Light Weight Architecture: the way of the future?

Transcription

1 by Gerrit Muller University of South-Eastern Norway-NISE Abstract The question : What is an architecture is addressed. Trends in the customer world and in the technology are used to obtain an outline of the product requirements. The customer world itself is a value chain consisting of quite heterogeneous stakeholders. To satisfy the needs of these customers an integral approach is required. Architectures play a key role in such an integral approach. Architecture lessons from practice are given to illustrate criteria for a good architecture are discussed. The concept of architecture-weight is introduced. overall = Flexibility * Manageability effectiveness Distribution Effectiveness Flexibility Manageability This article or presentation is written as part of the Gaudí project. The Gaudí project philosophy is to improve by obtaining frequent feedback. Frequent feedback is pursued by an open creation process. This document is published as intermediate or nearly mature version to get feedback. Further distribution is allowed as long as the document remains complete and unchanged. status: finished very low low medium high architecture (for dynamic markets and fast changing technologies) weight

2 What is Architecture? Understanding Why Describing What Guiding How Do the right things Do the things right 2 Gerrit Muller LWAwhatIsArchitecture

3 Table of Contents 1A. Do the right things; The Dynamic Market Understanding Describing Guiding Why What How 1B. Do the things right; Lessons from Practice On/Off 25 Kg This appliance may only be used for non commercial use accuracy +/- 200 g 2. The Weight of an Architecture; Architectural Chaos or Bureaucratic Control? 3 Gerrit Muller LWAtableOfContents

4 Part 1A: Do the right things; The Dynamic Market 4 Gerrit Muller

5 Value chain Waterreus Heijn Gore Gandhi Sharon Hoessein van Bommel Reinders Smith Rooyakkers van Oranje Bakker der Kinderen Obbink Pietersen Neeskens Nistelrooij Bush Charite Meulengraaf van Hanegem v.d. Hamer Consumers Boonstra Blair Clinton v.d. Meulen Schijvens Jones Koch Peper Prodi Pinochet Kleisterlee Kok Cruijf Leonardo Chirac El Khatabi v.d. Spijker Peters de Gruijter Jansen de Vries Schweitzer d'oliviera Muller Goedkoop Schroder Fry's It's Retailers Dixon Canal+ UPC AOL Providers AT&T Philips CE-TV Intel Microsoft Sony System Integrators Loewe Philips Components Nokia Philips CE-DN Philips CE-PCC Component and Platform Suppliers Micron Philips Semiconductors Liberate ST LG TI Samsung 5 Gerrit Muller LWAvalueChain

6 Convergence Telecom Computer Consumer 6 Gerrit Muller LWAconvergence

7 Integration and Diversity phone firewall dvd audio microset pda watch sailboat surveillance camera cable modem set top box headphone pen garment car camera speech mp3 television car navigation computer games flat display Communicator Ambient Intelligence living room 7 Gerrit Muller LWAintegrationAndDiversity

8 Uncertainty (Dot.Com effect) AOL Amazon.com source: BigChart.com dd march 19, Gerrit Muller LWAdotcom

9 Moore s law From: COPA tutorial, Rob van Ommering 1 kb Moore's law MB 64 kb 9 Gerrit Muller LWAmooresLawRvO

10 System Integrator Problem Space - Business months units manyear 100 infrastructure 10 6 TV 1000 digital TV personalized 100 (skins, themes) application time to market volume effort 10 Gerrit Muller LWAproblemSpaceBusiness

11 System Integrator Problem Space - Technology Operations/s Watt Byte home server digital TV home server digital TV home server digital TV performance power storage 11 Gerrit Muller LWAproblemSpaceTechnology

12 System profile Problem space months units manyear Operations/s Watt Byte infrastructure TV 1000 digital TV home server home digital TV server digital TV home server application 100 personalized (skins, themes) digital TV storage power performance effort volume time to market 12 Gerrit Muller LWAsystemProfile

13 PS Technology solutions Operations/s Watt TCP/IP home server digital TV performance 10 3 home server power digital TV MIPS TriMedia Motion detector psos WinCE ARM MPEG decoder Real Bluetooth USB RF amp MP3 WAP GPS 13 Gerrit Muller LWAsolutionSpaceTechnology

14 Partial Solution: Configurable Component Platform Technologies Systems MIPS TriMedia MPEG decoder ARM Real RF amp Bluetooth TCP/IP MP3 psos WinCE 1394 GPS watch communicator digital TV set top box pda camcorder required optional 14 Gerrit Muller LWAsystemTechnologyMap

15 Exploring problem space and solution ingredients Problem space months units infrastructure TV digital TV 10 3 application 1 manyear 100 personalized (skins, themes) 10 Operations/s home server home digital TV server Watt digital TV home server Byte digital TV Technologies Systems watch communicator digital TV set top box pda camcorder MIPS TriMedia MPEG decoder ARM Real RF amp Bluetooth TCP/IP MP3 psos WinCE 1394 GPS time to market volume Programmability, flexibility effort performance Increase supplier content power storage Competitive Performance / cost / power Solution ingredients Composable Architecture required optional Family of products Configurability 15 Gerrit Muller LWAfromStakeholderToQualities

16 More than Architecture B Business A Architecture P Process O Organization From: COPA tutorial; Philips SW conference Architecture only works if the complementary viewpoints are addressed consistently 16 Gerrit Muller LWAbapoFramework

17 Conclusions Part 1A Understanding Why Describing What Dynamic Market Convergence Integration Diversity Configurable Component Platform Portfolio and Family architecture 17 Gerrit Muller LWAconclusionsPart1

18 Part 1B: Do the things right; Lessons from Practice 18 Gerrit Muller

19 Guiding How by providing rules for: 1. Functional Decomposition acquisition compress encoding display decompress decoding storage Pipeline 3. Allocation 2. Construction Decomposition view play browse audio video TXT tuner drivers scheduler OS Performance MPEG etc. DS P networking CPU Resource usage RAM 4. Infrastructure framebuffer filesystem etc Exception handling Device abstraction 5. Choice of integrating concepts 19 Gerrit Muller LWAarchitectureHow

20 The Art of Architecting Stakeholders Expectations Facts Architecture(s) problems, legacy analyze assess balance trade-off decide Architecting vision overview insight understanding Architecture uncertainties unknowns Facts, Expectations and Intuition may be false Integration requires a critical mindset that is alert for unknowns Architect(s) Intuition, assumptions, beliefs, bias 20 Gerrit Muller LWAarchitecting

21 Architecting is much more than Decomposition Decomposition is "easy" Integration is difficult 21 Gerrit Muller LWAdecompositionAndIntegration

22 Myth: Platforms are Stable Dynamic Market How stable is a platform or an architecture? Architecture Components Platform Fast changing Technology 22 Gerrit Muller LWAplatformStability

23 The first time right? person years First time right? maybe unlikely miracle impossible 23 Gerrit Muller LWAfirstTimeRight

24 Feedback stepsize: elapsed time: 3 months 25 months Target Start 24 Gerrit Muller LWAfeedbackLarge

25 Feedback (2) stepsize: elapsed time 3 months 25 months Target 2 months 12 months Target Start Start 25 Gerrit Muller LWAfeedbackMedium

26 Feedback (3) stepsize: elapsed time 3 months 25 months 2 months 12 months 1 month 8 months Target Target Target Start Start Start Small feedback cycles result in Faster Time to Market 26 Gerrit Muller LWAfeedbackSmall

27 Platform Evolution (Easyvision ) Last changed in: Growth Change rd generation components are mature, active maintenance needed. Growth and change continues, some "old" components become obsolete 27 Gerrit Muller LWAplatformEvolution

28 Part 2: The Weight of an Architecture; Architectural Chaos or Bureaucratic Control? 28 Gerrit Muller

29 Architecture Weight weight(architecture) = all rules weight(rule) On/Off Rule Rule 1 Rule Kg Rule Rule 1 1Rule Rule 1 n weight (rule) = f ( level of enforcement, scope (impact), size, guideline component single-line conditional rule product multi-line mandatory rule portfolio multi-page level of coupling or number of dependencies ) stand-alone builds on many rules low weight high 29 Gerrit Muller LWAarchitectureWeight

30 Scope and Impact Business or Portfolio n m Product Family n Heavy-weight High impact Large scope m Product n m Subsystem n m Component Small scope Low impact Light-weight 30 Gerrit Muller LWAarchitectureScope

31 Criteria for an Architecture Customer being informed functionality performance timely available acceptable cost Feedback Responsiveness Business manager bottomline future growth Open Architecture Evolution implementation decoupling solution freedom Suppliers Solution Freedom Communicable guidance understandability accessibility product feasibility Engineers 31 Gerrit Muller LWAstakeholdersArchitecture

32 Weight versus Effectiveness Effectiveness Flexibility Evolution Responsiveness Maintenance Manageability Integration Interoperability Providing control very low low medium high for dynamic markets and fast changing technologies architecture weight 32 Gerrit Muller LWAeffectivenessCurves

33 Conclusion Part 2 overall = Flexibility * Manageability effectiveness Effectiveness Flexibility Manageability very low low medium high (for dynamic markets and fast changing technologies) architecture weight 33 Gerrit Muller LWAeffectiveness

34 Light Weight How -To weight(architecture) = all rules weight(rule) 2. Minimize the weight per rule 1. Reduce the rule set to the (business) essential Understand your customer your customer's customer etcetera 34 Gerrit Muller LWAlightWeightHow

35 Minimize Rule Weight weight(rule)= minimize number of mandatory rules f ( level of enforcement, empower, delegate scope (impact), minimize implementation details focus on essential concepts size, level of coupling or number of dependencies ) Apply design principles on architecture Multi-view architecting 35 Gerrit Muller LWAlightWeightRuleHow

36 Summary 1A. Dynamic Market: Understand Your Problem space Customer months application time to market units 106 infrastructure TV volume manyear 1000 digital TV 100 personalized (skins, themes) 10 effort Operations/s home server performance home digital TV server Watt power digital TVhome Byte 1012 server storage digital TV Change Growth 1B. Architecting in Practice: Change is normal, Stability is the exception 2. Optimal architecture: Light weight! overall effectiveness Effectiveness very low low medium high architecture weight 36 Gerrit Muller LWAsummary

37 Acknowledgements This presentation has been enabled by the inspiring and critical comments of: Jürgen Müller Peter van den Hamer Lex Heerink 37 Gerrit Muller