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MODELOVÁNÍ V OOP
A LEHKÝ ÚVOD DO DDD
Matěj Koubík @mkoubik
DOMAIN DRIVEN
DESIGN
CO JE TO MODEL?
CO JE TO MODEL?
(užitečné) zjednodušení "reality"
ARCHITEKTURA
WEBOVÉ APLIKACE
UI layer
Application layer
Domain layer
Persistence layer
Storage
CO JE DOMÉNOVÝ
MODEL?
<?php
namespace AppModel;
class Client extends Entity
{
  // ...
}
         
„Zygohistomorphic Prepromorphisms“
„Dual Overhead Rate Recovery“
„It's Lupus“
UBIQUITOUS
LANGUAGE
anglicky!
platí v nějakém kontextu
VALUE OBJECT
Address
$street Pernerova 53
$city Praha 8
$zipCode 186 00
VALUE OBJECT
IMMUTABLE
public function changeZipCode($newZipCode)
{
  return new Address(
    $this­>street,
    $this­>city,
    $newZipCode
  );
}
         
ENTITY
Person
$id 1
$name John Doe
$email john@doe.com
ENTITY
VALIDACE
$validator­>isValid($person);
$person­>isValid();
public function __construct($name)
{
  $this­>name = $name;
}
            
ENTITY
ANEMIC MODEL
if ($person­>getAge() >= 18) {
  $originalName = $person­>getOriginalName();
  $person­>setName($newName);
  $person­>setOriginalName($originalName);
}
            
ENTITY
ANEMIC MODEL
public function rename($newName)
{
  if ($this­>age < 18) {
    throw new Exception;
  }
  $this­>originalName = $this­>name;
  $this­>name = $newName;
}
            
$person­>rename($newName);
            
ENTITY
ANEMIC MODEL
AGGREGATE
FACTORY
interface ICustomerFactory
{
  /**
   * @param string $name
   * @param Address $address
   * @returns Customer
   */
  function create($name, Address $address);
}
            
BOUNDED CONTEXT
class Order extends Entity
{
  // ...
}
            
class Product extends Entity
{
  // ...
}
            
BOUNDED CONTEXT
-- Martin Fowler
BOUNDED CONTEXT
core domain
supporting subdomain
generic subdomain
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")
SERVICE
stateless
singleton
SRP!
DOMAIN EVENT
objekt
ne command
immutable
obsahuje data
může implementovat interface
CO SI ZAPAMATOVAT
make it explicit
definujte slovník
rozlišujte kontext
vyhněte se anemickému modelu
ZDROJE KE STUDIU
ZDROJE KE STUDIU
Domain-Driven Design: Tackling Complexity in the Heart of
Software (Eric Evans)
ZDROJE KE STUDIU
Implementing Domain-Driven Design (Vaughn Vernon)
ZDROJE KE STUDIU
StackOverflow.com
google
DĚKUJI

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Modelování v OOP (a lehký úvod do DDD)