observable.py
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#!/usr/bin/env python
###############################################################################
# mjc-broker #
# observable.py #
# #
# (C) 2016 David Zhong #
# #
# Permission is hereby granted, free of charge, to any person obtaining a #
# copy of this software and associated documentation files (the "Software"), #
# to deal in the Software without restriction, including without limitation #
# the rights to use, copy, modify, merge, publish, distribute, sublicense, #
# and/or sell copies of the Software, and to permit persons to whom the #
# Software is furnished to do so, subject to the following conditions: #
# #
# The above copyright notice and this permission notice shall be included in #
# all copies or substantial portions of the Software. #
# #
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR #
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, #
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE #
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER #
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING #
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER #
# DEALINGS IN THE SOFTWARE. #
###############################################################################
try:
import wx
except:
pass
class Observable(object):
def __init__(self):
self.__subscribers = {None: []}
def subscribe(self, handler, topic=None):
assert(callable(handler))
if topic not in self.__subscribers:
self.__subscribers[topic] = []
if handler not in self.__subscribers[topic]:
self.__subscribers[topic].append(handler)
def unsubscribe(self, handler, topic=None):
if topic in self.__subscribers and handler in self.__subscribers[topic]:
self.__subscribers[topic].remove(handler)
def _sendMessage(self, topic, message):
subscribers = [x for x in self.__subscribers[None]]
if topic in self.__subscribers:
[subscribers.append(x) for x in self.__subscribers[topic] if x not in subscribers]
for handler in subscribers:
try:
wx.CallAfter(handler, topic, message)
except (NameError, AssertionError):
handler(topic, message)