/usr/share/pyshared/pybridge/interfaces/observer.py is in pybridge-common 0.3.0-7.2.
This file is owned by root:root, with mode 0o644.
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# Copyright (C) 2004-2007 PyBridge Project.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
"""
Provides interfaces for the Observer Pattern.
For more information, see Gamma et al., "Design Patterns: Elements of Reusable
Object-Oriented Software", ISBN 0-201-63361-2.
"""
from zope.interface import Interface
class ISubject(Interface):
"""ISubject defines methods required for observation of an object."""
def attach(self, observer):
"""Add observer to list of observers.
@param observer: object implementing IListener.
"""
def detach(self, observer):
"""Remove observer from list of observers.
@param observer: object implementing IListener.
"""
def notify(self, event, *args, **kwargs):
"""Inform all observers that state has been changed by event.
@param event: the name of the event.
@type event: str
"""
class IListener(Interface):
"""IListener defines methods required by observers of an ISubject."""
def update(self, event, *args, **kwargs):
"""Called by ISubject being observed."""
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