Domain Driven Design

Tackling Complexity in The Heart Of Software

agenda1- What is DDD?

2- Business Logic Layer Patterns

3- DDD Basics

4- DDD Patterns

5- Related Approaches

What ıs domaın drıven desıgn?

What ıs DDD?The term first described by Eric Evans in his book of the same name(2004).

Tackling ComplexityInt the Heart Of Software

What ıs DDD?DDD is an approach to resolve complex and evolving business requirements.

What ıs DDD?

Domain = Business

What ıs DDD?How to Taming Complexity?

Collaborate with stakeholders

What ıs DDD?How to Taming Complexity?

Where is behavior ?

What ıs DDD?Modelling Domain

Models dependent on technologies

What ıs DDD?How to Taming Complexity?

What ıs DDD?Modelling Domain

Publish News != Update News

UnPublish News != Remove News

What ıs DDD?Modelling Domain

Isolate business from technologies

What ıs DDD?How to Taming Complexity?

Classic Layered Architecture DDD Architecture

Focus on business

What ıs DDD?Modelling Domain

Use rich domain model

Busıness logıc layer patterns

BLL Patterns

BLL PatternsTransaction Script

BLL PatternsTable Module

BLL PatternsActive Record

Model, Persistence to Db, Business

All Together

BLL PatternsDomain Model

Focused on Core Business,

Persistence Ignored,

Model + Business

BLL Patterns

Ddd basıcs

DDD basıcsEntities

Objects that have a distinct identity

DDD basıcsValue Objects

An object that contains attributes but has no identity

DDD basıcsValue Objects

An object that contains attributes but has no identity

DDD basıcsBounded Context

DDD basıcsBounded Context

DDD basıcsBounded Context

DDD basıcsAggregates and Aggregate Root

Cluster of Entities and Value Objects

DDD basıcsDomain Services

DDD basıcsPersistence Ignorance

DDD basıcsRefactoring

One of the most important rules in DDD

DDD basıcsAnemic Domain Model vs Rich Domain Model

DDD basıcsAnemic Domain Model vs Rich Domain Model

Ddd patterns

DDD patternsWhen you remember that DDD is really just “OO software done right”, it becomes more obvious that strong OO experience will also stand you in good stead when approaching DDD.

- Jak Charlton

DDD patternsRepository

DDD patternsFactory

DDD patternsStrategy

DDD patternsDependency Injection

DDD patternsCQRS - Command Query Responsibility Seperation

DDD patternsCQRS - Command Query Responsibility Seperation

DDD patternsEvent Sourcing

Related thıngs

Related thıngsClean Code

Related thıngsNoSql Technologies

DDD very suitable for NoSql

Related thıngsTDD - BDD

Related thıngsEvent Driven Architecture

Related thıngsMicroservice Architecture

For More Informations...Books

1- Eric Evans - Domain Driven Design2- Jimmy Nilsson - Applying Domain Driven Design And Patterns3- Vaugh Vernon - Implementing Domain Driven Design

Websites - Thinker

1- Martin Fowler - Blog2- Greg Young3- Jimmy Bogard4- http://dddcommunity.org/5- InfoQ6- Pluralsight

questıons

THANKS

Mustafa Dağdelen