def register_singleton(self, service_subject, identifier=None):
"""
Register a new singleton service in in the dependency injector
This service can be :
* A class that will be instantiated when called
* An already instantiated instance that will be returned
If no identifier is passed, it will be the class name in snake_case
:param service_subject: The class or instance
:type service_subject: mixed
:param identifier: The identifier used to later retrieve a service singleton
:type identifier: string
:return: Return the newly created dependency entry
:rtype: Service
"""
if identifier is None:
identifier = get_service_subject_identifier(service_subject)
service = Service(service_subject)
service.is_singleton = True
self._services[identifier] = service
self._logger.debug(
"Class %s registered as singleton with identifier %s",
str(service_subject), identifier)
return service
def test_is_singleton(self):
service = Service(Mock())
service.is_singleton = True
self.assertTrue(service.is_singleton)
def _register_singleton(self):
fake_service = Service(Mock)
fake_service.is_singleton = True
self.injector._services['fake_service'] = fake_service