Next Generation POS application in OOAD

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?