Comment on page
CQRS PHP
Command Query Responsibility Segregation PHP
Let's create
PlaceOrder Command that will place an order in our system.class PlaceOrder
{
private string $orderId;
private string $productName;
public function __construct(string $orderId, string $productName)
{
$this->orderId = $orderId;
$this->productName = $productName;
}
public function getOrderId(): string
{
return $this->orderId;
}
public function getProductName(): string
{
return $this->productName;
}
}
And
Command Handler that will handle this Commanduse Ecotone\Modelling\Attribute\CommandHandler;
class OrderService
{
private array $orders;
#[CommandHandler]
public function placeOrder(PlaceOrder $command) : void
{
$this->orders[$command->getOrderId()] = $command->getProductName();
}
}
Let's define
GetOrder Query that will find our placed order.class GetOrder
{
private string $orderId;
public function __construct(string $orderId)
{
$this->orderId = $orderId;
}
public function getOrderId(): string
{
return $this->orderId;
}
}
And
Query Handlerthat will handle this queryuse Ecotone\Modelling\Attribute\CommandHandler;
use Ecotone\Modelling\Attribute\QueryHandler;
class OrderService
{
private array $orders;
#[CommandHandler]
public function placeOrder(PlaceOrder $command) : void
{
$this->orders[$command->getOrderId()] = $command->getProductName();
}
#[QueryHandler]
public function getOrder(GetOrder $query) : string
{
if (!array_key_exists($query->getOrderId(), $this->orders)) {
throw new \InvalidArgumentException("Order was not found " . $query->getOrderId());
}
return $this->orders[$query->getOrderId()];
}
}
$commandBus->send(new PlaceOrder(1, "Milk"));
echo $queryBus->send(new GetOrder(1));
Last modified 4mo ago