BA and Beyond 20 - Geert Haerens - Evolvable Architecture — Are you...

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ba-beyond.eu — #BABeyond20
13 October 2020
Evolvable Architecture
Are you hoping for a miracle, or making it yourself?
Gee...

RESTRICTED INTERNAL SECRET
Evolvable Architecture
Are you hoping for a miracle …or making
it yourself?
Geert Haerens
18/03...

ENGIE March 2020

SYSTEM
BIBO
Bounded Input = Bounded OUTPUT

SoC: Separation of Concern
SoS: Separation of State
DvT: Data Version Transparency
AvT: Action Version Transparency

SoC: Separation of Concern
Concerns are change drivers.
All that can change for different reasons, at different points in ...

SoS: Separation of State
Module take care of their state and make their state visible externally to themselves
Example: er...

DvT: Data Version Transparency
A task working on data structure, must not be impacted by changes in that data
structure
Ex...

AvT: Action Version Transparency
Changing a task in a module must be transparent for all modules calling
this task
Example...

System.out.println(“Hello world.”);
Code Generation
System.out.println(“System.out.println(
“Hello world.”);”);

Invoice
-Nr
-Date
-…
Separating Cross-Cutting Concerns

NS Elements
Conform the most basic function delivered by a computer
Data Element : representing information
Task Element :...

Order
Persistency
Access Control
Remote Access
Invoice Payment
Element Element Element
The Emergence of Elements

Invoice
-Number
-Order
-…
CreateInvoice
Order
-Ref
-Product
-…
SendInvoice
ProcessOrder
Invoice
Element
Order
Element
Crea...

Regeneration & Harvesting
The templates of the Elements will change over time.
You code base needs to be updated → a CE by...

HARVEST
Re-inject

Invoice
-Number
-Order
-…
CreateInvoice
Order
-Ref
-Product
-…
ProcessOrder
SendInvoice
Transaction
Access Control
Code Ex...

Invoice
-Number
-Order
-…
CreateInvoice
Order
-Ref
-Product
-…
ProcessOrder
SendInvoice
Transaction
Access Control
Change ...

Invoice
-Number
-Order
-…
CreateInvoice
Order
-Ref
-Product
-…
ProcessOrder
SendInvoice
Transaction
Access Control
Change ...

Invoice
-Number
-Order
-…
CreateInvoice
Order
-Ref
-Product
-…
ProcessOrder
SendInvoice
Transaction
Access Control
Change ...

Invoice
-Number
-Order
-…
CreateInvoice
Order
-Ref
-Product
-…
ProcessOrder
SendInvoice
Transaction
Access Control
Change ...

Taking a step Back
• Evolvability … in Software
• The necessary conditions for Evolvability (SoC, SoS, DvT, AvT)
• Enforci...

Relevance for BA
• The “inconvenient truth” of software development
• The 4 NS theorems apply to ANY Modular Structure
• R...

Relevance for BA
Agile requires Evolvability.
BY DESIGN.
If not consciously designed ….
BOEM

engie.com
THANK YOU

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