Application Of Software Design Pattern
- 1. Application of Software Design Pattern Presented By Prosunjit Biswas System Developer Cention AB. Email:prosun.csedu@gmail.com
- 2. Outline Uses of Observer Pattern Uses of Factory Pattern Uses of Singleton pattern How D.P Helps development
- 3. Observer Pattern One Server / Subject One/many clients / observers Client can subscribe anytime Client can de-subscribe anytime Server updates client as soon as it has an update
- 4. Observer Patten in use I want my customers always get updated with my products RSS Feed We add a feed in our feed reader and when RSS feed has an update, it appear in our reader automatically Implementing news server
- 5. Factory Pattern Factory pattern helps to create an object an creation time of a common subclass.
- 6. Factory Pattern in Use Avoiding the nested if … else … block to create object on condition. To create random shapes ( box ,circle , square , … ) in paint program. To load different database tables on demand from user input
- 7. Singleton Pattern Singleton helps to access an non sharable resource in a disciplined manner Only one ( or fixed number ) object of a class (resource)
- 8. Singleton in Use Creating single database connection object Creation of non sharable code igniter base class Creation of non sharable JQuery base Class
- 9. How Design Pattern Helps Development DP show us how to build systems with good OO design qualities. Patterns are proven OO experiences. Pattern helps modularization Pattern provides a shared vocabulary. It increases development time by faster communication