Software Architecture and Design - An Overview
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about “Software Architecture and Design” what it is, what it isn’t giving a basic idea about the terms detailed comments and annotations for each slide can be found here: https://docs.google.com/presentation/d/1U8zNQ5YQ2562yQzotVQ5cLxsPKu44lD3_L9jdSPKk4g/edit?usp=sharing
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Software Architecture and Design - An Overview
- 1. Software Architecture and Design An Overview Lorem Dolor Ipsum
- 2. Oliver Stadie Software Engineer • Generalist IT Consulting • Game Developer waog.net
- 3. Content ● Popular examples ● Context ● Architecture vs. Design ● Uses ● Aspects
- 4. Popular Examples Stuff you may know
- 6. Popular Examples: Layer Network Access Layer Internet Layer Transport Layer Application Layer
- 7. Popular Examples: MVC Model View Controller
- 10. Context When is it used?
- 11. Context: Waterfall Analysis / Requirements Architecture & Design Implementation / Code ...
- 12. Iteration 3: Development Iteration 2: Development Context: Agile Iteration 0: Envisioning Initial Requirements Envisioning Initial Architectural Envisioning Iteration 1: Development Iteration Modeling Model Storming Test Driven DevelopmentReviews agilemodeling.com
- 13. Architecture vs. Design Whats the difference?
- 14. Architecture vs. Design ● often subjective ● different definitions ● fuzzy boundary ● both are kinds of Models / Modelling
- 15. Architecture vs. Design - Granularity
- 16. Architecture vs. Design - Question Where? How? What?
- 17. Architecture vs. Design - Question Where? How? What?
- 18. Architecture vs. Design - Question Where? How? What?
- 19. Architecture vs. Design - Examples ● What kind of data storage? ● How do modules interact with each other? ● What recovery systems are in place? ● What are the responsibilities of module X? ● What are the functions of class Y? ● What can a class do, and what not?
- 20. Architecture vs. Design - Conclusion ● hairsplitting → don’t bother ● all are ambiguous → attach “Software” ModelArchitecture Design
- 22. Uses: Sketch vs. CASE
- 23. Use: Communication (1) var __extends = this.__extends || function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; function __() { this.constructor = d; } __.prototype = b.prototype; d.prototype = new __(); };
- 25. Use: Planning
- 26. Use: Understanding ● simplification ● information hiding ● easy trial-and-error ● 2d information
- 27. Use: Documentation (1) /** =========================== * This class uses class B * It also uses class C * It extends class D, through * which it is used by class E * =========================== */
- 29. Use: Model Driven Development
- 33. Aspects: Structure of A ‘n’ D Patterns Frameworks, Libraries, Technologies Common Sense, EXP Principles Your Application Anti-Pattern Best Practices
- 34. Aspects: A ‘n’ D Philosophy Legals Processes & Workflows … ? Requirements Standards Social Notations Tools
- 35. Thx!
- 36. Reuse & Licence ● You may reuse & change it non-commercially. ● You have to contact and inform me about any changes or re-publications. ● The “Oliver Stadie” and “Reuse & Licence” pages have to remain unchanged. ● Anything else is like in this creative commons: Software Architecture and Design - An Overview by Oliver Stadie is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Editor's Notes
- about “Software Architecture and Design” what it is, what it isn’t giving a basic idea about the terms
- Generalist -> passion for AnD, since it’s the intersections of all technologies Currently Finishing my studies in informatics Freelancer
- responsibility separation: Request - Response
- TCP/IP alias internet protocol suite stack layers and restrict communication channels
- Split a system into 3 main components. What the user sees What is done (activities) What is stored
- restrict the instances of a class to one by far the most popular pattern on SO often used badly
- A.k.a.: (Event-)Listener, Publish/Subscribe, Dependents defines one-to-many dependency
- Something like a definition follows...
- Waterfall is outdated approach, but makes boundaries and duties clear Based on requirements Independent from Code
- Agile Modelling Approach Modelling == Creating Design / Architecture (another word) More complex integration
- I used best rated answers from stackoverflow, to present a “common opinion”
- Architecture: design of the entire system skeleton highest level of abstraction Design: design individual module / component / class can be directly translated to programming language, unlike architecture. Overall: different diagram types
- Differentiation by question type.
- Example Questions use these words anyway! “How” could be reformulated to “What Protocol”. Can’t reformulate “What”.
- Model can be confused with M in MVC Design can be confused with Graphic Design etc. Architecture can be confused with Building Architecture. Just say “Software Architecture”, “Software Design” or “software Modelling”
- What are the use cases and applications of AnD? What are the benefits of AnD?
- CASE == Computer aided software engineering fast vs. digital disposable vs. reusable
- It can be hard to understand software details
- AnD provides an own language only few people speak it
- AnD provides mechanisms to plan SW before expensively implementing it. E.g. as everybody knows, it’s hard to build a Dalek without proper planning.
- AnD helps understand problems and software simplification & information hiding: focus on interesting aspects. easy trial-and-error: it’s much easier and quicker to slightly change a diagram, than 100 LOCs
- AnD can be used to document code and SW. classical code documentation can be bulky ...
- … while diagrams can supplement documentation in a cleaner way.
- generate working SW or code snippets from model may save a lot of work Requires CASE instead of sketches
- generate accurate models from code help understand, communicate and plan again
- It’s easy to equip one soldier but thousands need additional coordination. Same is true for Software: 1 Library vs. 100; 100 LOC vs. 1.000.000 Two issues: Clean & Scaling Scaling: minimize additional coordination Clean: ease work (understanding, time, etc.)
- What are the subtopics of AnD?
- principles: SOLID patterns: GoF frameworks & libraries: often enforce a certain design technologies: have to be considered when designing common sense, exp: most of all intuition. Very important point, since there is no right or wrong. application: the thing you want to build. anti-pattern: examples of how you shouldn’t do it. best practices: examples of how to do it.
- legals: are there patents for AnD? Philosophy: How important is AnD? Notations: How to draw our ideas? -> UML Processes & Workflows: remember waterfall and agile Standards: UML, common sense Tools: CASE, MDD, etc. Social: Had good intuition 5 years ago, but nobody listened. Learned buzzwords and anti-patterns. Now bosses are impressed and listen. something I forgot?