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<?php
declare(strict_types=1);
namespace Northwoods\Middleware;
use InvalidArgumentException;
use Psr\Container\ContainerInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\RequestHandlerInterface;
class LazyHandler implements RequestHandlerInterface
{
/** @var ContainerInterface */
private $container;
/** @var string */
private $handler;
public function __construct(ContainerInterface $container, string $handler)
if (! is_subclass_of($handler, RequestHandlerInterface::class, true)) {
throw new InvalidArgumentException(
sprintf('%s does not implement %s', $handler, RequestHandlerInterface::class)
);
}
$this->container = $container;
$this->handler = $handler;
// RequestHandlerInterface
public function handle(ServerRequestInterface $request): ResponseInterface
return $this->resolve()->handle($request);
private function resolve(): RequestHandlerInterface
return $this->container->get($this->handler);
northwoods /
lazy-middleware
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