THE WHYS AND HOWS Rebecca Parsons Chief Technology Officer - PowerPoint PPT Presentation

E v o l u t i o n a r y A r c h i t e c t u r e THE WHYS AND HOWS Rebecca Parsons Chief Technology Officer ThoughtWorks @rebeccaparsons

WHY SHOULD I CARE? Why should we care? 2

We’re good at requirements change. 3

What about ecosystem change? 4

How is long term planning possible under constant change? 5

How do we maintain this dynamic equilibrium? 6

7

How do we know we’re maintaining our “ilities” over time? 8

WHAT IS EVOLUTIONARY ARCHITECTURE? What is evolutionary architecture? 9

An evolutionary architecture supports guided incremental change across multiple dimensions. 10

An evolutionary architecture supports guided incremental change across multiple dimensions. 11

An evolutionary computing fitness function characterizes how close a solution is to the desired result 12

An architectural fitness function characterizes how close a system is to the desired architectural characteristics. 14

▫ Atomic vs holistic TYPES OF FITNESS FUNCTIONS ▫ Static vs dynamic ▫ Triggered vs continuous ▫ Manual vs automated ▫ Temporal ▫ Domain-specific? 15

▫ Cyclic dependencies EXAMPLE FITNESS FUNCTIONS ▫ Consumer driven contracts ▫ Caching with staleness ▫ Monitoring ▫ Synthetic transactions ▫ Chaos Monkey 16

An evolutionary architecture supports guided incremental change across multiple dimensions. 17

Two aspects of incremental change - application and operations 18

Application functionality 19

Incremental from an operations perspective 20

An evolutionary architecture supports guided incremental change across multiple dimensions. 21

-ilities accessibility reliability repeatability accountability extensibility reproducibility accuracy failure transparency resilience adaptability fault-tolerance responsiveness administrability fidelity reusability affordability flexibility robustness agility inspectability safety auditability installability scalability autonomy integrity seamlessness availability interchangeability self-sustainability compatibility interoperability serviceability composability learnability supportability configurability maintainability securability correctness manageability simplicity credibility mobility stability customizability modifiability standards compliance debugability modularity survivability degradability operability sustainability determinability orthogonality tailorability demonstrability portability testability dependability precision timeliness deployability predictability traceability discoverability process capabilities transparency distributability producibility ubiquity durability provability understandability effectiveness recoverability upgradability efficiency relevance usability 22

PRINCIPLES 23

▫ Last responsible moment PRINCIPLES OF EVOLUTIONARY ARCHITECTURE ▫ Architect and develop for ▫ Postels Law evolvability ▫ Architect for testability ▫ Conway’s Law 24

Last responsible moment 25

Architect and develop for evolvability 26

Postel’s Law 27

Architect for testability 28

Conway’s Law 29

TECHNIQUES 30

▫ Database refactoring TECHNIQUES OF EVOLUTIONARY ARCHITECTURE ▫ Choreography ▫ Contract testing 31

EVOLVABILITY OF DIFFERENT SOFTWARE ARCHITECTURES Evolvability of different software architectures 32

Big ball of mud 33

Structured monolith 34

Layered monolith 35

Micro-kernel 36

Microservices 37

MECHANICS 38

▫ Define your architectural fitness MECHANICS function 39

▫ Define your architectural fitness MECHANICS ▫ Select a dimension you’re most function worried about 40

▫ Define your architectural fitness MECHANICS ▫ Select a dimension you’re most function ▫ Start improving on that worried about dimension 41

▫ Define your architectural fitness MECHANICS ▫ Select a dimension you’re most function ▫ Start improving on that worried about ▫ Focus on what matters most dimension 42

MECHANICS ▫ Define your architectural fitness ▫ Select a dimension you’re most function ▫ Start improving on that dimension worried about ▫ Focus on what matters most ▫ Monitor trends, adapt and repeat 43

THANK YOU @rebeccaparsons 44