Understanding Design Patterns: Solutions, Discovery, and Anti-Patterns in Software Development
Design Patterns are proven solutions to recurring problems in software development, identified and cataloged by the developer community. They provide a common language for developers to discuss and apply similar solutions across various contexts. Each pattern is defined by its intent, motivation, applicability, structure, consequences, and sample usage. However, not all patterns are beneficial. Anti-Patterns highlight what to avoid by detailing bad practices and suggesting better alternatives. Practical experience and reflection on existing patterns are essential for discovering new patterns and contributing to the community.
Understanding Design Patterns: Solutions, Discovery, and Anti-Patterns in Software Development
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Presentation Transcript
Summary SE-2811 Dr. Mark L. Hornick
What is a Design Pattern? A Design Pattern is a solution to a problem in a context, where • The context is the situation in which the pattern is applied, where such situations are encountered repeatedly • The solution is a general design that can be applied with small modifications to similar contexts SE-2811 Dr. Mark L. Hornick
Design Patterns emerge from the software development community There is no central organization that invents Design Patterns • Patterns are “discovered” by software developers that recognize similarities in solutions applied in different contexts • experience helps • Patterns are “popularized” by software developers cataloging these solutions • Creating a common language that can be used in the development community SE-2811 Dr. Mark L. Hornick
Design Patterns are categorized by formally describing their characteristics The “Pattern Community” has evolved a de-facto template outlining a Pattern’s • Intent • Motivation • Applicability • Structure • Consequences • Sample usage • …. SE-2811 Dr. Mark L. Hornick
You can “discover” patterns too Practical experience is vital • Learn all you can about existing patterns • Write lots of applications • Reflect on your experiences • If you have a big idea, contribute it • See if your idea becomes accepted SE-2811 Dr. Mark L. Hornick
Not all “Patterns” are beneficial Anti-Patterns tell you what to avoid in creating a solution to a problem • More negative consequences than positive benefits • Particular bad practices • Alternate, better approaches are suggested along with the description of the bad pattern’s aspects SE-2811 Dr. Mark L. Hornick
