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Event sourcing w PHP (by Piotr Kacała)

GOG.com dev team
GOG.com dev team
GOG.com dev teamWeb Development Team at GOG.com

Event sourcing w pigułce czyli podróże w czasie i odporność na coraz to bardziej kreatywne wymagania biznesowe. Kiedy, jak i po co tworzyć naturalny log wydarzeń Twojej aplikacji - plusy i minusy wzorca, przykłady implementacji, event sourcing a CQRS.

Event sourcing w PHP (by Piotr Kacała)

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EVENT SOURCING (W PHP)
PIOTR KACAŁA
EVENT SOURCING
ZBUDUJMY SOBIE KOSZYK!
POBIERANIE ZAWARTOŚCI KOSZYKA
mysql> select * from cart_products;
+---------+------------+
| cart_id | product_id |
+---------+------------+
| 1 | 124 |
| 1 | 89 |
+---------+------------+
DODANIE PRODUKTU DO KOSZYKA
POST /CARTS/{CID}/PRODUCTS
INSERT INTO CART_PRODUCTS (…)
USUNIĘCIE PRODUKTU Z KOSZYKA
DELETE /CARTS/{CID}/PRODUCTS/{PID}
DELETE FROM CART_PRODUCTS (…)
Ad

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Event sourcing w PHP (by Piotr Kacała)

  • 1. EVENT SOURCING (W PHP) PIOTR KACAŁA
  • 4. POBIERANIE ZAWARTOŚCI KOSZYKA mysql> select * from cart_products; +---------+------------+ | cart_id | product_id | +---------+------------+ | 1 | 124 | | 1 | 89 | +---------+------------+
  • 5. DODANIE PRODUKTU DO KOSZYKA POST /CARTS/{CID}/PRODUCTS INSERT INTO CART_PRODUCTS (…)
  • 6. USUNIĘCIE PRODUKTU Z KOSZYKA DELETE /CARTS/{CID}/PRODUCTS/{PID} DELETE FROM CART_PRODUCTS (…)
  • 8. PRZYPOMNIJMY mysql> select * from cart_products; +---------+------------+ | cart_id | product_id | +---------+------------+ | 1 | 124 | | 1 | 89 | +---------+------------+
  • 10. A CO JEŚLI? select * from salda_bankowe; +---------------------+----------------+ | rachunek | ile_pieniazkow | +---------------------+----------------+ | 4444 3333 2222 1111 | 1000 | +---------------------+----------------+
  • 12. TRUDNO SIĘ KŁÓCIĆ +---------------------+----------------+ | rachunek | ile_pieniazkow | +---------------------+----------------+ | 4444 3333 2222 1111 | 1000 | +---------------------+----------------+
  • 13. CZYM JEST EVENT SOURCING?
  • 14. EVENT STORE Cart #1 Was Created Product #B Added 
 To The Cart Product #A Removed 
 From The Cart Product #A Added 
 To The Cart Cart #1 Was Checked Out
  • 15. EVENT STORE Cart #1 Was Created Product #B Added 
 To The Cart Product #A Removed 
 From The Cart Product #A Added 
 To The Cart Cart #1 Was Checked Out
  • 16. JAK UPRAWIAĆ EVENT SOURCING (W PHP)?
  • 17. TRADYCYJNY KOSZYK class Cart
 {
 private $id;
 private $products = [];
 
 public function add($productId)
 { // changing the state of the cart $this->products[] = $productId;
 }
 }
  • 18. KOSZYK PRODUKUJĄCY EVENTY class Cart
 {
 private $id;
 private $products = [];
 private $raisedEvents = [];
 
 public function add($productId)
 { // changing the state of the cart
 $this->products[] = $productId;
 
 // let's raise an event
 $this->raisedEvents[] = new ProductAddedToCart($this->id, $productId);
 }
 }
  • 20. EVENT STORE Cart Was Created Product #2 Added 
 To The Cart Product #1 Added 
 To The Cart Cart Was Checked Out Product #1 Removed 
 From The Cart
  • 21. EVENT STORE mysql> select * from event_store; +----+--------------+-------------------------------------------+ | id | aggregate_id | event | +----+--------------+-------------------------------------------+ | 1 | 1 | CartWasCreated({"cartId":"1"}) | | 2 | 1 | ProductAddedToCart({"productId":"A"}) | | 3 | 1 | ProductRemovedFromCart({"productId":"A"}) | | 4 | 1 | ProductAddedToCart({"productId":"B"}) | +----+--------------+-------------------------------------------+
  • 22. ODTWARZANIE AGREGATU KOSZYKA W REPOZYTORIUM class EventSourcedCartRepository implements CartRepository
 {
 public function find($aggregateId)
 {
 $events = $this->eventStore->findEvents($aggregateId);
 $cart = new Cart(); // inicjalizacja pustego agregatu
 
 // "nagrywanie" eventów na agregacie cartu
 foreach($events as $event) { 
 // metoda apply() woła odpowiednie metody prywatne
 // na podstawie nazwy przekazywanego eventu, np.
 // ProductWasAddedToCart => applyProductWasAddedToCart
 $cart->apply($event); 
 }
 }
 }
  • 23. ENCJA class Cart {
 // this method is called by event store to replay event on the cart protected function applyProductAddedToCart(ProductAddedToCart $event)
 {
 $this->products[] = $event->getProductId();
 }
 }
  • 24. OBIE METODY class Cart
 {
 public function add($productId)
 {
 if ($this->products > 2) {
 throw new CartLimitExceeded();
 }
 
 // raise the event
 $event = new ProductAddedToCart($this->id, $productId);
 $this->raisedEvents[] = $event;
 
 // change the state
 $this->applyProductAddedToCart($event);
 }
 
 // change the state, this is called by Event Store
 public function applyProductAddedToCart(ProductAddedToCart $event)
 {
 $this->products[] = $event->getProductId();
 }
 }
  • 27. EVENT STORE mysql> select * from event_store; +----+--------------+-------------------------------------------+ | id | aggregate_id | event | +----+--------------+-------------------------------------------+ | 1 | 1 | CartWasCreated({"cartId":"1"}) | | 2 | 1 | ProductAddedToCart({"productId":"A"}) | | 3 | 1 | ProductRemovedFromCart({"productId":"A"}) | | 4 | 1 | ProductAddedToCart({"productId":"B"}) | +----+--------------+-------------------------------------------+
  • 29. MAŁY RECAP Obiekt 
 domeny Event Store Listenery Eventy TRAFIAJĄ DO ZAPISYWANE W PRODUKUJE
  • 30. PROJEKCJE class CurrentCartProductsProjector
 {
 public function applyProductAddedToCart(ProductAddedToCart $event)
 {
 $this->connection->query('insert into cart_products ...');
 }
 
 public function applyProductRemovedFromCart(ProductRemovedFromCart $event)
 {
 $this->connection->query('delete from cart_products ...');
 }
 }
  • 31. POBIERANIE ZAWARTOŚCI KOSZYKA mysql> select * from cart_products; +---------+------------+ | cart_id | product_id | +---------+------------+ | 1 | 124 | | 1 | 89 | +---------+------------+
  • 32. CQRS W PEŁNI SWOJEJ CHWAŁY Cart::add Zapis w 
 Event Store Product Was Added To Cart Cart State Projector SQL Redis
  • 33. CO Z ZADANIEM OD PANI MAŁGOSI?
  • 35. PLUSY EVENT SOURCINGU - HISTORYCZNY STAN APLIKACJI - DEBUGOWANIE - PROSTY MODEL ZAPISU - ODPORNOŚĆ NA KREATYWNOŚĆ BIZNESU - ŁATWA SKALOWALNOŚĆ - WSPÓŁGRA Z MIKROSERWISAMI
  • 36. MINUSY EVENT SOURCINGU - PRÓG WEJŚCIA (ZMIANA PRZYZWYCZAJEŃ) - KONIECZNOŚĆ SHARDOWANIA EVENT STORE’U* - DŁUŻSZY ŁADOWANIE OBIEKTÓW DOMENOWYCH** - ZWIĘKSZA ZŁOŻONOŚĆ APLIKACJI (VS CRUD) * NIE DOTYCZY WSZYSTKICH APLIKACJI ** ROZWIĄZANY PRZEZ SNAPSHOTY
  • 41. /WORK