A use case is a description of a system’sA use case is a description of a system’s
behavior from a user’s standpoint.behavior from a user’s standpoint.
It is a collection of scenarios aboutIt is a collection of scenarios about
system’s use.system’s use.
Use case
A use case is shown
as an ellipse

• Example: How to find the use cases for aExample: How to find the use cases for a
washing machine?washing machine?
Ask the question: Why would a userAsk the question: Why would a user
interact with the washing machine?interact with the washing machine?
The answer will describe the functionalityThe answer will describe the functionality
desired by the user. The verbs will givedesired by the user. The verbs will give
us the use cases of the system.us the use cases of the system.

The washing machine as a system will haveThe washing machine as a system will have
following use cases.following use cases.
Wash
clothes
Rinse
clothes
Dry
clothes
User

• ActorActor
An actor is anyone or anything thatAn actor is anyone or anything that
interacts with the system being built.interacts with the system being built.
While use cases describe anything that isWhile use cases describe anything that is
inside the system scope, actors areinside the system scope, actors are
anything that is outside the system scope.anything that is outside the system scope.

• ActorActor
An actor is shown as a stick figure.An actor is shown as a stick figure.
Actor

Use Case
User
Programmer Tester
Architect
Analyst
understands
implements
verifies
expresses
designs

• Scenarios for the use case ‘Wash clothes’Scenarios for the use case ‘Wash clothes’
Open flap Machine starts washingOpen flap Machine starts washing
Add clothes If timer’s time is out,Add clothes If timer’s time is out,
Add soap machine gives alarmAdd soap machine gives alarm
Add waterAdd water
Close flapClose flap
Set modeSet mode
Set TimerSet Timer
This is the normal behavior
of the machine

• The behavior of the machine may change inThe behavior of the machine may change in
exceptional cases.exceptional cases.
e.g. how would machine respond ife.g. how would machine respond if
-user overloads the machine-user overloads the machine
-user forgets to disengage drainage pipe-user forgets to disengage drainage pipe
-in the process of washing there is power-in the process of washing there is power
failurefailure

• When a use case is described there couldWhen a use case is described there could
bebe
many sets of sequences/events which canmany sets of sequences/events which can
be categorized into-be categorized into-
1. Main Flow of events1. Main Flow of events
2. Alternate flow of events2. Alternate flow of events
3. Exceptional flow of events3. Exceptional flow of events

• Primary and Secondary Use casesPrimary and Secondary Use cases
A primary use case is a description of set ofA primary use case is a description of set of
sequence of actions that a system (and actor)sequence of actions that a system (and actor)
perform, that yields an observable result of valueperform, that yields an observable result of value
to a particular actorto a particular actor
e.g Wash clothes is a primary use case becausee.g Wash clothes is a primary use case because
it returns the user, theit returns the user, the washedwashed clothes,clothes, anan
observable result of value to the userobservable result of value to the user

Open flap Machine starts washingOpen flap Machine starts washing
Add clothes If timer’s time is out,Add clothes If timer’s time is out,
Add soap machine gives alarmAdd soap machine gives alarm
Add waterAdd water
Close flapClose flap
Set modeSet mode
Set TimerSet Timer
Load machine
Secondary use case

• Load machine doesn’t return a completeLoad machine doesn’t return a complete
service of value.service of value.
Hence it is a Secondary Use CaseHence it is a Secondary Use Case
The secondary use case can be found byThe secondary use case can be found by
capturing common scenarios in Use Casecapturing common scenarios in Use Case
DescriptionsDescriptions

Use case RelationshipsUse case Relationships
<<include>>:<<include>>:
<<include>> relationship shows a necessary<<include>> relationship shows a necessary
connection between use cases.connection between use cases.
The included use case can be identified in twoThe included use case can be identified in two
ways.ways.
1.1. Included use case might be preexisting and inIncluded use case might be preexisting and in
the development of another use case , thethe development of another use case , the
same behavior is required.same behavior is required.
2.2. To pull the functionality out of the existing useTo pull the functionality out of the existing use
cases to form a new use case.cases to form a new use case.

To use the <<include>> relationship the use casesTo use the <<include>> relationship the use cases
must conform to two constraints.:must conform to two constraints.:
1. The calling use case may only depend on the1. The calling use case may only depend on the
result from the called use case. It can have noresult from the called use case. It can have no
knowledge of the internal structure of the calledknowledge of the internal structure of the called
use case.use case.
2. The calling use case must always require the2. The calling use case must always require the
execution of the called use case. The use of theexecution of the called use case. The use of the
called use case is unconditional.called use case is unconditional.

The included use case can be calledThe included use case can be called
independently by the actor.independently by the actor.

• <<extend>><<extend>>
• It is used to show an optional behavior forIt is used to show an optional behavior for
a use case, which is required only undera use case, which is required only under
certain conditions.certain conditions.
• If two use cases are connected byIf two use cases are connected by extendextend
relationship, one is invoked if somerelationship, one is invoked if some
conditions occurs in another use case.conditions occurs in another use case.

1………………
2………………
3 …[condition]
………………
………………
20 ……………
1…………
2…………
3…………
………….
………….
………….
10……….
False
True
Money
Overdrawn
Withdraw
Money
<<extend>>

• Generalization / Inheritance :Generalization / Inheritance :
• Use case B is said to be inherited from use case A if :Use case B is said to be inherited from use case A if :
• 1.1. B is a specialized use case and A is more general oneB is a specialized use case and A is more general one
• 2.2. The child use case (B) inherits the behavior sequenceThe child use case (B) inherits the behavior sequence
of the parent (A) and may insert additional behavior into itof the parent (A) and may insert additional behavior into it
• 3.3. B can be said to be ‘is a kind of‘ AB can be said to be ‘is a kind of‘ A

• 1.1. Read cardRead card 1.1. Read cardRead card
• 2.2. Get pin numberGet pin number 2.2. GetGet
pin numberpin number
• 3.3. Validate pin number 3.Validate pin number 3. Validate pinValidate pin
numbernumber
• 4.4. Get transaction 4.Get transaction 4. GetGet
transactiontransaction
• 5.5. Get amount 5.Get amount 5. Show balanceShow balance
• 6.6. Dispense money 6.Dispense money 6. Eject cardEject card
• 7 Print report7 Print report
• 8.8. Eject cardEject card
Perform
Transaction
Capturing commonality
Withdraw money Display balance

Enter the appropriate relationshipsEnter the appropriate relationships
for the following use case diagram forfor the following use case diagram for
ATMATM

Use case Analysis : SummaryUse case Analysis : Summary
1.1. Find out possible users / actors for the systemsFind out possible users / actors for the systems
for whom is the system developed? Who are thefor whom is the system developed? Who are the
beneficiaries?beneficiaries?
2.2. Find out what fundamental services (Use Cases) the actors,Find out what fundamental services (Use Cases) the actors,
expect from the systemexpect from the system
-- why would an actor interact with the system ?-- why would an actor interact with the system ?
3.3. Depict the interactions between each actor and the servicesDepict the interactions between each actor and the services
the actor expects from the systemthe actor expects from the system
-- drawing a use case diagram-- drawing a use case diagram
4.4. Detail each use case in terms of scenarios / sequence ofDetail each use case in terms of scenarios / sequence of
actions performed by actors and systemactions performed by actors and system
-- develop use case documentation-- develop use case documentation
5.5. Find out relationships the various use cases may haveFind out relationships the various use cases may have

Use Case realizationUse Case realization
• Finding out key objects withFinding out key objects with
responsibilitiesresponsibilities
• Determining basic object interactionsDetermining basic object interactions
• Finding classes & determining classFinding classes & determining class
relationshipsrelationships

Discovering ObjectsDiscovering Objects
1.1. Underline the nouns that occur in all the relevant useUnderline the nouns that occur in all the relevant use
case scenarios.case scenarios.
2.2. Select the nouns / objects that might share theSelect the nouns / objects that might share the
responsibilities.responsibilities.
3.3. List the basic responsibilities that the objects shouldList the basic responsibilities that the objects should
share.share.
3.3. Match each object with well defined responsibilities.Match each object with well defined responsibilities.
4.4. Investigate if any conceptual objects are requiredInvestigate if any conceptual objects are required
5.5. Work out the (tentative) list of attributes and methodsWork out the (tentative) list of attributes and methods
to be supported by these objects, based on theirto be supported by these objects, based on their
responsibilitiesresponsibilities

Types Of ObjectsTypes Of Objects
Boundary Object Control Object Entity ObjectBoundary Object Control Object Entity Object
Input from
& output to
Environment
localized here
Processing and
flow of control
localized here
Storage of data
localized here

Objects in the systemObjects in the system
Boundary ObjectsBoundary Objects Control ObjectsControl Objects EntityEntity
ObjectsObjects
Card Reader Transaction Manager AccountCard Reader Transaction Manager Account
Display Validator TransactionDisplay Validator Transaction
PrinterPrinter
Boundary
Control
Entity
Packages

Interaction DiagramsInteraction Diagrams
The interaction diagrams are designed to modelThe interaction diagrams are designed to model
how the objects communicate in order tohow the objects communicate in order to
accomplish the tasks within the operation of theaccomplish the tasks within the operation of the
system.system.
The interaction diagram provides a pathwayThe interaction diagram provides a pathway
from the textual descriptions of behaviors in thefrom the textual descriptions of behaviors in the
scenarios to the operations required by thescenarios to the operations required by the
Class Diagram.Class Diagram.

Interaction DiagramsInteraction Diagrams
• Interaction diagrams can be modeled inInteraction diagrams can be modeled in
two ways.two ways.
1. Sequence Diagram: showing time1. Sequence Diagram: showing time
sequence of messages among thesequence of messages among the
objects.objects.
2. Collaboration Diagram: presents a2. Collaboration Diagram: presents a
structure oriented visualization.structure oriented visualization.

A sequence diagram is an interactionA sequence diagram is an interaction
diagram that emphasizes the timediagram that emphasizes the time
ordering of messages.ordering of messages.
A lifeline is a vertical dashed line thatA lifeline is a vertical dashed line that
represents the lifetime of an object.represents the lifetime of an object.
A focus of control is a tall, thin rectangle thatA focus of control is a tall, thin rectangle that
shows the period of time during which anshows the period of time during which an
object is performing an action.object is performing an action.

• A sequence diagram is drawn with respectA sequence diagram is drawn with respect
to a context such as System, Subsystemto a context such as System, Subsystem
or a use case.or a use case.
• Typically a sequence diagram will beTypically a sequence diagram will be
drawn for a use case.drawn for a use case.

Steps for drawing a sequenceSteps for drawing a sequence
diagram.diagram.
1.1. Identify the objects that take part in theIdentify the objects that take part in the
realization of the use case.realization of the use case.
2.2. Place the objects on the diagram fromPlace the objects on the diagram from
left to right.left to right.
3.3. Set the lifelines of the objects.Set the lifelines of the objects.

4.4. Starting with the message that initiatesStarting with the message that initiates
the interaction, layout each subsequentthe interaction, layout each subsequent
messages from top to bottom betweenmessages from top to bottom between
the lifelines.the lifelines.
5.5. Attach theAttach the notesnotes wherever necessary.wherever necessary.

• Types of messages:Types of messages:
Synchronous message:Synchronous message:
AA synchronous messagesynchronous message assumes that aassumes that a
return is needed, so the sender waits forreturn is needed, so the sender waits for
the return before proceeding with anythe return before proceeding with any
other activity.other activity.
A synchronous message is shown as a solidA synchronous message is shown as a solid
arrow with a bold head.arrow with a bold head.

Asynchronous message:Asynchronous message:
The sender just sends out the messageThe sender just sends out the message
and does not wait for a response.and does not wait for a response.
An asynchronous message is shown as aAn asynchronous message is shown as a
solid arrow with a stick head.solid arrow with a stick head.

• Return Message:Return Message:
A message that represent only the replyA message that represent only the reply
to a message is called ato a message is called a return.return.
A return is represented as a dashedA return is represented as a dashed
arrow .arrow .
-------------------

• Self-reference message:Self-reference message:
When the sender and the receiver of theWhen the sender and the receiver of the
message are the same object, it is calledmessage are the same object, it is called
as a self-reference message.as a self-reference message.

A collaboration diagram is an interactionA collaboration diagram is an interaction
diagram that emphasizes the organizationdiagram that emphasizes the organization
of the objects that participate in theof the objects that participate in the
interaction.interaction.
You may have sequence numbers toYou may have sequence numbers to
indicate the time ordering of messages, toindicate the time ordering of messages, to
one or more levels.one or more levels.

Case StudyCase Study
Convert the sequence diagram forConvert the sequence diagram for
GetCoffeeGetCoffee into the collaborationinto the collaboration
diagram.diagram.

State MachinesState Machines
• A state machine is a behavior that specifies theA state machine is a behavior that specifies the
sequences of states an object goes throughsequences of states an object goes through
during its lifetime in response to events, togetherduring its lifetime in response to events, together
with its response to those events.with its response to those events.
• A state machine is used to model the dynamicA state machine is used to model the dynamic
aspects of a system. It is drawn to model theaspects of a system. It is drawn to model the
lifetime of an instance of a class or a use caselifetime of an instance of a class or a use case
or an entire system.or an entire system.

State MachinesState Machines
• A state machine can be visualized in twoA state machine can be visualized in two
ways: by emphasizing the flow of controlways: by emphasizing the flow of control
from activity to activity( by activityfrom activity to activity( by activity
diagrams) or by emphasizing the potentialdiagrams) or by emphasizing the potential
states of the objects and the transitionsstates of the objects and the transitions
among those states (by state chartamong those states (by state chart
diagrams)diagrams)

State chart DiagramState chart Diagram
• It is drawn to show the states of a singleIt is drawn to show the states of a single
object or a subsystem.object or a subsystem.
• It consists of different states of an objectIt consists of different states of an object
triggered by different events and thetriggered by different events and the
signals.signals.
• It is especially useful in modeling reactiveIt is especially useful in modeling reactive
systems.systems.

State chart Diagram
A state is a condition in which an object can
reside during its lifetime while it satisfies
some condition, performs an activity, or waits
for an event.
.

StateState
• The state icon appears as a rectangle withThe state icon appears as a rectangle with
rounded corners and a name. It alsorounded corners and a name. It also
contains a compartment for actions:contains a compartment for actions:
Name
State variables
Activities

Initial and Final States
The initial state is the default starting place
for a state machine.
The final state indicates the completion of the
state machine’s execution.
Filled circle
Bull’s eye

• TransitionTransition
A transition is a relationship between twoA transition is a relationship between two
states indicating that an object in the firststates indicating that an object in the first
state will perform certain actions and enterstate will perform certain actions and enter
the second state when a specified eventthe second state when a specified event
occurs and specified conditions areoccurs and specified conditions are
satisfied.satisfied.

• Parts of a transitionParts of a transition
Idle
Cooling
Temprise[isSetVal]/startComp()
event Guard
condition action
Source state
Target state

• AnAn eventevent is a significant occurrence thatis a significant occurrence that
can trigger a state transition.can trigger a state transition.
UML defines three kinds of events.UML defines three kinds of events.
1.1. Signal eventSignal event caused by acaused by a
signal(exceptions)signal(exceptions)
2.2. Call eventCall event caused by an operationcaused by an operation
3.3. Time eventTime event caused by the expiry of acaused by the expiry of a
timer delay.timer delay.

• AA guard conditionguard condition is a Boolean expressionis a Boolean expression
enclosed in square brackets. It isenclosed in square brackets. It is
evaluated only after the event hasevaluated only after the event has
occurred.occurred.
• AnAn actionaction is an executable atomicis an executable atomic
computation. An action cannot becomputation. An action cannot be
interrupted.interrupted.

• Advanced StateAdvanced State
Using the basic features of the states andUsing the basic features of the states and
transitions in the UML we get thetransitions in the UML we get the FlatFlat
State MachinesState Machines which means a no. ofwhich means a no. of
arcs(transitions) and vertices(states).arcs(transitions) and vertices(states).
To manage the complexity, theTo manage the complexity, the AdvancedAdvanced
StatesStates are used.are used.

Faxing
Date=Current Date
Time=Fax Start Time
Phone No.=Owner Phone No.
Owner=Owner Name
Entry/key in remote fax no.
Exit/complete transmission
Do/ add date stamp
Do/time stamp
Do/add phone no.
Do/add owner
Do/ pull pages through
Do/paginate
Advanced
State

Entry and Exit Actions
An entry action is the first thing that occurs
each time an object enters a particular state.
An exit action is the last thing that occurs
each time an object leaves a particular state.
Tracking
entry/setMode(onTrack)
exit/setMode(offTrack)

Activities
An activity is an interruptible sequence of
actions that an object can perform while it
resides in a given state. (Actions are not
interruptible.)
Tracking
do/followTarget

Sub-states
Idle
Cooling
Heating
Activating
Active
Superstate
Substate

Sub-statesSub-states
• Sequential SubstatesSequential Substates
These substates occur one after theThese substates occur one after the
other.other.
Awaiting
User
Input
Registering
User Input
Visualizing
User
Input
Working
i/p
Sequential substates within the GUI’s Working state

Awaiting
User
Input
Registering
User Input
Visualizing
User
Input
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
i/p
Working
Watch
System
Clock
Update
Display
[is interval over]
Concurrent substates proceed at the same time.
A dotted line separates concurrent substates.

History StatesHistory States
Working
Screen
Saving
Keystroke or
Mouse movements[is Timeout]

Awaiting
User
Input
Registering
User Input
Visualizing
User
Input
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
i/p
Working
Watch
System
Clock
Update
Display
[is interval over]
H
Keystroke or mouse movement
[is TimeOut]
History States

History StatesHistory States
• Deep History StateDeep History State
If the history state remembers substates atIf the history state remembers substates at
all levels of nesting, then the history stateall levels of nesting, then the history state
isis deepdeep..
• Shallow History StateShallow History State
If the history state remembers only theIf the history state remembers only the
highest nested substate, the history statehighest nested substate, the history state
isis shallowshallow..

• Case StudyCase Study
Draw the state-chart diagram for a fighter plane.Draw the state-chart diagram for a fighter plane.
The fighter plane has the warheads. It spots theThe fighter plane has the warheads. It spots the
targets using infrared imaging and fires air-to-airtargets using infrared imaging and fires air-to-air
missiles after locking the missile system with themissiles after locking the missile system with the
target. It camouflages the signaling while in thetarget. It camouflages the signaling while in the
range of an enemy radar and missile launchrange of an enemy radar and missile launch
system.system.

• It is similar to a flow-chart.It is similar to a flow-chart.
Activity 2
Activity 1

Why Activity Diagrams?
An activity diagram, which resembles a
flowchart, is useful for modeling workflows
and the details of operations.

• It consists of :It consists of :
1. Activity /Action1. Activity /Action
2. Transitions2. Transitions

• ActivitiesActivities
These can be decomposed into activitiesThese can be decomposed into activities
or actions.or actions.
These are not atomic and can beThese are not atomic and can be
interrupted.interrupted.
They take considerable time to complete.They take considerable time to complete.

• Actions :Actions :
Cannot be decomposed further.Cannot be decomposed further.
They are atomic.They are atomic.
They generally take small time forThey generally take small time for
execution.execution.
Example: some expression forExample: some expression for
computation likecomputation like
y=ax+cy=ax+c

State Diagram Carryovers
The following items are common to state
diagrams and activity diagrams:
• activities
• actions
• transitions
• initial/final states
• guard conditions
Bid plan
Do construction

Breaking Up Flows
alternate paths:
• branch
• merge
parallel flows:
• fork
• join

Branching
A branch has one incoming transition and two
or more outgoing transitions:
Charge credit
card
Hold in will-callMail tickets
[today  7 days before show] [today < 7 days before show]

Merging
A merge has two or more incoming transitions
and one outgoing transition:
Customer
sees show
Mail tickets Customer picks
up tickets

Forking
A fork represents the splitting of a single flow
of control into two or more concurrent flows
of control:
Receive order
Process orderLog order

Joining
A join represents the synchronization of two
or more flows of control into one sequential
flow of control:
Pay bill
Bill customerReceive product

Swimlanes
Swimlanes partition groups of activities based
on, for instance, business organizations:
Pay bill
Bill customerReceive product
Customer Billing

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