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Transcript of 31081831 Airline Reservation System
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DECCAN COLLAGE OF ENGINEERING &
TECHNOLOGY
Dar-us-Salam, Hyderabad -500 001.
DEPARTMENT OF INFORMATIN TECHNOLOGY
OBJECT ORIENTED SYSTEM DEVELOPMENT LAB
CERTIFICATEThis is to certify that
Of B.E. (III/IV) 2nd SEMESTER, IT branch has successfully
completed the MINI PROJECT work during the academic year 2010.
H.O.D Internal Examiner External
INDEX
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S.no Contents Page no
1 Abstract 32 Problem statement 4
3 Proposed system 5
4 SRS of ATM 6
5 About UML 12
6 CLASS DIAGRAM 47
7 USE CASE DIAGRAM 48
8 SEQUENCE DIAGRAM 51
9 COLLABORATION DIAGRAM 52
10 ACTIVITY DIAGRAM 53
11 SWIMLANE DIAGRAM 56
12 STATE CHART DIAGRAM 57
13 COMPONENT DIAGRAM 58
14 DEPLOYMENT DIAGRAM 60
ABSTRACT
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The online reservation system is basically derived from the GDS (global distribution
system) also known as CRS (computer reservation system). The online reservation
system has its database centrally located which is accessed through an Application
Programming Interface (API).With the invent of online reservation system the
traveller and the airline got the freedom to book a seat anywhere at anytime at their
conveniance. The traveller can book a ticket at a click of a mouse saving the time and
money for the traveller. It has also become a hassle free transaction for both the airline
and the travller. The online reservation system involves three main actors the
database , online operator and a databse scheduler. The database scheduler updates the
database , te online operator accepts and confirms the booking and updates the
database.
PROBLEM STATEMENT
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The existing airline reservation system has many shortcomings associated with it. In
the existing system airlines used to set flight reservation levels higher than seatingcapacity to compensate for passenger cancellations and no-shows accounting to
overbooking in the system. If a traveller had to make / cancel reservation he had to
visit either the airline or travel agent frequently to do so thus wasting time and money
for all. In the existing system due to non-availability of a central server the airline and
the agents suffered unwanted delays in bookings and payments. In the existing system
integration of different airlines on a single platforms was not met. With the advent of
the online reservation system these flaws can be overcome.
Proposed statement
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The new online reservation system maintains the database centrally giving the clients
the information required from anywhere in the world whenever required. This system
requires the use of an API (Application Programming Interface) through which it
extracts the data from a central database. The central database monitors all the data
changes that are made at the client side to it and updates it automatically.
Through online reservation system customer is able to book & purchase the ticket
from his home/office conveniently it doesnt require the customer to go to the airline
or an agent to purchase a ticket thus saving time & money for the customer and an
airline/agent. As the information is stored centrally the customer never loses his ticket
as in the existing system.
SOFTWARE REQUIREMENTS SPECIFICATIONAIRLINE RESERVATION SYSTEM
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1. INTRODUCTION
1.1. PURPOSE
The main purpose of this software is to reduce the manual errors involved in
the airline reservation process and make it convenient for the customers to book the
flights as when they require such that they can utilize this software to make
reservations, modify reservations or cancel a particular reservation.
1.2 SCOPE
The name of the software is AIRLINE RESERVATION SYSTEM. This
software provides options for viewing different flights available with different timingsfor a particular date and provides customers with the facility to book a ticket, modify
or cancel a particular reservation but it does not provide the customers with details of
cost of the ticket and it does not allow the customer to modify a particular part of his
reservation and he/she can modify all his details.
1.3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS
ARS-Airline Reservation System
LAN-Local Area Network
GUI-Graphical User InterfaceOS-Operating System
RAM-Random Access Memory
MB-Mega Bytes
GB-Giga Bytes
Mbps-Mega bits per second
HDD-Hard Disk Drive
1.4 REFERENCES
en.wikipedia.org/wiki/Airline_Reservations_System
www.fyxm.net/airline-reservation-system-project-54574.htm
www.ece.cmu.edu/~ece841/team2/index.html
1.5 OVERVIEW
The rest of the document deals about all the main features of this software each will its
purpose and its main functions. It also gives details about the interface with other
products and related functionality of each product.
2. OVERALL DESCRIPTION
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2.1 PRODUCT PERSPECTIVE
The ARS software is an independent application. It is a self-contained product. The
system interfaces, user interfaces and hardware interfaces related with this software
are defined as follows.
2.1.1 System InterfacesThe client systems should be able to share the data available in the data base through
the network connection.
2.1.2 User InterfacesThe screen formats and menu structure should be in such a way that even have users
will find it easy to use. The product must be use-friendly and very inter-active. The
functionality provided by the system like displaying error messages should adapt itself
to the different users of the software.
2.1.3 Hardware InterfacesNil
2.1.4 Software InterfacesName of the language: Visual Basics
2.1.5 Communication Interfaces
There is an LAN used for communication among the different client systems to beused.
2.1.6 Memory ConstraintsThe system would require disk space of 10 GB and a 256 MB HDD and 64 MB RAM
for client systems.
2.1.7 OperationThe users can first make a reservation in a particular flight for a particular date and
time. The system provides the customer with a pin code which gives him access to
either make any changes in his reservation or cancel a reservation. These must also be
back up of data to enable any easy recovery from any features.
2.1.8 Site Adaptive RequirementsThe ARS software is an independent and self-contained product and no
modification are required to adapt to a particular installation.
2.2 PRODUCT FUNCTIONS
The major functions include
Providing flight details
Flight bookings for a particular destination, date and time and also providingwith a pin code.
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Allowing the customer to modify or cancel his reservation provided the correct
pin code is given.
Displaying a report of the number of people flying in a particular flight.
2.3 USER CHARACTERISTICS
No technical experience is required basic knowledge of handling system is sufficient.
2.4 CONSTRAINTS
Regulatory policies: It is a mandatory that no text book must be left empty or
contains insufficient data.
Hardware limitations: There must be a 64 MB on board memory
Control functions: The software must be very user-friendly and displayappropriate error messages.
Interfaces to other applications: Not applicable.
Parallel operations: It must support many users simultaneously.
Reliability requirements: Data redundancy and use of special/blank characters
must be avoided.
Safety/security considerations: The application must be exited always
normally.
Higher order language requirements: VB
2.5 ASSUMPTIONS AND DEPENDENCIES
It is assumed that the details of the cost of ticket are already known to the customer.
Future changes like providing different types of flights with different classes like
business class, economic class will allow the customers to benefit from one facility.
2.6 APPORTIONING OF REQUIREMENTS
The necessity of providing options to customer to choose their seat or to choose for
economic or business class can be delayed until future versions of the software are
developed.
3. SPECIFIC REQUIREMENTS
3.2 SOFTWARE PRODUCT FEATURES
3.2.1 FEATURE 1The ability of the software is to provide the details of the flights available and allow
the customers to choose a particular destination and make a reservation.
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3.2.1.1 PURPOSEThe purpose of this is to enable the users to view the different flights available
so as to make it convenient for him to make a reservation.
3.2.1.2 STIMULUS/RESPONSEOnce the user chooses the particular option, the web pages corresponding tothat are to be displayed on the screen i.e., it will display the different flights
available to their respective destinations and allow the customer to book a
ticket.
3.2.1.3 ASSOCIATED FUNCTIONAL REQUIREMENTS
3.2.1.3.1 FUNCTIONAL REQUIREMENTSOnce the user makes a reservation, he must be provided with a pin
code.
3.2.1.3.1.1 INTRODUCTIONThe user must be provided with the required information within 10
seconds.
3.2.1.3.1.2 INPUTSThe user must enter the destination with date and timings and must
make reservation by giving his personal details like name, address, age,
gender, nationality.
3.2.1.3.1.3 PROCESSINGRecognizing the correct details are entered that a message is displayed
confirming his reservation and displays the pin code.
3.2.2 FEATURE 2The software allows the user to modify an already existing reservation made
by the customer if in case there are any changes that are to be modified in the
reservations of the ticket.
3.2.2.1 PURPOSE
The purpose is to allow the customer to make any changes in his personaldetails or flight booking details.
3.2.2.2 STIMULUS/RESPONSEOnce the user requests for changing his reservation, it must be displayed on the
screen prompting the customer to enter his pin code.
3.2.2.3 ASSOCIATED FUNCTIONALITY REQUIREMENTS
3.2.2.3.1 FUNCTIONAL REQUIREMENTS
If the pin code provided by the customer does not match, then wouldnotify the person by displaying error messages.
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3.2.2.3.1.1 INTRODUCTIONThe system will allow the customer to modify his reservation provided
correct pin code has been entered by him.
3.2.2.3.1.2 INPUTThe user should enter his pin code which gives him access to modify
his reservation.
3.2.2.3.1.3 PROCESSINGThe pin code is processed and checked for his validity. If it is correct
then the user can modify his reservation else an error message will be
displayed asking the user to enter the correct pin code number.
3.2.2.3.1.4 OUTPUT
Given the correct pin code, the user can now modify his reservation. Anew pin code will be generated for the customers.
3.2.3 FEATURE 3The software allows the user to cancel an already existing reservation made by the
customer who has booked the ticket.
3.2.3.1 PURPOSEThe purpose is to allow the customer to cancel his reservation if not required.
3.2.3.1 STIMULUS/RESPONSEOnce the user requests for canceling his reservation, it must be displayed on
the screen prompting the customer to enter his pin code.
3.2.3.3 ASSOCIATED FUNCTIONAL REQUIREMENTS
3.2.3.3.1 FUNCTIONAL REQUIREMENTSIf the pin code provided by the customer does not match, then it would
notify the person by displaying error messages.
3.2.3.3.1.1 INTRODUCTIONThe system will allow the customer to cancel his reservation provided
correct pin code has been entered by the customer.
3.2.3.3.1.2 INPUTThe user should enter his pin code which gives him access to cancel his
reservation.
3.2.3.3.1.3 PROCESSING
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The pin code is processed and checked for its validity. If it is correct,
then the user can cancel his reservation else an error message will be
displayed asking the user to enter the correct pin code number.
3.2.3.3.1.4 OUTPUTGiven the correct pin code, the user can now cancel his reservation.
UNIFIED MODELING LANGUAGE
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Introduction:
The unified modeling language(UML)is a standard language for writing software blue
prints.
The UML is a language for
Visualizing
Specifying
Constructing
Documenting
The artifacts of a software system:
UML is a language that provides vocabulary and the rules for combing words in that
vocabulary for the purpose of communication.
A modeling language is a language whose vocabulary and rules focus on the
concept and physical representation of a system.
Vocabulary and rules of a language tell us how to create
and real well formed models, but they dont tell you what
model you should create and when should create them.
VISUALIZING
The UML is more than just a bunch of graphical symbols. In UML each symbol has
well defined semantics. In this manner one developer can write a model in the UML
and another developer or even another tools can interpret the model unambiguously.
SPECIFYING
UML is used fro specifying means building models that are precise, unambiguous and
complete.
UML addresses the specification of all the important analysis, design and
implementation decisions that must be made in developing and deploying a software
intensive system.
CONSTRUCTING
UML is not a visual programming language but its models can be directly connected
to a variety of programming languages.
This means that it is possible to map from a model in the
UML to a programming language such as java, c++ or Visual Basic or even to tables
in a relational database or the persistent store of an object-oriented database.
This mapping permits forward engineering. The
generation of code from a UML model into a programming language.
The reverse engineering is also possible you can
reconstruct a model from an implementation back into the UML.
DOCUMENTING
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UML is a language for Documenting. A software organization produces all sorts of
artifacts in addition to raw executable code. These artifacts include
Requirements,Architecture,Design,Sourcecode,Project plans,Test,Prototype,Release.
Such artifacts are not only the deliverables of a project,they are also critical in
controlling,measuring and communicating about a system during its development and
after its deployment.
Conceptual model of the UML:
To understand the UML, we need to form a conceptual model of the language and this
requires learning three major elements.
The UML Basic Building Blocks.
The Rules that direct how those building blocks may be put together.
Some common mechanisms that apply throughout the UML.
As UML describes the real time systems it is very important to make a conceptual
model and then proceed gradually. Conceptual model of UML can be mastered bylearning the following three major elements:
UML building blocks
Rules to connect the building blocks
Common mechanisms of UML
This chapter describes all the UML building blocks. The building blocks of UML can
be defined as:
Things Relationships
Diagrams
Things:
Things are the most important building blocks of UML. Things can be:
Structural
Behavioral
Grouping
Annotational
Structural things:The Structural things define the static part of the model. They represent physical and
conceptual elements. Following are the brief descriptions of the structural things.
Class:
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Class represents set of objects having similar responsibilities.
Interface:
Interface defines a set of operations which specify the responsibility of a class.
Collaboration:
Collaboration defines interaction between elements.
Use case:
Use case represents a set of actions performed by a system for a specific goal.
Component:
Component describes physical part of a system.
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Node:
A node can be defined as a physical element that exists at run time.
Behavioral things:
Abehavioral thing consists of the dynamic parts of UML models. Following are the
behavioral things:
Interaction:
Interaction is defined as a behavior that consists of a group of messages exchanged
among elements to accomplish a specific task.
State machine:
State machine is useful when the state of an object in its life cycle is important. It
defines the sequence of states an object goes through in response to events. Events are
external factors responsible for state change.
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Grouping things:Grouping things can be defined as a mechanism to group elements of a UML model
together. There is only one grouping thing available.
Package:
Package is the only one grouping thing available for gathering structural and
behavioral things.
Annotational things:
Annotational things can be defined as a mechanism to capture remarks, descriptions,
and comments of UML model elements. Note is the only one Annotational thingavailable.
Note:
A note is used to render comments, constraints etc of an UML element.
RELATIONSHIP IN UML
Relationship is another most important building block of UML. It shows how
elements are associated with each other and this association describes the functionality
of an application.
There are four kinds of relationships available.
Dependency:
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Dependency is a relationship between two things in which change in one element also
affects the other one.
Association:
Association is basically a set of links that connects elements of an UML model. It also
describes how many objects are taking part in that relationship.
Generalization:
Generalization can be defined as a relationship which connects a specialized element
with a generalized element. It basically describes inheritance relationship in the world
of objects.
Realization:
Realization can be defined as a relationship in which two elements are connected. One
element describes some responsibility which is not implemented and the other one
implements them. This relationship exists in case of interfaces.
UML DIAGRAMS:
UML diagrams are the ultimate output of the entire discussion. All the elements,
relationships are used to make a complete UML diagram and the diagram represents a
system.
The visual effect of the UML diagram is the most important part of the entire process.
All the other elements are used to make it a complete one.
UML includes the following nine diagrams and the details are described in the
following chapters.
Class diagram
Object diagram
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Use case diagram
Sequence diagram
Collaboration diagram
Activity diagram
Statechart diagram
Deployment diagram
Component diagram
We would discuss all these diagrams in subsequent chapters of this tutorial.
ARCHITECTURE OF UML
Any real world system is used by different users. The users can be developers, testers,business people, analysts and many more. So before designing a system the
architecture is made with different perspectives in mind. The most important part is to
visualize the system from different viewer.s perspective. The better we understand the
better we make the system.
UML plays an important role in defining different perspectives of a system. These
perspectives are:
Design
Implementation
Process
Deployment
And the centre is the Use Case view which connects all these four. A Use case
represents the functionality of the system. So the other perspectives are connected
with use case.
Design of a system consists of classes, interfaces and collaboration. UML provides
class diagram, object diagram to support this.
Implementation defines the components assembled together to make a complete
physical system. UML component diagram is used to support implementationperspective.
Process defines the flow of the system. So the same elements as used inDesign are
also used to support this perspective.
Deployment represents the physical nodes of the system that forms the hardware.
UML deployment diagram is used to support this perspective.
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CLASS DIAGRAMOverview:
The class diagram is a static diagram. It represents the static view of an application.
Class diagram is not only used for visualizing, describing and documenting different
aspects of a system but also for constructing executable code of the software
application.
The class diagram describes the attributes and operations of a class and also the
constraints imposed on the system. The class diagrams are widely used in the
modelling of object oriented systems because they are the only UML diagrams which
can be mapped directly with object oriented languages.
The class diagram shows a collection of classes, interfaces, associations,
collaborations and constraints. It is also known as astructural diagram.
Purpose:
The purpose of the class diagram is to model the static view of an application. The
class diagrams are the only diagrams which can be directly mapped with object
oriented languages and thus widely used at the time of construction.
The UML diagrams like activity diagram, sequence diagram can only give the
sequence flow of the application but class diagram is a bit different. So it is the most
popular UML diagram in the coder community.
So the purpose of the class diagram can be summarized as:
Analysis and design of the static view of an application.
Describe responsibilities of a system.
Base for component and deployment diagrams.
Forward and reverse engineering.
How to draw Class Diagram?Class diagrams are the most popular UML diagrams used for construction of software
applications. So it is very important to learn the drawing procedure of class diagram.
Class diagrams have lot of properties to consider while drawing but here the diagram
will be considered from a top level view.Class diagram is basically a graphical representation of the static view of the system
and represents different aspects of the application. So a collection of class diagrams
represent the whole system.
The following points should be remembered while drawing a class diagram:
The name of the class diagram should be meaningful to describe the aspect of the
system.
Each element and their relationships should be identified in advance.
Responsibility (attributes and methods) of each class should be clearly identified.
For each class minimum number of properties should be specified. Because
unnecessary properties will make the diagram complicated.
Use notes when ever required to describe some aspect of the diagram. Because at the
end of the drawing it should be understandable to the developer/coder.
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Finally, before making the final version, the diagram should be drawn on plain paper
and rework as many times as possible to make it correct.
Now the following diagram is an example of an Order System of an application. So itdescribes a particular aspect of the entire application.
First of all Orderand Customerare identified as the two elements of the system and
they have a one to many relationship because a customer can have multiple orders.We would keep Orderclass is an abstract class and it has two concrete classes
(inheritance relationship) SpecialOrderandNormalOrder.The two inherited classes have all the properties as the Orderclass. In addition they
have additional functions like dispatch () and receive ().So the following class diagram has been drawn considering all the points mentioned
above:
Where to use Class Diagrams?
Class diagram is a static diagram and it is used to model static view of a system. The
static view describes the vocabulary of the system.
Class diagram is also considered as the foundation for component and deployment
diagrams. Class diagrams are not only used to visualize the static view of the system
but they are also used to construct the executable code for forward and reverseengineering of any system.
Generally UML diagrams are not directly mapped with any object oriented
programming languages but the class diagram is an exception.
Class diagram clearly shows the mapping with object oriented languages like Java, C+
+ etc. So from practical experience class diagram is generally used for construction
purpose.
So in a brief, class diagrams are used for:
Describing the static view of the system.
Showing the collaboration among the elements of the static view.
Describing the functionalities performed by the system.
Construction of software applications using object oriented languages.
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OBJECT DIAGRAM
Object diagram shows a set of objects and there relationships.Object diagram
represents static snapshot of instances of the things found in class diagram.
These diagrams addresses static design view or static process view of a system.
USE CASE DIAGRAM
Overview:
To model a system the most important aspect is to capture the dynamic behaviour. To
clarify a bit in details, dynamic behaviourmeans the behaviour of the system when it
is running /operating.So only static behaviour is not sufficient to model a system rather dynamic behaviour
is more important than static behaviour. In UML there are five diagrams available to
model dynamic nature and use case diagram is one of them. Now as we have to
discuss that the use case diagram is dynamic in nature there should be some internal or
external factors for making the interaction.
These internal and external agents are known as actors. So use case diagrams are
consists of actors, use cases and their relationships. The diagram is used to model the
system/subsystem of an application. A single use case diagram captures a particular
functionality of a system.
So to model the entire system numbers of use case diagrams are used.
Purpose:
The purpose of use case diagram is to capture the dynamic aspect of a system. But this
definition is too generic to describe the purpose.
Because other four diagrams (activity, sequence, collaboration and Statechart) are also
having the same purpose. So we will look into some specific purpose which will
distinguish it from other four diagrams.
Use case diagrams are used to gather the requirements of a system including internal
and external influences. These requirements are mostly design requirements. So when
a system is analyzed to gather its functionalities use cases are prepared and actors are
identified.Now when the initial task is complete use case diagrams are modelled to present the
outside view.
So in brief, the purposes of use case diagrams can be as follows:
Used to gather requirements of a system.
Used to get an outside view of a system.
Identify external and internal factors influencing the system.
Show the interacting among the requirements are actors.
How to draw Component Diagram?
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Use case diagrams are considered for high level requirement analysis of a system. So
when the requirements of a system are analyzed the functionalities are captured in use
cases.
So we can say that uses cases are nothing but the system functionalities written in an
organized manner. Now the second things which are relevant to the use cases are the
actors. Actors can be defined as something that interacts with the system.The actors can be human user, some internal applications or may be some external
applications. So in a brief when we are planning to draw an use case diagram we
should have the following items identified.
Functionalities to be represented as an use case
Actors
Relationships among the use cases and actors.
Use case diagrams are drawn to capture the functional requirements of a system. So
after identifying the above items we have to follow the following guidelines to draw
an efficient use case diagram.The name of a use case is very important. So the name should be chosen in such a way
so that it can identify the functionalities performed.
Give a suitable name for actors.
Show relationships and dependencies clearly in the diagram.
Do not try to include all types of relationships. Because the main purpose of the
diagram is to identify requirements.
Use note when ever required to clarify some important points.
The following is a sample use case diagram representing the order management
system. So if we look into the diagram then we will find three use cases (Order,
SpecialOrder and NormalOrder) and one actor which is customer.
The SpecialOrderandNormalOrderuse cases are extended from Orderuse case. Sothey have extends relationship. Another important point is to identify the system
boundary which is shown in the picture. The actorCustomerlies outside the system asit is an external user of the system.
INTERACTION DIAGRAM
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We have two types of interaction diagrams in UML. One is sequence diagram and the
other is a collaboration diagram. The sequence diagram captures the time sequence of
message flow from one object to another and the collaboration diagram describes the
organization of objects in a system taking part in the message flow.
So the following things are to identified clearly before drawing the interaction
diagram:
Objects taking part in the interaction.
Message flows among the objects.
The sequence in which the messages are flowing.
Object organization.
Following are two interaction diagrams modeling order management system. The first
diagram is a sequence diagram and the second is a collaboration diagram.
The Sequence Diagram:
The sequence diagram is having four objects (Customer, Order, SpecialOrder and
NormalOrder).
The following diagram has shown the message sequence forSpecialOrderobject and
the same can be used in case ofNormalOrderobject. Now it is important tounderstand the time sequence of message flows. The message flow is nothing but a
method call of an object.
The first call issendOrder () which is a method ofOrderobject. The next call is
confirm () which is a method ofSpecialOrderobject and the last call isDispatch ()which is a method ofSpecialOrderobject. So here the diagram is mainly describing
the method calls from one object to another and this is also the actual scenario whenthe system is running.
The Collaboration Diagram:
The second interaction diagram is collaboration diagram. It shows the object
organization as shown below. Here in collaboration diagram the method call sequenceis indicated by some numbering technique as shown below. The number indicates how
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the methods are called one after another. We have taken the same order management
system to describe the collaboration diagram.
The method calls are similar to that of a sequence diagram. But the difference is that
the sequence diagram does not describe the object organization where as the
collaboration diagram shows the object organization.
Now to choose between these two diagrams the main emphasis is given on the type ofrequirement. If the time sequence is important then sequence diagram is used and if
organization is required then collaboration diagram is used.
Where to use Interaction Diagrams?
We have already discussed that interaction diagrams are used to describe dynamicnature of a system. Now we will look into the practical scenarios where these
diagrams are used. To understand the practical application we need to understand the
basic nature of sequence and collaboration diagram.
The main purposes of both the diagrams are similar as they are used to capture the
dynamic behaviour of a system. But the specific purposes are more important to
clarify and understood.
Sequence diagrams are used to capture the order of messages flowing from one object
to another. And the collaboration diagrams are used to describe the structural
organizations of the objects taking part in the interaction. A single diagram is not
sufficient to describe the dynamic aspect of an entire system so a set of diagrams are
used to capture is as a whole.The interaction diagrams are used when we want to understand the message flow and
the structural organization. Now message flow means the sequence of control flow
from one object to another and structural organization means the visual organization
of the elements in a system.
In a brief the following are the usages of interaction diagrams:
To model flow of control by time sequence.
To model flow of control by structural organizations.
For forward engineering.
For reverse engineering.
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STATE CHART DIAGRAM
Overview:
The name of the diagram itself clarifies the purpose of the diagram and other details. Itdescribes different states of a component in a system. The states are specific to a
component/object of a system.
A Statechart diagram describes a state machine. Now to clarify it state machine can be
defined as a machine which defines different states of an object and these states are
controlled by external or internal events.
Activity diagram explained in next chapter, is a special kind of a Statechart diagram.
As Statechart diagram defines states it is used to model lifetime of an object.
Purpose:
Statechart diagram is one of the five UML diagrams used to model dynamic nature of
a system. They define different states of an object during its lifetime. And these states
are changed by events. So Statechart diagrams are useful to model reactive systems.
Reactive systems can be defined as a system that responds to external or internal
events.
Statechart diagram describes the flow of control from one state to another state. States
are defined as a condition in which an object exists and it changes when some event is
triggered. So the most important purpose of Statechart diagram is to model life time of
an object from creation to termination.
Statechart diagrams are also used for forward and reverse engineering of a system. But
the main purpose is to model reactive system.
Following are the main purposes of using Statechart diagrams:
To model dynamic aspect of a system.
To model life time of a reactive system.
To describe different states of an object during its life time.
Define a state machine to model states of an object.
How to draw Component Diagram?
Statechart diagram is used to describe the states of different objects in its life cycle. So
the emphasis is given on the state changes upon some internal or external events.
These states of objects are important to analyze and implement them accurately.
Statechart diagrams are very important for describing the states. States can be
identified as the condition of objects when a particular event occurs.
Before drawing a Statechart diagram we must have clarified the following points:
Identify important objects to be analyzed.
Identify the states.
Identify the events.
The following is an example of a Statechart diagram where the state ofOrderobject isanalyzed.
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The first state is an idle state from where the process starts. The next states are arrived
for events likesend request, confirm request, and dispatch order. These events are
responsible for state changes of order object.
During the life cycle of an object (here order object) it goes through the following
states and there may be some abnormal exists also. This abnormal exit may occur due
to some problem in the system. When the entire life cycle is complete it is consideredas the complete transaction as mentioned below.
The initial and final state of an object is also shown below.
Where to use Interaction Diagrams?
From the above discussion we can define the practical applications of a Statechart
diagram. Statechart diagrams are used to model dynamic aspect of a system like other
four diagrams disused in this tutorial. But it has some distinguishing characteristics for
modeling dynamic nature.
Statechart diagram defines the states of a component and these state changes are
dynamic in nature. So its specific purpose is to define state changes triggered by
events. Events are internal or external factors influencing the system.
Statechart diagrams are used to model states and also events operating on the system.
When implementing a system it is very important to clarify different states of anobject during its life time and statechart diagrams are used for this purpose. When
these states and events are identified they are used to model it and these models are
used during implementation of the system.
If we look into the practical implementation of Statechart diagram then it is mainly
used to analyze the object states influenced by events. This analysis is helpful to
understand the system behaviour during its execution.
So the main usages can be described as:
To model object states of a system.
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To model reactive system. Reactive system consists of reactive objects.
To identify events responsible for state changes.
Forward and reverse engineering.
ACTIVITY DIAGRAMOverview:
Activity diagram is another important diagram in UML to describe dynamic aspects of
the system.
Activity diagram is basically a flow chart to represent the flow form one activity to
another activity. The activity can be described as an operation of the system.
So the control flow is drawn from one operation to another. This flow can be
sequential, branched or concurrent. Activity diagrams deals with all type of flow
control by using different elements like fork, join etc.
Purpose:
The basic purposes of activity diagrams are similar to other four diagrams. It captures
the dynamic behaviour of the system. Other four diagrams are used to show the
message flow from one object to another but activity diagram is used to show message
flow from one activity to another.
Activity is a particular operation of the system. Activity diagrams are not only used
for visualizing dynamic nature of a system but they are also used to construct the
executable system by using forward and reverse engineering techniques. The only
missing thing in activity diagram is the message part.It does not show any message flow from one activity to another. Activity diagram is
some time considered as the flow chart. Although the diagrams looks like a flow chart
but it is not. It shows different flow like parallel, branched, concurrent and single.
So the purposes can be described as:
Draw the activity flow of a system.
Describe the sequence from one activity to another.
Describe the parallel, branched and concurrent flow of the system.
How to draw Component Diagram?
Activity diagrams are mainly used as a flow chart consists of activities performed by
the system. But activity diagram are not exactly a flow chart as they have some
additional capabilities. These additional capabilities include branching, parallel flow,swimlane etc.
Before drawing an activity diagram we must have a clear understanding about the
elements used in activity diagram. The main element of an activity diagram is the
activity itself. An activity is a function performed by the system. After identifying the
activities we need to understand how they are associated with constraints and
conditions.
So before drawing an activity diagram we should identify the following elements:
Activities
Association
Conditions
Constraints
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This diagram is used to model the activities which are nothing but business
requirements. So the diagram has more impact on business understanding rather
implementation details.
Following are the main usages of activity diagram:
Modeling work flow by using activities.
Modeling business requirements. High level understanding of the system's functionalities.
Investigate business requirements at a later stage.
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COMPONENT DIAGRAMOverview:
Component diagrams are different in terms of nature and behaviour. Component
diagrams are used to model physical aspects of a system.Now the question is what are these physical aspects? Physical aspects are the elements
like executables, libraries, files, documents etc which resides in a node.
So component diagrams are used to visualize the organization and relationships
among components in a system. These diagrams are also used to make executable
systems.
Purpose:
Component diagram is a special kind of diagram in UML. The purpose is also
different from all other diagrams discussed so far. It does not describe the
functionality of the system but it describes the components used to make those
functionalities.
So from that point component diagrams are used to visualize the physical components
in a system. These components are libraries, packages, files etc.
Component diagrams can also be described as a static implementation view of a
system. Static implementation represents the organization of the components at a
particular moment.
A single component diagram cannot represent the entire system but a collection of
diagrams are used to represent the whole.
So the purpose of the component diagram can be summarized as:
Visualize the components of a system.
Construct executables by using forward and reverse engineering.
Describe the organization and relationships of the components.
How to draw Component Diagram?
Component diagrams are used to describe the physical artifacts of a system. This
artifact includes files, executables, libraries etc.
So the purpose of this diagram is different, Component diagrams are used during theimplementation phase of an application. But it is prepared well in advance to visualize
the implementation details.
Initially the system is designed using different UML diagrams and then when the
artifacts are ready component diagrams are used to get an idea of the implementation.
This diagram is very important because without it the application cannot be
implemented efficiently. A well prepared component diagram is also important for
other aspects like application performance, maintenance etc.
So before drawing a component diagram the following artifacts are to be identified
clearly:
Files used in the system.
Libraries and other artifacts relevant to the application. Relationships among the artifacts.
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Now after identifying the artifacts the following points needs to be followed:
Use a meaningful name to identify the component for which the diagram is to
be drawn.
Prepare a mental layout before producing using tools.
Use notes for clarifying important points.
The following is a component diagram for order management system. Here theartifacts are files. So the diagram shows the files in the application and their
relationships. In actual the component diagram also contains dlls, libraries, folders etc.
In the following diagram four files are identified and their relationships are produced.
Component diagram cannot be matched directly with other UML diagrams discussed
so far. Because it is drawn for completely different purpose.
So the following component diagram has been drawn considering all the points
mentioned above:
Where to use Component Diagrams?
We have already described that component diagrams are used to visualize the static
implementation view of a system. Component diagrams are special type of UML
diagrams used for different purposes.
These diagrams show the physical components of a system. To clarify it, we can saythat component diagrams describe the organization of the components in a system.
Organization can be further described as the location of the components in a system.
These components are organized in a special way to meet the system requirements.
As we have already discussed those components are libraries, files, executables etc.
Now before implementing the application these components are to be organized. This
component organization is also designed separately as a part of project execution.
Component diagrams are very important from implementation perspective. So the
implementation team of an application should have a proper knowledge of the
component details.
Now the usage of component diagrams can be described as:
Model the components of a system. Model database schema.
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Model executables of an application.
Model system's source code.
DEPLOYMENT DIAGRAM
Overview:
Deployment diagrams are used to visualize the topology of the physical components
of a system where the software components are deployed.
So deployment diagrams are used to describe the static deployment view of a system.
Deployment diagrams consist of nodes and their relationships.
Purpose:
The nameDeploymentitself describes the purpose of the diagram. Deployment
diagrams are used for describing the hardware components where software
components are deployed. Component diagrams and deployment diagrams are closely
related.
Component diagrams are used to describe the components and deployment diagrams
shows how they are deployed in hardware.
UML is mainly designed to focus on software artifacts of a system. But these two
diagrams are special diagrams used to focus on software components and hardware
components.So most of the UML diagrams are used to handle logical components but deployment
diagrams are made to focus on hardware topology of a system. Deployment diagrams
are used by the system engineers.
The purpose of deployment diagrams can be described as:
Visualize hardware topology of a system.
Describe the hardware components used to deploy software components.
Describe runtime processing nodes.
How to draw Component Diagram?
Deployment diagram represents the deployment view of a system. It is related to the
component diagram. Because the components are deployed using the deployment
diagrams. A deployment diagram consists of nodes. Nodes are nothing but physical
hardwares used to deploy the application.
Deployment diagrams are useful for system engineers. An efficient deployment
diagram is very important because it controls the following parameters
Performance
Scalability
Maintainability
Portability
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So before drawing a deployment diagram the following artifacts should be identified:
Nodes
Relationships among nodes
The following deployment diagram is a sample to give an idea of the deployment view
of order management system. Here we have shown nodes as:
Monitor Modem
Caching server
Server
The application is assumed to be a web based application which is deployed in a
clustered environment using server 1, server 2 and server 3. The user is connecting to
the application using internet. The control is flowing from the caching server to the
clustered environment.
So the following deployment diagram has been drawn considering all the points
mentioned above:
Where to use Deployment Diagrams?
Deployment diagrams are mainly used by system engineers. These diagrams are used
to describe the physical components (hardwares), their distribution and association.To clarify it in details we can visualize deployment diagrams as the hardware
components/nodes on which software components reside.
Software applications are developed to model complex business processes. Only
efficient software applications are not sufficient to meet business requirements.
Business requirements can be described as to support increasing number of users,
quick response time etc.
To meet these types of requirements hardware components should be designed
efficiently and in a cost effective way.
Now a day's software applications are very complex in nature. Software applications
can be stand alone, web based, distributed, mainframe based and many more. So it is
very important to design the hardware components efficiently.So the usage of deployment diagrams can be described as follows:
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To model the hardware topology of a system.
To model embedded system.
To model hardware details for a client/server system.
To model hardware details of a distributed application.
Forward and reverse engineering.
UML NOTATIONS
UML notations are the most important elements in modeling. Efficient and appropriate
use of notations is very important for making a complete and meaningful model. The
model is useless unless its purpose is depicted properly.
So learning notations should be emphasized from the very beginning. Different
notations are available for things and relationships. And the UML diagrams are madeusing the notations of things and relationships. Extensibility is another important
feature which makes UML more powerful and flexible.
The chapter describes the UML Basic Notations in more details. This is just an
extension to the UML buildling block section I have discussed in previous chapter.
Structural Things:
Graphical notations used in structural things are the most widely used in UML. These
are considered as the nouns of UML models. Following are the list of structural things.
Classes
Interface
Collaboration
Use case Active classes
Components
Nodes
Class Notation:
UML class is represented by the diagram shown below. The diagram is dividedinto four parts.
The top section is used to name the class.
The second one is used to show the attributes of the class.
The third section is used to describe the operations performed by the class.
The fourth section is optional to show any additional components.
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Classes are used to represent objects. Objects can be anything having properties and
responsibility.
Object Notation:
The objectis represented in the same way as the class. The only difference is the
name which is underlined as shown below..
As object is the actual implementation of a class which is known as the instance of a
class. So it has the same usage as the class.
Interface Notation:
Interface is represented by a circle as shown below. It has a name which is generally
written below the circle.
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Interface is used to describe functionality without implementation. Interface is the just
like a template where you define different functions not the implementation. When a
class implements the interface it also implements the functionality as per the
requirement.
Collaboration Notation:
Collaboration is represented by a dotted eclipse as shown below. It has a name written
inside the eclipse.
Collaboration represents responsibilities. Generally responsibilities are in a group.
Use case Notation:
Use case is represented as an eclipse with a name inside it. It may contain additional
responsibilities.
Use case is used to capture high level functionalities of a system.
Actor Notation:
An actor can be defined as some internal or external entity that interacts with thesystem.
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Actor is used in a use case diagram to describe the internal or external entities.
Initial State Notation:
Initial state is defined show the start of a process. This notation is used in almost all
diagrams.
The usage of Initial State Notation is to show the starting point of a process.
Final State Notation:
Final state is used to show the end of a process. This notation is also used in almost all
diagrams to describe the end.
The usage of Final State Notation is to show the termination point of a process.
Active class Notation:
Active class looks similar to a class with a solid border. Active class is generally used
to describe concurrent behaviour of a system.
Active class is used to represent concurrency in a system.
Component Notation:
A component in UML is shown as below with a name inside. Additional elements can
be added wherever required.
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Component is used to represent any part of a system for which UML diagrams are
made.
Node Notation:
A node in UML is represented by a square box as shown below with a name. A node
represents a physical component of the system.
Node is used to represent physical part of a system like server, network etc.
Behavioural Things:Dynamic parts are one of the most important elements in UML. UML has a set of
powerful features to represent the dynamic part of software and non software systems.
These features include interactions andstate machines.
Interactions can be of two types:
Sequential (Represented by sequence diagram)
Collaborative (Represented by collaboration diagram)
Interaction Notation:
Interaction is basically message exchange between two UML components. The
following diagram represents different notations used in an interaction.
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Interaction is used to represent communication among the components of a system.
State machine Notation:
State machine describes the different states of a component in its life cycle. The
notations are described in the following diagram.
State machine is used to describe different states of a system component. The state can
be active, idle or any other depending upon the situation.
Grouping Things:
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Organizing the UML models are one of the most important aspects of the design. In
UML there is only one element available for grouping and that is package.
Package Notation:
Package notation is shown below and this is used to wrap the components of a system.
Annotational Things:
In any diagram explanation of different elements and their functionalities are very
important. So UML has notes notation to support this requirement.Note Notation:
This notation is shown below and they are used to provide necessary information of a
system.
Relationships
A model is not complete unless the relationships between elements are described
properly. TheRelationship gives a proper meaning to an UML model. Following arethe different types of relationships available in UML.
Dependency
Association
Generalization
Extensibility
Dependency Notation:
Dependency is an important aspect in UML elements. It describes the dependent
elements and the direction of dependency.
Dependency is represented by a dotted arrow as shown below. The arrow headrepresents the independent element and the other end the dependent element.
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Dependency is used to represent dependency between two elements of a system.
Association Notation:
Association describes how the elements in an UML diagram are associated. In simple
word it describes how many elements are taking part in an interaction.
Association is represented by a dotted line with (without) arrows on both sides. The
two ends represent two associated elements as shown below. The multiplicity is also
mentioned at the ends (1, * etc) to show how many objects are associated.
Association is used to represent the relationship between two elements of a system.
Generalization Notation:
Generalization describes the inheritance relationship of the object oriented world. It is
parent and child relationship.
Generalization is represented by an arrow with hollow arrow head as shown below.
One end represents the parent element and the other end child element.
Generalization is used to describe parent-child relationship of two elements of a
system.
Extensibility Notation:
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All the languages (programming or modeling) have some mechanism to extend its
capabilities like syntax, semantics etc. UML is also having the following mechanisms
to provide extensibility features.
Stereotypes (Represents new elements)
Tagged values (Represents new attributes)
Constraints (Represents the boundaries)
Extensibility notations are used to enhance the power of the language. It is basically
additional elements used to represent some extra behaviour of the system. These extra
behaviours are not covered by the standard available notations.
Abstraction Relationship
An abstraction relationship is a dependency between model elements that represents
the same concept at different levels of abstraction or from different viewpoints. You
can add abstraction relationships to a model in several diagrams, including use-case,
class, and component diagrams.
Activity edgesIn activity diagrams, an activity edge is a relationship between two activity nodes that
you can use to represent the control flow or object flow in an activity diagram.
Aggregation relationships
An aggregation relationship depicts a classifier as a part of, or as subordinate to,another classifier.
Association relationships
In UML models, an association is a relationship between two classifiers, such as
classes or use cases, that describes the reasons for the relationship and the rules that
govern the relationship.
Binding relationships
In UML models, a binding relationship is a relationship that assigns values to template
parameters and generates a new model element from the template.
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Communication paths
In UML modeling, a communication path is a type of association between nodes in a
deployment diagram that shows how the nodes exchange messages and signals.
Composition relationships
A composition relationship, which was named composition association relationship inUML 1.4, represents wholepart relationships and is a form of aggregation. A
composition relationship specifies that the lifetime of the part classifier is dependent
on the lifetime of the whole classifier.
Dependency relationships
In UML modeling, a dependency relationship is a relationship in which changes to one
model element (the supplier) impact another model element (the client). You can use
dependency relationships in class diagrams, component diagrams, deployment
diagrams, and use case diagrams.
Deployment relationshipsIn UML modeling, deployment relationships specify that a particular node type
supports the deployment of an artifact type.
Directed association relationships
In UML models, directed association relationships are associations that are navigable
in only one direction.
Generalization relationships
In UML modeling, a generalization relationship is a relationship in which one model
element (the child) is based on another model element (the parent). Generalization
relationships are used in class, component, deployment, and use case diagrams.
Implementation relationships
In UML modeling, an implementation relationship is a specialized type of realization
relationship between a classifier and a provided interface. The implementation
relationship specifies that the realizing classifier must conform to the contract that the
provided interface specifies.
Include relationships
In UML modeling, an include relationship is a relationship in which one use case (the
base use case) includes the functionality of another use case (the inclusion use case).
The include relationship supports the reuse of functionality in a use case model.
Manifestation relationships
In UML modeling, a manifestation relationship shows which model elements, such as
components or classes, are manifested in an artifact. The artifact manifests, or
includes, a specific implementation for, the features of one or several physical
software components.
Realization relationships
In UML modeling, a realization relationship is a relationship between two model
elements, in which one model element (the client) realizes the behavior that the other
model element (the supplier) specifies. Several clients can realize the behavior of a
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single supplier. You can use realization relationships in class diagrams and component
diagrams.
Usage relationships
In UML modeling, a usage relationship is a type of dependency relationship in which
one model element (the client) requires another model element (the supplier) for fullimplementation or operation.
Common Mechanisms In UML
Specifications
textual statement of syntax & semantics
diagrams give view of specification
Adornments
elements in UML - unique graphical notation
adornments - added information about class
Common Divisions
general property vs. specific instance
class vs. objectuse case vs. use case instance
UML syntax: underline name of instance
separation of interface & implementation
interface - contract
implementation - concrete realization of contract
Extensibility Mechanisms
stereotype
allows creation of new kinds of building blocks from existing ones
tagged value
allows creation of new information in specification
constraint
allows addition of new rules & modification of existing rules
Rules Of UML specify what model should look like
semantic rules for
names
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scope
visibility
integrity
execution
Common properties of models
elided - hide some elements for simplicity
incomplete
inconsistent
rules of UML make it easier to address these problems
TERMS AND CONCEPTS
UML 2.2 has 14 types ofdiagrams divided into two categories.[10] Seven diagram
types represent structural information, and the other seven represent general types of
behavior, including four that represent different aspects of interactions. These
diagrams can be categorized hierarchically as shown in the following class diagram:
UML does not restrict UML element types to a certain diagram type. In general, every
UML element may appear on almost all types of diagrams; this flexibility has been
partially restricted in UML 2.0. UMLprofiles may define additional diagram types or
extend existing diagrams with additional notations.
In keeping with the tradition of engineering drawings, a comment or note explaining
usage, constraint, or intent is allowed in a UML diagram.
Structure diagrams
Structure diagrams emphasize what things must be in the system being
modeled:
Class diagram: the class diagrams describes the structure of a system by
showing the system's classes, their attributes, and the relationships among the
classes.
Component diagram: depicts how a software system is split up into
components and shows the dependencies among these components.
Composite structure diagram: describes the internal structure of a class and the
collaborations that this structure makes possible.
Deployment diagram: serves to model the hardware used in system
implementations, and the execution environments and artifacts deployed on thehardware.
Object diagram: shows a complete or partial view of the structure of a modeled
system at a specific time.
Package diagram: depicts how a system is split up into logical groupings by
showing the dependencies among these groupings.
Profile diagram: operates at the metamodel level to show stereotypes as classes
with the stereotype, and profiles as packages with the
stereotype. The extension relation (solid line with closed, filled
arrowhead) indicate what metamodel element a given stereotype is extending.
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http://en.wikipedia.org/wiki/Category:UML_diagramshttp://en.wikipedia.org/wiki/Unified_Modeling_Language#cite_note-9%23cite_note-9http://en.wikipedia.org/wiki/Class_diagramhttp://en.wikipedia.org/wiki/Profile_(UML)http://en.wikipedia.org/wiki/Class_diagramhttp://en.wikipedia.org/wiki/Component_diagramhttp://en.wikipedia.org/wiki/Composite_structure_diagramhttp://en.wikipedia.org/wiki/Deployment_diagramhttp://en.wikipedia.org/wiki/Object_diagramhttp://en.wikipedia.org/wiki/Package_diagramhttp://en.wikipedia.org/w/index.php?title=Profile_diagram&action=edit&redlink=1http://en.wikipedia.org/wiki/Category:UML_diagramshttp://en.wikipedia.org/wiki/Unified_Modeling_Language#cite_note-9%23cite_note-9http://en.wikipedia.org/wiki/Class_diagramhttp://en.wikipedia.org/wiki/Profile_(UML)http://en.wikipedia.org/wiki/Class_diagramhttp://en.wikipedia.org/wiki/Component_diagramhttp://en.wikipedia.org/wiki/Composite_structure_diagramhttp://en.wikipedia.org/wiki/Deployment_diagramhttp://en.wikipedia.org/wiki/Object_diagramhttp://en.wikipedia.org/wiki/Package_diagramhttp://en.wikipedia.org/w/index.php?title=Profile_diagram&action=edit&redlink=1 -
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Since structure diagrams represent the structure they are used extensively in
documenting the architecture of software systems.
Behavior diagrams
Behavior diagrams emphasize what must happen in the system being modeled:
Activity diagram: represents the business and operational step-by-step
workflows of components in a system. An activity diagram shows the
overall flow of control.
State machine diagram: standardized notation to describe many systems,
from computer programs to business processes.
Use case diagram: shows the functionality provided by a system in terms of
actors, their goals represented as use cases, and any dependencies among
those use cases.
Since behavior diagrams illustrate the behaviour of a system, they are used extensively
to describe the functionality of software systems.
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CLASS DIAGRAM
The class diagram describes the attributes and operations of a class and also the
constraints imposed on the system. The class diagrams are widely used in the
modelling of object oriented systems because they are the only UML diagrams which
can be mapped directly with object oriented languages.
The class diagram shows a collection of classes, interfaces, associations,
collaborations and constraints. It is also known as astructural diagram.
Contents:Class diagrams commonly contain the following things
Classes Interfaces
Collaborations
Dependency,generation and association relationships
Fig: Class Diagram
Class Diagram for Airline Reservation System
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Reservation incharge
Incharge name
incharge id
inchrg location
accept()
reject()
update database()
manage payment()
Traveller
Name
Passport no.
Telephone no.
Address
Viewinfo()Booking()
Payment()
cancel_reservation()
Date_change()
Airline Database
Airline name
Date of update
update time table()
update cost info()
update changes to database()
USE CASE DIAGRAM
Use case diagrams are used to gather the requirements of a system including internal
and external influences. These requirements are mostly design requirements. So when
a system is analyzed to gather its functionalities use cases are prepared and actors are
identified.Now when the initial task is complete use case diagrams are modelled to present the
outside view.
So in brief, the purposes of use case diagrams can be as follows:
Used to gather requirements of a system.
Used to get an outside view of a system.
Identify external and internal factors influencing the system.
Show the interacting among the requirements are actors.
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Fig: Use Case Diagram
INTERACTION DIAGRAM
That is why sequence and collaboration diagrams are used to capture dynamic nature
but from a different angle.
So the purposes of interaction diagram can be describes as:
To capture dynamic behaviour of a system.
To describe the message flow in the system. To describe structural organization of the objects.
To describe interaction among objects.
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accept request
deny requestt
accept payment
Reservation
incharge
show avbl flights
Airline Reservation
Database
pay money
select destination
purchase ticket
Search for flights
make reservation
cancel reservation
traveller
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Fig:Sequence Diagram
Fig: Collaboration Diagram
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SEQUENCE DIAGRAM FOR CHANGING
RESERVATION
TravellerTraveller : Booking
System
: Booking
System
Reservation
incharge
Reservation
incharge
Airline
reservation DB
Airline
reservation DB
1: change reservation2: Get customer details
3: get itineary
4: show itineray
5: select segment
6: present detailed info
7: select avbl flights
8: show avbl flights
9: payment
10: update database
11: generate report
Fig: Sequence Diagram
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COLLABORATION DIAGRAM FOR CHANGINGRESERVATION
R e s e r v a t i o n
i n c h a r g e
Trave l le r
A i r l i n e
r e s e r va t i o n D B
: B o o k i ng
S y s t e m
1 0 : u p d a t e d a t a b a s e
1 : c h a n g e r e s e r va t i o n5 : s e le c t s e g m e n t
4 : s h o w i t i ne r a y6 : p r e s e n t d e t a i le d i n f o
9 : pa y m e n t
1 1 : g e n e r a t e r e p o rt
8 : s h o w a vb l f l igh ts
2 : G e t c u s t o m e r d e t a il s
3 : g e t i t in e a r y
7 : s e l e c t a v b l f l i g h t s
Fig: Collaboration Diagram
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ACTIVITY DIAGRAM
Activity diagram is another important diagram in UML to describe dynamic aspects of
the system.
Activity diagram is basically a flow chart to represent the flow form one activity to
another activity. The activity can be described as an operation of the system.
So the control flow is drawn from one operation to another. This flow can be
sequential, branched or concurrent. Activity diagrams deals with all type of flow
control by using different elements like fork, join et
Branching
A branch specifies alternate paths takes based on some Boolean expression
Branch is represented by diamond
Branch may have one incoming transition and two or more outgoing one on each
outgoing transition,you place a Boolean expression shouldnt overlap but they should
cover all possibilities.
Forking and Joining
ForkA fork represents the splitting of a single flow of control into two or more concurrent
Flow of control.
A fork may have one incoming transition and two or more outgoing transitions, each
of which represents an independent flow of control.
Below fork the activities associated with each of these path continues in parallel.
JoinA join represents the synchronization of two or more concurrent flows of control.
A join may have two or more incoming transition and one outgoing transition.
Above the join the activities associated with each of these paths continues in parallel.
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Swimlane:Swimlanes are useful when we model workflows of business processes to partition the
activity states on an activity diagram into groups.
Each group representing the business organization responsible for those
activities,these groups are called swimlanes.
ACTIVITY DIAGRAM FOR MAKING RESERVATION
Select Flight
Available
Submit Request
Not Available
Accepted Rejected
Payment
View Report
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ACTIVITY DIAGRAM FOR CHANGING RESERVATION
Cancel
Reservation
New reservation Get Refunded
Submit Request
Select Flight
Accept Reject
View Report
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SWIMLANE DIAGRAM FOR AIRLINE RESERVATION
SYSTEM
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Submit
Request
View report
Payment
Print Reciept
View
AcceptReject
Generate
Report
Generate
Receipt
Review data
Store Data
Store data
Retrieve data
Airline re serv ation databaseReserv ation InchargeTraveller
STATE CHART DIAGRAM
A state chart diagrams a state machine, emphasizing the flow of control from state to
state.
Contents
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State chart diagrams commonly contain
Simply state and composite states
Transitions, including events and actions
Common use
They are use to model the dynamic aspects of a system.
Event ordered behavior of any kind of objects, to model reactive objects.
ACTIVE
SubmittingRequest
Processing
Request
Generating
Report
SubmittingRequest
Processing
Request
Generating
Report
START
EXIT
FIG. for the State diagram of Airline Reservation System
COMPONENT DIAGRAM
Component diagrams are different in terms of nature and behaviour. Component
diagrams are used to model physical aspects of a system.
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Now the question is what are these physical aspects? Physical aspects are the elements
like executables, libraries, files, documents etc which resides in a node.
So component diagrams are used to visualize the organization and relationships
among components in a system. These diagrams are also used to make executable
systems.
Fig: Component Diagram
DEPLOYMENT DIAGRAM
Deployment diagrams are used to visualize the topology of the physical components
of a system where the software components are deployed.
So deployment diagrams are used to describe the static deployment view of a system.Deployment diagrams consist of nodes and their relationships.
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Airline
Resevation.exe
.dll doc
ARS.java
.flv
Airline Database
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Purpose:
The nameDeploymentitself describes the purpose of the diagram. Deployment
diagrams are used for describing the hardware components where software
components are deployed. Component diagrams and deployment diagrams are closely
related.
Component diagrams are used to describe the components and deployment diagramsshows how they are deployed in hardware.
Fig: Deployment Diagram
DEPLOYMENT DIAGRAM FOR AIRLINE RESERVATION
SYSTEM
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Fig: Deployment Diagram
Airline
Reservation
Database
ReservationIncharge
Traveller 1 Traveller 2Traveller n