Mercurial > pylearn

annotate doc/v2_planning/plugin.py @ 1263:10113a1050ce

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author Pascal Lamblin <lamblinp@iro.umontreal.ca>
date Tue, 28 Sep 2010 16:27:21 -0400
parents a1957faecc9b
children
rev   line source
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1
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2 import time
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3 from collections import defaultdict, deque
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4 from copy import copy
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5
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6 inf = float('inf')
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7
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8 #############
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9 ### EVENT ###
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10 #############
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11
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12 class Event(object):
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13
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14 def __init__(self, type, **attributes):
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15 self.type = type
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16 self.__dict__.update(attributes)
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17 self.attributes = dict(type = type, **attributes)
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18
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19 def match(self, other):
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20 if isinstance(other, Matcher):
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21 return other(self)
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22 else:
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23 oattr = other.attributes
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24 for k, v in self.attributes.iteritems():
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25 if k in oattr:
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26 v2 = oattr[k]
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27 if isinstance(v2, Matcher):
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28 if not v2(v): return False
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29 else:
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30 if v != v2: return False
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31 return True
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32
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33 def __str__(self):
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34 return "Event(%s)" % ", ".join("%s=%s" % (k, v) for k, v in self.attributes.iteritems())
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35
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36 class Matcher(object):
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37
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38 def __call__(self, object):
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39 raise NotImplementedError("Implement this!")
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40
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41 class FnMatcher(Matcher):
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42
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43 def __init__(self, function):
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44 self.function = function
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45
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46 def __call__(self, object):
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47 return self.function(object)
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48
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49 all_events = FnMatcher(lambda _: True)
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50
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51
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52
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53 ################
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54 ### SCHEDULE ###
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55 ################
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56
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57 class Schedule(Matcher):
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58 def __add__(self, i):
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59 return OffsetSchedule(self, i)
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60 def __or__(self, s):
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61 return UnionSchedule(self, to_schedule(s))
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62 def __and__(self, s):
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63 return IntersectionSchedule(self, to_schedule(s))
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64 def __sub__(self, i):
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65 return OffsetSchedule(self, -i)
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66 def __ror__(self, s):
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67 return UnionSchedule(to_schedule(s), self)
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68 def __rand__(self, s):
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69 return IntersectionSchedule(to_schedule(s), self)
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70 def __invert__(self):
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71 return NegatedSchedule(self)
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72
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73 def to_schedule(x):
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74 if x in (None, False):
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75 return never
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76 if x is True:
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77 return always
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78 elif isinstance(x, (list, tuple)):
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79 return reduce(UnionSchedule, x)
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80 else:
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81 return x
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82
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83
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84 class ScheduleMix(Schedule):
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85 __n__ = None
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86 def __init__(self, *subschedules):
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87 assert (not self.__n__) or len(subschedules) == self.__n__
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88 self.subschedules = map(to_schedule, subschedules)
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89
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90 class UnionSchedule(ScheduleMix):
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91 def __call__(self, time):
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92 return any(s(time) for s in self.subschedules)
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93
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94 class IntersectionSchedule(ScheduleMix):
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95 def __call__(self, time):
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96 return all(s(time) for s in self.subschedules)
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97
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98 class DifferenceSchedule(ScheduleMix):
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99 __n__ = 2
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100 def __call__(self, time):
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101 return self.subschedules[0](time) and not self.subschedules[1](time)
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102
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103 class NegatedSchedule(ScheduleMix):
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104 __n__ = 1
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105 def __call__(self, time):
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106 return not self.subschedules[0](time)
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107
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108 class OffsetSchedule(Schedule):
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109 def __init__(self, schedule, offset):
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110 self.schedule = schedule
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111 self.offset = offset
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112 def __call__(self, time):
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113 if isinstance(time, int):
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114 return self.schedule(time - self.offset)
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115 else:
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116 t1, t2 = time
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117 return self.schedule((t1 - self.offset, t2 - self.offset))
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118
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119
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120 class AlwaysSchedule(Schedule):
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121 def __call__(self, time):
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122 return True
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123
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124 always = AlwaysSchedule()
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125 never = ~always
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126
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127 class IntervalSchedule(Schedule):
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128 def __init__(self, step, repeat = inf):
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129 self.step = step
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130 self.upper_bound = step * (repeat - 1)
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131 def __call__(self, time):
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132 if isinstance(time, int):
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133 if time < 0 or time > self.upper_bound:
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134 return False
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135 return time % self.step == 0
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136 else:
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137 t1, t2 = time
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138 if t2 < 0 or t1 > self.upper_bound:
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139 return False
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140 diff = t2 - t1
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141 t1m = t1 % self.step
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142 t2m = t2 % self.step
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143 return (diff >= self.step
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144 or t1m == 0
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145 or t2m == 0
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146 or t1m > t2m)
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147
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148 each = lambda step, repeat = inf: each0(step, repeat) + step
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149 each0 = IntervalSchedule
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150
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151
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152 class RangeSchedule(Schedule):
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153 def __init__(self, low = None, high = None):
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154 self.low = low or -inf
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155 self.high = high or inf
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156 def __call__(self, time):
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157 if isinstance(time, int):
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158 return self.low <= time <= self.high
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159 else:
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160 t1, t2 = time
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161 return self.low <= t1 <= self.high \
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162 or self.low <= t2 <= self.high
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163
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164 inrange = RangeSchedule
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165
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166
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167 class ListSchedule(Schedule):
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168 def __init__(self, *schedules):
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169 self.schedules = schedules
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170 def __call__(self, time):
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171 if isinstance(time, int):
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172 return time in self.schedules
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173 else:
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174 for t in self.schedules:
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175 if t1 <= t <= t2:
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176 return True
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177 return False
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178
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179 at = ListSchedule
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180
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181
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182 ##############
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183 ### PLUGIN ###
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184 ##############
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185
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186 class Plugin(object):
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187
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188 def attach(self, scheduler):
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189 c = copy(self)
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190 c.scheduler = scheduler
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191 return c
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192
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193 def __call__(self, event):
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194 raise NotImplementedError("Implement this!")
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195
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196 def fire(self, type, **attributes):
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197 event = Event(type, issuer = self, **attributes)
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198 self.scheduler.queue(event)
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199
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200 class FnPlugin(Plugin):
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201
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202 def __init__(self, function):
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203 self.function = function
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204
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205 def __call__(self, event):
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206 return self.function(self, event)
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207
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208 class DispatchPlugin(Plugin):
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209
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210 def __call__(self, event):
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211 getattr(self, "on_" + event.type, self.generic)(event)
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212
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213 def generic(self, event):
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214 return
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215
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216
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217 #################
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218 ### SCHEDULER ###
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219 #################
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220
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221 class Scheduler(object):
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222
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223 def __init__(self):
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224 self.plugins = []
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225 self.categorized = defaultdict(list)
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226 self.event_queue = deque()
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227
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228 def __call__(self):
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229 i = 0
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230 evq = self.event_queue
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231 self.queue(Event("begin", issuer = self))
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232 while True:
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233 self.queue(Event("tick", issuer = self, time = i))
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234 while evq:
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235 event = evq.popleft()
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236 candidates = self.categorized[event.type] + self.categorized[None]
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237 for event_template, plugin in candidates:
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238 if event.match(event_template):
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239 plugin(event) # note: the plugin might queue more events
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240 if event.type == "terminate":
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241 return
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242 i += 1
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243
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244 def schedule_plugin(self, event_template, plugin):
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245 plugin = plugin.attach(self)
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246 if isinstance(event_template, Matcher) or isinstance(event_template.type, Matcher):
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247 # These plugins may execute upon any event type
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248 self.categorized[None].append((event_template, plugin))
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249 else:
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250 self.categorized[event_template.type].append((event_template, plugin))
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251 self.plugins.append((event_template, plugin))
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252
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253 def queue(self, event):
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254 self.event_queue.append(event)
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255
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256
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257
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258
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259 @FnPlugin
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260 def printer(self, event):
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261 print event
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262
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263 @FnPlugin
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264 def stopper(self, event):
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265 self.fire("terminate")
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266
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267 @FnPlugin
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268 def byebye(self, event):
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269 print "bye bye!"
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270
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271
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272 @FnPlugin
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273 def waiter(self, event):
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274 time.sleep(0.1)
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275
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276 # @FnPlugin
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277 # def timer(self, event):
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278 # if not hasattr(self, 'previous'):
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279 # self.beginning = time.time()
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280 # self.previous = 0
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281 # now = time.time() - self.beginning
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282 # inow = int(now)
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283 # if inow > self.previous:
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284 # self.fire("second", time = inow)
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285 # self.previous = now
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286
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287 class Timer(DispatchPlugin):
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288
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289 def on_begin(self, event):
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290 self.beginning = time.time()
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291 self.previous = 0
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292
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293 def on_tick(self, event):
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294 now = time.time() - self.beginning
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295 inow = int(now)
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296 if inow > self.previous:
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297 self.fire("second", time = inow)
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298 self.previous = now
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301
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302 sch = Scheduler()
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304
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305 sch.schedule_plugin(all_events, Timer())
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306 sch.schedule_plugin(Event("tick"), waiter) # this means: execute the waiter plugin (a delay) on every "tick" event. Is it confusing to use Event(...)?
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307 sch.schedule_plugin(Event("second"), printer)
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308
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309 # sch.schedule_plugin(all_events, printer)
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310
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311 sch.schedule_plugin(Event("tick", time = at(100)), stopper)
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312 sch.schedule_plugin(Event("terminate"), byebye)
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313
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314 sch()