This document discusses domain-driven design and modeling in object-oriented programming. It introduces key concepts like the domain model, entities, value objects, aggregates, repositories, services, bounded contexts, and domain events. The document emphasizes defining an ubiquitous language, avoiding anemic domain models, and separating domain logic from application and persistence logic.

1. MODELOVÁNÍ V OOP
A LEHKÝ ÚVOD DO DDD
Matěj Koubík @mkoubik

2. DOMAIN DRIVEN
DESIGN

3. CO JE TO MODEL?

4. CO JE TO MODEL?
(užitečné) zjednodušení "reality"

5. ARCHITEKTURA
WEBOVÉ APLIKACE
UI layer
Application layer
Domain layer
Persistence layer
Storage

6. CO JE DOMÉNOVÝ
MODEL?

7. <?php
namespace AppModel;
class Client extends Entity
{
// ...
}

8. „Zygohistomorphic Prepromorphisms“

9. „Dual Overhead Rate Recovery“

10. „It's Lupus“

11. UBIQUITOUS
LANGUAGE
anglicky!
platí v nějakém kontextu

12. VALUE OBJECT
Address
$street Pernerova 53
$city Praha 8
$zipCode 186 00

13. VALUE OBJECT
IMMUTABLE
public function changeZipCode($newZipCode)
{
return new Address(
$this­>street,
$this­>city,
$newZipCode
);
}

14. ENTITY
Person
$id 1
$name John Doe
$email john@doe.com

15. ENTITY
VALIDACE
$validator­>isValid($person);
$person­>isValid();
public function __construct($name)
{
$this­>name = $name;
}

16. ENTITY
ANEMIC MODEL
if ($person­>getAge() >= 18) {
$originalName = $person­>getOriginalName();
$person­>setName($newName);
$person­>setOriginalName($originalName);
}

17. ENTITY
ANEMIC MODEL
public function rename($newName)
{
if ($this­>age < 18) {
throw new Exception;
}
$this­>originalName = $this­>name;
$this­>name = $newName;
}
$person­>rename($newName);

18. ENTITY
ANEMIC MODEL

19. AGGREGATE

20. FACTORY
interface ICustomerFactory
{
/**
* @param string $name
* @param Address $address
* @returns Customer
*/
function create($name, Address $address);
}

21. BOUNDED CONTEXT
class Order extends Entity
{
// ...
}
class Product extends Entity
{
// ...
}

22. BOUNDED CONTEXT
-- Martin Fowler

23. BOUNDED CONTEXT
core domain
supporting subdomain
generic subdomain

24. REPOSITORY
$repository = [];
$repository[$product­>getId()] = $product;
interface IProductsRepository
{
function save(Product $product); // make it explicit!
function getById($id); // return whole aggregate!
function delete($id);
}
@ChangeTrackingPolicy("DEFERRED_EXPLICIT")

25. SERVICE
stateless
singleton
SRP!

26. DOMAIN EVENT
objekt
ne command
immutable
obsahuje data
může implementovat interface

27. CO SI ZAPAMATOVAT
make it explicit
definujte slovník
rozlišujte kontext
vyhněte se anemickému modelu

28. ZDROJE KE STUDIU

29. ZDROJE KE STUDIU
Domain-Driven Design: Tackling Complexity in the Heart of
Software (Eric Evans)

31. ZDROJE KE STUDIU
Implementing Domain-Driven Design (Vaughn Vernon)

32. ZDROJE KE STUDIU
StackOverflow.com
google

33. DĚKUJI