Chris@14: <?php
Chris@14: 
Chris@14: /*
Chris@14:  * This file is part of the Symfony package.
Chris@14:  *
Chris@14:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@14:  *
Chris@14:  * For the full copyright and license information, please view the LICENSE
Chris@14:  * file that was distributed with this source code.
Chris@14:  */
Chris@14: 
Chris@14: namespace Symfony\Component\DependencyInjection;
Chris@14: 
Chris@14: /**
Chris@14:  * A ServiceSubscriber exposes its dependencies via the static {@link getSubscribedServices} method.
Chris@14:  *
Chris@14:  * The getSubscribedServices method returns an array of service types required by such instances,
Chris@14:  * optionally keyed by the service names used internally. Service types that start with an interrogation
Chris@14:  * mark "?" are optional, while the other ones are mandatory service dependencies.
Chris@14:  *
Chris@14:  * The injected service locators SHOULD NOT allow access to any other services not specified by the method.
Chris@14:  *
Chris@14:  * It is expected that ServiceSubscriber instances consume PSR-11-based service locators internally.
Chris@14:  * This interface does not dictate any injection method for these service locators, although constructor
Chris@14:  * injection is recommended.
Chris@14:  *
Chris@14:  * @author Nicolas Grekas <p@tchwork.com>
Chris@14:  */
Chris@14: interface ServiceSubscriberInterface
Chris@14: {
Chris@14:     /**
Chris@14:      * Returns an array of service types required by such instances, optionally keyed by the service names used internally.
Chris@14:      *
Chris@14:      * For mandatory dependencies:
Chris@14:      *
Chris@17:      *  * ['logger' => 'Psr\Log\LoggerInterface'] means the objects use the "logger" name
Chris@14:      *    internally to fetch a service which must implement Psr\Log\LoggerInterface.
Chris@17:      *  * ['Psr\Log\LoggerInterface'] is a shortcut for
Chris@17:      *  * ['Psr\Log\LoggerInterface' => 'Psr\Log\LoggerInterface']
Chris@14:      *
Chris@14:      * otherwise:
Chris@14:      *
Chris@17:      *  * ['logger' => '?Psr\Log\LoggerInterface'] denotes an optional dependency
Chris@17:      *  * ['?Psr\Log\LoggerInterface'] is a shortcut for
Chris@17:      *  * ['Psr\Log\LoggerInterface' => '?Psr\Log\LoggerInterface']
Chris@14:      *
Chris@14:      * @return array The required service types, optionally keyed by service names
Chris@14:      */
Chris@14:     public static function getSubscribedServices();
Chris@14: }