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Introduction to services

A "service" (such as accessing the database, sending email, or translating user interface text) can be defined by a module or Drupal core. Defining a service means giving it a name and designating a default class to provide the service; ideally, there should also be an interface that defines the methods that may be called. Services are collected into the Dependency Injection Container, and can be overridden to use different classes or different instantiation by modules. See the Services and Dependency Injection Container topic for details.

Some services have tags, which are defined in the service definition. Tags are used to define a group of related services, or to specify some aspect of how the service behaves. See the Service Tags topic for more information.

See also

Services and Dependency Injection Container

Service Tags

Contains filters are case sensitive
Namesort descending File Class Tags
title_resolver core/core.services.yml Drupal\Core\Controller\TitleResolver
token core/core.services.yml Drupal\Core\Utility\Token
toolbar.menu_tree core/modules/toolbar/toolbar.services.yml Drupal\toolbar\Menu\ToolbarMenuLinkTree
toolbar.page_cache_request_policy.allow_toolbar_path core/modules/toolbar/toolbar.services.yml Drupal\toolbar\PageCache\AllowToolbarPath page_cache_request_policy
transliteration core/core.services.yml Drupal\Core\Transliteration\PhpTransliteration
twig core/core.services.yml Drupal\Core\Template\TwigEnvironment service_collector
twig.extension core/core.services.yml Drupal\Core\Template\TwigExtension twig.extension
twig.extension.debug core/core.services.yml Twig_Extension_Debug twig.extension
twig.loader core/core.services.yml Twig_Loader_Chain service_collector
twig.loader.filesystem core/core.services.yml Drupal\Core\Template\Loader\FilesystemLoader twig.loader
twig.loader.string core/core.services.yml Drupal\Core\Template\Loader\StringLoader twig.loader
twig.loader.theme_registry core/core.services.yml Drupal\Core\Template\Loader\ThemeRegistryLoader twig.loader
twig_extension_test.twig.test_extension core/modules/system/tests/modules/twig_extension_test/twig_extension_test.services.yml Drupal\twig_extension_test\TwigExtension\TestExtension twig.extension
twig_loader_test.twig.test_loader core/modules/system/tests/modules/twig_loader_test/twig_loader_test.services.yml Drupal\twig_loader_test\Loader\TestLoader twig.loader
typed_data_manager core/core.services.yml Drupal\Core\TypedData\TypedDataManager plugin_manager_cache_clear
unrouted_url_assembler core/core.services.yml Drupal\Core\Utility\UnroutedUrlAssembler
update.fetcher core/modules/update/update.services.yml Drupal\update\UpdateFetcher
update.manager core/modules/update/update.services.yml Drupal\update\UpdateManager
update.post_update_registry core/core.services.yml Drupal\Core\Update\UpdateRegistry
update.post_update_registry_factory core/core.services.yml Drupal\Core\Update\UpdateRegistryFactory
update.processor core/modules/update/update.services.yml Drupal\update\UpdateProcessor
update.root core/modules/update/update.services.yml SplString parameter_service
update.root.factory core/modules/update/update.services.yml Drupal\update\UpdateRootFactory
update_script_test.broken_path_processor core/modules/system/tests/modules/update_script_test/update_script_test.services.yml Drupal\update_script_test\PathProcessor\BrokenInboundPathProcessor path_processor_inbound
url_alter_test.path_processor core/modules/system/tests/modules/url_alter_test/url_alter_test.services.yml Drupal\url_alter_test\PathProcessorTest path_processor_inbound, path_processor_outbound
url_generator core/core.services.yml Drupal\Core\Render\MetadataBubblingUrlGenerator
url_generator.non_bubbling core/core.services.yml Drupal\Core\Routing\UrlGenerator
user.auth core/modules/user/user.services.yml Drupal\user\UserAuth
user.authentication.cookie core/modules/user/user.services.yml Drupal\user\Authentication\Provider\Cookie authentication_provider
user.current_user_context core/modules/user/user.services.yml Drupal\user\ContextProvider\CurrentUserContext context_provider
user.data core/modules/user/user.services.yml Drupal\user\UserData backend_overridable
user.permissions core/modules/user/user.services.yml Drupal\user\PermissionHandler
user.private_tempstore core/modules/user/user.services.yml Drupal\user\PrivateTempStoreFactory backend_overridable
user.shared_tempstore core/modules/user/user.services.yml Drupal\user\SharedTempStoreFactory backend_overridable
user_access_denied_subscriber core/modules/user/user.services.yml Drupal\user\EventSubscriber\AccessDeniedSubscriber event_subscriber
user_last_access_subscriber core/modules/user/user.services.yml Drupal\user\EventSubscriber\UserRequestSubscriber event_subscriber
user_maintenance_mode_subscriber core/modules/user/user.services.yml Drupal\user\EventSubscriber\MaintenanceModeSubscriber event_subscriber
user_permissions_hash_generator core/core.services.yml Drupal\Core\Session\PermissionsHashGenerator
uuid core/core.services.yml Drupal\Component\Uuid\Php
validation.constraint core/core.services.yml Drupal\Core\Validation\ConstraintManager plugin_manager_cache_clear
views.analyzer core/modules/views/views.services.yml Drupal\views\Analyzer
views.date_sql core/modules/views/views.services.yml Drupal\views\Plugin\views\query\MysqlDateSql backend_overridable
views.entity_schema_subscriber core/modules/views/views.services.yml Drupal\views\EventSubscriber\ViewsEntitySchemaSubscriber event_subscriber
views.executable core/modules/views/views.services.yml Drupal\views\ViewExecutableFactory
views.exposed_form_cache core/modules/views/views.services.yml Drupal\views\ExposedFormCache
views.route_subscriber core/modules/views/views.services.yml Drupal\views\EventSubscriber\RouteSubscriber event_subscriber
views.views_data core/modules/views/views.services.yml Drupal\views\ViewsData
views.views_data_helper core/modules/views/views.services.yml Drupal\views\ViewsDataHelper
workflows.access_check.delete_state core/modules/workflows/workflows.services.yml \Drupal\workflows\WorkflowDeleteAccessCheck access_check

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