CQRS PHP

Command Query Responsibility Segregation PHP

Demo

https://github.com/ecotoneframework/quickstart-examples/tree/main/CQRS

Read Blog Post

Read Blog Post about CQRS in PHP and Ecotone

Code Example

Registering Command Handlers

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 Command

use Ecotone\Modelling\Attribute\CommandHandler;

class OrderService
{
    private array $orders;

    #[CommandHandler]
    public function placeOrder(PlaceOrder $command) : void
    {
        $this->orders[$command->getOrderId()] = $command->getProductName();
    }
}

Registering Query Handlers

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 query

use 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()];
    }
}

Running The Example

$commandBus->send(new PlaceOrder(1, "Milk"));

echo $queryBus->send(new GetOrder(1));