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next gen pos.pdf
- 1. Object Oriented Analysis and Design
V Semester CSE
© Vignesh Saravanan K, AP/CSE
Lecture-5
Case Study - the Next Gen POS system
UNIT I – UNIFIED PROCESS AND USE CASE
DIAGRAMS
- 2. © Vignesh Saravanan K, AP/CSE
Object Oriented Analysis and Design
RAMCO INSTITUTE OF TECHNOLOGY
2
Next Gen POS System
The case study is the NextGen point-of-sale (POS) system
There are very interesting requirement and design problems to solve.
A POS system is a computerized application used (in part) to record
sales and handle payments; it is typically used in a retail store.
It includes hardware components such as a computer and bar code
scanner, printer and software to run the system.
These systems must be relatively fault-tolerant.
It interfaces to various service applications, such as a third-party tax
calculator and inventory control
- 3. © Vignesh Saravanan K, AP/CSE
Object Oriented Analysis and Design
RAMCO INSTITUTE OF TECHNOLOGY
3
Next Gen POS System
A POS system increasingly must support multiple and varied
client-side terminals and interfaces.
These include a thin-client Web browser terminal, a regular
personal computer with something like a Java Swing graphical user
interface, touch screen input, wireless PDAs, and so forth.
we are creating a commercial POS system that we will sell to
different clients with disparate needs in terms of business rule
processing
- 4. © Vignesh Saravanan K, AP/CSE
Object Oriented Analysis and Design
RAMCO INSTITUTE OF TECHNOLOGY
4
Next Gen POS System
Each client will desire a unique set of logic to execute at different scenarios:
such as when a new sale is initiated
when a new line item is added
Therefore, we will need a mechanism to provide this flexibility and
customization
So we need to go for the iterative development strategy
Applications generally can be divided into 3 layers
User interface
Application logic
Other components/layers
- 5. © Vignesh Saravanan K, AP/CSE
Object Oriented Analysis and Design
RAMCO INSTITUTE OF TECHNOLOGY
5
Next Gen POS System
- 6. © Vignesh Saravanan K, AP/CSE
Object Oriented Analysis and Design
RAMCO INSTITUTE OF TECHNOLOGY
6
Case Study Focus
A typical object-oriented information system is designed in terms of several
architectural layers or subsystems
User Interface—graphical interface; windows.
Application Logic and Domain Objects—software objects representing
domain concepts (for example, a software class named Sale) that fulfil
application requirements.
Technical Services—general purpose objects and subsystems that provide
supporting technical services, such as interfacing with a database or error
logging. These services are usually application-independent and reusable
across several systems
- 7. © Vignesh Saravanan K, AP/CSE
Object Oriented Analysis and Design
RAMCO INSTITUTE OF TECHNOLOGY
7
Development Strategy
Using an iterative development strategy, we are going to proceed
through
requirements,
object-oriented analysis,
design,
and implementation.
- 8. Object Oriented Analysis and Design
V Semester CSE
© Vignesh Saravanan K, AP/CSE
INNOVATIVE TEACHING
Learning through Case Study
- 9. © Vignesh Saravanan K, AP/CSE
Object Oriented Analysis and Design
RAMCO INSTITUTE OF TECHNOLOGY
9
- 10. Object Oriented Analysis and Design
V Semester CSE
© Vignesh Saravanan K, AP/CSE
End of Lecture
• Case Study – Next Gen POS
• Purpose of Use Case Diagrams?
• Use Case Diagram Objects
• How to draw Use Case Diagrams?