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Attain Clean Code in Sitecore Solutions using Design Patterns
The document discusses design patterns and how they can be used to attain clean code in Sitecore solutions. It defines what design patterns are, provides a brief history of their development, and gives examples of common patterns like Adapter, Decorator, Composite, and Chain-of-Responsibility. The presentation encourages learning more about design patterns through recommended books and blog posts, and provides contact information for the presenter.
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Attain Clean Code in Sitecore Solutions using Design Patterns
- 1. Attain Clean Codein Sitecore Solutions using Design Patterns Mike Reynolds Hanson Dodge Creative @mike_i_reynolds Sitecore User Group Conference 2015 1
- 2. What’s a DesignPattern? • “General reusable solution to a commonly occurring problem“ • http://en.wikipedia.org/wiki/Software_design_pattern • Describes how to solve a problem • Can be across different contexts • Provides a common language for developers • Is not a cookie-cutter code solution! Sitecore User Group Conference 2015 2
- 3. Design Patterns: History •Proposed by Christopher Alexander (1970s) • A Pattern Language: Towns, Buildings, Construction (http://amzn.to/1BtaaIH) • Kent Beck and Ward Cunningham applied the concept to programming (1987) • Presented results at Object-Oriented Programming, Systems, Languages & Applications (OOPSLA) Sitecore User Group Conference 2015 3
- 4. Design Patterns: History •Gang of Four (GoF) Book (1994) • Design Patterns: Elements of Reusable Object-Oriented Software. (http://amzn.to/UPNN2F) • Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides Sitecore User Group Conference 2015 4
- 5. Design Patterns: Examples •Adapter • Decorator • Composite • Chain-of-responsibility • Null Object Sitecore User Group Conference 2015 5
- 6. Adapter Pattern • Allowsthe interface of an existing class to be used from another • A “wrapper” • Makes existing classes work with others without modifying their source code Sitecore User Group Conference 2015 6
- 7. Adapter Pattern Sitecore UserGroup Conference 2015 7
- 8. Decorator Pattern • Encapsulatesan object with the same interface • Also a “wrapper” • Adds/removes/alters functionality on the inner instance Sitecore User Group Conference 2015 8
- 9. Decorator Pattern Sitecore UserGroup Conference 2015 9
- 10. Composite Pattern • Encapsulatesa collection of objects with the same interface • Treats the entire collection as one object Sitecore User Group Conference 2015 10
- 11. Composite Pattern Sitecore UserGroup Conference 2015 11
- 12. Chain-of-responsibility Pattern • Composedof command objects and a series of processing objects • Each processing object executes specific command objects • Processing objects are chained together • think linked list • Processing objects are invoked in a cascading manner Sitecore User Group Conference 2015 12
- 13. Null Object Pattern •Represents the “null” state of an object • Provides methods with no behaviour • Removes the need of client code performing null checks Sitecore User Group Conference 2015 13
- 14. Learn More! • RecommendBooks • http://amzn.to/UPNN2F • http://amzn.to/1ppJHeH • http://amzn.to/1EZEa3z • http://amzn.to/1bSAYsh • Blog posts • http://bit.ly/1E7J7JO Sitecore User Group Conference 2015 14
- 15. Get In Touch! Blog:http://sitecorejunkie.com Twitter: @mike_i_reynolds LinkedIn: http://linkd.in/1Csu1N8 Sitecore User Group Conference 2015 15
- 16. Questions? Sitecore User GroupConference 2015 16
- 17. Thank you Sitecore UserGroup Conference 2015 17