class Drupal

Static Service Container wrapper.

Generally, code in Drupal should accept its dependencies via either constructor injection or setter method injection. However, there are cases, particularly in legacy procedural code, where that is infeasible. This class acts as a unified global accessor to arbitrary services within the system in order to ease the transition from procedural code to injected OO code.

The container is built by the kernel and passed in to this class which stores it statically. The container always contains the services from \Drupal\Core\CoreBundle, the bundles of enabled modules and any other bundles defined in $GLOBALS['conf']['container_bundles'].

This class exists only to support legacy code that cannot be dependency injected. If your code needs it, consider refactoring it to be object oriented, if possible. When this is not possible, for instance in the case of hook implementations, and your code is more than a few non-reusable lines, it is recommended to instantiate an object implementing the actual logic.

// Legacy procedural code.
function hook_do_stuff() {
  $lock = lock()
    ->acquire('stuff_lock');

  // ...
}

// Correct procedural code.
function hook_do_stuff() {
  $lock = Drupal::lock()
    ->acquire('stuff_lock');

  // ...
}

// The preferred way: dependency injected code.
function hook_do_stuff() {

  // Move the actual implementation to a class and instantiate it.
  $instance = new StuffDoingClass(Drupal::lock());
  $instance
    ->doStuff();

  // Or, even better, rely on the service container to avoid hard coding a
  // specific interface implementation, so that the actual logic can be
  // swapped. This might not always make sense, but in general it is a good
  // practice.
  Drupal::service('stuff.doing')
    ->doStuff();
}
interface StuffDoingInterface {
  public function doStuff();

}
class StuffDoingClass implements StuffDoingInterface {
  protected $lockBackend;
  public function __construct(LockBackendInterface $lockBackend) {
    $this->lockBackend = $lockBackend;
  }
  public function doStuff() {
    $lock = $this->lockBackend
      ->acquire('stuff_lock');

    // ...
  }

}

Hierarchy

Expanded class hierarchy of Drupal

See also

\Drupal\Core\DrupalKernel

4 files declare their use of Drupal
Field.php in drupal/core/modules/field/lib/Drupal/field/Field.php
Contains \Drupal\field\Field.
Locale.php in drupal/core/modules/locale/lib/Drupal/locale/Locale.php
Contains \Drupal\locale\Locale.
ViewExecutable.php in drupal/core/modules/views/lib/Drupal/views/ViewExecutable.php
Definition of Drupal\views\ViewExecutable.
Views.php in drupal/core/modules/views/lib/Drupal/views/Views.php
Contains \Drupal\views\Views.
17 string references to 'Drupal'
common_test_drupal_alter_alter in drupal/core/modules/system/tests/modules/common_test/common_test.module
Implements hook_TYPE_alter().
ConfigSchemaTest::testSchemaData in drupal/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php
Tests metadata applied to configuration objects.
drupal_mail in drupal/core/includes/mail.inc
Composes and optionally sends an e-mail message.
hook_requirements in drupal/core/modules/system/system.api.php
Check installation requirements and do status reporting.
install_profile_info in drupal/core/includes/install.inc
Retrieves information about an installation profile from its .info.yml file.

... See full list

File

drupal/core/lib/Drupal.php, line 77
Contains Drupal.

View source
class Drupal {

  /**
   * The currently active container object.
   *
   * @var \Symfony\Component\DependencyInjection\ContainerInterface
   */
  protected static $container;

  /**
   * Sets a new global container.
   *
   * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
   *   A new container instance to replace the current.
   */
  public static function setContainer(ContainerInterface $container) {
    static::$container = $container;
  }

  /**
   * Returns the currently active global container.
   *
   * @deprecated This method is only useful for the testing environment, and as
   *   a BC shiv for drupal_container(). It should not be used otherwise.
   *
   * @return \Symfony\Component\DependencyInjection\ContainerInterface
   */
  public static function getContainer() {
    return static::$container;
  }

  /**
   * Retrieves a service from the container.
   *
   * Use this method if the desired service is not one of those with a dedicated
   * accessor method below. If it is listed below, those methods are preferred
   * as they can return useful type hints.
   *
   * @param string $id
   *   The ID of the service to retrieve.
   * @return mixed
   *   The specified service.
   */
  public static function service($id) {
    return static::$container
      ->get($id);
  }

  /**
   * Retrieves the currently active request object.
   *
   * Note: The use of this wrapper in particular is especially discouraged. Most
   * code should not need to access the request directly.  Doing so means it
   * will only function when handling an HTTP request, and will require special
   * modification or wrapping when run from a command line tool, from certain
   * queue processors, or from automated tests.
   *
   * If code must access the request, it is considerably better to register
   * an object with the Service Container and give it a setRequest() method
   * that is configured to run when the service is created.  That way, the
   * correct request object can always be provided by the container and the
   * service can still be unit tested.
   *
   * If this method must be used, never save the request object that is
   * returned.  Doing so may lead to inconsistencies as the request object is
   * volatile and may change at various times, such as during a subrequest.
   *
   * @return \Symfony\Component\HttpFoundation\Request
   *   The currently active request object.
   */
  public static function request() {
    return static::$container
      ->get('request');
  }

  /**
   * Retrieves the entity manager service.
   *
   * @return \Drupal\Core\Entity\EntityManager
   *   The entity manager service.
   */
  public static function entityManager() {
    return static::$container
      ->get('plugin.manager.entity');
  }

  /**
   * Returns the current primary database.
   *
   * @return \Drupal\Core\Database\Connection
   *   The current active database's master connection.
   */
  public static function database() {
    return static::$container
      ->get('database');
  }

  /**
   * Returns the requested cache bin.
   *
   * @param string $bin
   *   (optional) The cache bin for which the cache object should be returned,
   *   defaults to 'cache'.
   *
   * @return \Drupal\Core\Cache\CacheBackendInterface
   *   The cache object associated with the specified bin.
   */
  public static function cache($bin = 'cache') {
    return static::$container
      ->get('cache.' . $bin);
  }

  /**
   * Returns an expirable key value store collection.
   *
   * @param string $collection
   *   The name of the collection holding key and value pairs.
   *
   * @return \Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface
   *   An expirable key value store collection.
   */
  public static function keyValueExpirable($collection) {
    return static::$container
      ->get('keyvalue.expirable')
      ->get($collection);
  }

  /**
   * Returns the locking layer instance.
   *
   * @return \Drupal\Core\Lock\LockBackendInterface
   */
  public static function lock() {
    return static::$container
      ->get('lock');
  }

  /**
   * Retrieves a configuration object.
   *
   * This is the main entry point to the configuration API. Calling
   * @code Drupal::config('book.admin') @endcode will return a configuration
   * object in which the book module can store its administrative settings.
   *
   * @param string $name
   *   The name of the configuration object to retrieve. The name corresponds to
   *   a configuration file. For @code config('book.admin') @endcode, the config
   *   object returned will contain the contents of book.admin configuration file.
   *
   * @return \Drupal\Core\Config\Config
   *   A configuration object.
   */
  public static function config($name) {
    return static::$container
      ->get('config.factory')
      ->get($name);
  }

  /**
   * Returns a queue for the given queue name.
   *
   * The following variables can be set by variable_set or $conf overrides:
   * - queue_class_$name: The class to be used for the queue $name.
   * - queue_default_class: The class to use when queue_class_$name is not
   *   defined. Defaults to \Drupal\Core\Queue\System, a reliable backend using
   *   SQL.
   * - queue_default_reliable_class: The class to use when queue_class_$name is
   *   not defined and the queue_default_class is not reliable. Defaults to
   *   \Drupal\Core\Queue\System.
   *
   * @param string $name
   *   The name of the queue to work with.
   * @param bool $reliable
   *   (optional) TRUE if the ordering of items and guaranteeing every item
   *   executes at least once is important, FALSE if scalability is the main
   *   concern. Defaults to FALSE.
   *
   * @return \Drupal\Core\Queue\QueueInterface
   *   The queue object for a given name.
   */
  public static function queue($name, $reliable = FALSE) {
    return static::$container
      ->get('queue')
      ->get($name, $reliable);
  }

  /**
   * Returns a key/value storage collection.
   *
   * @param $collection
   *   Name of the key/value collection to return.
   *
   * @return \Drupal\Core\KeyValueStore\KeyValueStoreInterface
   */
  public static function keyValue($collection) {
    return static::$container
      ->get('keyvalue')
      ->get($collection);
  }

  /**
   * Returns the state storage service.
   *
   * Use this to store machine-generated data, local to a specific environment
   * that does not need deploying and does not need human editing; for example,
   * the last time cron was run. Data which needs to be edited by humans and
   * needs to be the same across development, production, etc. environments
   * (for example, the system maintenance message) should use config() instead.
   *
   * @return \Drupal\Core\KeyValueStore\KeyValueStoreInterface
   */
  public static function state() {
    return static::$container
      ->get('state');
  }

  /**
   * Returns the default http client.
   *
   * @return \Guzzle\Http\ClientInterface
   *   A guzzle http client instance.
   */
  public static function httpClient() {
    return static::$container
      ->get('http_default_client');
  }

  /**
   * Returns the entity query object for this entity type.
   *
   * @param string $entity_type
   *   The entity type, e.g. node, for which the query object should be
   *   returned.
   * @param string $conjunction
   *   AND if all conditions in the query need to apply, OR if any of them is
   *   enough. Optional, defaults to AND.
   *
   * @return \Drupal\Core\Entity\Query\QueryInterface
   *   The query object that can query the given entity type.
   */
  public static function entityQuery($entity_type, $conjunction = 'AND') {
    return static::$container
      ->get('entity.query')
      ->get($entity_type, $conjunction);
  }

  /**
   * Returns the entity query aggregate object for this entity type.
   *
   * @param $entity_type
   *   The entity type, e.g. node, for which the query object should be
   *   returned.
   * @param $conjunction
   *   AND if all conditions in the query need to apply, OR if any of them is
   *   enough. Optional, defaults to AND.
   *
   * @return \Drupal\Core\Entity\Query\QueryInterface
   *   The query object that can query the given entity type.
   */
  public static function entityQueryAggregate($entity_type, $conjunction = 'AND') {
    return static::$container
      ->get('entity.query')
      ->getAggregate($entity_type, $conjunction);
  }

  /**
   * Returns the flood instance.
   *
   * @return \Drupal\Core\Flood\FloodInterface
   */
  public static function flood() {
    return static::$container
      ->get('flood');
  }

  /**
   * Returns the module handler.
   *
   * @return \Drupal\Core\Extension\ModuleHandler
   */
  public static function moduleHandler() {
    return static::$container
      ->get('module_handler');
  }

  /**
   * Returns the typed data manager service.
   *
   * Use the typed data manager service for creating typed data objects.
   *
   * @return \Drupal\Core\TypedData\TypedDataManager
   *   The typed data manager.
   *
   * @see \Drupal\Core\TypedData\TypedDataManager::create()
   */
  public static function typedData() {
    return static::$container
      ->get('typed_data');
  }

  /**
   * Returns the token service.
   *
   * @return \Drupal\Core\Utility\Token
   *   The token service.
   */
  public static function token() {
    return static::$container
      ->get('token');
  }

  /**
   * Returns the url generator service.
   *
   * @return \Drupal\Core\Routing\UrlGenerator
   *   The url generator service.
   */
  public static function urlGenerator() {
    return static::$container
      ->get('url_generator');
  }

  /**
   * Returns the string translation service.
   *
   * @return \Drupal\Core\Translation\TranslationManager
   *   The string translation manager.
   */
  public static function translation() {
    return static::$container
      ->get('string_translation');
  }

}

Members

Namesort descending Modifiers Type Description Overrides
Drupal::$container protected static property The currently active container object.
Drupal::cache public static function Returns the requested cache bin.
Drupal::config public static function Retrieves a configuration object.
Drupal::database public static function Returns the current primary database.
Drupal::entityManager public static function Retrieves the entity manager service.
Drupal::entityQuery public static function Returns the entity query object for this entity type.
Drupal::entityQueryAggregate public static function Returns the entity query aggregate object for this entity type.
Drupal::flood public static function Returns the flood instance.
Drupal::getContainer Deprecated public static function Returns the currently active global container.
Drupal::httpClient public static function Returns the default http client.
Drupal::keyValue public static function Returns a key/value storage collection.
Drupal::keyValueExpirable public static function Returns an expirable key value store collection.
Drupal::lock public static function Returns the locking layer instance.
Drupal::moduleHandler public static function Returns the module handler.
Drupal::queue public static function Returns a queue for the given queue name.
Drupal::request public static function Retrieves the currently active request object.
Drupal::service public static function Retrieves a service from the container.
Drupal::setContainer public static function Sets a new global container.
Drupal::state public static function Returns the state storage service.
Drupal::token public static function Returns the token service.
Drupal::translation public static function Returns the string translation service.
Drupal::typedData public static function Returns the typed data manager service.
Drupal::urlGenerator public static function Returns the url generator service.