Introduction

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Introduction • Role of Analysis and Design in Software development • Purpose of Analysis Models, Design Models • What is meant by Object Orientation? • What is OOAD? • Overview of various OOAD methodologies • Goals of UML

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Introduction. Role of Analysis and Design in Software development Purpose of Analysis Models, Design Models What is meant by Object Orientation? What is OOAD? Overview of various OOAD methodologies Goals of UML. Role of Analysis and Design in Software Development. - PowerPoint PPT Presentation

Transcript of Introduction

Page 1: Introduction

Introduction

• Role of Analysis and Design in Software development

• Purpose of Analysis Models, Design Models• What is meant by Object Orientation?• What is OOAD?• Overview of various OOAD methodologies• Goals of UML

Page 2: Introduction

Role of Analysis and Design in Software Development

• Software development includes tasks like: • Defining the problem, • Determining scope and vision,• Gathering detailed requirements, • Designing, • Programming the system • Testing the developed system,• Delivering the product and• Even maintaining it.

Page 3: Introduction

Role of Analysis and Design in Software Development contd..

• In SSAD approach, requirements-gathering is followed by analyzing the requirements.

• End-product of requirement analysis can be a Data-Flow diagram.

Page 4: Introduction

Analysis

• Investigate problem • Scrutinize requirements• Emphasis on "What is supposed to be done"

rather than "how to do it". • If System to be developed is "Video Library

Management System" then• What is the software developer expected to do

for the client? If manual system present, then study it and get an overview of what he is expected to do.

• Using various tools and techniques, elicit requirements from the customer.

• Make customer aware of the additional capabilities of computer software technology.

Page 5: Introduction

Design

• Provide a blueprint for a solution. • Move from "what is to be done" to "how it is to

be done". • Two types of designs: high-level and low-level

design. • In high-level design, structure of the solution,

interfaces, modules, input/output for modules • In detailed design, internal logic of the modules,

the data structures to be used etc.

Page 6: Introduction

What is Object Orientation? • A term used to describe the object-oriented

method of building software. • Data treated as the most important element.• It cannot flow freely around the system.• Restrictions placed on the number of units that

can manipulate the data. • Encapsulation• Abstraction,Implementation Hiding • Inheritance, Dynamic binding, Polymorphism• Overriding and Overloading

Page 7: Introduction

Encapsulation (SSAD)

• The problem: Write a program to find the Permutation and combination by taking n and r from the user.

• nPr=n!/(n-r)! and nCr=n!/((n-r)!* r!). • Factorial computation is necessary (more than

once). So, in a procedural programming language like C, write the instructions to compute the factorial within a function only once.

• Invoke it multiple times by passing different actual arguments. Thus a function is used as a unit.

Page 8: Introduction

Encapsulation (OO)

• In OO, a class groups related attributes and operations together. The outside world interacts with the data stored in the variables that represent the attributes of the class only through the operations of that class.  

Page 9: Introduction

Encapsulation

Page 10: Introduction

Abstraction

• Consider a radio.

• Radio is one unit. • User not intimidated by complex subunits (Station Management,

Power-Management, Volume Control ) and their working. • To him, the radio works as one abstract unit (with external buttons

to represent these sub-units).

Page 11: Introduction

Abstraction

• Similarly, the class is one abstract unit.• To perform a task that involves an object of that

class, send a message to the object asking it to execute the respective operation.  

Page 12: Introduction

Implementation Hiding

• Manner in which data is stored in an object is hidden from the outside world.

• Suppose dateOfJoining attribute value has to be stored in object e1.

• Either as dd/mm/yy or mm/dd/yy or in some other manner.

• To retrieve date of joining, the user is only interested to get the value in a format understandable to him.

Page 13: Introduction

Inheritance

• Property by which one class inherits the features of another class.

• E.g. Poodle is a Dog, A Dog is a Mammal and a Mammal is an animal.

• A Poodle also has highly specialized features, which distinguishes it from other dogs say Dobermans and Alsatians.

Page 14: Introduction

Inheritance

Page 15: Introduction

Dynamic Binding

• Dynamic/runtime/late binding is a technique in which the piece of code to be executed is determined only at run-time.

Quadrilateral Q = new Quadrilateral();• Rectangle R = new Rectangle();• Square S = new Square();• If users clicks on R then• Q = R;• Else• Q = S;• Q.getArea();

Page 16: Introduction

Dynamic Binding

• No knowledge at compile time which piece of code to execute.

• Depends on user.

Page 17: Introduction

Polymorphism

• Ability to take more than one form. • Consider a class Quadrilateral with

calculateArea(). • Classes Square and Rectangle inherit from

Quadrilateral. • Area of Square= length* length• Area of Rectangle= length * breadth• Thus,Operation with same name takes two

different forms in classes Square and Rectangle.

Page 18: Introduction

Overriding • Overriding of a method in a class is the redefinition of a

method in the sub-classes of that class. • Suppose there was a complex definition of the method

calculateArea() in class Quadrilateral. Let class Rectangle inherit from class Quadrilateral.

• Let the inherited operation calculateArea() be redefined in class Rectangle as length * breadth. Thus calculateArea() is overridden within the class Rectangle.

• If an object of class Rectangle is created and operation calculateArea() is invoked, the Rectangle’s calculateArea() method will be executed

Page 19: Introduction

Overloading

• Term used when several methods within the same class have the same name but different signatures.

• Signature means the number and/or type of input parameters in the method.  

• Consider the following operation named sum in class Add.class Add {int sum(int a,int b);double sum(double a,double b);float sum(float a,float b);int sum(int a,int b,int c)}• Return type is not considered.

Page 20: Introduction

What is Oriented Analysis and Design?

• In OO Analysis, in addition to understanding the requirements, Identify the concepts in the domain. For example, in the VLMS, Patron, DVD, Cassette etc are the concepts (objects).

• In OO Design, Find software objects. Now a conceptual object is a DVD. Its attributes can be capacity, the title of the film that is stored on it, film certification etc.

Page 21: Introduction

Various Methodologies

• Booch• Coad and Yourdon• Fusion• Jacobson: Objectory and OOSE• LBMS SEOO• Rumbaugh OMT• Shlaer and Mellor OO Analysis

Page 22: Introduction

Booch Methodology • Supported by various tools like Visio and

Rational Rose.

• Covers requirement and domain analysis and its major strength is in design.

Page 23: Introduction

Coad and Yourdon Methodology

It focuses on analyzing the business problems. The analysis process has five stages: 1. Subjects 2. Objects3.Structures4. Attributes5. Services

Page 24: Introduction

Coad and Yourdon Methodology

In design, these five activities aresupplanted by and refined into four components: 1.Problem Domain Component 2.Human Interaction Component3.Task Management Component4.Data Management Component

Page 25: Introduction

Fusion

• Developed by Derek Coleman and others.• Borrowed and adapted ideas from other

methodologies. • Incorporated some major ideas from Booch,

Jacobson, Rumbaugh, and others, and explicitly rejected many other ideas from these methodologies.

• Fusion's pragmatic approach holds considerable potential for client/server applications.

Page 26: Introduction

Jacobson: Objectory and OOSE

• Objectory is proprietary. • Object-Oriented Software Engineering

(OOSE) is a simplified version of Objectory.

• Object modeling and many other OO concepts in Objectory and OOSE similar to OO concepts in other methodologies.

• Major distinguishing feature is the use case.

• Drawback with OOSE: assumption that all sequences can be expressed in use cases.

Page 27: Introduction

LBMS SEOO

• Systems Engineering OO (SEOO) is a proprietary methodology and toolkit.

• Tightly integrated with Windows 4GLs such as PowerBuilder.

• Four major components of the SEOO methodology are: Work-breakdown structures and techniques , an object modeling methodology, GUI design techniques and relational database linkages.

Page 28: Introduction

Rumbaugh OMT

• Assumes that a requirements specification exists. Analysis consists of building three separate models:

1.      The Object Model (OM)2.      The Dynamic Model (DM)3.      The Functional Model (FM)

Page 29: Introduction

Shlaer and Mellor OO Analysis

• Information model describing objects, attributes, and relationships.

• A state model describes the states of objects and the transitions between them

• Data-flow diagram that shows the process model.

Page 30: Introduction

Goals of UML

1.Expressive visual modeling language.2.Extensibility and Specialization mechanisms.3.Independence from any particular programming language and development process.4.Encouragement to the growth of OO tool markets.5.Integration of best practices.


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§1.1.1 INTRODUCTION: 1. INTRODUCTION

§1.1.1 INTRODUCTION: 1. INTRODUCTION