Architecture at scale - The Essentials (Tech.Rocks Meetup)

@CYRIUX ARCHITECTURE À L’ÉCHELLE, L’ESSENTIEL MEETUP TECH.ROCKS 11 JUIN 2020
@CYRIUX @AROLLA @LESINGECUIVRE Cyrille Martraire

SINCE 1999 CYRILLE MARTRAIRE @CYRIUX @AROLLA @LESINGECUIVRE

@CYRIUX OUR COMING EVENTS… https://www.lesingecuivre.com/des-conferences-et-ateliers-inspirants/

@CYRIUX 3 POINTS ON ARCHITECTURE IN GENERAL

@CYRIUX Frugal Solutions Explicit Goals Reversible Decisions @CYRIUX

@CYRIUX Explicit Goals @CYRIUX DON’T TALK SOLUTION WITHOUT A CLEARLY
STATED PROBLEM (REAL PROBLEM)

@CYRIUX Frugal Solutions ANY SOLUTION BRINGS NEW PROBLEMS (CACHE…)

@CYRIUX Reversible Decisions MINIMISE IRREVERSIBLE DECISIONS (KEEP OPTIONS OPEN)

@CYRIUX WHAT ABOUT ARCHITECTURE AT SCALE?

A LITTLE STORY

@CYRIUX ONCE UPON A TIME…

@CYRIUX ONE BIG BALL OF EVERYTHING

@CYRIUX 1 TEAM

@CYRIUX 1 COMPONENT {;}

@CYRIUX ANYBODY CAN DO ANYTHING #NoLimit

@CYRIUX ANYBODY CAN DO ANYTHING #NoLimit #Versatile

@CYRIUX CHEAP. just add code

@CYRIUX DEPLOY AT ONCE #GoLive

@CYRIUX HOLISTIC GROWTH & EVOLUTION! #better

@CYRIUX HOLISTIC GROWTH & EVOLUTION! #better innovate. pivot. big shift.

@CYRIUX LIFE’S GOOD!

@CYRIUX TIME PASSED…

@CYRIUX AND ONE DAY…

@CYRIUX TOO MANY PEOPLE

@CYRIUX INTERFERING ON EACH OTHER’S WORK

@CYRIUX OR TOO MUCH COORDINATION #TooManyMeetings

@CYRIUX DELIVERY SLOWING DOWN #Slow

@CYRIUX FRUSTRATION #sad

@CYRIUX THEY KNEW THE SOLUTION…

@CYRIUX SPLIT! @CYRIUX

@CYRIUX 1. @CYRIUX

@CYRIUX MANY. @CYRIUX

@CYRIUX 1 COMPONENT {;} @CYRIUX

@CYRIUX MANY COMPONENTS {;} {;} {;} {;} @CYRIUX

@CYRIUX 1 TEAM @CYRIUX

@CYRIUX MANY TEAMS @CYRIUX

@CYRIUX LARGE @CYRIUX

@CYRIUX small small small small @CYRIUX

@CYRIUX FRUSTRATION @CYRIUX

@CYRIUX LIFE’S GOOD AGAIN @CYRIUX

@CYRIUX THEY KNEW THE TECHNOLOGIES…

@CYRIUX PaaS Serverless Containers CI/CD pipelines Orchestrators @CYRIUX

@CYRIUX THEY KNEW THE PRACTICES…

@CYRIUX microservices Event-Driven Architecture API’s BFF Gateways @CYRIUX

@CYRIUX BUT STILL, HOW TO DECIDE THE BOUNDARIES?

@CYRIUX @CYRIUX ?

@cyriux @CYRIUX

BOUNDED CONTEXTS @CYRIUX

BOUNDED CONTEXTS @CYRIUX since 2003

BOUNDED CONTEXTS @CYRIUX before it was cool

in autonomy

@cyriux @cyriux

@CYRIUX @CYRIUX

@CYRIUX HOW NOT TO HOW TO @CYRIUX

@cyriux

@CYRIUX HOW NOT TO @CYRIUX

Split by layer W eb Logic Dao DB @cyriux

Split by layer W eb Logic Dao DB EASY

@cyriux

Split by technology EJB ongoDB ode.js

Split by technology EJB ongoDB ode.js EASY

@cyriux random results

Split by Entity User roduct urchase

Split by Entity User roduct urchase EASY

@cyriux worst results

@CYRIUX HOW TO @CYRIUX

Split by Functional Area aym ent atalogue hipping Billing

DESIGN DECISION Functional areas

e-commerce Bounded Contexts • SEO, Trafﬁc Acquisition • Marketing &
Targeting • PIM (Product Identiﬁcation Management) • Catalogue • Categorization • Search • Recommendation • Pricing, Promotions • Basket • Discount, Loyalties • Shipping Cost Estimation • Payment • (Fraud Detection) • Order Management • Billing • Stock / Overbooking • Shipping • Return • CRM

How do we identify Bounded Contexts? 79

80 How do we identify Sub Domains?

@CYRIUX Focus on the language @CYRIUX

Payment Event Anomaly Agent Transaction Transaction Status Account Basket Items
Recent Baskets

Payment Event Anomaly Agent Transaction Transaction Status Account Basket Items
Recent Baskets Shopping Cart Payment Payment Fraud Detection

Sub-Domains Names • Often end in ”-ing” or ”-tion” •
Because purpose verbs made into nouns HEURISTICS

@CYRIUX Focus on the purpose @CYRIUX

THE SAME THING IN THE REAL WORLD (EG A CUSTOMER)
FOR DIFFERENT PURPOSES BECOMES DIFFERENT THINGS

Different perspectives MY catalogue/book is not YOUR shipping/book

“At Amazon, what a book is for you?” •Catalog: Picture,
title, authors, rating, format (ebook or paper), category •Recommandation: List of books often bought together with it •Shipping: Dimensions, weight, international restrictions due to content •Shopping cart: Price, discount eligible •Customer review: List of (rating, review, review rating) •Book Search: title, isbn, authors •Search Inside!: full-text content, copyright- dealing policy thx @gweinbach

@CYRIUX Focus on the Kind of Complexity @CYRIUX

SECRET SAUCE? OR NECESSARY BURDEN? (don’t mix them)

@CYRIUX Mixing All Your Mental Models @CYRIUX

• Directors by departments (Marketing, Sales, Operations, Customer Support…) •
Interviews people and listen to their purpose & language

Pre-Negotiation Listing) B2BOrdering Fraud Détection Payment Sourcing Distribution Rates Grid
RealTime Prices Gift Cards Content & Comparators Sales Promotion Acquisition TV Campaigns Online Ads Company Rating Product Reviews Shopping Cart Catalogue Search Categories Tags Partnerships Secondary Listing Internal Purchasing Rates CrossSales Navigation SEO Marketing

Event Storming PRACTICE

Sub-Domain A sub-sub domain A1 sub-sub domain B1 sub-sub domain
C1 Domain Sub-Domain B Sub-Domain C sub-sub domain A2 sub-sub domain C2 Customers Experience X1 Customers Experience X2 Customers Experience X3 Generic enabler Audience Experiences Business (Sub)- Domains Domain- agnostic Enablers Collaborators Experience X4 Very specific Generic Specific audience Domain- Specific Domain- Agnostic Volatile Stable MAPPING THE POTENTIAL BOUNDED CONTEXTS

@CYRIUX GUIDING DELIVERY PROJECTS @CYRIUX Don’t split for the sake
of it. Split Opportunistically when needed. Never fully done.

Mapping the Potential Bounded Contexts Sub-Domain A sub-sub domain A1
sub-sub domain B1 sub-sub domain C1 Domain Sub-Domain B Sub-Domain C sub-sub domain A2 sub-sub domain C2 Customers Experience X1 Customers Experience X2 Customers Experience X3 Generic enabler Audience Experiences Business (Sub)- Domains Domain- agnostic Enablers Collaborators Experience X4 Very specific Generic Specific audience Domain- Specific Domain- Agnostic Volatile Stable legacy components not aligned (at all)

@CYRIUX (Like Cellular Division)

@CYRIUX Escape the Tyranny of ONE @CYRIUX

@cyriux Fraud Détection Payment Gift Cards n mpany ting Review
Shopping Cart EVENT-SOURCED HEXAGONAL ARCHITECTURE CRUD SaaS

Shopping Cart CASSANDRA POSTGRES ORACLE MongoDB

Shopping Cart Azure API APP on-premise Azure/WEbapp SaaS Azure FUNCTIONS Azure ML

Shopping Cart PERF TEST HERE!

Shopping Cart REWRITE EXTERNALIZE KEEP AS-IS KEEP EXTRACT EXTRACT AS LIB

Shopping Cart NOW WHEN NECESSARY NEXT YEAR LATER Q3 Q4

Shopping Cart API API API API API API

@cyriux

@CYRIUX BUT AFTER THE FIRST VICTORY…

@CYRIUX CAME NEW CHALLENGES…

@CYRIUX Data Sharing Contracts Deployment Units @CYRIUX

@CYRIUX Contracts EXPLICIT COORDINATION TO DEFINE STABLE CONTRACTS → ENABLE
BOTH SIDES TO CHANGE FREELY

@CYRIUX Contracts ACKNOWLEDGE ALL CONTRACTS! DON’T F**ING BREAK THEM!

@CYRIUX Data Sharing @CYRIUX DATA SHARING - SYNC QUERY OR
- DB VIEWS OR - IMMUTABLE - VERSIONED - EVENT-DRIVEN MESSAGING ONLY ONE AUTHORITY FOR EACH DATA (data licence?)

@CYRIUX Deployment Units @CYRIUX

MAPPING THE POTENTIAL BOUNDED CONTEXTS Sub-Domain A sub-sub domain A1
sub-sub domain B1 sub-sub domain C1 Domain Sub-Domain B Sub-Domain C sub-sub domain A2 sub-sub domain C2 Customers Experience X1 Customers Experience X2 Customers Experience X3 Generic enabler Audience Experiences Business (Sub)- Domains Domain- agnostic Enablers Collaborators Experience X4 Very specific Generic Specific audience Domain- Specific Domain- Agnostic Volatile Stable

Sub-Domain A sub-sub domain A1 sub-sub domain B1 sub-sub domain
C1 Domain Sub-Domain B Sub-Domain C sub-sub domain A2 sub-sub domain C2 Customers Experience X1 Customers Experience X2 Customers Experience X3 Generic enabler Audience Experiences Business (Sub)- Domains Domain- agnostic Enablers Collaborators Experience X4 Very specific Generic Specific audience Domain- Specific Domain- Agnostic Volatile Stable SpringBoot Postgres / Elastic Search RabbitMQ Microservice MAPPING THE POTENTIAL BOUNDED CONTEXTS

MAPPING THE TARGET ARCHITECTURE Sub-Domain A sub-sub domain A1 sub-sub
domain B1 sub-sub domain C1 Domain Sub-Domain B Sub-Domain C sub-sub domain A2 sub-sub domain C2 Customers Experience X1 Customers Experience X2 Customers Experience X3 Generic enabler Audience Experiences Business (Sub)- Domains Domain- agnostic Enablers Collaborators Experience X4 Very specific Generic Specific audience Domain- Specific Domain- Agnostic Volatile Stable Modular Monolith

@CYRIUX CALL TO ACTION from where you are, CONSIDER: WHERE
TO SPLIT NEXT? ON WHAT BOUNDARIES? ACKNOWLEDGE: WHAT CONTRACTS ARE ALREADY THERE, EVEN IMPLICITLY? START QUESTIONING: WHO REALLY OWNS EACH PIECE OF DATA?

@CYRIUX OUR COMING EVENTS… https://www.lesingecuivre.com/des-conferences-et-ateliers-inspirants/

@cyriux BUY MY BOOK!

@CYRIUX THE END THANK YOU @AROLLA @LESINGECUIVRE

Architecture at scale - The Essentials (Tech.Ro...

Architecture at scale - The Essentials (Tech.Rocks Meetup)

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