Implementing DDD in your project

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Sergio Moya @soyelsergillo IN

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@SOYELSERGILLO GITHUB.COM/SMOYA Backend Engineer at Social Point ! DDD Fan ! Hip Hop Culture lover ! Badaloní (from Badalona) SERGIO

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WHAT

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MODEL 3 2 4 1 DOMAIN CONTEXT UBIQUITOUS

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UBIQUITOUS

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KNOW YOUR UBIQUITOUS LANGUAGE

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The Lead of the Backend engineers team has decided to split the team into smaller two-member teams. ! Each team will develop a different component. ! Our team will develop the Payment Component

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THE

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OUR

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GENERATING

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THE

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THE

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AND

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THE

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SERVICE ORM CONTRO LLER REPOSIT ORY DB MANAGER YOUR

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THIS IS WAR!

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BUT YOU WANT THIS

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BUT WE WANT THIS TODAY YOU WILL GET THIS

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LET’S

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…⋯ SRC …⋯ …⋯ PAYMENTBUNDLE …⋯ COMPONENT PAYMENT BUNDLE FILE

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OUR

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OUR

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OUR

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We are recording Events!

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BUT WHAT IS A DOMAIN EVENT?

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“CAPTURES

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DOMAIN

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DOMAIN

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DOMAIN

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DOMAIN

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REMEMBER A CUSTOMER CAN ORDER A PRODUCT ! A CUSTOMER CAN PAY AN ORDER

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OUR

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OUR

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public function pay(Money $money)! {! try {! if (!$this->product->getPrice()->isEqualTo($money)) {! throw new OrderException('The Order amount is not satisfied');! }! $this->product->deliver($this->customer);! $this->status = OrderStatus::create(OrderStatus::ORDER_PAID);! } catch (\Exception $e) {! $this->status = OrderStatus::create(OrderStatus::ORDER_FAILED);! }! return $this->status;! } OUR

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WHAT

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WHAT

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interface OrderRepository! {! public function exists($id);! ! public function find($id, $customerId);! ! public function findByCustomerId($customerId);! ! public function save($id, $productId, $customerId, $status = 1);! ! public function remove($id);! ! public function removeByCustomerId($customerId);! ! public function clearAll();! }! OUR

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OK,

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OK,

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public function buyProductAction(Request $request)! {! $customer = new Customer($request->request->get('customerId'));! ! $productRepository = $this->get('tato.payment.product_respository');! $product = $productRepository->find($request->request->get('productId'));! ! $order = $customer->order($product);! ! $paid = new Money(! $request->request->get('paid'), ! $request->request->get(‘currency')! );! $status = $order->pay($paid);! ! $this->get(‘tato.payment.order_repository')->save(! ! ! $order->getId(), ! $product, ! $customer->getId(), ! $status->getStatus()! );! ! return new JsonResponse(array('status' => $status->getStatus()));! }! } A

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LET’S

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TAKE A PIECE OF CQRS COMMAND QUERY RESPONSIBILITY SEGREGATION

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Any method that mutates state. Any method that returns a value. COMMAND QUERY COMMAND

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class BuyProductCommand! {! public $customerId;! ! public $productId;! ! public $paid;! ! public $currency;! ! public function __construct($customerId, $productId, $paid, $currency)! {! $this->customerId = $customerId;! $this->productId = $productId;! $this->paid = $paid;! $this->currency = $currency;! } ! } THE

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public function handle(BuyProductCommand $command)! {! $customer = new Customer($command->customerId);! $product = $this->productRepository->find($command->productId);! ! $order = $customer->order($product);! $status = $order->pay(new Money($command->paid, $command->currency));! ! $events = $customer->getRecordedEvents();! ! // @todo do something with this events! ! $this->orderRepository->setOrder(! $command->gatewayName,! $order->getId(),! $command->customerId,! $status->getStatus()! );! ! return $order;! } A

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COMPONENT

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IMAGINE

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FILE

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OUR

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CONSTRUCT

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INFRASTRUCTURE

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SERVICES services:! tato.payment.order_repository:! class: Tato\Component\Game\CustomOrderRepository! arguments:! - @doctrine.orm.entity_manager! ! tato.payment.product_repository:! class: Tato\Component\Game\Product\CustomProductRepository! arguments:! - @doctrine.orm.entity_manager! ! tato.payment.command.handler.buy_product:! class: Tato\Component\Payment\Command\BuyProductCommandHandler! arguments:! order_repository: @tato.payment.order_repository! product_repository: @tato.payment.product_repository!