Working with Design Patterns: Observer

Introducing my own custom callback interface can significantly improve readability when I have more complex callback needs.

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observer.jpg Implementation of the observer pattern.

Reference

[Gamma] Gamma, E., et. al. Design Patterns: Elements of Reusable Object-Oriented Software. Addison-Wesley Professional, 1995.

About the Author

Jeff Langr is a veteran software developer celebrating his 25th year of professional software development. He's authored two books and dozens of published articles on software development, including Agile Java: Crafting Code With Test-Driven Development (Prentice Hall) in 2005. You can find out more about Jeff at his site, http://langrsoft.com, or you can contact him via email at jeff at langrsoft.com.

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This article was originally published on August 17, 2007