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Sri Vidya College Of Engineering & Technology Course Material (Lecture Notes)
CS6502-OOAD (Unit 1) Page 1
UNIT I
UML DIAGRAMS
INTRODUCTION TO OOAD
Object-oriented analysis and design (OOAD) is a software engineering approach that
models a system as a group of interacting objects. Each object represents some entity of interest
in the system being modeled, and is characterised by its class, its state (data elements), and its
behavior. Various models can be created to show the static structure, dynamic behavior, and run-
time deployment of these collaborating objects. There are a number of different notations for
representing these models, such as the Unified Modeling Language (UML).
Object-oriented analysis (OOA) applies object-modelling techniques to analyze the
functional requirements for a system. Object-oriented design (OOD) elaborates the analysis
models to produce implementation specifications. OOA focuses on what the system does, OOD
on how the system does it.
Object-oriented systems
An object-oriented system is composed of objects. The behavior of the system results
from the collaboration of those objects. Collaboration between objects involves them sending
messages to each other. Sending a message differs from calling a function in that when a target
object receives a message, it itself decides what function to carry out to service that message.
The same message may be implemented by many different functions, the one selected depending
on the state of the target object. The implementation of "message sending" varies depending on
the architecture of the system being modeled, and the location of the objects being
communicated with.
Object-oriented analysis
Object-oriented analysis (OOA) looks at the problem domain, with the aim of producing
a conceptual model of the information that exists in the area being analyzed. Analysis models do
not consider any implementation constraints that might exist, such as concurrency, distribution,
persistence, or how the system is to be built. Implementation constraints are dealt during object-
oriented design (OOD). Analysis is done before the Design. The sources for the analysis can be a
written requirements statement, a formal vision document, interviews with stakeholders or other
interested parties. A system may be divided into multiple domains, representing different
business, technological, or other areas of interest, each of which are analyzed separately.
The result of object-oriented analysis is a description of what the system is functionally
required to do, in the form of a conceptual model. That will typically be presented as a set of use
cases, one or more UML class diagrams, and a number of interaction diagrams. It may also
include some kind of user interface mock-up. The purpose of object oriented analysis is to
develop a model that describes computer software as it works to satisfy a set of customer defined
requirements.
Object-oriented design
Object-oriented design (OOD) transforms the conceptual model produced in object-
oriented analysis to take account of the constraints imposed by the chosen architecture and any
non-functional – technological or environmental – constraints, such as transaction throughput,
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response time, run-time platform, development environment, or programming language. The
concepts in the analysis model are mapped onto implementation classes and interfaces. The
result is a model of the solution domain, a detailed description of how the system is to be built.
UNIFIED PROCESS
The Unified Software Development Process or Unified Process is a popular iterative
and incremental software development process framework. The best-known and extensively
documented refinement of the Unified Process is the Rational Unified Process (RUP). Profile of
a typical project showing the relative sizes of the four phases of the Unified Process.
Overview
The Unified Process is not simply a process, but rather an extensible framework which
should be customized for specific organizations or projects. The Rational Unified Process is,
similarly, a customizable framework. As a result it is often impossible to say whether a
refinement of the process was derived from UP or from RUP, and so the names tend to be used
interchangeably.
The name Unified Process as opposed to Rational Unified Process is generally used to
describe the generic process, including those elements which are common to most refinements.
The Unified Process name is also used to avoid potential issues of trademark infringement since
Rational Unified Process and RUP are trademarks of IBM. The first book to describe the process
was titled The Unified Software Development Process and published in 1999 by Ivar Jacobson,
Grady Booch and James Rumbaugh. Since then various authors unaffiliated with Rational
Software have published books and articles using the name Unified Process, whereas authors
affiliated with Rational Software have favored the name Rational Unified Process.
Unified Process Characteristics
Iterative and Incremental
The Unified Process is an iterative and incremental development process. The
Elaboration, Construction and Transition phases are divided into a series of timeboxed iterations.
(The Inception phase may also be divided into iterations for a large project.) Each iteration
results in
increment, which is a release of the system that contains added or improved functionality
compared with the previous release. Although most iterations will include work in most of the
process disciplines (e.g. Requirements, Design, Implementation, Testing) the relative effort and
emphasis will change over the course of the project.
Use Case Driven
In the Unified Process, use cases are used to capture the functional requirements and to define
the contents of the iterations. Each iteration takes a set of use cases or scenarios from
requirements all the way through implementation, test and deployment.
Project Lifecycle
The Unified Process divides the project into four phases:
Inception
Elaboration
Construction
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Transition
Inception Phase
Inception is the smallest phase in the project, and ideally it should be quite short. If the Inception
Phase is long then it may be an indication of excessive up-front specification, which is contrary
to the spirit of the Unified Process. The following are typical goals for the Inception phase.
Establish a justification or business case for the project Establish the project scope and boundary
conditions Outline the use cases and key requirements that will drive the design tradeoffs
Outline one or more candidate architectures Identify risks Prepare a preliminary project schedule
and cost estimate
The Lifecycle Objective Milestone marks the end of the Inception phase.
Elaboration Phase
During the Elaboration phase the project team is expected to capture a healthy majority of the
system requirements. However, the primary goals of Elaboration are to address known risk
factors and to establish and validate the system architecture. Common processes undertaken in
this phase include the creation of use case diagrams, conceptual diagrams (class diagrams with
only basic notation) and package diagrams (architectural diagrams). The architecture is validated
primarily through the implementation of an Executable Architecture Baseline. This is a partial
implementation of the system which includes the core, most architecturally significant,
components. It is built in a series of small, timeboxed iterations. By the end of the Elaboration
phase the system architecture must have stabilized and the executable architecture baseline must
demonstrate that the architecture will support the key system functionality and exhibit the right
behavior in terms of performance, scalability and cost. The final Elaboration phase deliverable is
a plan (including cost and schedule estimates) for the Construction phase. At this point the plan
should be accurate and credible, since it should be based on the Elaboration phase experience
and since significant risk factors should have been addressed during the Elaboration phase.
Construction Phase
Construction is the largest phase in the project. In this phase the remainder of the system is built
on the foundation laid in Elaboration. System features are implemented in a series of short, time
boxed iterations. Each iteration results in an executable release of the software. It is customary to
write full text use cases during the construction phase and each one becomes the start of a new
iteration. Common UML (Unified Modelling Language) diagrams used during this phase include
Activity, Sequence, Collaboration, State (Transition) and Interaction Overview diagrams. The
Initial Operational Capability Milestone marks the end of the Construction phase.
Transition Phase
The final project phase is Transition. In this phase the system is deployed to the target users.
Feedback received from an initial release (or initial releases) may result in further refinements to
be incorporated over the course of several Transition phase iterations. The Transition phase also
includes system conversions and user training. The Product Release Milestone marks the end of
the Transition phase.
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CS6502-OOAD (Unit 1) Page 4
UML DIAGRAMS
What is UML?
Unified Modelling Language (UML) is the set of notations,models and diagrams used
when developing object-oriented (OO) systems. UML is the industry standard OO visual
modelling language. The latest version is UML 1.4 and was formed from the coming together of
three leading software methodologists; Booch, Jacobson and Rumbaugh. UML allows the
analyst ways of describing structure, behaviour of significant parts of system and their
relationships.
Unified Modeling Language (UML) is a standardized general-purpose modeling
language in the field of software engineering. The standard is managed, and was created by, the
Object Management Group. UML includes a set of graphic notation techniques to create visual
models of software-intensive systems.
The Unified Modeling Language is commonly used to visualize and construct systems
which are software intensive. Because software has become much more complex in recent years,
developers are finding it more challenging to build complex applications within short time
periods. Even when they do, these software applications are often filled with bugs, and it can
take programmers weeks to find and fix them. This is time that has been wasted, since an
approach could have been used which would have reduced the number of bugs before the
application was completed. However, it should be emphasized that UML is not limited simply
modeling software. It can also be used to build models for system engineering, business
processes, and organization structures. A special language called Systems Modeling Language
was designed to handle systems which were defined within UML 2.0. The Unified Modeling
Language is important for a number of reasons. First, it has been used as a catalyst for the
advancement of technologies which are model driven, and some of these include Model Driven
Development and Model Driven Architecture. Because an emphasis has been placed on the
importance of graphics notation, UML is proficient in meeting this demand, and it can be used to
represent behaviors, classes, and aggregation. While software developers were forced to deal
with more rudimentary issues in the past, languages like UML have now allowed them to focus
on the structure and design of their software programs. It should also be noted that UML models
can be transformed into various other representations, often without a great deal of effort.
USE CASE – CLASS DIAGRAMS– INTERACTION DIAGRAMS – STATE DIAGRAMS –
ACTIVITY DIAGRAMS – PACKAGE, COMPONENT AND DEPLOYMENT DIAGRAMS.
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Unit-1_Notes(OOAD).pdf

  • 1. Sri Vidya College Of Engineering & Technology Course Material (Lecture Notes) CS6502-OOAD (Unit 1) Page 1 UNIT I UML DIAGRAMS INTRODUCTION TO OOAD Object-oriented analysis and design (OOAD) is a software engineering approach that models a system as a group of interacting objects. Each object represents some entity of interest in the system being modeled, and is characterised by its class, its state (data elements), and its behavior. Various models can be created to show the static structure, dynamic behavior, and run- time deployment of these collaborating objects. There are a number of different notations for representing these models, such as the Unified Modeling Language (UML). Object-oriented analysis (OOA) applies object-modelling techniques to analyze the functional requirements for a system. Object-oriented design (OOD) elaborates the analysis models to produce implementation specifications. OOA focuses on what the system does, OOD on how the system does it. Object-oriented systems An object-oriented system is composed of objects. The behavior of the system results from the collaboration of those objects. Collaboration between objects involves them sending messages to each other. Sending a message differs from calling a function in that when a target object receives a message, it itself decides what function to carry out to service that message. The same message may be implemented by many different functions, the one selected depending on the state of the target object. The implementation of "message sending" varies depending on the architecture of the system being modeled, and the location of the objects being communicated with. Object-oriented analysis Object-oriented analysis (OOA) looks at the problem domain, with the aim of producing a conceptual model of the information that exists in the area being analyzed. Analysis models do not consider any implementation constraints that might exist, such as concurrency, distribution, persistence, or how the system is to be built. Implementation constraints are dealt during object- oriented design (OOD). Analysis is done before the Design. The sources for the analysis can be a written requirements statement, a formal vision document, interviews with stakeholders or other interested parties. A system may be divided into multiple domains, representing different business, technological, or other areas of interest, each of which are analyzed separately. The result of object-oriented analysis is a description of what the system is functionally required to do, in the form of a conceptual model. That will typically be presented as a set of use cases, one or more UML class diagrams, and a number of interaction diagrams. It may also include some kind of user interface mock-up. The purpose of object oriented analysis is to develop a model that describes computer software as it works to satisfy a set of customer defined requirements. Object-oriented design Object-oriented design (OOD) transforms the conceptual model produced in object- oriented analysis to take account of the constraints imposed by the chosen architecture and any non-functional – technological or environmental – constraints, such as transaction throughput, STUDENTSFOCUS.COM
  • 2. Sri Vidya College Of Engineering & Technology Course Material (Lecture Notes) CS6502-OOAD (Unit 1) Page 2 response time, run-time platform, development environment, or programming language. The concepts in the analysis model are mapped onto implementation classes and interfaces. The result is a model of the solution domain, a detailed description of how the system is to be built. UNIFIED PROCESS The Unified Software Development Process or Unified Process is a popular iterative and incremental software development process framework. The best-known and extensively documented refinement of the Unified Process is the Rational Unified Process (RUP). Profile of a typical project showing the relative sizes of the four phases of the Unified Process. Overview The Unified Process is not simply a process, but rather an extensible framework which should be customized for specific organizations or projects. The Rational Unified Process is, similarly, a customizable framework. As a result it is often impossible to say whether a refinement of the process was derived from UP or from RUP, and so the names tend to be used interchangeably. The name Unified Process as opposed to Rational Unified Process is generally used to describe the generic process, including those elements which are common to most refinements. The Unified Process name is also used to avoid potential issues of trademark infringement since Rational Unified Process and RUP are trademarks of IBM. The first book to describe the process was titled The Unified Software Development Process and published in 1999 by Ivar Jacobson, Grady Booch and James Rumbaugh. Since then various authors unaffiliated with Rational Software have published books and articles using the name Unified Process, whereas authors affiliated with Rational Software have favored the name Rational Unified Process. Unified Process Characteristics Iterative and Incremental The Unified Process is an iterative and incremental development process. The Elaboration, Construction and Transition phases are divided into a series of timeboxed iterations. (The Inception phase may also be divided into iterations for a large project.) Each iteration results in increment, which is a release of the system that contains added or improved functionality compared with the previous release. Although most iterations will include work in most of the process disciplines (e.g. Requirements, Design, Implementation, Testing) the relative effort and emphasis will change over the course of the project. Use Case Driven In the Unified Process, use cases are used to capture the functional requirements and to define the contents of the iterations. Each iteration takes a set of use cases or scenarios from requirements all the way through implementation, test and deployment. Project Lifecycle The Unified Process divides the project into four phases: Inception Elaboration Construction STUDENTSFOCUS.COM
  • 3. Sri Vidya College Of Engineering & Technology Course Material (Lecture Notes) CS6502-OOAD (Unit 1) Page 3 Transition Inception Phase Inception is the smallest phase in the project, and ideally it should be quite short. If the Inception Phase is long then it may be an indication of excessive up-front specification, which is contrary to the spirit of the Unified Process. The following are typical goals for the Inception phase. Establish a justification or business case for the project Establish the project scope and boundary conditions Outline the use cases and key requirements that will drive the design tradeoffs Outline one or more candidate architectures Identify risks Prepare a preliminary project schedule and cost estimate The Lifecycle Objective Milestone marks the end of the Inception phase. Elaboration Phase During the Elaboration phase the project team is expected to capture a healthy majority of the system requirements. However, the primary goals of Elaboration are to address known risk factors and to establish and validate the system architecture. Common processes undertaken in this phase include the creation of use case diagrams, conceptual diagrams (class diagrams with only basic notation) and package diagrams (architectural diagrams). The architecture is validated primarily through the implementation of an Executable Architecture Baseline. This is a partial implementation of the system which includes the core, most architecturally significant, components. It is built in a series of small, timeboxed iterations. By the end of the Elaboration phase the system architecture must have stabilized and the executable architecture baseline must demonstrate that the architecture will support the key system functionality and exhibit the right behavior in terms of performance, scalability and cost. The final Elaboration phase deliverable is a plan (including cost and schedule estimates) for the Construction phase. At this point the plan should be accurate and credible, since it should be based on the Elaboration phase experience and since significant risk factors should have been addressed during the Elaboration phase. Construction Phase Construction is the largest phase in the project. In this phase the remainder of the system is built on the foundation laid in Elaboration. System features are implemented in a series of short, time boxed iterations. Each iteration results in an executable release of the software. It is customary to write full text use cases during the construction phase and each one becomes the start of a new iteration. Common UML (Unified Modelling Language) diagrams used during this phase include Activity, Sequence, Collaboration, State (Transition) and Interaction Overview diagrams. The Initial Operational Capability Milestone marks the end of the Construction phase. Transition Phase The final project phase is Transition. In this phase the system is deployed to the target users. Feedback received from an initial release (or initial releases) may result in further refinements to be incorporated over the course of several Transition phase iterations. The Transition phase also includes system conversions and user training. The Product Release Milestone marks the end of the Transition phase. STUDENTSFOCUS.COM
  • 4. Sri Vidya College Of Engineering & Technology Course Material (Lecture Notes) CS6502-OOAD (Unit 1) Page 4 UML DIAGRAMS What is UML? Unified Modelling Language (UML) is the set of notations,models and diagrams used when developing object-oriented (OO) systems. UML is the industry standard OO visual modelling language. The latest version is UML 1.4 and was formed from the coming together of three leading software methodologists; Booch, Jacobson and Rumbaugh. UML allows the analyst ways of describing structure, behaviour of significant parts of system and their relationships. Unified Modeling Language (UML) is a standardized general-purpose modeling language in the field of software engineering. The standard is managed, and was created by, the Object Management Group. UML includes a set of graphic notation techniques to create visual models of software-intensive systems. The Unified Modeling Language is commonly used to visualize and construct systems which are software intensive. Because software has become much more complex in recent years, developers are finding it more challenging to build complex applications within short time periods. Even when they do, these software applications are often filled with bugs, and it can take programmers weeks to find and fix them. This is time that has been wasted, since an approach could have been used which would have reduced the number of bugs before the application was completed. However, it should be emphasized that UML is not limited simply modeling software. It can also be used to build models for system engineering, business processes, and organization structures. A special language called Systems Modeling Language was designed to handle systems which were defined within UML 2.0. The Unified Modeling Language is important for a number of reasons. First, it has been used as a catalyst for the advancement of technologies which are model driven, and some of these include Model Driven Development and Model Driven Architecture. Because an emphasis has been placed on the importance of graphics notation, UML is proficient in meeting this demand, and it can be used to represent behaviors, classes, and aggregation. While software developers were forced to deal with more rudimentary issues in the past, languages like UML have now allowed them to focus on the structure and design of their software programs. It should also be noted that UML models can be transformed into various other representations, often without a great deal of effort. USE CASE – CLASS DIAGRAMS– INTERACTION DIAGRAMS – STATE DIAGRAMS – ACTIVITY DIAGRAMS – PACKAGE, COMPONENT AND DEPLOYMENT DIAGRAMS. STUDENTSFOCUS.COM
  • 5. Sri Vidya College Of Engineering & Technology Course Material (Lecture Notes) CS6502-OOAD (Unit 1) Page 5 STUDENTSFOCUS.COM
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