= Core/Domain API

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The core/domain APIs provide general-purpose services to the domain objects, for example obtaining the current time or user, or instantiating domain objects.

.Core/Domain Layer API
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|===

|API
|Description


|xref:refguide:applib:index/services/clock/ClockService.adoc[ClockService]
|Access the current time (and for testing, allow the time to be changed)


|xref:refguide:applib:index/services/confview/ConfigurationViewService.adoc[ConfigurationViewService] & xref:refguide:applib:index/services/confview/ConfigurationMenu.adoc[ConfigurationMenu]
|Backing service which creates the list of configuration properties for xref:refguide:applib:index/services/confview/ConfigurationMenu.adoc[ConfigurationMenu].


|xref:refguide:applib:index/services/eventbus/EventBusService.adoc[EventBusService]
|Programmatically post events to the internal event bus.
Also used by Apache Isis itself to broadcast domain, UI and lifecycle events.


|xref:refguide:applib:index/services/factory/FactoryService.adoc[FactoryService]
|Methods to instantiate and initialize domain objects

|xref:refguide:applib:index/services/i18n/LanguageProvider.adoc[LanguageProvider]
|Obtain the preferred language of the current user.

|xref:refguide:applib:index/services/locale/LocaleChoiceProvider.adoc[LocaleChoiceProvider]
|Provides a list of the available locales.

Used by the framework itself, eg to prompt the list of locales when a user logs in through the xref:vw:ROOT:about.adoc[Wicket viewer].

|xref:refguide:applib:index/services/scratchpad/Scratchpad.adoc[Scratchpad]
|Request-scoped service for interchanging information between and aggregating over multiple method calls.


|xref:refguide:applib:index/services/inject/ServiceInjector.adoc[ServiceInjector]
|Programmatically inject services into arbitrary objects.


|xref:refguide:applib:index/services/registry/ServiceRegistry.adoc[ServiceRegistry]
|Registry of all domain services, for service locator pattern.


|xref:refguide:applib:index/services/user/UserService.adoc[UserService] and xref:refguide:applib:index/services/userui/UserMenu.adoc[UserMenu]
|Methods to access the currently-logged on user.




|===

