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<?php |
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/** |
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* GpsLab component. |
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* |
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* @author Peter Gribanov <[email protected]> |
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* @copyright Copyright (c) 2011, Peter Gribanov |
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* @license http://opensource.org/licenses/MIT |
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*/ |
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namespace GpsLab\Component\Middleware\Chain; |
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use GpsLab\Component\Middleware\Middleware; |
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use Psr\Container\ContainerInterface; |
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class ContainerMiddlewareChain implements MiddlewareChain |
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{ |
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/** |
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* @var ContainerInterface |
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*/ |
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private $container; |
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/** |
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* @var string[] |
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*/ |
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private $middleware_ids = []; |
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/** |
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* @param ContainerInterface $container |
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*/ |
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public function __construct(ContainerInterface $container) |
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{ |
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$this->container = $container; |
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} |
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/** |
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* @param string $service |
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*/ |
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public function registerService($service) |
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{ |
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$index = array_search($service, $this->middleware_ids); |
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// move existing middleware to end of chain |
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if ($index !== false) { |
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unset($this->middleware_ids[$index]); |
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// correct array indexes |
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$this->middleware_ids = array_values($this->middleware_ids); |
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} |
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$this->middleware_ids[] = $service; |
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} |
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/** |
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* @param mixed $message |
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* |
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* @return mixed |
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*/ |
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public function run($message) |
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{ |
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return call_user_func($this->call(0), $message); |
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} |
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/** |
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* @param int $index |
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* |
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* @return callable |
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*/ |
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private function call($index) |
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{ |
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$middleware = $this->lazyLoad($index); |
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if (!($middleware instanceof Middleware)) { |
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return function ($message) { |
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return $message; |
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}; |
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} |
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return function ($message) use ($middleware, $index) { |
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return $middleware->handle($message, $this->call($index + 1)); |
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}; |
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} |
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/** |
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* @param $index |
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* |
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* @return Middleware |
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*/ |
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private function lazyLoad($index) |
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{ |
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if (isset($this->middleware_ids[$index])) { |
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$middleware = $this->container->get($this->middleware_ids[$index]); |
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if ($middleware instanceof Middleware) { |
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return $middleware; |
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} |
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} |
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return null; |
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} |
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} |
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gpslab /
middleware
