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Chapter 1
Introduction to UML
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What is the UML?
The Unified Modeling Language is afamily of graphical notations, backed by a
single meta-model, that help in describing
and designing software systems, particularlysoftware systems built using the object-
oriented style.
UML first appeared in 1997 UML is standardized. Its content is
controlled by the Object Management
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What is the UML?
Unified
UML combined the best from object-oriented
software modeling methodologies that were in
existence during the early 1990s.
Grady Booch, James Rumbaugh, and Ivor
Jacobson are the primary contributors to UML.
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What is the UML? Modeling
Used to present a simplified view of reality in
order to facilitate the design and
implementation of object-oriented software
systems.All creative disciplines use some form of
modeling as part of the creative process.
UML is a language for documenting designProvides a record of what has been built.
Useful for bringing new programmers up to
speed.
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Chapter 1. Why We ModelIn this chapter
The importance of modeling
Four principles of modeling
Object-oriented modeling
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Importance of modeling :
A model is a simplification of reality.
We build models so that we can better understand the system
we are developing.
Through modeling, we achieve four aims
1. Models help us to visualize a system as it is or as we want it to
be.
2. Models permit us to specify the structure or behavior of a
system.
3. Models give us a template that guides us in constructing a
system.
4. Models document the decisions we have made.Presentation By Deepthi Sagar
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Principles of Modeling
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Four principles of modeling:
1. The choice of what models to create has a profound
influence on how a problem is attacked and how a
solution is shaped.
2. Every model may be expressed at different levels of
precision.
3. The best models are connected to reality.4. No single model is sufficient. Every nontrivial system
is best approached through a small set of nearly
independent models.
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A Conceptual Model of the UML
A conceptual model needs to be formed by an
individual to understand UML.
UML contains three types of building blocks:
things, relationships, and diagrams. Things
Structural things
Classes, interfaces, collaborations, use cases, components, and
nodes.
Behavioral things
Messages and states.
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A Conceptual Model of the UML
Grouping things
Packages
Annotational things
Notes
Relationships: dependency, association,
generalization and realization.
Diagrams: class, object, use case, sequence,
collaboration, statechart, activity, component anddeployment.
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Conceptual Model of the UML
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Building Blocks of the UML:
The vocabulary of the UML encompasses three kinds ofbuilding blocks:
1. Things
2. Relationships
3. Diagrams
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Conceptual Model of the UML
Things in the UML
There are four kinds of things in the UML:
1. Structural things
2. Behavioral things
3. Grouping things 4. Annotational things
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Conceptual Model of the UML
Structural Things Structural things are the nouns of UML models. These are the
mostly static parts of a model,representing elements that are
either conceptual or physical. In all, there are seven kinds ofstructural things.
Classes
Interface
Cases
Active Classes
Components
Nodes
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Conceptual Model of the UML
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Figure : Classes
Classes:a class is a description of a set of objects that
share the same attributes, operations,relationships,
and semantics. A class implements one or more
interfaces. Graphically, a class is rendered as a
rectangle, usually including its name, attributes,
and operations
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Conceptual Model of the UML
Collaborations:
a collaboration defines an interaction .Thesecollaborations therefore represent the implementation of
patterns that make up a system. Graphically, a collaboration
is rendered as an ellipse with dashed lines, usually including
only its name
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Figure:
Collaborations
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Conceptual Model of the UML
Use Cases:
A use case is realized by a collaboration.
Graphically, a use case is rendered as an ellipse with
solid lines, usually including only its name
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Figure :Use Cases
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Conceptual Model of the UML
Active Classes:
an active class is rendered just like a class, but with
heavy lines, usually including its name, attributes,
and operations
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Figure :Active Classes
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Conceptual Model of the UML
Components:
A component typically representsthe physical packaging of otherwise
logical elements, such as classes,
interfaces, and collaborations.Graphically, a component is rendered
as a rectangle with tabs, usually
including only its name
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Figure :Components
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Conceptual Model of the UML
Nodes: a node is a physical element that exists at
run time and represents a computationalresource, generally having at least some
memory and, often, processing
capability. A set of components may
reside on a node and may also migrate
from node to node. Graphically, a node
is rendered as a cube, usually including
only its name
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Figure :Nodes
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Conceptual Model of the UML
Behavioral Things:
Behavioral things are the dynamic parts of UML models.
These are the verbs of a model, representing behavior over time
and space. In all, there are two primary kinds of behavioral
things.
1. Messages
2. States
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Conceptual Model of the UML
Messages:
an interaction is a behavior that comprises a set of messages
exchanged among a set ofobjects within a particular context toaccomplish a specific purpose. Graphically, a message is rendered as
a directed line, almost always including the name of its operation.
States: astate machine is a behavior that specifies the sequences of states an
object or an
interaction goes through during its lifetime in response to events,
together with its responses to
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Conceptual Model of the UML
Grouping Things: Grouping things are the organizational parts of
UML models. These are the boxes into which amodel can be decomposed. In all, there is one
primary kind of grouping thing, namely, packages.
Packages: Apackage is a general-purpose mechanism for
organizing elements into groups.Graphically, a
package is rendered as a tabbed folder, usually
including only its name and, sometimes, its contents
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Figure: Packages
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What is the UML? Language
UML is primarily a graphical language that
follows a precise syntax.
UML 2 is the most recent version
UML is standardized. Its content is controlled
by the Object Management Group (OMG), a
consortium of companies.
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Conceptual Model of the UML
Annotational Things: Annotational things are the explanatory parts of UML models. These
are the comments you may apply to describe, illuminate, and remarkabout any element in a model.
There is one primary kind of annotation thing, called a note. A note is
simply a symbol for rendering constraints and comments attached to an
element or a collection of elements.
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Figure 2-11 Notes
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How We Got to the UML
OO modeling languages made theirappearance in the late 70s. Smalltalk was
the first widely used OO language.
As the usefulness of OO programmingbecame undeniable, more OO modeling
languages began to appear.
By the start of the 90s there was a flood ofmodeling languages, each with its own
strengths and weaknesses.
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How We Got to the UML
In 1994 the UML effort officially began as a
collaborative effort between Booch and
Rumbaugh. Jacobson was soon afterincluded in the effort.
The goal of UML is to be a comprehensive
modeling language (all things to all people)that will facilitate communication between
all members of the development effort.
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UML Diagrams
UML 2 supports 13 different types ofdiagrams
Each diagram may be expressed with
varying degrees of detail Not all diagrams need be used to model a
SW system
The UML does not offer an opinion as towhich diagrams would be most helpful for a
particular type of project
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UML
Diagrams
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UML
Diagrams
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What is Legal UML?
Even though UML is standardized by theOMG developers will take liberties with
syntax.
These liberties have a way of becomingstandard conventions in later releases of the
language.
The same holds true for natural languages.
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The UML is not Enough
Even if the UML is your primary modeling
language, dont hesitate to use other
diagrams to model your design.
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Architecture
Architecture refers to the different perspectivesfrom which a complex system can be viewed.
The architecture of a software-intensive system is
best described by five interlocking views:
Use case view: system as seen by users, analysts and
testers.
Design view: classes, interfaces and collaborations that
make up the system.
Process view: active classes (threads).
Implementation view: files that comprise the system.
Deployment view: nodes on which SW resides.
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Software Development Life Cycle
UML is involved in each phase of the software
development life cycle.
The UML development process isUse case driven
Architecture-centric
Iterative and incremental
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