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Introduction to Design Patterns and Singleton

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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."

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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

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Introduction to Design Patterns and Singleton

  • 1. Design Patterns 05/27/10 Week 1 : Introduction and Singleton Jon Simon [email_address]
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Editor's Notes

  1. 13 November 2008
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  12. Result : Each thread could create a Singleton. This is a violation of the Singleton pattern!
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