Kevlin Henney

Kevlin Henney

twitter-icon @KevlinHenney

Biography

Kevlin Henney is an independent consultant, speaker, writer and trainer. His development interests are in patterns, programming, practice and process. He has been a columnist for a number of magazines and sites, has contributed to both open- and closed-source software, and has been on far too many committees (it has been said that ”a committee is a cul-de-sac down which ideas are lured and then quietly strangled”). He is co-author of A Pattern Language for Distributed Computing and On Patterns and Pattern Languages, two volumes in the Pattern-Oriented Software Architecture series. He is also editor of 97 Things Every Programmer Should Know. Kevlin lives in Bristol and online.

Session: SOLID Deconstruction

The SOLID principles are often presented as being core to good code design practice. Each of S, O, L, I and D do not, however, necessarily mean what programmers expect they mean or are taught. By understanding this range of beliefs we can learn more about practices for objects, components and interfaces than just S, O, L, I and D.

This talk reviews the SOLID principles and reveals contradictions and different interpretations. It is through paradoxes and surprises we often gain insights. We will leave SOLID somewhat more fluid, but having learnt from them more than expected.

Workshop: Paradigms Lost, Paradigms Regained: Programming with Objects and Functions and More

It is very easy to get stuck in one way of doing things. This is as true of programming as it is of life. Although a programming paradigm represents a set of stylistic choices, it is much more than this: a paradigm also represents a way of thinking. Having only way to think about problems is too limiting. A programming paradigm represents a set of patterns of problem framing and solving and contains the ingredients of software architecture. As Émile Auguste Chartier noted, there is nothing more dangerous than an idea when you have only one idea.

Perhaps even more problematic than being stuck with a narrow view of paradigms, is being stuck with a dysfunctional view of each paradigm. For instance, many developers working in languages and frameworks that support object orientation lack a strong idea of the principles of interaction, data abstraction and granularity that support an effective view of OO, and instead surround themselves with manager objects, singletons and DTOs.

During the day we will explore the strengths and weaknesses of different programming styles, patterns, paradigms, languages, etc., with examples and opportunity for discussion.

Notes: This is a lecture-based day, but with plenty of opportunity for questions and discussion.

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