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Svaťa
Šimara
Persistence
Domain-Driven Design
Persistence
Domain-Driven Design
Request-Response
Problémy
• Smíchaná logika a persistence
• Obtížné na pochopení
– Hlavně pokud potřebujeme
více doménových objektů
• Obtížné testování
Systém běžící v paměti
Mentální cvičení
Systém v paměti
• Systém se nevypíná
• Paměť je mezi requesty
zachována
• Neobsluhuje více requestů
najednou
• Mění svůj stav
• Obsahuje pouze logiku
• Snadnější na pochopení
– Nestaráme se o ukládání
• Kolekce jsou součástí logiky
• Snadné testování
• Žádná save() operace
Systém v paměti
Persistentní kolekce
• Iluze systému běžícího v paměti
– Zachovává výhody
• Umožňuje persistenci
– Neříkáme jak je zařízena
Persistentní kolekce
Repository
• Persistentní kolekce
• Iluze systému v paměti
• Doménové rozhraní
– Doménový prvek
• Metody jako kolekce v paměti
– get(), remove(), add()
• Pouze pro agregáty
Repository
Vrstvy
Opakování
Infrastruktura
• Kanály
• Trubky
• Odvoz odpadu
• Elektrické sítě
• …
Infrastruktura
• Zajišťuje životaschopnost
• Nechceme se o ni starat
• Nahraditelná
– Potřebuju lepší dodávku
energie, tak změním
dodavatele
Vrstva
infrastruktury
Vrstva
infrastruktury
• Implementace doménových
rozhraní
– Repozitářů!
• Nahraditelná
• Umožňuje odložit důležitá
rozhodnutí
– Nebo je změnit
Vrstva
infrastruktury
• Databáze
• Doctrine, mapování
• Napojení na externí systémy
Konec
Opakování
Zápis persistence
Zápis
persistence
• Chybí nám operace zápisu
• Repozitáře nejsou zodpovědné za
samotný zápis
– Jsou to kolekce
• Za zápis je zodpovědný někdo jiný
Persistentní
middleware
• Je zodpovědný za zápis
• Vše provádí v transakci
Demo
simara-svatopluk/ddd-course-workshop
Doctrine
• Umí toho hodně
• Přemýšlejte nad use-casy
– Vše nemusí být entity
– JSON je ok
– CO od dat chcete
• Super nástroj při vhodném použití
• Viděli jste ne úplně běžné použití
Závěrem k DDD
DDD
• Doména
• Doména
• Doména
DDD
• Doména
• Jazyk
• Případy užití
• Modelování
• Oddělení vrstev
Domain-Driven
Design Svaťa Šimara
svatasimara.cz
simara-svatopluk
@svatasimara
Příště
Read Model
CQRS

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DDD kurz - 5. Persistence + Doctrine