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The Fluent Interface Pattern

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  • 1. The Fluent Interface PatternLars-Erik KindbladSenior ConsultantBlog: kindblad.com
  • 2. A common problem in most software projects Technical debts increases over time and the code gets harder and harder to maintain and add features to | Sector, Alliance, Offering
  • 3. Feature delivery for most projects Technical debt Complex and messy code Code and logic is duplicated No common coding standardFeatures Delivered No strict architecture ++ Time | Sector, Alliance, Offering
  • 4. Ideal Feature DeliveryFeatures Delivered Time | Sector, Alliance, Offering
  • 5. How to reach ideal delivery? Software development is complex Not a single solution but a mix of many different things • Write a lot of code • Important to understand the business model • Readable & maintainable code over fancy code • Simplicity over complexity • Decide on a common coding standard • Reuse code instead of code duplication • Create a project framework with common code and logic • Design Patterns – follow generic solutions to commonly occurring problems o 100s of design patterns exists – Factory Pattern, MVC Pattern, Command Pattern, Fluent Interface Pattern etc. • ++ | Sector, Alliance, Offering
  • 6. The Fluent Interface Pattern One of many design patterns that can contribute to a better code base Fluent Interfaces makes the code easier to read and easier to use due to a simpler API that requires less code Consists of 2 principles: • Method chaining - Traditional code requires one line per command, method chaining allows multiple commands per line • More readable API – The code can be read like a sentence. Optional as it requires more typing due to longer names and more code to write Popular to use in frameworks: Moq, Fluent Nhibernate, FluentData etc. | Sector, Alliance, Offering
  • 7. Example – Find a personTraditional Code:Fluent Interface Code:Or: | Sector, Alliance, Offering
  • 8. A more readable Fluent InterfaceOr: | Sector, Alliance, Offering
  • 9. Designing Fluent Interfaces - Method vs. Property Use a method when having to accept one or more values Use a property when not having to accept any values Use a method to finish the call | Sector, Alliance, Offering
  • 10. Traditional Code | Sector, Alliance, Offering
  • 11. Fluent Interface Code | Sector, Alliance, Offering
  • 12. Example #2 – A List of PersonsTraditional Code:Fluent Code: | Sector, Alliance, Offering
  • 13. Traditional Code | Sector, Alliance, Offering
  • 14. Fluent Interface Step 1: Add Gateway Pattern | Sector, Alliance, Offering
  • 15. Step 2: Add Fluent Interface Pattern | Sector, Alliance, Offering
  • 16. Examples from other FrameworksMoq:FluentData: | Sector, Alliance, Offering
  • 17. When to use Fluent Interfaces Anywhere where it makes the code easier to read and easier to use Typically in methods that are often invoked Together with the Gateway Pattern to hide complex 3rd party code or legacy code Frameworks | Sector, Alliance, Offering
  • 18. QUESTIONS? | Sector, Alliance, Offering
  • 19. www.capgemini.comThe information contained in this presentation is proprietary. ©2010 Capgemini. All rights reserved