SlideShare une entreprise Scribd logo

Introduction to Design Patterns and Singleton

•Télécharger en tant que PPT, PDF•
•
Jonathan Simon
Jonathan Simon

This is Class 1 on a 6 week course I taught on Software Design Patterns. This course provides an introduction into Design Patterns and delves into the Singleton Pattern. Class based on "Head First Design Patterns."

Technologie
1  sur  49
Design Patterns 05/27/10 Week 1 : Introduction and Singleton Jon Simon [email_address]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is a Design Pattern? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Why Study Design Patterns? ,[object Object],[object Object],[object Object],[object Object],05/27/10
History of Design Patterns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
History (continued) ,[object Object],[object Object],[object Object],05/27/10
The Gang of Four ,[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
The Gang of Four: Pattern Catalog 05/27/10 Patterns in red will be discussed in class. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
How Design Patterns Solve Design Problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Reality ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Tangent: Unit Testing ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Unit Testing (cont) ,[object Object],[object Object],[object Object],[object Object],05/27/10
Unit Testing: Final Thoughts ,[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Common Pitfall ,[object Object],[object Object],[object Object],05/27/10
The Book ,[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Example: Logger ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example: Logger (cont) ,[object Object],[object Object],[object Object]
Singleton ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Logger – as a Singleton ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10 Note the parameterless constructor See pg 173 in book
Lazy Instantiation ,[object Object],[object Object],[object Object],05/27/10
Singleton vs. Static Variables ,[object Object],[object Object],[object Object],[object Object],[object Object]
Threading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10 What would happen if two different threads accessed this line at the same time?
Option #1: Simple Locking ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Option #2 – Double-Checked Locking ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],pg 182
Option #2 (C# Example) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Option #3: “Eager” Initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10 ,[object Object],[object Object],Runtime guarantees that this is thread-safe pg 181
Lab #1: Turn a class into a Singleton ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10 Take this class and turn it into a Singleton.
Lab #1 Answer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lab #2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Lab #2 (cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Lab #2 (cont) ,[object Object],05/27/10
Lab #2 (cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Lab #2 (cont) ,[object Object],[object Object],[object Object],05/27/10
Lab #2 Answers ,[object Object],[object Object],[object Object],[object Object],[object Object]
Inheritance Summary ,[object Object],[object Object],[object Object],05/27/10
Add Registry to Singleton ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SingletonRegistry Class ,[object Object],[object Object],[object Object],[object Object]
Case Study: Dependencies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Case Study: Dependencies ,[object Object],[object Object],[object Object]
Case Study: Dependencies ,[object Object],[object Object],[object Object],05/27/10
Unit Testing ,[object Object],[object Object],[object Object],[object Object],05/27/10
Unit Testing ,[object Object],[object Object],[object Object],05/27/10
Scott Densmore “Why Singletons are Evil” ,[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10
Jeremy D. Miller “Chill out on the Singleton…” ,[object Object],[object Object],[object Object],05/27/10
“ How to Decontaminate a Singleton” ,[object Object],[object Object],05/27/10
Comments from Others ,[object Object],[object Object],[object Object],05/27/10
Comments from Others ,[object Object],[object Object],[object Object],05/27/10
Other Useful Articles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SUMMARY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],05/27/10

Recommandé

Singleton Design Pattern - Creation Pattern
Singleton Design Pattern - Creation PatternSingleton Design Pattern - Creation Pattern
Singleton Design Pattern - Creation Pattern
Seerat Malik
 
Singleton Pattern (Sole Object with Global Access)
Singleton Pattern (Sole Object with Global Access)Singleton Pattern (Sole Object with Global Access)
Singleton Pattern (Sole Object with Global Access)
Sameer Rathoud
 
The Singleton Pattern Presentation
The Singleton Pattern PresentationThe Singleton Pattern Presentation
The Singleton Pattern Presentation
JAINIK PATEL
 
Singleton design pattern
Singleton design patternSingleton design pattern
Singleton design pattern
11prasoon
 
Design Pattern - Singleton Pattern
Design Pattern - Singleton PatternDesign Pattern - Singleton Pattern
Design Pattern - Singleton Pattern
Mudasir Qazi
 
Introduction to Design Pattern
Introduction to Design PatternIntroduction to Design Pattern
Introduction to Design Pattern
Sanae BEKKAR
 
Design Patterns - Abstract Factory Pattern
Design Patterns - Abstract Factory PatternDesign Patterns - Abstract Factory Pattern
Design Patterns - Abstract Factory Pattern
Mudasir Qazi
 
Observer Software Design Pattern
Observer Software Design Pattern Observer Software Design Pattern
Observer Software Design Pattern
Nirthika Rajendran
 

Recommandé

Singleton Design Pattern - Creation Pattern
Singleton Design Pattern - Creation PatternSingleton Design Pattern - Creation Pattern
Singleton Design Pattern - Creation Pattern
Seerat Malik
 
Singleton Pattern (Sole Object with Global Access)
Singleton Pattern (Sole Object with Global Access)Singleton Pattern (Sole Object with Global Access)
Singleton Pattern (Sole Object with Global Access)
Sameer Rathoud
 
The Singleton Pattern Presentation
The Singleton Pattern PresentationThe Singleton Pattern Presentation
The Singleton Pattern Presentation
JAINIK PATEL
 
Singleton design pattern
Singleton design patternSingleton design pattern
Singleton design pattern
11prasoon
 
Design Pattern - Singleton Pattern
Design Pattern - Singleton PatternDesign Pattern - Singleton Pattern
Design Pattern - Singleton Pattern
Mudasir Qazi
 
Introduction to Design Pattern
Introduction to Design PatternIntroduction to Design Pattern
Introduction to Design Pattern
Sanae BEKKAR
 
Design Patterns - Abstract Factory Pattern
Design Patterns - Abstract Factory PatternDesign Patterns - Abstract Factory Pattern
Design Patterns - Abstract Factory Pattern
Mudasir Qazi
 
Observer Software Design Pattern
Observer Software Design Pattern Observer Software Design Pattern
Observer Software Design Pattern
Nirthika Rajendran
 
Design Pattern - Factory Method Pattern
Design Pattern - Factory Method PatternDesign Pattern - Factory Method Pattern
Design Pattern - Factory Method Pattern
Mudasir Qazi
 
OO Design and Design Patterns in C++
OO Design and Design Patterns in C++ OO Design and Design Patterns in C++
OO Design and Design Patterns in C++
Ganesh Samarthyam
 
Facade pattern
Facade patternFacade pattern
Facade pattern
JAINIK PATEL
 
Design pattern-presentation
Design pattern-presentationDesign pattern-presentation
Design pattern-presentation
Rana Muhammad Asif
 
Design Patterns
Design PatternsDesign Patterns
Design Patterns
Anuja Arosha
 
Clean architecture
Clean architectureClean architecture
Clean architecture
andbed
 
Design patterns
Design patternsDesign patterns
Design patterns
abhisheksagi
 
Clean architecture
Clean architectureClean architecture
Clean architecture
.NET Crowd
 
Observer design pattern
Observer design patternObserver design pattern
Observer design pattern
Sara Torkey
 
Design patterns ppt
Design patterns pptDesign patterns ppt
Design patterns ppt
Aman Jain
 
Solid principles
Solid principlesSolid principles
Solid principles
Monica Rodrigues
 
Factory Design Pattern
Factory Design PatternFactory Design Pattern
Factory Design Pattern
Jyaasa Technologies
 
Spring Data JPA
Spring Data JPASpring Data JPA
Spring Data JPA
Cheng Ta Yeh
 
DESIGN PATTERNS: Strategy Patterns
DESIGN PATTERNS: Strategy PatternsDESIGN PATTERNS: Strategy Patterns
DESIGN PATTERNS: Strategy Patterns
International Institute of Information Technology (I²IT)
 
Spring Boot
Spring BootSpring Boot
Spring Boot
koppenolski
 
Prototype pattern
Prototype patternPrototype pattern
Prototype pattern
Shakil Ahmed
 
Introduction to design patterns
Introduction to design patternsIntroduction to design patterns
Introduction to design patterns
Amit Kabra
 
Dependency injection - the right way
Dependency injection - the right wayDependency injection - the right way
Dependency injection - the right way
Thibaud Desodt
 
Mocking in Java with Mockito
Mocking in Java with MockitoMocking in Java with Mockito
Mocking in Java with Mockito
Richard Paul
 
Spring Boot in Action
Spring Boot in Action Spring Boot in Action
Spring Boot in Action
Alex Movila
 
Strategy and Template Pattern
Strategy and Template PatternStrategy and Template Pattern
Strategy and Template Pattern
Jonathan Simon
 
MVC and Other Design Patterns
MVC and Other Design PatternsMVC and Other Design Patterns
MVC and Other Design Patterns
Jonathan Simon
 

Contenu connexe

Tendances

Clean architecture
Clean architectureClean architecture
Clean architecture
andbed
 
Observer design pattern
Observer design patternObserver design pattern
Observer design pattern
Sara Torkey
 
Design patterns ppt
Design patterns pptDesign patterns ppt
Design patterns ppt
Aman Jain
 
Dependency injection - the right way
Dependency injection - the right wayDependency injection - the right way
Dependency injection - the right way
Thibaud Desodt
 
Mocking in Java with Mockito
Mocking in Java with MockitoMocking in Java with Mockito
Mocking in Java with Mockito
Richard Paul
 

Tendances (20)

Design Pattern - Factory Method Pattern
Design Pattern - Factory Method PatternDesign Pattern - Factory Method Pattern
Design Pattern - Factory Method Pattern
 
OO Design and Design Patterns in C++
OO Design and Design Patterns in C++ OO Design and Design Patterns in C++
OO Design and Design Patterns in C++
 
Facade pattern
Facade patternFacade pattern
Facade pattern
 
Design pattern-presentation
Design pattern-presentationDesign pattern-presentation
Design pattern-presentation
 
Design Patterns
Design PatternsDesign Patterns
Design Patterns
 
Clean architecture
Clean architectureClean architecture
Clean architecture
 
Design patterns
Design patternsDesign patterns
Design patterns
 
Clean architecture
Clean architectureClean architecture
Clean architecture
 
Observer design pattern
Observer design patternObserver design pattern
Observer design pattern
 
Design patterns ppt
Design patterns pptDesign patterns ppt
Design patterns ppt
 
Solid principles
Solid principlesSolid principles
Solid principles
 
Factory Design Pattern
Factory Design PatternFactory Design Pattern
Factory Design Pattern
 
Spring Data JPA
Spring Data JPASpring Data JPA
Spring Data JPA
 
DESIGN PATTERNS: Strategy Patterns
DESIGN PATTERNS: Strategy PatternsDESIGN PATTERNS: Strategy Patterns
DESIGN PATTERNS: Strategy Patterns
 
Spring Boot
Spring BootSpring Boot
Spring Boot
 
Prototype pattern
Prototype patternPrototype pattern
Prototype pattern
 
Introduction to design patterns
Introduction to design patternsIntroduction to design patterns
Introduction to design patterns
 
Dependency injection - the right way
Dependency injection - the right wayDependency injection - the right way
Dependency injection - the right way
 
Mocking in Java with Mockito
Mocking in Java with MockitoMocking in Java with Mockito
Mocking in Java with Mockito
 
Spring Boot in Action
Spring Boot in Action Spring Boot in Action
Spring Boot in Action
 

En vedette

Design patterns revisited with PHP 5.3
Design patterns revisited with PHP 5.3Design patterns revisited with PHP 5.3
Design patterns revisited with PHP 5.3
Fabien Potencier
 
Structural Design pattern - Adapter
Structural Design pattern - AdapterStructural Design pattern - Adapter
Structural Design pattern - Adapter
Manoj Kumar
 
003 obf600105 gpon ma5608 t basic operation and maintenance v8r15 issue1.02 (...
003 obf600105 gpon ma5608 t basic operation and maintenance v8r15 issue1.02 (...003 obf600105 gpon ma5608 t basic operation and maintenance v8r15 issue1.02 (...
003 obf600105 gpon ma5608 t basic operation and maintenance v8r15 issue1.02 (...
Cavanghetboi Cavangboihet
 

En vedette (20)

Strategy and Template Pattern
Strategy and Template PatternStrategy and Template Pattern
Strategy and Template Pattern
 
MVC and Other Design Patterns
MVC and Other Design PatternsMVC and Other Design Patterns
MVC and Other Design Patterns
 
Factory and Abstract Factory
Factory and Abstract FactoryFactory and Abstract Factory
Factory and Abstract Factory
 
Command and Adapter Pattern
Command and Adapter PatternCommand and Adapter Pattern
Command and Adapter Pattern
 
Observer and Decorator Pattern
Observer and Decorator PatternObserver and Decorator Pattern
Observer and Decorator Pattern
 
Common design patterns in php
Common design patterns in phpCommon design patterns in php
Common design patterns in php
 
Design patterns in PHP - PHP TEAM
Design patterns in PHP - PHP TEAMDesign patterns in PHP - PHP TEAM
Design patterns in PHP - PHP TEAM
 
Your first 5 PHP design patterns - ThatConference 2012
Your first 5 PHP design patterns - ThatConference 2012Your first 5 PHP design patterns - ThatConference 2012
Your first 5 PHP design patterns - ThatConference 2012
 
Introduction to design
Introduction to designIntroduction to design
Introduction to design
 
Singleton Object Management
Singleton Object ManagementSingleton Object Management
Singleton Object Management
 
Design patterns in PHP
Design patterns in PHPDesign patterns in PHP
Design patterns in PHP
 
Design patterns revisited with PHP 5.3
Design patterns revisited with PHP 5.3Design patterns revisited with PHP 5.3
Design patterns revisited with PHP 5.3
 
PATTERNS04 - Structural Design Patterns
PATTERNS04 - Structural Design PatternsPATTERNS04 - Structural Design Patterns
PATTERNS04 - Structural Design Patterns
 
Design pattern (Abstract Factory & Singleton)
Design pattern (Abstract Factory & Singleton)Design pattern (Abstract Factory & Singleton)
Design pattern (Abstract Factory & Singleton)
 
Singleton class in Java
Singleton class in JavaSingleton class in Java
Singleton class in Java
 
Construction Management in Developing Countries, Lecture 8
Construction Management in Developing Countries, Lecture 8Construction Management in Developing Countries, Lecture 8
Construction Management in Developing Countries, Lecture 8
 
Code & Cannoli - Domain Driven Design
Code & Cannoli - Domain Driven DesignCode & Cannoli - Domain Driven Design
Code & Cannoli - Domain Driven Design
 
Domain Driven Design Development Spring Portfolio
Domain Driven Design Development Spring PortfolioDomain Driven Design Development Spring Portfolio
Domain Driven Design Development Spring Portfolio
 
Structural Design pattern - Adapter
Structural Design pattern - AdapterStructural Design pattern - Adapter
Structural Design pattern - Adapter
 
003 obf600105 gpon ma5608 t basic operation and maintenance v8r15 issue1.02 (...
003 obf600105 gpon ma5608 t basic operation and maintenance v8r15 issue1.02 (...003 obf600105 gpon ma5608 t basic operation and maintenance v8r15 issue1.02 (...
003 obf600105 gpon ma5608 t basic operation and maintenance v8r15 issue1.02 (...
 

Similaire à Introduction to Design Patterns and Singleton

Jquery Plugin
Jquery PluginJquery Plugin
Jquery Plugin
Ravi Mone
 
Patterns for the People
Patterns for the PeoplePatterns for the People
Patterns for the People
Kevlin Henney
 

Similaire à Introduction to Design Patterns and Singleton (20)

JavaScript Best Pratices
JavaScript Best PraticesJavaScript Best Pratices
JavaScript Best Pratices
 
Jump start to OOP, OOAD, and Design Pattern
Jump start to OOP, OOAD, and Design PatternJump start to OOP, OOAD, and Design Pattern
Jump start to OOP, OOAD, and Design Pattern
 
Jump Start To Ooad And Design Patterns
Jump Start To Ooad And Design PatternsJump Start To Ooad And Design Patterns
Jump Start To Ooad And Design Patterns
 
Design patterns
Design patternsDesign patterns
Design patterns
 
Design_Patterns_Dr.CM.ppt
Design_Patterns_Dr.CM.pptDesign_Patterns_Dr.CM.ppt
Design_Patterns_Dr.CM.ppt
 
Design patterns in javascript
Design patterns in javascriptDesign patterns in javascript
Design patterns in javascript
 
Most Useful Design Patterns
Most Useful Design PatternsMost Useful Design Patterns
Most Useful Design Patterns
 
Introduction to design_patterns
Introduction to design_patternsIntroduction to design_patterns
Introduction to design_patterns
 
Introduction to Design Patterns
Introduction to Design PatternsIntroduction to Design Patterns
Introduction to Design Patterns
 
Why using finalizers is a bad idea
Why using finalizers is a bad ideaWhy using finalizers is a bad idea
Why using finalizers is a bad idea
 
Creating and destroying objects
Creating and destroying objectsCreating and destroying objects
Creating and destroying objects
 
Ef Poco And Unit Testing
Ef Poco And Unit TestingEf Poco And Unit Testing
Ef Poco And Unit Testing
 
Creational pattern
Creational patternCreational pattern
Creational pattern
 
Design Patterns
Design PatternsDesign Patterns
Design Patterns
 
Design patterns
Design patternsDesign patterns
Design patterns
 
Sda 8
Sda 8Sda 8
Sda 8
 
Javascript Common Design Patterns
Javascript Common Design PatternsJavascript Common Design Patterns
Javascript Common Design Patterns
 
Jquery Plugin
Jquery PluginJquery Plugin
Jquery Plugin
 
What is design pattern
What is design patternWhat is design pattern
What is design pattern
 
Patterns for the People
Patterns for the PeoplePatterns for the People
Patterns for the People
 

Dernier

Strategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
Strategize a Smooth Tenant-to-tenant Migration and Copilot TakeoffStrategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
Strategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
sammart93
 
08448380779 Call Girls In Friends Colony Women Seeking Men
08448380779 Call Girls In Friends Colony Women Seeking Men08448380779 Call Girls In Friends Colony Women Seeking Men
08448380779 Call Girls In Friends Colony Women Seeking Men
Delhi Call girls
 
08448380779 Call Girls In Civil Lines Women Seeking Men
08448380779 Call Girls In Civil Lines Women Seeking Men08448380779 Call Girls In Civil Lines Women Seeking Men
08448380779 Call Girls In Civil Lines Women Seeking Men
Delhi Call girls
 
08448380779 Call Girls In Diplomatic Enclave Women Seeking Men
08448380779 Call Girls In Diplomatic Enclave Women Seeking Men08448380779 Call Girls In Diplomatic Enclave Women Seeking Men
08448380779 Call Girls In Diplomatic Enclave Women Seeking Men
Delhi Call girls
 
The Role of Taxonomy and Ontology in Semantic Layers - Heather Hedden.pdf
The Role of Taxonomy and Ontology in Semantic Layers - Heather Hedden.pdfThe Role of Taxonomy and Ontology in Semantic Layers - Heather Hedden.pdf
The Role of Taxonomy and Ontology in Semantic Layers - Heather Hedden.pdf
Enterprise Knowledge
 
Understanding Discord NSFW Servers A Guide for Responsible Users.pdf
Understanding Discord NSFW Servers A Guide for Responsible Users.pdfUnderstanding Discord NSFW Servers A Guide for Responsible Users.pdf
Understanding Discord NSFW Servers A Guide for Responsible Users.pdf
UK Journal
 
EIS-Webinar-Prompt-Knowledge-Eng-2024-04-08.pptx
EIS-Webinar-Prompt-Knowledge-Eng-2024-04-08.pptxEIS-Webinar-Prompt-Knowledge-Eng-2024-04-08.pptx
EIS-Webinar-Prompt-Knowledge-Eng-2024-04-08.pptx
Earley Information Science
 

Dernier (20)

Strategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
Strategize a Smooth Tenant-to-tenant Migration and Copilot TakeoffStrategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
Strategize a Smooth Tenant-to-tenant Migration and Copilot Takeoff
 
A Domino Admins Adventures (Engage 2024)
A Domino Admins Adventures (Engage 2024)A Domino Admins Adventures (Engage 2024)
A Domino Admins Adventures (Engage 2024)
 
08448380779 Call Girls In Friends Colony Women Seeking Men
08448380779 Call Girls In Friends Colony Women Seeking Men08448380779 Call Girls In Friends Colony Women Seeking Men
08448380779 Call Girls In Friends Colony Women Seeking Men
 
Finology Group – Insurtech Innovation Award 2024
Finology Group – Insurtech Innovation Award 2024Finology Group – Insurtech Innovation Award 2024
Finology Group – Insurtech Innovation Award 2024
 
Axa Assurance Maroc - Insurer Innovation Award 2024
Axa Assurance Maroc - Insurer Innovation Award 2024Axa Assurance Maroc - Insurer Innovation Award 2024
Axa Assurance Maroc - Insurer Innovation Award 2024
 
The 7 Things I Know About Cyber Security After 25 Years | April 2024
The 7 Things I Know About Cyber Security After 25 Years | April 2024The 7 Things I Know About Cyber Security After 25 Years | April 2024
The 7 Things I Know About Cyber Security After 25 Years | April 2024
 
ProductAnonymous-April2024-WinProductDiscovery-MelissaKlemke
ProductAnonymous-April2024-WinProductDiscovery-MelissaKlemkeProductAnonymous-April2024-WinProductDiscovery-MelissaKlemke
ProductAnonymous-April2024-WinProductDiscovery-MelissaKlemke
 
08448380779 Call Girls In Civil Lines Women Seeking Men
08448380779 Call Girls In Civil Lines Women Seeking Men08448380779 Call Girls In Civil Lines Women Seeking Men
08448380779 Call Girls In Civil Lines Women Seeking Men
 
08448380779 Call Girls In Diplomatic Enclave Women Seeking Men
08448380779 Call Girls In Diplomatic Enclave Women Seeking Men08448380779 Call Girls In Diplomatic Enclave Women Seeking Men
08448380779 Call Girls In Diplomatic Enclave Women Seeking Men
 
Presentation on how to chat with PDF using ChatGPT code interpreter
Presentation on how to chat with PDF using ChatGPT code interpreterPresentation on how to chat with PDF using ChatGPT code interpreter
Presentation on how to chat with PDF using ChatGPT code interpreter
 
The Role of Taxonomy and Ontology in Semantic Layers - Heather Hedden.pdf
The Role of Taxonomy and Ontology in Semantic Layers - Heather Hedden.pdfThe Role of Taxonomy and Ontology in Semantic Layers - Heather Hedden.pdf
The Role of Taxonomy and Ontology in Semantic Layers - Heather Hedden.pdf
 
Exploring the Future Potential of AI-Enabled Smartphone Processors
Exploring the Future Potential of AI-Enabled Smartphone ProcessorsExploring the Future Potential of AI-Enabled Smartphone Processors
Exploring the Future Potential of AI-Enabled Smartphone Processors
 
Understanding Discord NSFW Servers A Guide for Responsible Users.pdf
Understanding Discord NSFW Servers A Guide for Responsible Users.pdfUnderstanding Discord NSFW Servers A Guide for Responsible Users.pdf
Understanding Discord NSFW Servers A Guide for Responsible Users.pdf
 
How to convert PDF to text with Nanonets
How to convert PDF to text with NanonetsHow to convert PDF to text with Nanonets
How to convert PDF to text with Nanonets
 
Strategies for Landing an Oracle DBA Job as a Fresher
Strategies for Landing an Oracle DBA Job as a FresherStrategies for Landing an Oracle DBA Job as a Fresher
Strategies for Landing an Oracle DBA Job as a Fresher
 
2024: Domino Containers - The Next Step. News from the Domino Container commu...
2024: Domino Containers - The Next Step. News from the Domino Container commu...2024: Domino Containers - The Next Step. News from the Domino Container commu...
2024: Domino Containers - The Next Step. News from the Domino Container commu...
 
Automating Google Workspace (GWS) & more with Apps Script
Automating Google Workspace (GWS) & more with Apps ScriptAutomating Google Workspace (GWS) & more with Apps Script
Automating Google Workspace (GWS) & more with Apps Script
 
How to Troubleshoot Apps for the Modern Connected Worker
How to Troubleshoot Apps for the Modern Connected WorkerHow to Troubleshoot Apps for the Modern Connected Worker
How to Troubleshoot Apps for the Modern Connected Worker
 
EIS-Webinar-Prompt-Knowledge-Eng-2024-04-08.pptx
EIS-Webinar-Prompt-Knowledge-Eng-2024-04-08.pptxEIS-Webinar-Prompt-Knowledge-Eng-2024-04-08.pptx
EIS-Webinar-Prompt-Knowledge-Eng-2024-04-08.pptx
 
Scaling API-first – The story of a global engineering organization
Scaling API-first – The story of a global engineering organizationScaling API-first – The story of a global engineering organization
Scaling API-first – The story of a global engineering organization
 

Introduction to Design Patterns and Singleton

  • 1. Design Patterns 05/27/10 Week 1 : Introduction and Singleton Jon Simon [email_address]
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18.
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26.
  • 27.
  • 28.
  • 29.
  • 30.
  • 31.
  • 32.
  • 33.
  • 34.
  • 35.
  • 36.
  • 37.
  • 38.
  • 39.
  • 40.
  • 41.
  • 42.
  • 43.
  • 44.
  • 45.
  • 46.
  • 47.
  • 48.
  • 49.

Notes de l'éditeur

  1. 13 November 2008
  2. 13 November 2008
  3. 13 November 2008
  4. 13 November 2008
  5. 13 November 2008
  6. 13 November 2008
  7. 13 November 2008
  8. 13 November 2008
  9. 13 November 2008
  10. 13 November 2008
  11. 13 November 2008
  12. Result : Each thread could create a Singleton. This is a violation of the Singleton pattern!
  13. 13 November 2008
  14. 13 November 2008
  15. 13 November 2008
  16. 13 November 2008
  17. 13 November 2008