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Object Oriented Analysis and Design Using UML. Course description:. OBJECTIVE: The understand the Unified Modeling Language and orient towards Object Oriented methodology using UML for modeling software systems. TARGET AUDIENCE:

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course description
Course description:
  • OBJECTIVE:

The understand the Unified Modeling Language and orient towards Object Oriented methodology using UML for modeling software systems.

  • TARGET AUDIENCE:

In particular, it is intended for software professionals who have sound knowledge of object concepts and some experience towards analysis and design.

  • PREREQUISITES:

Good understanding of object concepts.

Sound knowledge of any object oriented language.

Knowledge of software engineering process.

course description1
Course description:
  • TABLE OF CONTENTS:

Module1 Introduction

Module2 Use case diagram

Module3 Flow of events

Module 4 Realization of the class diagram

Sequence diagram and Collaboration Diagram

Module5 Class diagram and refinement attributes

Module6 State transition and activity diagram

Module7 Implementation diagram

Component diagram and Deployment diagram

Module8 Understanding project culture

Appendix-A

importance of modeling
Importance of modeling
  • What is a model?
    • A model is a simplification of reality
  • Why do we model?
    • help visualizing
    • permit specification
    • provides a template
    • document decisions
4 principles of modeling
4 Principles of Modeling
  • Choose your models well
  • Every model may be expressed at various levels of precision
  • The best models are connected to reality
  • No single model is sufficient
what is software engineering
What is Software Engineering?
  • DEFINITION:The application of systematic, disciplined and qualifiable approach to the development, operation and maintenance of a software system is software engineering.
  • Software development life cycle has following stages:

REQUIREMENT

ANALYSIS

DESIGN

IMPLEMENTATION

TESTING

effort distribution for each stage
Effort Distribution for each stage:

Analysis & design 40 %

Development 20 %

Testing 40 %

Analysis - What is to be done ?

Design - How it is to be done ?

Two Popular methodology approaches are:

  • Structured Analysis & Design
  • Object Oriented Analysis & Design-OO model
major benefits of ooad
Major benefits of OOAD:
  • The object oriented approach is a way of thinking about a problem using

real world concepts instead using adhoc function concepts.

  • We intent to learn OOAD approach for the following reason:
  • Promotes better understanding of user requirements
  • Leads cleaner design
  • Design flexibility'
  • Decomposition of the system is consistent
  • Facilitates data abstraction & information hiding
  • Software reuse
  • Easy maintenance
  • Implementation flexibility
elements of oo methodology
Elements of OO Methodology:

Following are three elements for every OO methodology:

  • Notation
  • Process / Method
  • Tool
what is notation
What is Notation?
  • Notation:

It is collection of graphical symbols for expressing model of the

system.

The Unified Modeling Language [UML] provides a very robust set

of notation which grows from analysis to design.

This brings end of the method wars as far as notation is concerned

with adoption of the language [UML]

By unifying the notations used by these object oriented methods, the unified modeling language provides the basis for a de facto standard in the domain of object oriented analysis and design founded on a wide base of user experience

what is uml
What is UML?
  • It is a Unified Modeling Language, which is mainly a collection of graphical notation that methods use to express the designs.
  • The UML is language for visualizing, specifying, constructing and documenting the artifacts of software system.
  • UML is visual modeling language for modeling systems and is non proprietary
  • UML is not a radical departure from Booch, OMT, OOSE notations but rather legitimate successor to all three.
  • It is an evolutionary step, which is more expressive and more uniform than individual notations.
  • Whitehead says

“ By relieving the brain of unnecessary work, a good notation, sets it free to concentrate on more advance and creative problems “ UML is not a method or process but is the means to express the same.

where can you use the uml
Where can you use the UML?
  • System of several different kinds, absolutely anywhere everywhere.
  • Primarily for software intensive systems like:

Systems software

Business processes

the evolution of the uml
The Evolution of the UML:

OMG vote’97

Submission to OMG, sept’97

Public Feedback

UML1.1

Submission of OMG group

UML1.0

Beta version OOPSLA’96

UML0.9

Unified Method 0.8

Booch

OMT

OOSE

Other method

advantages of uml
Advantages of UML:
  • Captures business processes
  • Enhance communication and ensures the right communication
  • Capability to capture the logical software architecture independent of the implementation language
  • Manages the complexity
  • Enables reuse of design
uml refers to
UML refers to:
  • UML things:

Class, component, node, relationship, package etc..

  • UML diagrams:

Use case diagram, interaction diagram, class diagram, State diagram,deployment diagram

what is process
What is Process?

What isProcess?

  • It is an extensive set of guidelines that address the technical and

organizational aspects of software development focusing on requirements, analysis and design.

  • Process basically encapsulates the activities leading to the orderly construction of system model.
  • OO model supports the iterative and incremental model for the process.
more about process
More about Process?
  • Guidance as to the order of team’s activities
  • It specifies what artifacts should be developed
  • It directs the task of individual developers and team as a whole
  • It offers criteria for monitoring and measuring project activities
  • The selection of particular process will vary greatly depending upon things like problem domain, implementation technology and skills of team
  • Booch,OMT,OOSE and many other methods have well defined process and UML supports almost all methods
  • There has been some convergence on development process practices but there is no consensus for standardization.
  • Framework for the every stage of software development life cycle.
best practices followed by rational unified process
Best Practices followed by Rational Unified Process
  • Develop software iteratively
  • Manage requirements
  • Use component based architectures
  • Visually model software
  • Verify S/W quality
  • Control changes to software.
what is a tool
What is a tool?
  • It is automated support for every stage of software development

life cycle.

  • Since we are concentrating on requirement, analysis and design phase, following are the names of few tools which are greatly in use:

1. Rational Rose

2. Cayenne

3. Platinum

4. Select

why tool
Why Tool?
  • Helps designer for creating designs much more quickly.
  • Supports validations like:

Consistency checking

Completeness checking

Constrain checking.

  • Time required for certain operation could be predicted .
  • Code generation
  • Reverse engineering.
  • Round trip engineering
  • Conversion from SSAD to OOAD
  • Quick documentation…etc
triangle for success
Triangle for Success:
  • All three components play equally important role towards the success of the project.

Notation

Tool

Method

objective of the first module
Objective of the first module:
  • Get introduced with Unified Modeling Language and know the basic components of software development life cycle.
oo model
OO model:

DYNAMIC MODEL

STATIC MODEL

LOGICAL MODEL

PHYSICAL MODEL

The models of Object Oriented Development

models and views
Models and Views:
  • 4+1 view of OO model.
    • Process view
    • Deployment view
    • Logical view
    • Dynamic view

+

    • Use case view
  • As shown in the model , for each dimension we define a number of diagrams that denote a view of the system’s model.
  • The use case view is central since its contents drive the developments of other views.
uml diagrams
UML diagrams:

1. Use case diagram

2. Class Diagram

3. Behavioral diagrams

- State chart diagrams

- Object diagram

- Activity diagrams

- Interaction diagrams

- Sequence diagrams

- Collaboration diagrams

4. Implementation diagrams

- Component diagram

- Deployment diagram

semantics of diagrams
Semantics of Diagrams:
  • Use case diagrams represent the functions of a system from the user’s point of view.
  • Sequence diagrams are a temporal representation of objects and their interactions.
  • Collaboration diagrams are a spatial representation of objects, links, and interactions.
  • Object diagrams represent objects and their relationships, and correspond to simplified collaboration diagrams that do not represent message broadcasts.
  • Class diagrams represent the static structure in terms of classes and relationships.
semantics of diagrams1
Semantics of Diagrams:

Contd...

  • State chart diagrams represent the behavior of a class in terms of states
  • Activity diagrams are to represent the parallel behavior of an operation as a set of actions.
  • Component diagrams represent the logical components of an application.
  • Deployment diagrams represent the deployment of components on particular pieces of hardware.
what is use case diagram
What is USE CASE diagram?
  • A use case diagram establish the capability of the system as a whole.
  • Components of use case diagram:

Actor

Use case

System boundary

Relationship

Actor relationship

  • Semantic of the components is followed.
actor

Manager

Cashier

Customer

ACTOR:

What is an actor?

  • An actor is some one or something that must interact with the system under development
  • UML notation for actor is stickman, shown below.
actor1
ACTOR:

More about an actor:

  • It is role a user plays with respect to system.
  • Actors are not part of the system they represent anyone or anything that must interact with the system.
  • Actors carry out use cases and a single actor may perform more than one use cases.
  • Actors are determined by observing the direct uses of the system,
actor2
ACTOR:

Contd…

  • Those are responsible for its use and maintain as well as other systems that interact with the developed system.
  • An actor may

- input information to the system.

- receive information from the system.

- input to and out from the system.

actor3
ACTOR:

How do we find the actor?

  • Ask following questions to find the actors:
    • Who uses the system?
    • Who installs the system?
    • Who Starts up the system?
    • What other systems use this system?
    • Who gets the information from the system?
    • Who provides information to the system?
  • Actor is always external to the system. They are never part of the

system to be developed.

actor4
ACTOR:

4-Categories of an actor:

  • Principle : Who uses the main system functions.
  • Secondary : Who takes care of administration & maintenance.
  • External h/w : The h/w devices which are part of application

domain and must be used.

  • Other system: The other system with which the system must

interact.

actor5
ACTOR:

Note:

  • If newly identified actor is using a system in a same way like an

existing actor, then new actor can be dropped.

  • If two actors use system in the same way they are same actors.
use case
USE CASE:

What is USE case?

  • A use case is a pattern of behavior, the system exhibits
  • Each use case is a sequence of related transactions performed by an actor and the system in dialogue.
  • USE CASE is dialogue between an actor and the system.
  • Examples:

Withdrawal of cash

from ATM

Open new account

use case1
USE CASE:

More about USE CASE:

  • It is a snapshot of one aspect of system.
  • They model a dialog between actor and system.
  • A use case typically represents a major piece of functionality that is complete from beginning to end.
  • Most of the use cases are generated in initial phase, but you find some more as you proceed.
  • A use case may be small or large. It captures a broad view of a primary functionality of the system in a manner that can be easily grasped by non technical user.
use case2
USE CASE:

Contd…

  • A use case must deliver something of value to an actor.
  • The use cases may be decomposed into other use cases.
  • Use cases also present a good vehicle for project planning.
use case3
USE CASE:

How do we find the use cases?

  • What functions will the actor want from the system?
  • Does the system store information? What actors will create, read, update. Or delete that information?
  • Does the system need to notify an actor about changes in its internal state?
use case4
USE CASE:
  • Generic format for documenting the use case:

- Pre condition: If any

    • Use case : Name of the case.
    • Actors : List of actors(external agents), indicating who initiates the use case.
    • Purpose : Intention of the use case.
    • Overview : Description.
    • Type : primary / secondary.
    • Post condition: If any
  • Typical Course of Events:

ACTOR ACTION : Numbered actions of the actor.

SYSTEM RESPONSE : Numbered description of system responses.

use case5
USE CASE:

USE CASE documentation example:

  • The following use case describes the process of opening a new account in the bank.

Use case :Open new account

Actors :Customer, Cashier, Manager

Purpose :Like to have new saving account.

Description :A customer arrives in the bank to open the new

account. Customer requests for the new account

form, fill the same and submits, along with the

minimal deposit. At the end of complete successful

process customer receives the passbook.

Type :Primary use case.

grouping use cases
Grouping USE CASES:
  • Those use case functionality which are directly dependent on the system environment are placed in interface objects
  • Those functionality dealing with storage and handling of information are placed in entity objects
  • Functionality's specific to one or few use cases and not naturally placed in any of the other objects are placed in control objects

By performing this division we obtain a structure which helps us to understand the system from logical view

ooad use case driven
OOAD --- USE CASE driven

Analysis

Design &

Implementation

Test

Use cases make up the glue

Implement

use cases

Verify that use cases

are satisfied

Capture,clarify

& validate use cases

system boundary
SYSTEM BOUNDARY:

What is System Boundary?

  • It is shown as a rectangle.
  • It helps to identify what is external verses internal, and what the

responsibilities of the system are.

  • The external environment is represented only by actors.
relationship
RELATIONSHIP:

What is Relationship?

  • Relationship between use case and actor.

Communicates

  • Relationship between two use cases

Extends

Uses

  • Notation used to show the relationships:

<< >>

relationship1
RELATIONSHIP:
  • Relationship between use case and actor is often referred as “communicates” .
  • Relationship between two use cases is refereed as either uses or extends.

USES:

  • - Multiple use cases share a piece of same functionality.
  • - This functionality is placed in a separate use case rather than

documenting in every use case that needs it.

relationship2
RELATIONSHIP:

Contd...

  • A uses relationship shows behavior that is common to one or

more use cases.

EXTENDS:

  • It is used to show optional behavior, which is required only

under certain condition.

use case diagram
USE CASE diagram:

Use case diagram for the shown functionality.

Balance status

report

extends

Withdraw cash

Clerk

Customer

uses

Validation

ATM

Manager

objective of the second module
Objective of the second module
  • To understand and capture the detailed specification of a system to be developed, from user perspective.
beginning analysis and design
Beginning Analysis and Design
  • Completion of first version of use case diagram initiates the processes of analysis and design.
  • UML provides the framework to carry out the process of analysis and design in form of set of diagrams.
  • Every diagram and notation used in the diagram carries the semantics.
  • First step towards analysis and design is to specify the flow of events.
flow of events
Flow of Events:
  • A flow of events document is created for each use case.
  • Details about what the system must provide to the actor when the use is executed.
  • Typical contents
    • How the use case starts and ends
    • Normal flow of events
    • Alternate flow of events
    • Exceptional flow of events
  • Typical Course of Events has:

Actor Action(AA)

System Response(SR)

normal flow of events
Normal Flow of Events:

For withdrawal of cash:

  • 1.(SR) The ATM asks the user to insert a card.
  • 2.(AA) The user inserts a cash card.
  • 3.(SR) The ATM accepts the card and reads its serial number.
  • 4.(SR) The ATM requests the password.
  • 5.(AA) The user enters 1234.
  • 6.(SR) The ATM verifies the serial number and password with the

bank and gets the notification accordingly.

  • 7.(SA)The ATM asks the user to select the kind of transaction.
  • 8.(AA)User selects the withdrawal.
normal flow of events1
Normal Flow of Events:

Contd...

  • 9.(SR)The ATM asks for the amount of cash; user enters Rs. 2500/-
  • 10.(SR)The ATM verifies that the amount of cash is within predefined policy limits and asks the bank, to process the transaction which eventually confirms success and returns the new account balance.
  • 11.(SR) The ATM dispenses cash and asks the user to take it.
  • 12.(AA) The user takes the cash.
  • 13.(SR) The ATM asks whether the user wants to continue.
  • 14.(AA) The user indicates no.
normal flow of events2
Normal Flow of Events:

Contd...

  • 15.(SR) The ATM prints a receipt, ejects the card and asks the user to take them
  • 16.(AA) The user takes the receipt and the card.
  • 17.(SR) The ATM asks a user to insert a card.
alternative flow of events
Alternative Flow of Events:

For withdrawal of cash use case:

  • 9. The ATM asks for the amount of cash; the user has change of mind and hits the “cancel”.
exceptional flow of events
Exceptional Flow of Events:

For withdrawal of cash use case:

  • 3 Suspicious pattern of usage on the card.
  • 10 The machine is out of cash.
  • 11 Money gets stuck in the machine.
why flow of events
Why flow of events?
  • It helps in understanding the functionality of a system to be developed.
  • Flow of events helps in finding objects of the system to be developed.
  • Happens to be most important and very first step towards analysis and design.
what is scenario
What is Scenario?
  • The functionality of the use case is captured in flow of the

events.

  • A scenarios is one path through the flow of events for the use

case.

  • Scenarios are developed to help identify objects, classes and

object interactions for that use case.

objective of the third module
Objective of the third module
  • To understand the flow of each functionality and find out the objects and methods required to build the system.
use case realizations
USE CASE Realizations:
  • The use case diagram presents an outside view of the system
  • Interaction diagrams describe how use cases are realized as interactions among societies of objects.
  • Two types of interaction diagrams
    • Sequence diagrams
    • Collaboration diagrams
what is interaction diagram
What is Interaction diagram?
  • Interaction diagrams are models that describe how groups of objects collaborate in some behavior
  • There are 2 kinds of interaction diagrams
    • Sequence diagram
    • Collaboration diagram
  • Sequence diagrams are a temporal representation of objects and their interactions
  • Collaboration diagrams are spatial representation of objects, links and interrelations
what is sequence diagram
What is sequence diagram?
  • Typically these diagrams capture behaviors of the single scenario.
  • Shows object interaction arranged in time sequence.
  • They show sequence of messages among the objects.
  • It has two dimensions, vertical represents time & horizontal
  • represents objects.
  • Components of sequence diagram:

-objects

-object lifeline

-Message

-pre/post conditions.

object object life line

Name:Class

OBJECT & OBJECT LIFE LINE:
  • Object are represented by rectangles and name of the objects are
  • underlined.
  • Object life line are denoted as dashed lines. They are used to
  • model the existence of objects over time.
messages
MESSAGES:
  • They are used to model the content of communication between objects. They are used to convey information between objects and enable objects to request services of other objects.
  • The message instance has a sender, receiver, and possibly other information according to the characteristics of the request.
  • Messages are denoted as labeled horizontal arrows between life lines.
  • The sender will send the message and receiver will receive the message.
messages1
MESSAGES:

Contd…

  • May have square brackets containing a guard conditions. This is a Boolean condition that must be satisfied to enable the message to be sent.
  • May have have an asterisk followed by square brackets containing an iteration specification. This specifies the number of times the message is sent.
  • May have return list consisting of a comma -separated list of names that designate the values of returned by the operation.
  • Must have a name or identifier string that represents the message.
  • May have parentheses containing an argument list consisting of a comma separated list of actual parameters passed to a method.
slide69

Insert card

Request password

Enter the password

Verify account

Account o.k.

Request option

Enter option

Create

Transaction

:Transaction

Request amount

Enter the amount

Update transaction

Transaction commit

Transaction

complete

Dispense cash

Request take cash

Take cash

Request continuation

Terminate

Print receipt ,eject card

Request take card

Take card

Display main screen and prompt for the card.

Sequence diagram [for withdrawal of cash, normal flow]

:Customer

:ATM

:Bank

what is collaboration diagram
What is Collaboration diagram?
  • Collaboration diagrams illustrate the interaction between the objects, using static spatial structure.
  • Unlike sequence diagram the time is not explicitly represented in these diagrams
  • In collaboration diagram the sequence of messages is indicated by numbering the messages. The UML uses the decimal numbering scheme.
  • In these diagrams, an actor can be displayed in order to represent the triggering of interaction by an element external to the system.
  • This helps in representing the interaction, without going into the details of user interface.
components of collaboration diagram
Components of collaboration diagram:
  • Named objects
  • Links: Links are represented by a continuous line between objects, and indicates the exchange of messages.
  • Messages has following attributes:
      • Synchronization --thread name, step within thread.
      • Sequence number
      • Message labels : The name of the message often corresponds to an operation defined in the class of the object that is the destination of the message. Message names may have the arguments and return values.
      • *[iteration].
      • It uses decimal notation.
      • Message direction.
semantics of components
Semantics of components:
  • Object names identify which objects are participating and the links show which objects collaborate
  • A link between two objects must exist for one object to send message to another and vice a versa.
  • Messages in the collaboration diagram get transformed to more detailed signature.
  • They use the decimal notation system for numbering the messages.
  • The direction of the message defines the sender and receiver of the message
the elements of message
The elements of message:
  • Predecessor
  • Role names
  • Message qualifiers
    • Iteration expression
    • Parameters
    • Return values
    • Guard
    • Message stereotypes
  • Concurrent thread sequencing
  • Thread dependencies
  • Message expression

[Pre] A1:*(expression):doIt(p,r):return value

collaboration diagram for withdrawal of cash normal flow

CUST-

OMER

TRANSA-

CTION

ATM

BANK

Collaboration diagram [for withdrawal of cash, normal flow.]

1. Insert card

Enter password, Enter kind

Enter amount,

Take cash, Take card

cancel,Terminate, Continue

Create Transaction

Transaction complete

Display main screen

unreadable card message,

request password,

request kind, request amount,

canceled message, eject card, failure message,

dispense cash, request take cash

request continuation,

print receipt, request take card

bad account message,

bad bank account message

Transaction succeed

Transaction failed

account o.k.

bad account,

bad password,

bad bank code

Verify account,

process transaction

objective of the fifth module
Objective of the fifth module
  • To know the interaction among the objects in temporal and spatial form.
  • To know how objects collaborate among each other and hence delegate the responsibility to the respective objects.
  • To understand how the messages get matured with more information.
what is class diagram
What is Class diagram?
  • A class diagram shows the existence of classes and their relationships in the logical view of a system
  • UML modeling elements in class diagrams are:
    • Classes, their structure and behavior.
    • relationships components among the classes like association, aggregation, composition, dependency and inheritance
    • Multiplicity and navigation indicators
    • Role names or labels.
major types of classes
Major Types of classes:

Concrete classes

  • A concrete class is a class that is instantiable; that is it can have different instances.
  • Only concrete classes may be leaf classes in the inheritance tree.

Abstract classes

  • An abstract class is a class that has no direct instance but whose descendants classes have direct instances.
  • An abstract class can define the protocol for an operation without supplying a corresponding method we call this as an abstract operation.
  • An abstract operation defines the form of operation, for which each concrete subclass should provide its own implementation.
relationship3
RELATIONSHIP:
  • Association
  • Aggregation
  • Composition
  • Inheritance
  • Dependency
  • Instantiation
association

CUSTOMER

ATM system

ASSOCIATION:

These are the most general type of relationship:

  • It denotes a semantic connection between two classes
  • It shows BI directional connection between two classes
  • It is a weak coupling as associated classes remain somewhat independent of each other
  • Example:
aggregation
AGGREGATION:

This is a special type of association

  • The association with label “contains” or “is part of” is an aggregation
  • It represents “has a “ relationship
  • It is used when one object logically or physically contains other
  • The container is called as aggregate
  • It has a diamond at its end
  • The components of aggregate can be shared with others
  • It expresses a whole - part relationships
aggregation1
AGGREGATION:

Example:

ATM card

Customer

composition
COMPOSITION:

This is a strong form of aggregation

  • It expresses the stronger coupling between the classes
  • The owner is explicitly responsible for creation and deletion of the part
  • Any deletion of whole is considered to cascade its part
  • The aggregate has a filled diamond at its end

Window

Client Area

inheritance
INHERITANCE:
  • The inheritance relationship helps in managing the complexity by ordering objects within trees of classes with increasing levels of abstraction. Notation used is solid line with arrowhead,shown below.
  • Generalization and specialization are points of view that are based on inheritance hierarchies.

Account

CurrentAccount

SavingAccount

dependency

Client

Server

DEPENDENCY:
  • Dependency is semantic connection between dependent and independent model elements.
  • This association is unidirectional and is shown with dotted arrowhead line.
  • In the following example it shows the dependency relationship between client and server.
  • The client avails services provided by server so it should have semantic knowledge of server.
  • The server need not know about client.
instantiation

Element

Queue

Queue<int>

INSTANTIATION

This relationship is defined between parameterized class and actual class.

  • Parameterized class is also referred as generic class.
  • A parameterized class can’t have instances unless we first instantiated it

Example:

what is cardinality
What is Cardinality? :

Definition: Number of instances of each class involved in the dialogue is specified by cardinality.

  • Common multiplicity values:
  • Symbol Meaning
  • 1 One and only one
  • 0..1 Zero or one
  • M…N From M to N (natural integer)
  • 0..* From zero to any positive integer
  • 1..* From one to any positive integer
  • Also thought can be given about navigability to every applicable relationship.
reaching the class diagram
Reaching the class diagram:
  • In collaboration diagram we have shown the objects, their interaction and detailed message signature.
  • This information is carried forward to the class diagram.
  • At this point,we group the similar objects and form classes.
  • Messages get mapped to responsibilities for respective classes.
  • Find the attributes for every class.
  • Transform the links to appropriate relationships.
  • Relationship is further refined with respect to multiplicity and navigability.

This complete procedure brings the minimal class diagram [for withdraw cash use case, normal flow.]

class diagram for withdrawal of cash normal flow
Class diagram[for withdrawal of cash, normal flow]

Customer

1

1

1..*

1..*

1..*

1..*

ATMSystem

0..*

0..*

Transaction

1

1

1

1

1..*

1..*

Bank[Branch]

1

1

what more to the class diagram
What more to the Class Diagram?
  • Till this slide we have worked out the essentials of class diagram for withdrawal of cash use case, normal flow of events.
  • Similar exercise required to be carried out for every scenario and clubbed all in the class diagram.
  • At this point, we refine this integrated class diagram to add further fine details. Approximate sketch for this class diagram has been shown at the end of this module.
  • Refinement attributes should be updated right from sequence diagram to class diagram.
  • Next few slides will take into the discussion of refinement attributes.
  • This process of iterative and incremental development will continue till there is no change in two consecutive iteration.
ooad iterative incremental approach
OOAD---Iterative & Incremental Approach

Identify objects

Identify Messages

Validate Classes

& Objects

Group Objects

into classes

Group classes

into domains

Identify & classify

Class relationships

Identify class

behavior

refinement attributes
Refinement attributes:

Stereotypes:

  • Stereotypes are part of the range of extensibility mechanism provided by UML
  • It permits user to add new model element classes on top of the kernel predefined by UML
refinement attributes1
Refinement attributes:

Contd…

Constraints:

  • Constraints are functional relationship between the entities and object

model. The entities include objects, classes, attributes, association, links.

  • A constraint restricts the values that entities can assume.
  • UML doesn't specify a particular syntax for constraints, other than they should appear between braces, so they may therefore be expressed using natural language, pseudo code, navigation expression or mathematical expression
  • UML1.2 does prefer the use of a constraint language OCL i.e. Object Constraint Language, which is subset of UML.
refinement attributes2
Refinement attributes:

Example:Constraints

  • Number of withdrawal transaction should be less than five per day.

Constraint on the same class.

Transaction

{No. of transaction <=5 /day}

  • No window will have an aspect ratio i.e. (length/width) of less than 0.8 or > 1.5

Window

length/width

A constraint between the

properties of the same object

{0.8<=length/width <= 1.5}

refinement attributes3
Refinement attributes:

Qualifier:

  • UML provides a role of constraint notation to indicate different kind of collections that may be inherent in the analysis model
  • Common role constraints for multi valued roles include

{ordered} Collection is maintained in sorted manner

{bag} Collection may have multiple copies of same item.

{set} Collection may have at most one copy of given item.

  • Some constraints may be combined such as: {ordered set}
refinement attributes4
Refinement attributes:

Qualifier:

  • Another common design scheme is to use a key value to retrieve an item from the collection. This is called as qualified association and the key value as qualifier.
  • A qualified association is the UML equivalent of a programming concept variously known as associative arrays, maps,dictionaries
  • A qualified association relates two object classes and a qualifier
  • The qualifier is a special attribute that reduced the effective multiplicity of an association.
  • One to many and manyto many association may be qualified.
refinement attributes5
Refinement attributes:
  • Check for many to many relationship, if any, normalize with qualifier or association class.
  • Check for the scope forming abstract classes and template classes.
  • Check for helper functions.
  • Thought can be given for using the design patterns.
objective of the fifth module1
Objective of the fifth module:
  • Learn to build the architecture, which contains the entire information of the system to be developed.
  • It is this architecture which is called as BLUE PRINT is handed over for coding.
refined class diagram for withdrawal of cash
Refined Class diagram [for withdrawal of cash]

Few morerelationship can be further added to the shown diagram:

Area

ATMSystem

BatchJob

1..*

1..*

Cash

BankComputer

1

1

Bank[Branch]

<<abstract>>

AccountAccessor

1

1

1

1

<<abstract>>

person

Transaction

CashierStation

1..*

1..*

1

1

ATMScreen

Customer

BankAssociates

Slips

1..*

1..*

1

1

<<abstract>>

TellerScreen

Account

0..1

0..1

1

1

BankCard

NoteHelpForBankCard

1

1

SavingAccount

CurrentAccount

what is state transition diagram
What is state transition diagram?
  • A state transition diagram shows the states of a single object, the events or the messages that cause a transition from one state to another and the action that result from a state change.
  • A state transition diagram will not be created for every class in the system.

Components of State Diagram:

    • Start State
    • Stop state
    • State Transition
semantics of every components
Semantics of every components:
  • State: A state is a condition during the life of an object when it satisfies some condition, performs some action, or waits for an event.

The UML notation for a state is a rectangle with rounded corners.

  • Special states:There are two special states.

Start state: Each state diagram must have one and only one start

state. Notation for start state is “filled solid circle”.

Stop State: An object can have multiple stop states. Notation for stop

state is bull’s eye.

semantics of every components1
Semantics of every components:

Contd...

  • State transition: A state transition represents a change from an originating to a successor state.
  • Transition label: event name[guard condition] / action
state transition diagram for account class
State Transition Diagram [for Account class. ]

request and fill the form for new saving account[ validate ] / process

Open

transaction request[ validate ] / update()

transactionStrart / Transfer_to_main_ledger ()

Operational

Dormant

no transaction / Transfer_to_Dormant_Ledger

fill_the_request_form/update()

Fraud or authorized instruction[Validate]

/ lockAccount()

matter_resolved[ validate ] / unlockAccount()

close

seized

fill_the_request_form / update()

Note:Account can be closed from open state as well

more about state diagram
More about State Diagram:
  • A state diagram will not be created for every class.
  • state diagrams are used only for those classes that exhibit interesting behavior.
  • State diagrams are also useful to investigate the behavior of user interface and control classes.
  • State diagram are used to show dynamics of a individual class
what is activity diagram
What is activity diagram?

It is a special kind of state diagram and is worked out at use case level.

  • These are mainly targeted towards representing internal behavior of a a use case.
  • These may be thought as a kind of flowchart.
  • Flowcharts are normally limited to sequential process; activity diagrams can handle parallel process.
  • Activity diagrams are recommended in the following situations:
        • Analyzing use case
        • Dealing with multithreaded application
        • Understanding workflow across many use cases.
consistency checking
Consistency Checking

Consistency checking is the process of ensuring that, information in both static view of the system(class diagram) and the dynamic view of the system(sequence and collaboration diagram) is telling the same story.

objective of the sixth module
Objective of the sixth module
  • Understand the dynamic behavior of a class
  • Way to find the parallel processes at use case level.
what is component diagram
What is component diagram?

COMPONENT DIAGRAM:

  • Component diagrams illustrate the organizations and dependencies among software components.
  • A component may be
    • A source code component
    • A run time components
    • An executable component
    • Dependency relationship.
component diagram for withdrawal of cash
Component Diagram[for withdrawal of cash]

policy.dll

Bank

Server.exe

Branch

customer.dll

Bank.dll

Branch

Bank.exe

ATM.exe

what is deployment diagram
What is deployment diagram?
  • A deployment diagram shows the relationship among software and hardware components in the delivered system.
  • These diagram include nodes and connections between nodes.
  • Each node in deployment diagram represents some kind of computational unit, in most cases a piece of hardware.
  • Connection among nodes show the communication path over which the system will interact.
  • The connections may represent direct hardware coupling line RS-232 cable, Ethernet connection, they also may represent indirect coupling such as satellite to ground communication.
deployment diagram
Deployment diagram

Branch

Bank_

Bank.exe

Ethernet

Ethernet

Bank_

server

ATM_

machine

BankServer.exe

ATM.exe

objective of the seventh module
Objective of the seventh module:
  • To understand the organization of software modules and their deployment on the respective hardware.
understanding the project culture
Understanding the project culture

It may be:

1.Calendar Centric

2.Requirement Centric

3.Documentation Centric

4.Quality Centric

5.Architecture Centric

understanding the project s culture
Understanding the project’s culture
  • Architecture driven projects represent the most mature style of development.
  • These projects are characterized by a focus on creating a frame work that satisfies all known requirement, yet is resilient enough to adapt to those requirements, that are not yet known or well understood.
  • In every sense of the word, architect-driven policies are in evolutionary step beyond requirement driven policies.
  • Architecture driven style of development is usually the best approach for the creation of most complex software intensive systems
understanding the project s culture1
Understanding the project’s culture

Architecture driven style of development typically observe the following process:

1. Specify the system’s desired behavior through a collection of

scenarios. (Analysis)

2. Create, then validate, an architecture. (Design)

3. Evolve that architecture, making mid-course corrections as

necessary to adopt to new requirements as they are uncovered.

ooad architecture centric
OOAD---Architecture Centric

What exactly is nature of the well structured object oriented architecture??

1. A set of classes, typically organized into multiple hierarchies.

2. A set of collaboration that specify how those classes co-operate

to provide various system function.

essence of ooad and uml
ESSENCE OF OOAD AND UML

Use case driven

Architecture centric

Incremental and iterative approach.

desire for good architecture
Desire for good Architecture

Those of us who have been trained as architects have this desire perhaps at the very center of our lives,that one day, some where somehow, we shall build one building which is wonderful, beautiful, breathtaking, a place where people can walk and dream for centuries.

CHRISTOPHER ALEXANDER

Same desire should also be applicable in creating software architecture as well.

slide124

Strong recommendation

  • Object Technology
    • David A. Taylor
  • Object Oriented Analysis and design with Applications
    • Grady Booch
  • UML distilled
    • Martin Fowler
  • Instant UML
    • Pierre - Alain Muller
  • Software Engineering
    • Roger S Pressman
references
REFERENCES

Contd...

  • Object Oriented Modeling and Design
    • James Rumbaugh
  • Object Oriented Software Engineering
    • Ivar Jacobson
  • Clouds to code
    • Jesse Liberty
    • Applying use cases
    • Geri Schneider
    • Jason p. Winters
    • UML Toolkit
    • Hans-Eriksson and Magnus Penker

Version1.1

course description2
Course description:
  • SESSION BREAKUP:

The course will be offered in series of fourteen hours theory session. One demonstration session on the tool like Rational Rose can be accompanied.The following is the suggested agenda for the course.

SessionDuration

Module-1,2 2-hours demonstration lecture

Module-3 2-hours

Module-4 2-hours

Module-5 4-hours

Module-6 2-hours

Module-7,8 2-hours

Demonstration 2-hours

course description3
Course description:
  • REFERENCE AND READING MATERIALS:

Refer to Appendix-A

  • EXERCISE AND HANDS ON:

One case study should be given to the group of four members.

  • TEST:

Case study given for exercise can be evaluated as part of the test.

course description4
Course description:
  • INSTRUCTION TO THE FACULTY:

Course should emphasize on OO modeling.

Focus should be primarily on understanding UML[1.2] and UML diagrams and then applying to a problem.

Several excellent references are given in Appendix-A. Following are strongly recommended reading and should be used as supplementary with this power point courseware.

1.UML toolkit by Eriksson and Magnus Penker

2.Object oriented analysis and design with applications by Grady Booch

Note: UML toolkit should be refereed for UML notations,their syntax and semantics.

Object oriented analysis and design with applications should be refereed for OO concepts.