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<?php declare(strict_types=1);
namespace Igni\Http\Middleware;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\RequestHandlerInterface;
use SplQueue;
/**
* Iterates a queue of middleware and executes them.
*/
final class Next implements RequestHandlerInterface
{
* @var RequestHandlerInterface
private $parent;
* @var SplQueue
private $queue;
* Next constructor.
* @param SplQueue $queue
* @param RequestHandlerInterface $parent
public function __construct(SplQueue $queue, RequestHandlerInterface $parent)
$this->queue = clone $queue;
$this->parent = $parent;
}
public function __invoke(ServerRequestInterface $request): ResponseInterface
return $this->handle($request);
public function handle(ServerRequestInterface $request): ResponseInterface
if ($this->queue->isEmpty()) {
return $this->parent->handle($request);
$middleware = $this->queue->dequeue();
return $middleware->process($request, $this);
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