Service-related API

This section describes the methods of the TYPO3 CMS core that are related to the use of services.

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility

This extension management class contains three methods related to services:

addService

This method is used to register services with TYPO3 CMS. It checks for availability of a service with regards to OS dependency (if any) and fills the $GLOBALS['T3_SERVICES'] array, where information about all registered services is kept.

findService

This method is used to find the appropriate service given a type and a subtype. It handles priority and quality rankings. It also checks for availability based on executables dependencies, if any.

This method is normally called by \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstanceService(), so you shouldn’t have to worry about calling it directly, but it can be useful to check if there’s at least one service available.

deactivateService

Marks a service as unavailable. It is called internally by addService() and findService() and should probably not be called directly unless you’re sure of what you’re doing.

\TYPO3\CMS\Core\Utility\GeneralUtility

This class contains a single method related to services, but the most useful one, used to get an instance of a service.

makeInstanceService

This method is used to get an instance of a service class of a given type and subtype. It calls on \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::findService() to find the best possible service (in terms of priority and quality).

As described above it keeps a registry of all instantiated service classes and uses existing instances whenever possible, in effect turning service classes into singletons.