dreamtime.py

Sun, 28 Jan 2018 11:38:01 +0000

author
Tuomo Valkonen <tuomov@iki.fi>
date
Sun, 28 Jan 2018 11:38:01 +0000
changeset 79
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parent 78
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permissions
-rw-r--r--

Cleaned up module organisation to simplify borgend.py and not have to import it in other modules.

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1 #
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2 # Wake/sleep detection for scheduling adjustments
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3 #
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4
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5 import Foundation
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6 import AppKit
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7 import platform
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8 import time
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9 import threading
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10 import weakref
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11 import datetime
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12 import loggers
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13
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14 logger=loggers.get(__name__)
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15
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16 _dreamtime_monitor=None
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17
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18 #
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19 # Support classes for dealing with different times
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20 #
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21
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22 # Return difference (delay) of "dreamtime" to monotonic time
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23 def dreamtime_difference():
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24 if _dreamtime_monitor:
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25 return _dreamtime_monitor.diff()
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26 else:
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27 return time.monotonic()
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28
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29 # Return "dreamtime"
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30 def dreamtime():
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31 return max(0, time.monotonic()-dreamtime_difference())
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32
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33 class Time:
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34 def realtime(self):
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35 raise NotImplementedError
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36
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37 def monotonic(self):
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38 raise NotImplementedError
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39
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40 @staticmethod
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41 def _now():
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42 raise NotImplementedError
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43
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44 @classmethod
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45 def now(cls):
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46 return cls(cls._now())
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47
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48 @classmethod
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49 def from_realtime(cls, realtime):
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50 return cls(realtime-time.time()+cls._now())
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51
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52 @classmethod
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53 def from_monotonic(cls, monotonic):
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54 return cls(monotonic-time.monotonic()+cls._now())
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55
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56 @classmethod
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57 def after(cls, seconds):
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58 return cls(cls._now()+seconds)
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59
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60 def datetime(self):
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61 return datetime.datetime.fromtimestamp(self.realtime())
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62
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63 def seconds_to(self):
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64 return self._value-self._now()
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65
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66 def __lt__(self, other):
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67 return self.monotonic() < other.monotonic()
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69 def __gt__(self, other):
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70 return self.monotonic() > other.monotonic()
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71
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72 def __le__(self, other):
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73 return self.monotonic() <= other.monotonic()
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74
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75 def __ge__(self, other):
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76 return self.monotonic() >= other.monotonic()
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77
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78 def __eq__(self, other):
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79 return self.monotonic() == other.realtime()
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80
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81 class RealTime(Time):
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82 def __init__(self, when):
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83 self._value=when
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84
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85 def realtime(self):
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86 return self._value
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87
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88 def monotonic(self):
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89 return self._value+(time.monotonic()-time.time())
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90
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91 @staticmethod
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92 def _now():
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93 return time.time()
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94
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95 class MonotonicTime(Time):
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96 def __init__(self, when):
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97 self._value=when
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98
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99 def realtime(self):
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100 return self._value+(time.time()-time.monotonic())
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101
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102 def monotonic(self):
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103 return self._value
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104
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105 @staticmethod
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106 def _now():
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107 return time.monotonic()
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108
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109 class DreamTime(Time):
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110 def __init__(self, when):
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111 self._value=when
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112
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113 def realtime(self):
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114 return self._value+(time.time()-dreamtime())
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115
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116 # Important: monotonic is "static" within a wakeup period
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117 # and does not need to call time.monotonic(), as it gets compared
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118 # to a specific time.monotonic() realisation
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119 def monotonic(self):
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120 return self._value+dreamtime_difference()
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121
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122 @staticmethod
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123 def _now():
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124 return dreamtime()
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125
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126 #
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127 # Wake up / sleep handling
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128 #
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129
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130 class SleepHandler(Foundation.NSObject):
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131 """ Handle wake/sleep notifications """
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132
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133 def init(self):
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134 self.__sleeptime=None
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135 self.__slept=0
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136 self.__epoch=time.monotonic()
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137 self.__lock=threading.Lock()
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138 self.__callbacks=weakref.WeakKeyDictionary()
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139
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140 return self
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141
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142 def handleSleepNotification_(self, aNotification):
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143 logger.info("System going to sleep")
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144 now=time.monotonic()
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145 with self.__lock:
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146 self.__sleeptime=now
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147
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148 def handleWakeNotification_(self, aNotification):
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149 logger.info("System waking up from sleep")
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150 try:
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151 now=time.monotonic()
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152 with self.__lock:
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153 if self.__sleeptime:
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154 slept=max(0, now-self.__sleeptime)
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155 logger.info("Slept %f seconds" % slept)
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156 self.__slept=self.__slept+slept
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157 self.__sleeptime=None
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158 callbacks=self.__callbacks.copy()
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159 except:
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160 logger.exception("Bug in wakeup handler")
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161
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162 for callback in callbacks.values():
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163 try:
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164 callback()
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165 except Exception:
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166 logger.exception("Error in wake notification callback")
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167
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168 # Return difference to time.monotonic()
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169 def diff(self):
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170 with self.__lock:
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171 diff=self.__epoch+self.__slept
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172 return diff
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173
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174 # Weirdo (Py)ObjC naming to stop it form choking up
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175 def addForObj_aCallback_(self, obj, callback):
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176 with self.__lock:
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177 self.__callbacks[obj]=callback
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178
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179 # obj is to use a a key in a weak key dictionary
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180 def add_callback(obj, callback):
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181 global _dreamtime_monitor
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182
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183 monitor=_dreamtime_monitor
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184 if not monitor:
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185 raise Exception("Dreamtime monitor not started")
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186 else:
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187 monitor.addForObj_aCallback_(obj, callback)
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188
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189 def start_monitoring():
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190 global _dreamtime_monitor
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191
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192 if platform.system()=='Darwin':
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193 logger.debug("Starting to monitor system sleep")
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194 workspace = AppKit.NSWorkspace.sharedWorkspace()
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195 notification_center = workspace.notificationCenter()
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196 _dreamtime_monitor = SleepHandler.new()
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197
76
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198 notification_center.addObserver_selector_name_object_(
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199 _dreamtime_monitor,
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200 "handleSleepNotification:",
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201 AppKit.NSWorkspaceWillSleepNotification,
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202 None)
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203
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204 notification_center.addObserver_selector_name_object_(
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205 _dreamtime_monitor,
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206 "handleWakeNotification:",
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207 AppKit.NSWorkspaceDidWakeNotification,
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208 None)
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209 else:
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210 logger.warning(("No system sleep monitor implemented for '%s'"
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211 % platform.system()))
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diff changeset
212

mercurial