A talk regarding the first 2 principles of SOLID - Single Responsibility Principle and Open Closed Principle.

1. SOLID Principles for Software Architects aka No More Spaghetti Code

3. Web Dev (ASP, PHP)

4. Application Lifecycle Management (TFS)

5. Technical Training

6. Blog: rixbits.blogspot.com

8. S ingle Responsibility Principle O pen / Close Principle L iskov Substitution Principle I nterface Segregation Principle D ependency Inversion Principle

9. avoid Code Rot

10. How can we tell when our code is rotting?

11. Rigidity Design is hard to change

12. Fragility Design is easy to break

13. Immobility Design is hard to reuse

14. Viscosity Design makes it hard to do the right thing

16. Definition “Every object should have a single responsibility, and that responsibility should be entirely encapsulated by the class.” “Classes should have one responsibility - one reason to change.”

18. Example

21. Arguments against SRP?

22. Argument Against SRP “Too many classes and too difficult to understand the BIG PICTURE.” There are no more moving parts in a system with many small pieces than that with a few large pieces. The benefits outweigh this argument. Consistency, good names, and documentation make this a mute point.

23. What are some of the benefits? Reuse - If all your classes follow the srp, you are more likely to reuse some of them Clarity - Your code is cleaner as your classes don’t do unexpected things Naming - As all your classes have a single responsibility, choosing a good name is easy Readability - Due to the clarity, better names and shorter files the readability is improved greatly.

24. SIDEBAR Workflows: 1 per content type Vs 1 workflow to rule them all

26. A module should be opentoextensibility,butclosedfor modification.

28. Example

29. Bad Good

30. Challenges with using OCP?

31. Challenges: Expensive – requires significant effort Experience – best judgement Research – ask the right questions

32. SIDEBAR Content type inheritance

33. Learn More: Google or Bing “Robert C. Martin” Search for a podcast with Scot Hanselman and Uncle Bob rwilkins@iccohio.com

34. Questions/Comments?