7 Years of Domain-Driven Design (DDD Foundations)

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vladikk doit-intl.com #DDDEU 7 YEARS OF DDD or Tackling Complexity in Large Scale Marketing Systems

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vladikk doit-intl.com #DDDEU YAY!!!

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU Your Product Marketing Strategy Creatives Campaigns Sales Agents Optimization Profits

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vladikk doit-intl.com #DDDEU THE FIRST BOUNDED CONTEXT 01

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU

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Very nice!!!1

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vladikk doit-intl.com #DDDEU Aggregates everywhere!!!

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vladikk doit-intl.com #DDDEU Aggregates everywhere!!! Creative Agency Advertiser Publisher Website Placement Ad Zone Ad Type Target Market Group Zone Type Funnel Contract Budget Unit Campaign

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vladikk doit-intl.com #DDDEU The Bounded Context Creative Agency Advertiser Publisher Website Placement Ad Zone Ad Type Target Market Group Zone Type Funnel Contract Budget Unit Audience

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vladikk doit-intl.com #DDDEU Domain Model Service / Application Layer Presentation Infrastructure Anemic! Behaviour

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vladikk doit-intl.com #DDDEU Imperfect architecture “QA is for cowards” BUT IT WORKED!

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vladikk doit-intl.com #DDDEU UBIQUITOUS LANGUAGE

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vladikk doit-intl.com #DDDEU Domain Experts Software Developers No experience in online marketing Nice people!

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vladikk doit-intl.com #DDDEU Smooth communication Strong grasp of the business domain Working software Aggressive time to market

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vladikk doit-intl.com #DDDEU Ubiquitous Language Anemic Domain Model

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vladikk doit-intl.com #DDDEU Leads Sales Agents Ads

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vladikk doit-intl.com #DDDEU Leads CRM Categorize Desk Desk Desk Sales Agents Sales Agents Sales Agents Clients’ Systems

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU THE CRM BOUNDED CONTEXT 02

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vladikk doit-intl.com #DDDEU Ubiquitous Language Anemic Domain Model

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vladikk doit-intl.com #DDDEU Creative Agency Publisher Website Advertiser Ad Zone Ad Type Target Market Group Zone Type Funnel Contract Budget Unit Audience Group Desk Qualification Assessment Organization Unit Assignment Rank Message On-site Activity Placement Visit Brand Marketing Lead CRM Lead Marketing Campaign CRM Campaign

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vladikk doit-intl.com #DDDEU Domain Experts Software Developers …. Lead …. …. Campaign…

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU BOUNDED CONTEXTS PROTECT THE LANGUAGE AGGREGATES PROTECT CONSISTENCY OF DATA

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vladikk doit-intl.com #DDDEU Creative Agency Publisher Website Advertiser Ad Zone Ad Type Target Market Group Zone Type Funnel Contract Budget Unit Audience Placement Visit Lead Campaign Marketing Group Desk Qualification Assessment Organization Unit Assignment Rank Message On-site Activity Brand Lead Campaign CRM

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vladikk doit-intl.com #DDDEU Aggregates will: • Protect transactional boundaries  • Encompass business logic and invariants Domain Service / Application Layer Presentation Infrastructure

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vladikk doit-intl.com #DDDEU Aggregates will: • Protect transactional boundaries  • Encompass business logic and invariants Domain Service / Application Layer Presentation Infrastructure Domain Service / Application Layer

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU Stored procedures???

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vladikk doit-intl.com #DDDEU Group Desk Qualification Assessment Organization Unit Assignment Rank Message On-site Activity Brand Lead Campaign Lead

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vladikk doit-intl.com #DDDEU L e a d CRM Team DBA Team

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vladikk doit-intl.com #DDDEU

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vladikk doit-intl.com #DDDEU Inconsistent models No shared understanding Duplication of knowledge Went out of sync quickly NIGHTMARE

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vladikk doit-intl.com #DDDEU Wasn’t delivered on time

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vladikk doit-intl.com #DDDEU Wasn’t delivered on time Production issues

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vladikk doit-intl.com #DDDEU Wasn’t delivered on time Production issues Data corruption

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vladikk doit-intl.com #DDDEU Wasn’t delivered on time Production issues Data corruption Thrown away and reimplemented

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vladikk doit-intl.com #DDDEU Ubiquitous Language Domain Model Bounded Contexts Protect w/ Implement as

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vladikk doit-intl.com #DDDEU Ubiquitous Language Domain Model Bounded Contexts Protect w/ Implement as …Dude, where are Sub-Domains?

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Not all of a large system will be well designed “ Eric Evans

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vladikk doit-intl.com #DDDEU THE CRUNCHERS BOUNDED CONTEXT 03

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vladikk doit-intl.com #DDDEU Marketing CRM Analysis Customer Events Marketing CRM

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vladikk doit-intl.com #DDDEU Marketing CRM Analysis Customer Events Event Crunchers

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vladikk doit-intl.com #DDDEU Competitive advantage? - No Off-the-shelve solution? - No => Supporting sub-domain

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vladikk doit-intl.com #DDDEU Layered Architecture Transaction Script Worked …. for a while

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vladikk doit-intl.com #DDDEU Customer Events Event Crunchers Marketing CRM Analysis Flag Flag Calculated fields

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vladikk doit-intl.com #DDDEU Marketing CRM Analysis Customer Events Event Crunchers

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vladikk doit-intl.com #DDDEU Customer Events Event Crunchers (BBOM) CRM Marketing Analysis

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vladikk doit-intl.com #DDDEU Customer Events Event Crunchers (Event Sourced) CRM Marketing Analysis

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vladikk doit-intl.com #DDDEU THE BONUSES BOUNDED CONTEXT 04

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vladikk doit-intl.com #DDDEU Sales Commissions Reports

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vladikk doit-intl.com #DDDEU Competitive advantage? - No Off-the-shelve solution? - No => Supporting sub-domain

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vladikk doit-intl.com #DDDEU Active Record Service / Application Layer Presentation Infrastructure

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vladikk doit-intl.com #DDDEU Sales Commissions Reports Let’s try different percentages What if the percentage could be a function of a price? No, what if the percentage is a function of number of sales? No, no, the percentage will be a function both of number of sales and sale amount And another upgrade if there are more than Y sales per week! But we will upgrade the percentage if there are more than X sales per month!

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vladikk doit-intl.com #DDDEU Event Sourced Domain Model Service / Application Layer Presentation Infrastructure BIG BALL OF MUD

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vladikk doit-intl.com #DDDEU Active Record Service / Application Layer Presentation Infrastructure Transaction Script Service / Application Layer Presentation Infrastructure Event Crunchers Bonuses Ubiquitous Language

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vladikk doit-intl.com #DDDEU Event Sourced Domain Model Service / Application Layer Presentation Infrastructure Event Sourced Domain Model Service / Application Layer Presentation Infrastructure Event Crunchers Bonuses Ubiquitous Language

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vladikk doit-intl.com #DDDEU Ubiquitous Language Core Bounded Contexts Protect by  decomposing to Identify Domains Domain Model Supporting Generic AR / TS Adopt Implement as

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vladikk doit-intl.com #DDDEU WHAT WE HAVE L E A R N E D

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vladikk doit-intl.com #DDDEU UBIQUITOUS LANGUAGE 01

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vladikk doit-intl.com #DDDEU UBIQUITOUS LANGUAGE THE CORE DOMAIN OF DOMAIN-DRIVEN DESIGN

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vladikk doit-intl.com #DDDEU Marketing Ubiquitous Language Business goals achieved CRM Ubiquitous Language Production issues Long and painful refactoring Event Crunchers Ubiquitous Language Big ball of mud Bonuses Ubiquitous Language Refactored in time

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vladikk doit-intl.com #DDDEU DOMAIN TYPES 02

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vladikk doit-intl.com #DDDEU Core Supporting Generic

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vladikk doit-intl.com #DDDEU Generic Domain Adopt / Buy Supporting Domain Active Record / Transaction Script Core Domain Domain Model / Event Sourcing

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vladikk doit-intl.com #DDDEU COMPANIES CHANGE, EVOLVE, REINVENT THEMSELVES DOMAINS' TYPES CHANGE ACCORDINGLY

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vladikk doit-intl.com #DDDEU SUPPORTING ➤ CORE • Event Crunchers • Bonuses

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vladikk doit-intl.com #DDDEU Generic Domain Adopt / Buy Supporting Domain Active Record / Transaction Script Core Domain Domain Model / Event Sourcing

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vladikk doit-intl.com #DDDEU Generic Domain Adopt / Buy Supporting Domain Active Record / Transaction Script Core Domain Domain Model / Event Sourcing

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vladikk doit-intl.com #DDDEU Less waste Dialog with the business IMPLEMENTATION DESIGN ➤ DOMAIN TYPE

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vladikk doit-intl.com #DDDEU • Questionable competitive edge? • Unexpected competitive edge? BUSINESS COMPLEXITY ≠ DOMAIN TYPE?

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vladikk doit-intl.com #DDDEU SUMMARY

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vladikk doit-intl.com #DDDEU Creative Agency Advertiser Publisher Website Placement Ad Zone Ad Type Target Market Group Zone Type Funnel Contract Budget Unit Campaign Aggregates everywhere!!!

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vladikk doit-intl.com #DDDEU Ubiquitous Language Bounded Contexts Protect by  decomposing to Design  Implementation Core Supporting Generic Domain Model AR / TS Adopt Confirm w/  Business Ubiquitous Language Everywhere!!!

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https://bit.ly/2ptJ5fS THANK YOU! @vladikk vladikk.com https://bit.ly/31nSD9c http://careers.doit-intl.com