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: / opt / psa / admin / plib / modules / monitoring / vendor / laminas / laminas-stratigility / src /
Filename : Next.php
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<?php

declare (strict_types=1);
namespace PleskMonitoring\Laminas\Stratigility;

use PleskMonitoring\Laminas\Stratigility\Exception\MiddlewarePipeNextHandlerAlreadyCalledException;
use PleskMonitoring\Psr\Http\Message\ResponseInterface;
use PleskMonitoring\Psr\Http\Message\ServerRequestInterface;
use PleskMonitoring\Psr\Http\Server\RequestHandlerInterface;
use SplQueue;
/**
 * Iterate a queue of middlewares and execute them.
 */
final class Next implements RequestHandlerInterface
{
    private RequestHandlerInterface $fallbackHandler;
    private ?SplQueue $queue;
    /**
     * Clones the queue provided to allow re-use.
     *
     * @param RequestHandlerInterface $fallbackHandler Fallback handler to
     *     invoke when the queue is exhausted.
     */
    public function __construct(SplQueue $queue, RequestHandlerInterface $fallbackHandler)
    {
        $this->queue = clone $queue;
        $this->fallbackHandler = $fallbackHandler;
    }
    public function handle(ServerRequestInterface $request) : ResponseInterface
    {
        if ($this->queue === null) {
            throw MiddlewarePipeNextHandlerAlreadyCalledException::create();
        }
        if ($this->queue->isEmpty()) {
            $this->queue = null;
            return $this->fallbackHandler->handle($request);
        }
        $middleware = $this->queue->dequeue();
        $next = clone $this;
        // deep clone is not used intentionally
        $this->queue = null;
        // mark queue as processed at this nesting level
        return $middleware->process($request, $next);
    }
}