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AND ITS LOGIC MIND YOUR BUSINESS

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Vladik Khononov Chief Architect @ Internovus @vladikk http://vladikk.com

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BUSINESS LOGIC

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PRESENTATION LAYER BUSINESS LOGIC LAYER DATA ACCESS LAYER

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PRESENTATION LAYER BUSINESS LOGIC LAYER DATA ACCESS LAYER

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Transaction Script Active Record Domain Model Event Sourced Domain Model

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TRANSACTION SCRIPT

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TRANSACTION SCRIPT ▸ Simple Business Logic ▸ CRUD ▸ Input Validation ▸ Extract Transform Load (ETL) ▸ Simple Data Structures ▸ Always leave the database in a consistent state

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 APPLICATION CREATE USER UPDATE USER SEARCH USERS DATABASE UI

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public class CreateUser { public void Execute(name, email) { try { DB.StartTransaction();
 var row = DB.NewUserRow();
 row.Name = name;
 row.Email = email;
 DB.Append(row);
 DB.Commit(); } catch { DB.Rollback();
 throw; } } }

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ACTIVE RECORD

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ACTIVE RECORD ▸ Simple Business Logic ▸ CRUD ▸ Input Validation ▸ Extract Transform Load (ETL) ▸ Complex Data Structures ▸ References / Collections ▸ Multiple Tables

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USER INTERESTS ID NAME Has
 many ADDRESS COUNTRY CITY STREET

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 APPLICATION CREATE USER UPDATE USER SEARCH USERS DATABASE UI

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 APPLICATION CREATE USER UPDATE USER SEARCH USERS UI 
 ACTIVE
 RECORDS USER DATABASE

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public class CreateUser { public void Execute(userDetails) { try { DB.StartTransaction();
 
 var user = new User();
 user.Name = userDetails.Name;
 user.Email = userDetails.Email;
 user.Save();
 
 DB.Commit(); } catch { DB.Rollback();
 throw; } } }

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public class User { public Guid Id { get; set; }
 public string Name { get; set; }
 public List Interests { get; set; }
 public Address Address { get; set; } public void Save() { … }
 public void Delete() { … }
 public static User Get(Guid id) { … }
 public static List GetAll() { … } }

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DOMAIN MODEL

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DOMAIN MODEL ▸ Complex Business Logic ▸ Business rules ▸ Invariants ▸ Calculations ▸ Complex algorithms

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 APPLICATION CREATE USER UPDATE USER SEARCH USERS UI 
 ACTIVE
 RECORDS USER DATABASE

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 APPLICATION CREATE USER UPDATE USER SEARCH USERS UI 
 DOMAIN
 MODEL USER DATABASE

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 APPLICATION CREATE USER UPDATE USER SEARCH USERS UI 
 DOMAIN
 MODEL USER INFRASTRUCTURE

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DOMAIN MODEL ▸ Complex business logic ▸ Model business domain ▸ Objects: data + behavior ▸ Plain objects ▸ Minimal application level use cases

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public class UpdateUser { public void Execute(userDetails) { try { var user = usersRepository.Get(userDetails.Id);
 user.UpdateDetails(userDetails);
 usersRepository.Save(user); } catch { DB.Rollback();
 throw; } } }

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public class User { public Guid Id { get; private set; }
 public string Name { get; private set; }
 public List Interests { get; private set; }
 public Address Address { get; private set; } public void UpdateDetails() { … }
 public void AddInterest() { … }
 public static User InitializeNew() { … } } public interface IUsersRepository { User Get(Guid id);
 void Save(User user);
 void Delete(User user); }

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 APPLICATION CREATE USER UPDATE USER SEARCH USERS UI 
 DOMAIN
 MODEL USER INFRASTRUCTURE

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EVENT SOURCED
 DOMAIN MODEL

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EVENT SOURCED DOMAIN MODEL ▸ Complex Business Logic ▸ Business rules ▸ Invariants ▸ Complex algorithms ▸ Deals w/ money ▸ Data analysis required ▸ Audit required by law

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EVENT SOURCED DOMAIN MODEL Phone Email Name Id 46464543 [email protected] James 1 34234343 [email protected] John 2

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public class NewUserInitialized { public Guid UserId { get; private set; }
 public string Name { get; private set; }
 public string Email { get; private set; } } public class NameChanged { public Guid UserId { get; private set; }
 public string NewName { get; private set; } } public class EmailChanged { public Guid UserId { get; private set; }
 public string NewEmail { get; private set; } }

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EVENT SOURCED DOMAIN MODEL ▸ UserInitialized(1, John, [email protected]) ▸ NameChanged(1, James) ▸ EmailChanged(1, [email protected])

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 APPLICATION CREATE USER UPDATE USER SEARCH USERS UI 
 DOMAIN
 MODEL USER EVENT STORE

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Transaction Script Active Record Domain Model Event Sourced Domain Model

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APPLICATION ARCHITECTURE

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LAYERED ARCHITECTURE PRESENTATION LAYER BUSINESS LOGIC LAYER DATA ACCESS LAYER

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HEXAGONAL / PORTS & ADAPTERS / ONION / CLEAN ARCHITECTURE CORE SERVICES INFRASTRUCTURE

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CQRS - COMMAND QUERY RESPONSIBILITY SEGREGATION WRITE MODEL COMMANDS UI READ MODEL QUERIES

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«SHLIKHTA» ARCHITECTURE EVERYTHING

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EVENT SOURCED DOMAIN MODEL • Shlikhta Architecture • Layered Architecture • Hexagonal Architecture • CQRS • Transaction Script • Active Record • Domain Model • Event Sourced Domain Model

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TESTING STRATEGIES

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TESTS PYRAMID UI
 /
 End to End Service / API
 layer tests Unit Tests

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TESTS PYRAMID UI
 /
 End to End Service / API
 layer tests Unit Tests

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TESTS PYRAMID UI
 /
 End to End Service / API
 layer tests Unit Tests

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TESTS PYRAMID UI
 /
 End to End Service / API
 layer tests Unit Tests

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TESTING STRATEGIES • End to end tests • API layer tests • Unit tests • Unit tests • Transaction Script • Active Record • Domain Model • Event Sourced Domain Model

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LANGUAGE AND TECHNOLOGY

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PROGRAMMING STYLE • Procedural • Procedural / OOP • OOP • Functional • Transaction Script • Active Record • Domain Model • Event Sourced Domain Model

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DYNAMIC / STATIC TYPING • Dynamic • Dynamic • Static • Static • Transaction Script • Active Record • Domain Model • Event Sourced Domain Model

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RAMIFICATIONS ▸ Architectural style / pattern ▸ Testing strategy ▸ Language and technology ▸ Programming style ▸ Language type

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DECISION HEURISTIC ▸ Is the business logic mostly CRUD / ETL? Yes ▸ Are the data structures simple? yes - Transaction Script ▸ Are the data structures simple? No -Active Record ▸ Is the business logic mostly CRUD / ETL? No ▸ Is advanced analysis required, or dealing w/ money? No
 Domain Model ▸ Is advanced analysis required, or dealing w/ money? Yes
 Event Sourced Domain Model

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TRANSACTION SCRIPT ACTIVE RECORD DOMAIN MODEL EVENT SOURCED DOMAIN MODEL

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AGILE ARCHITECTURE

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TRANSACTION SCRIPT / SHLIKHTA ACTIVE RECORD / LAYERS DOMAIN MODEL / HEXAGONAL EVENT SOURCED DOMAIN MODEL / CQRS

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DECISION SCOPE

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CAMPAIGN MANAGEMENT LEAD MANAGEMENT

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 CAMPAIGN MANAGEMENT 
 LEAD MANAGEMENT CREATIVE CATALOG CAMPAIGN PUBLISHING BILLING USERS MANAGEMENT SALES COMMISSIONS CALCULATION DESK MANAGEMENT VOIP MANAGEMENT

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SUMMARY

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Business Driven Architecture

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QUESTIONS?

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THANK YOU Vladik Khononov Chief Architect @ Internovus @vladikk http://vladikk.com