MODELOVÁNÍ V OOPA LEHKÝ ÚVOD DO DDD

Matěj Koubík @mkoubik

DOMAIN DRIVENDESIGN

CO JE TO MODEL?

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

ARCHITEKTURAWEBOVÉ APLIKACE

UI layer

Application layer

Domain layer

Persistence layer

Storage

CO JE DOMÉNOVÝMODEL?

<?php

namespace App\Model;

class Client extends Entity // ...

„Zygohistomorphic Prepromorphisms“

„Dual Overhead Rate Recovery“

„It's Lupus“

UBIQUITOUSLANGUAGE

anglicky!

platí v nějakém kontextu

VALUE OBJECTAddress

$street Pernerova 53

$city Praha 8

$zipCode 186 00

VALUE OBJECTIMMUTABLE

public function changeZipCode($newZipCode) return new Address( $this­>street, $this­>city, $newZipCode );

ENTITYPerson

$id 1

$name John Doe

$email john@doe.com

ENTITYVALIDACE

$validator­>isValid($person);

$person­>isValid();

public function __construct($name) $this­>name = $name;

ENTITYANEMIC MODEL

if ($person­>getAge() >= 18) $originalName = $person­>getOriginalName(); $person­>setName($newName); $person­>setOriginalName($originalName);

ENTITYANEMIC MODEL

public function rename($newName) if ($this­>age < 18) throw new \Exception;

$this­>originalName = $this­>name; $this­>name = $newName;

$person­>rename($newName);

ENTITYANEMIC MODEL

AGGREGATE

FACTORYinterface ICustomerFactory /** * @param string $name * @param Address $address * @returns Customer */ function create($name, Address $address);

BOUNDED CONTEXTclass Order extends Entity // ...

class Product extends Entity // ...

BOUNDED CONTEXT

-- Martin Fowler

BOUNDED CONTEXTcore domainsupporting subdomaingeneric 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")

SERVICEstatelesssingletonSRP!

DOMAIN EVENTobjektne commandimmutableobsahuje datamůže implementovat interface

CO SI ZAPAMATOVATmake it explicitdefinujte slovníkrozlišujte kontextvyhněte se anemickému modelu

ZDROJE KE STUDIU

ZDROJE KE STUDIUDomain-Driven Design: Tackling Complexity in the Heart of

Software (Eric Evans)

ZDROJE KE STUDIUImplementing Domain-Driven Design (Vaughn Vernon)

ZDROJE KE STUDIUStackOverflow.comgoogle

DĚKUJI