A container for all session instances.
Clears a session instance for name.
Clears a session instance with the type T.
Finds a session name for the specified type or fails if it's not found.
Gets a session instance for name
Gets a session instance with the type T.
Gets or generates a new session instance using generator with the type T (or name if specified)
Sets a new session instance with name.
Sets a session instance with the type T.