Modelling
Messaging and Ecotone In Depth
CQRS PHP
Command Query Responsibility Segregation PHP
What is CQRS and What Does It Give
To The Code!
Registering Command Handlers
Let's create
PlaceOrder Command that will place an order in our system.1
class PlaceOrder
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{
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private string $orderId;
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private string $productName;
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​
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public function __construct(string $orderId, string $productName)
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{
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$this->orderId = $orderId;
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$this->productName = $productName;
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}
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​
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public function getOrderId(): string
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{
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return $this->orderId;
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}
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​
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public function getProductName(): string
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{
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return $this->productName;
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}
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}
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And
Command Handler that will handle this Command1
use Ecotone\Modelling\Attribute\CommandHandler;
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​
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class OrderService
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{
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private array $orders;
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​
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#[CommandHandler]
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public function placeOrder(PlaceOrder $command) : void
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{
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$this->orders[$command->getOrderId()] = $command->getProductName();
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}
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}
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Registering Query Handlers
Let's define
GetOrder Query that will find our placed order.1
class GetOrder
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{
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private string $orderId;
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​
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public function __construct(string $orderId)
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{
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$this->orderId = $orderId;
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}
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​
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public function getOrderId(): string
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{
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return $this->orderId;
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}
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}
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And
Query Handlerthat will handle this query1
use Ecotone\Modelling\Attribute\CommandHandler;
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use Ecotone\Modelling\Attribute\QueryHandler;
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​
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class OrderService
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{
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private array $orders;
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​
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#[CommandHandler]
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public function placeOrder(PlaceOrder $command) : void
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{
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$this->orders[$command->getOrderId()] = $command->getProductName();
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}
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​
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#[QueryHandler]
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public function getOrder(GetOrder $query) : string
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{
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if (!array_key_exists($query->getOrderId(), $this->orders)) {
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throw new \InvalidArgumentException("Order was not found " . $query->getOrderId());
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}
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​
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return $this->orders[$query->getOrderId()];
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}
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}
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Running The Example
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$commandBus->send(new PlaceOrder(1, "Milk"));
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​
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echo $queryBus->send(new GetOrder(1));
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Implementation Using Lite
Last modified 4mo ago
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