Application.php

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<?php
namespace Magento\Setup;

use Zend\Mvc\Application as ZendApplication;
use Zend\Mvc\Service\ServiceManagerConfig;
use Zend\ServiceManager\ServiceManager;

class Application
{
    public function bootstrap(array $configuration)
    {
        $managerConfig = isset($configuration['service_manager']) ? $configuration['service_manager'] : [];
        $managerConfig = new ServiceManagerConfig($managerConfig);

        $serviceManager = new ServiceManager();
        $managerConfig->configureServiceManager($serviceManager);
        $serviceManager->setService('ApplicationConfig', $configuration);

        $serviceManager->get('ModuleManager')->loadModules();

        // load specific services
        if (!empty($configuration['required_services'])) {
            $this->loadServices($serviceManager, $configuration['required_services']);
        }

        $listeners = $this->getListeners($serviceManager, $configuration);
        $application = new ZendApplication(
            $configuration,
            $serviceManager,
            $serviceManager->get('EventManager'),
            $serviceManager->get('Request'),
            $serviceManager->get('Response')
        );
        $application->bootstrap($listeners);
        return $application;
    }

    private function loadServices(ServiceManager $serviceManager, array $services)
    {
        foreach ($services as $serviceName) {
            $serviceManager->get($serviceName);
        }
    }

    private function getListeners(ServiceManager $serviceManager, array $configuration)
    {
        $appConfigListeners = isset($configuration['listeners']) ? $configuration['listeners'] : [];
        $config = $serviceManager->get('config');
        $serviceConfigListeners = isset($config['listeners']) ? $config['listeners'] : [];

        return array_unique(array_merge($serviceConfigListeners, $appConfigListeners));
    }
}