Singleton

Singleton helpers and boilerplate

class orion.core.utils.singleton.AbstractSingletonType(name, bases, namespace, **kwargs)

This will create singleton base classes, that need to be subclassed and implemented.

exception orion.core.utils.singleton.SingletonAlreadyInstantiatedError(name)

Exception to be raised when someone provides arguments to build an object from a already-instantiated SingletonType class.

class orion.core.utils.singleton.SingletonFactory(name, bases, namespace, **kwargs)

Wrapping orion.core.utils.Factory with SingletonType. Keep compatibility with AbstractSingletonType.

exception orion.core.utils.singleton.SingletonNotInstantiatedError(name)

Exception to be raised when someone try to access an instance of a singleton that has not been instantiated yet

class orion.core.utils.singleton.SingletonType(name, bases, dictionary)

Metaclass that implements the singleton pattern for a Python class.

Methods

__call__(*args, **kwargs)

Create an object if does not already exist, otherwise return what there is.

__call__(*args, **kwargs)

Create an object if does not already exist, otherwise return what there is.

orion.core.utils.singleton.update_singletons(values=None)

Replace singletons by given values and return previous singleton objects