Manager Pattern: (Bonus pattern) Manages multiple entities of the same or similar type.
Unlike the factory patterns which handle object creation or the mediator pattern which handles interaction between related objects, the manager pattern has the role of managing multiple identical or related objects.
For example in the Python standard library the Manager object
in the multiprocessing library manages shared objects and child processes.
It keeps track of the running processes, shared objects and the available methods
on those objects. Without a Manager object, multiple processes could try to access
or modify shared objects at the same time with unpredictable results.
It uses the Proxy design pattern, providing a proxy to the shared objects, to help
achieve this, passing messages and data across process boundaries.