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/vendor/symfony/dependency-injection/ -> ServiceSubscriberInterface.php (source)

   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\DependencyInjection;
  13  
  14  /**
  15   * A ServiceSubscriber exposes its dependencies via the static {@link getSubscribedServices} method.
  16   *
  17   * The getSubscribedServices method returns an array of service types required by such instances,
  18   * optionally keyed by the service names used internally. Service types that start with an interrogation
  19   * mark "?" are optional, while the other ones are mandatory service dependencies.
  20   *
  21   * The injected service locators SHOULD NOT allow access to any other services not specified by the method.
  22   *
  23   * It is expected that ServiceSubscriber instances consume PSR-11-based service locators internally.
  24   * This interface does not dictate any injection method for these service locators, although constructor
  25   * injection is recommended.
  26   *
  27   * @author Nicolas Grekas <p@tchwork.com>
  28   */
  29  interface ServiceSubscriberInterface
  30  {
  31      /**
  32       * Returns an array of service types required by such instances, optionally keyed by the service names used internally.
  33       *
  34       * For mandatory dependencies:
  35       *
  36       *  * ['logger' => 'Psr\Log\LoggerInterface'] means the objects use the "logger" name
  37       *    internally to fetch a service which must implement Psr\Log\LoggerInterface.
  38       *  * ['Psr\Log\LoggerInterface'] is a shortcut for
  39       *  * ['Psr\Log\LoggerInterface' => 'Psr\Log\LoggerInterface']
  40       *
  41       * otherwise:
  42       *
  43       *  * ['logger' => '?Psr\Log\LoggerInterface'] denotes an optional dependency
  44       *  * ['?Psr\Log\LoggerInterface'] is a shortcut for
  45       *  * ['Psr\Log\LoggerInterface' => '?Psr\Log\LoggerInterface']
  46       *
  47       * @return array The required service types, optionally keyed by service names
  48       */
  49      public static function getSubscribedServices();
  50  }


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