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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

Namesort ascending File Class Tags
pgsql.workspaces.entity.query.sql core/modules/workspaces/workspaces.services.yml Drupal\workspaces\EntityQuery\PgsqlQueryFactory
pgsql.views.date_sql core/modules/views/views.services.yml Drupal\views\Plugin\views\query\PostgresqlDateSql
pgsql.entity.query.sql core/core.services.yml Drupal\Core\Entity\Query\Sql\pgsql\QueryFactory
permission_checker core/core.services.yml Drupal\Core\Session\PermissionChecker
performance_test.cache_tags.invalidator.checksum core/modules/system/tests/modules/performance_test/performance_test.services.yml Drupal\performance_test\Cache\CacheTagsChecksumDecorator
performance_test.cache_factory core/modules/system/tests/modules/performance_test/performance_test.services.yml Drupal\performance_test\Cache\CacheFactoryDecorator
path_processor_manager core/core.services.yml Drupal\Core\PathProcessor\PathProcessorManager service_collector
path_processor_front core/core.services.yml Drupal\Core\PathProcessor\PathProcessorFront path_processor_inbound
path_processor_decode core/core.services.yml Drupal\Core\PathProcessor\PathProcessorDecode path_processor_inbound
path_processor.image_styles core/modules/image/image.services.yml Drupal\image\PathProcessor\PathProcessorImageStyles path_processor_inbound
path_processor.files core/modules/system/system.services.yml Drupal\system\PathProcessor\PathProcessorFiles path_processor_inbound
path_alias.whitelist core/modules/path_alias/path_alias.services.yml Drupal\path_alias\AliasWhitelist needs_destruction
path_alias.subscriber core/modules/path_alias/path_alias.services.yml Drupal\path_alias\EventSubscriber\PathAliasSubscriber
path_alias.repository core/modules/path_alias/path_alias.services.yml Drupal\path_alias\AliasRepository backend_overridable
path_alias.path_processor core/modules/path_alias/path_alias.services.yml Drupal\path_alias\PathProcessor\AliasPathProcessor path_processor_inbound, path_processor_outbound
path_alias.manager core/modules/path_alias/path_alias.services.yml Drupal\path_alias\AliasManager
path.validator core/core.services.yml Drupal\Core\Path\PathValidator
path.matcher core/core.services.yml Drupal\Core\Path\PathMatcher
path.current core/core.services.yml Drupal\Core\Path\CurrentPathStack
password_generator core/core.services.yml Drupal\Core\Password\DefaultPasswordGenerator
password core/modules/user/tests/modules/user_custom_pass_hash_params_test/user_custom_pass_hash_params_test.services.yml Drupal\Core\Password\PhpPassword
password core/core.services.yml Drupal\Core\Password\PhpPassword
paramconverter_subscriber core/core.services.yml Drupal\Core\EventSubscriber\ParamConverterSubscriber
paramconverter_manager core/core.services.yml Drupal\Core\ParamConverter\ParamConverterManager service_collector
paramconverter.views_ui core/modules/views_ui/views_ui.services.yml Drupal\views_ui\ParamConverter\ViewUIConverter paramconverter
paramconverter.menu_link core/core.services.yml Drupal\Core\ParamConverter\MenuLinkPluginConverter paramconverter
paramconverter.jsonapi.resource_type core/modules/jsonapi/jsonapi.services.yml Drupal\jsonapi\ParamConverter\ResourceTypeConverter paramconverter
paramconverter.jsonapi.entity_uuid core/modules/jsonapi/jsonapi.services.yml Drupal\jsonapi\ParamConverter\EntityUuidConverter paramconverter
paramconverter.entity_revision core/core.services.yml Drupal\Core\ParamConverter\EntityRevisionParamConverter paramconverter
paramconverter.entity core/core.services.yml Drupal\Core\ParamConverter\EntityConverter paramconverter
paramconverter.configentity_admin core/core.services.yml Drupal\Core\ParamConverter\AdminPathConfigEntityConverter paramconverter
page_cache_response_policy core/core.services.yml Drupal\Core\PageCache\ChainResponsePolicy service_collector
page_cache_request_policy core/core.services.yml Drupal\Core\PageCache\DefaultRequestPolicy service_collector
page_cache_no_server_error core/core.services.yml Drupal\Core\PageCache\ResponsePolicy\NoServerError page_cache_response_policy, dynamic_page_cache_response_policy
page_cache_no_cache_routes core/core.services.yml Drupal\Core\PageCache\ResponsePolicy\DenyNoCacheRoutes page_cache_response_policy, dynamic_page_cache_response_policy
page_cache_kill_switch core/core.services.yml Drupal\Core\PageCache\ResponsePolicy\KillSwitch page_cache_response_policy, dynamic_page_cache_response_policy
pager.parameters core/core.services.yml Drupal\Core\Pager\PagerParameters
pager.manager core/core.services.yml Drupal\Core\Pager\PagerManager
options_request_listener core/core.services.yml Drupal\Core\EventSubscriber\OptionsRequestSubscriber
node_preview core/modules/node/node.services.yml Drupal\node\ParamConverter\NodePreviewConverter paramconverter
node.route_subscriber core/modules/node/node.services.yml Drupal\node\Routing\RouteSubscriber
node.page_cache_response_policy.deny_node_preview core/modules/node/node.services.yml Drupal\node\PageCache\DenyNodePreview page_cache_response_policy, dynamic_page_cache_response_policy
node.node_route_context core/modules/node/node.services.yml Drupal\node\ContextProvider\NodeRouteContext context_provider
node.grant_storage core/modules/node/node.services.yml Drupal\node\NodeGrantDatabaseStorage backend_overridable
node.admin_path.route_subscriber core/modules/node/node.services.yml Drupal\node\EventSubscriber\NodeAdminRouteSubscriber
new_dependency_test_with_service.service core/modules/system/tests/modules/new_dependency_test_with_service/new_dependency_test_with_service.services.yml Drupal\new_dependency_test_with_service\NewService
new_dependency_test.setter_injection core/modules/system/tests/modules/new_dependency_test/new_dependency_test.services.yml Drupal\new_dependency_test\SetterInjection
new_dependency_test.recursion core/modules/system/tests/modules/new_dependency_test/new_dependency_test.services.yml Drupal\new_dependency_test\ServiceWithDependency
new_dependency_test.optional_dependency core/modules/system/tests/modules/new_dependency_test/new_dependency_test.services.yml Drupal\new_dependency_test\ServiceWithDependency
new_dependency_test.hard_dependency core/modules/system/tests/modules/new_dependency_test/new_dependency_test.services.yml Drupal\new_dependency_test\ServiceWithDependency

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