Dependency Injection

Fusio uses a DI container to manage all internal services. In Fusio all services are defined in a simple PHP class so there is no yaml configuration. To define a custom service you need to create a container class i.e. at src/Dependency/Container.php. This class then needs to extend the Fusio container:

<?php

namespace App\Dependency;

use Fusio\Impl\Dependency\Container as FusioContainer;

class Container extends FusioContainer
{
    public function getMyService(): MyServiceInterface
    {
        return new MyService(
            $this->get('connector')->getConnection('System'),
            $this->get('engine_dispatcher')
        );
    }
}

In this example we simply define a new service. To use this container you need to create a new instance of this container at the container.php file.

<?php

$container = new Fusio\Impl\Dependency\Container();
$container->setParameter('config.file', __DIR__ . '/configuration.php');

return $container;

Then you can use the autowire feature of the DI container to receive the dependencies through constructor injection. In the following we create an action which automatically receives the MyServiceInterface based on the type-hint. It is important that the type-hint and the return type of the method at the DI container match.

<?php

namespace App\Action\Page;

use Fusio\Engine\ActionAbstract;
use Fusio\Engine\ContextInterface;
use Fusio\Engine\ParametersInterface;
use Fusio\Engine\RequestInterface;

class MyAction extends ActionAbstract
{
    private $myService;

    public function __construct(MyServiceInterface $myService)
    {
        $this->myService = $myService;
    }

    public function handle(RequestInterface $request, ParametersInterface $configuration, ContextInterface $context)
    {
        $body = [
            'result' => $this->myService->doStuff();
        ];

        return $this->response->build(200, [], $body);
    }
}

We have created also a sample project showing all best practices of Fusio at: https://github.com/apioo/fusio-sample-cms