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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import abc
class IObservable(abc.ABC):
""" Interface for objects that can emit notifications for the observer
system.
"""
def _notifiers(self, force_create):
""" Return a list of callables where each callable is a notifier.
The list is expected to be mutated for contributing or removing
notifiers from the object.
Parameters
----------
force_create: boolean
It is added for compatibility with CTrait.
It should not be used otherwise.
"""
raise NotImplementedError(
"Observable object must implement _notifiers")
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