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MediaWikiServicesHook.php
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MediaWikiServicesHook.php
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<?php
namespace MediaWiki\Hook;
use MediaWiki\MediaWikiServices;
/**
* This is a hook handler interface, see docs/Hooks.md.
* Use the hook name "MediaWikiServices" to register handlers implementing this interface.
*
* @warning Implementations of this interface must not have services injected into
* their constructor! This is because this hook runs while the service container is
* still being initialized, so any services it asks for might get instantiated based on
* incomplete configuration and wiring.
*
* @stable to implement
* @ingroup Hooks
*/
interface MediaWikiServicesHook {
/**
* This hook is called when a global MediaWikiServices instance is initialized.
* Extensions may use this to define, replace, or wrap services. However, the
* preferred way to define a new service is the $wgServiceWiringFiles array.
*
* Global configuration variables are safe to change at this point. All other hooks
* run after some of those variables have been copied during service initialization
* already, so variable changes in those hooks might have no effect or lead to
* inconsistencies.
*
* @warning Implementations must not immediately access services instances from the
* service container $services, since the service container is not fully initialized
* at the time when the hook is called. However, callbacks that are used as service
* instantiators or service manipulators may access service instances.
*
* As an exception from the above, the following services are safe to access:
* - MainConfig and ConfigFactory;
* - HookContainer (but all hooks run inside a MediaWikiServices hook handler MUST
* use the 'noServices' option);
* - extension services that have explicitly been documented as safe, and follow the
* same rules in their service wiring logic.
*
* Example:
* @code
* function onMediaWikiServices( $services ) {
* // The service wiring and configuration in $services may be incomplete at this time,
* // do not access services yet!
* // At this point, we can only manipulate the wiring, not use it!
*
* $services->defineService(
* 'MyCoolService',
* function( MediaWikiServices $container ) {
* // It's ok to access services inside this callback, since the
* // service container will be fully initialized when it is called!
* return new MyCoolService( $container->getPageLookup() );
* }
* );
*
* $services->addServiceManipulator(
* 'SlotRoleRegistry',
* function ( SlotRoleRegistry $service, MediaWikiServices $container ) {
* // ...
* }
* );
*
* $services->redefineService(
* 'StatsdDataFactory',
* function ( MediaWikiServices $container ) {
* // ...
* }
* );
* }
* @endcode
*
* @since 1.35
*
* @param MediaWikiServices $services
* @return bool|void True or no return value to continue or false to abort
*/
public function onMediaWikiServices( $services );
}

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