RequestHandlerResolver.php

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<?php
namespace TYPO3\CMS\Extbase\Mvc;

class RequestHandlerResolver {

    protected $objectManager;

    protected $reflectionService;

    protected $configurationManager;

    public function resolveRequestHandler() {
        $availableRequestHandlerClassNames = $this->getRegisteredRequestHandlerClassNames();
        $suitableRequestHandlers = array();
        foreach ($availableRequestHandlerClassNames as $requestHandlerClassName) {
            $requestHandler = $this->objectManager->get($requestHandlerClassName);
            if ($requestHandler->canHandleRequest()) {
                $priority = $requestHandler->getPriority();
                if (isset($suitableRequestHandlers[$priority])) {
                    throw new \TYPO3\CMS\Extbase\Mvc\Exception('More than one request handler with the same priority can handle the request, but only one handler may be active at a time!', 1176475350);
                }
                $suitableRequestHandlers[$priority] = $requestHandler;
            }
        }
        if (count($suitableRequestHandlers) === 0) {
            throw new \TYPO3\CMS\Extbase\Mvc\Exception('No suitable request handler found.', 1205414233);
        }
        ksort($suitableRequestHandlers);
        return array_pop($suitableRequestHandlers);
    }

    public function getRegisteredRequestHandlerClassNames() {
        $settings = $this->configurationManager->getConfiguration(\TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface::CONFIGURATION_TYPE_FRAMEWORK);
        return is_array($settings['mvc']['requestHandlers']) ? $settings['mvc']['requestHandlers'] : array();
    }
}