Image result for design pattern in software engineering In software engineering, a software design pattern is a general, reusable solution of how to solve a common problem when designing an application or system. Unlike a library or framework, which can be inserted and used right away, a design pattern is more of a template to approach the problem at hand.

1. Design Pattern
Md. Rakib Trofder
Roll: BSSE 1129

2. Analytical
Heirarchy Process
Subcriteria’s are:
 Type [Uponnash, SciFi, Religion]
Borrow [Low, Low Medium, High Medium,
High]
Time [Latest, Recently New, Recently Old,
Old, Oldest]
Calculate Criteria and Subcriteria
Criteria’s are:
1. Type Criteria
2. Borrow Criteria
3. Time Criteria
2

3. Identify Code Smell
(Switch Case)
3

4. Solved using Pattern Matcher
4

5. Identify Code Smell (Long
Method)
5

6. Reduce method length
6
Previous Line Count: 60
Current Line Count: 20

7. Identify Code Smell
(Duplicate Code)
7
Similar Types of Functionality for
Count Criteria, Type Criteria and
Time Criteria AHP Methods

8. Make a method for
all similar methods
8

9. Make all the parameters private
instead of private in Data class
9

10. Use getter and setter instead of direct
variable use
10

11. Implement Strategy
Pattern
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12. Implement Signleton
Pattern
12

13. Statistical Overview
13
• 1000+ lines
of code
• There are total 9
classes (2 data
classes)
• Implement 2
Design Pattern
• Remove Major
Code Smells

14. Thank
You
14