Symfony\Component\DependencyInjection\Definition::setShared PHP Method

    public function setShared($shared)
    {
        $this->shared = (bool) $shared;

        return $this;
    }

 public function load(array $configs, ContainerBuilder $container)
 {
     $loader = new YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
     $loader->load('services.yml');
     $config = array();
     foreach ($configs as $subConfig) {
         $config = array_merge($config, $subConfig);
     }
     foreach ($config['email'] as $alias => $options) {
         $optionId = sprintf('rage_notification.email.%s.message', $alias);
         $optionDef = new Definition($container->getParameter('rage_notification.email_message.class'));
         $optionDef->setShared(false);
         $optionDef->addArgument(new Reference('mailer'));
         $optionDef->addArgument(new Reference('templating'));
         if (!empty($options['from'])) {
             $optionDef->addMethodCall('setFrom', [$options['from']]);
         }
         if (!empty($options['reply_to'])) {
             $optionDef->addMethodCall('setReplyTo', [$options['reply_to']]);
         }
         if (!empty($options['embed_images'])) {
             $optionDef->addMethodCall('setEmbedImages', [$options['embed_images']['url'], $options['embed_images']['path']]);
         }
         if (!empty($options['template_path'])) {
             $optionDef->addMethodCall('setTemplatePath', [$options['template_path']]);
         }
         if (!empty($options['css_file'])) {
             $optionDef->addMethodCall('setCssFile', [$options['css_file']]);
         }
         $container->setDefinition($optionId, $optionDef);
         if ($alias === 'default') {
             $container->setAlias('rage_notification.email.message', $optionId);
         }
     }
 }