FROM COMPILER SWITCHES TO STRATEGIC REUSE · Tightly coupled system drives Integration- and Process...



ABOUT ME

• Systems Architect and Development Manager

• 20+ years experience of Product Development

• Consultant, Development Manager, Product Manager

• Telecom, Automotive, ERP, Aerospace&Defence

• 4 in a row @Devlin

2

Pär Hammarström SAAB Aeronautics

[email protected]

073 418 0173



SOFTWARE AT WORK

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SOFTWARE PRODUCT LINES

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http://www.google.se/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCNmYqfXPo8cCFQOXcgodtNoDSQ&url=http://techdistrict.kirkk.com/2010/03/04/architecture-lives-here/&ei=pEbLVdm2GYOuygO0tY_IBA&bvm=bv.99804247,d.bGQ&psig=AFQjCNErnrW9CrYHel2WL5Xfm9CQHvj9pw&ust=1439471624513048



http://www.google.se/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCN3Q5_7Oo8cCFUTDcgodu3cAGA&url=http://www.mdpi.com/1424-8220/13/9/11362&ei=q0XLVZ3PNcSGywO774HAAQ&bvm=bv.99804247,d.bGQ&psig=AFQjCNEtCBSa-TQA02NwUqe2e3_0SRRWoA&ust=1439471290602757



#ifdef



#include <stdio.h> int main() { #ifdef PRODUCT_A char foo[] = “Welcome"; #else char foo[] = "Hello"; #endif /* PRODUCT_A */ #ifdef PRODUCT_B char foo[] = “Beautiful"; #endif /* PRODUCT_B */ #ifdef PRODUCT_C char foo[] = “Grey"; #endif /* PRODUCT_C */ #ifdef PRODUCT_D char foo[] = “Goodbye"; #endif /* PRODUCT_D */ char bar[] = "World!"; printf("%s %s\n", foo, bar); return 0; }



Explore

Variability & Commonality to achieve

Economy of Scale

STRATEGIC REUSE



SOFTWARE PRODUCT LINES

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COMMONALITY & VARIABILITY

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HOW MANY COMBINATIONS?

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HOW MANY COMBINATIONS?

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VERIFICATION HELL?

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VARIABILITY * COUPLING = COMPLEXITY

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BIG BALL OF MUD

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• Conway’s Law

‒ "organizations which design systems ... are constrained to produce designs which are copies of the communication structures of these organizations“

• Leads to Cohesion principle

‒ ”my module is where I put my code”

HMI

Services

HW abstraction



EXAMPLE

Equipment

Equipment

controller

Gateway

Consumer (1)

Consumer (2)

Producer (3)

HMI

(screen)

HMI

(framework 1)

HMI

(framework 2)

HMI

(framework 3)

Producer

Functional

Monitoring

CBIT

Time

Server



STATE OF THE INDUSTRY?

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START WITH THE BUSINESS

Problem Space Solution Space

Domain

Engineering

Application

Engineering

Specification of the

configuration

Variablity definition from

a customer point of view

Items and parameters

Structure and rules

(Variation Points &

Variability Guide)



ARCHITECTURE IS KEY

Tightly coupled system drives Integration- and Process centric Approach

‒More or less centralized synchronization of design

‒Dealing with ripple effects

Loosely coupled system enables Composition and Architecture centric Approach

‒Architecture for composition and eco-systems

‒Backward compability



CORE PROBLEM – UNDERSTAND YOUR VARIABILITY

• Essential

‒ Inherent in the problem domain

‒ Differentiation is competitive advantage

• Accidental

‒ Technical debt

‒ Organization



DECOUPLING STRATEGY

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PATTERN – FACTORY (DDD)

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PATTERN – MODULE SPLIT

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PATTERN – SELF CONTAINMENT

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PATTERN – PARAMETERS

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TREND: BUILD TIME -> RUN TIME

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ORGANIZATIONAL DECOUPLING

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May June July August September

Project X

R 1

Project Y

Project Z

Platform R 2

Sprint 1 Sprint 2 Sprint 3 Sprint 4 Sprint 5 Sprint 6 Sprint 7 Sprint 8 Sprint 9 Sprint 10

R 2 Proposal R 2 Freeze

R 2 Prestudy

System Test

Certification

Platform update

Design Review



QUESTIONS?

FROM COMPILER SWITCHES TO STRATEGIC REUSE · Tightly coupled system drives Integration- and Process...

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