Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/repoze/lru/__init__.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 """ LRU caching class and decorator """
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2 from abc import abstractmethod
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3 from abc import ABCMeta
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4
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5 import threading
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6 import time
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7 import uuid
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8
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9
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10 _MARKER = object()
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11 # By default, expire items after 2**60 seconds. This fits into 64 bit
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12 # integers and is close enough to "never" for practical purposes.
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13 _DEFAULT_TIMEOUT = 2 ** 60
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14
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15
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16 class Cache(object):
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17 __metaclass__ = ABCMeta
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18
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19 @abstractmethod
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20 def clear(self):
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21 """Remove all entries from the cache"""
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22
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23 @abstractmethod
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24 def get(self, key, default=None):
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25 """Return value for key. If not in cache, return default"""
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26
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27 @abstractmethod
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28 def put(self, key, val):
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29 """Add key to the cache with value val"""
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30
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31 @abstractmethod
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32 def invalidate(self, key):
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33 """Remove key from the cache"""
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34
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35
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36 class UnboundedCache(Cache):
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37 """
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38 a simple unbounded cache backed by a dictionary
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39 """
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40
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41 def __init__(self):
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42 self._data = dict()
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43
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44 def get(self, key, default=None):
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45 return self._data.get(key, default)
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46
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47 def clear(self):
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48 self._data.clear()
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49
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50 def invalidate(self, key):
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51 try:
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52 del self._data[key]
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53 except KeyError:
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54 pass
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55
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56 def put(self, key, val):
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57 self._data[key] = val
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58
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59
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60 class LRUCache(Cache):
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61 """ Implements a pseudo-LRU algorithm (CLOCK)
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62
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63 The Clock algorithm is not kept strictly to improve performance, e.g. to
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64 allow get() and invalidate() to work without acquiring the lock.
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65 """
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66 def __init__(self, size):
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67 size = int(size)
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68 if size < 1:
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69 raise ValueError('size must be >0')
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70 self.size = size
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71 self.lock = threading.Lock()
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72 self.hand = 0
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73 self.maxpos = size - 1
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74 self.clock_keys = None
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75 self.clock_refs = None
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76 self.data = None
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77 self.evictions = 0
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78 self.hits = 0
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79 self.misses = 0
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80 self.lookups = 0
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81 self.clear()
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82
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83 def clear(self):
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84 """Remove all entries from the cache"""
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85 with self.lock:
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86 # If really clear()ing a full cache, clean up self.data first to
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87 # give garbage collection a chance to reduce memorey usage.
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88 # Instantiating "[_MARKER] * size" will temporarily have 2 lists
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89 # in memory -> high peak memory usage for tiny amount of time.
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90 # With self.data already clear, that peak should not exceed what
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91 # we normally use.
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92 self.data = {}
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93 size = self.size
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94 self.clock_keys = [_MARKER] * size
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95 self.clock_refs = [False] * size
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96 self.hand = 0
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97 self.evictions = 0
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98 self.hits = 0
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99 self.misses = 0
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100 self.lookups = 0
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101
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102 def get(self, key, default=None):
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103 """Return value for key. If not in cache, return default"""
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104 self.lookups += 1
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105 try:
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106 pos, val = self.data[key]
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107 self.hits += 1
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108 except KeyError:
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109 self.misses += 1
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110 return default
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111 self.clock_refs[pos] = True
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112 return val
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113
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114 def put(self, key, val):
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115 """Add key to the cache with value val"""
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116 # These do not change or they are just references, no need for locking.
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117 maxpos = self.maxpos
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118 clock_refs = self.clock_refs
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119 clock_keys = self.clock_keys
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120 data = self.data
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121
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122 with self.lock:
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123 entry = data.get(key)
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124 if entry is not None:
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125 # We already have key. Only make sure data is up to date and
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126 # to remember that it was used.
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127 pos, old_val = entry
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128 if old_val is not val:
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129 data[key] = (pos, val)
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130 self.clock_refs[pos] = True
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131 return
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132 # else: key is not yet in cache. Search place to insert it.
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133
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134 hand = self.hand
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135 count = 0
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136 max_count = 107
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137 while 1:
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138 ref = clock_refs[hand]
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139 if ref == True:
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140 clock_refs[hand] = False
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141 hand += 1
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142 if hand > maxpos:
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143 hand = 0
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144
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145 count += 1
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146 if count >= max_count:
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147 # We have been searching long enough. Force eviction of
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148 # next entry, no matter what its status is.
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149 clock_refs[hand] = False
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150 else:
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151 oldkey = clock_keys[hand]
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152 # Maybe oldkey was not in self.data to begin with. If it
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153 # was, self.invalidate() in another thread might have
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154 # already removed it. del() would raise KeyError, so pop().
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155 oldentry = data.pop(oldkey, _MARKER)
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156 if oldentry is not _MARKER:
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157 self.evictions += 1
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158 clock_keys[hand] = key
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159 clock_refs[hand] = True
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160 data[key] = (hand, val)
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161 hand += 1
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162 if hand > maxpos:
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163 hand = 0
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164 self.hand = hand
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165 break
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166
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167 def invalidate(self, key):
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168 """Remove key from the cache"""
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169 # pop with default arg will not raise KeyError
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170 entry = self.data.pop(key, _MARKER)
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171 if entry is not _MARKER:
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172 # We have no lock, but worst thing that can happen is that we
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173 # set another key's entry to False.
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174 self.clock_refs[entry[0]] = False
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175 # else: key was not in cache. Nothing to do.
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176
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177
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178 class ExpiringLRUCache(Cache):
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179 """ Implements a pseudo-LRU algorithm (CLOCK) with expiration times
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180
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181 The Clock algorithm is not kept strictly to improve performance, e.g. to
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182 allow get() and invalidate() to work without acquiring the lock.
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183 """
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184 def __init__(self, size, default_timeout=_DEFAULT_TIMEOUT):
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185 self.default_timeout = default_timeout
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186 size = int(size)
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187 if size < 1:
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188 raise ValueError('size must be >0')
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189 self.size = size
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190 self.lock = threading.Lock()
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191 self.hand = 0
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192 self.maxpos = size - 1
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193 self.clock_keys = None
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194 self.clock_refs = None
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195 self.data = None
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196 self.evictions = 0
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197 self.hits = 0
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198 self.misses = 0
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199 self.lookups = 0
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200 self.clear()
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201
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202 def clear(self):
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203 """Remove all entries from the cache"""
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204 with self.lock:
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205 # If really clear()ing a full cache, clean up self.data first to
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206 # give garbage collection a chance to reduce memorey usage.
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207 # Instantiating "[_MARKER] * size" will temporarily have 2 lists
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208 # in memory -> high peak memory usage for tiny amount of time.
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209 # With self.data already clear, that peak should not exceed what
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210 # we normally use.
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211 # self.data contains (pos, val, expires) triplets
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212 self.data = {}
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213 size = self.size
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214 self.clock_keys = [_MARKER] * size
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215 self.clock_refs = [False] * size
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216 self.hand = 0
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217 self.evictions = 0
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218 self.hits = 0
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219 self.misses = 0
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220 self.lookups = 0
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221
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222 def get(self, key, default=None):
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223 """Return value for key. If not in cache or expired, return default"""
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224 self.lookups += 1
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225 try:
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226 pos, val, expires = self.data[key]
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227 except KeyError:
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228 self.misses += 1
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229 return default
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230 if expires > time.time():
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231 # cache entry still valid
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232 self.hits += 1
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233 self.clock_refs[pos] = True
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234 return val
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235 else:
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236 # cache entry has expired. Make sure the space in the cache can
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237 # be recycled soon.
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238 self.misses += 1
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239 self.clock_refs[pos] = False
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240 return default
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241
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242 def put(self, key, val, timeout=None):
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243 """Add key to the cache with value val
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244
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245 key will expire in $timeout seconds. If key is already in cache, val
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246 and timeout will be updated.
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247 """
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248 # These do not change or they are just references, no need for locking.
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249 maxpos = self.maxpos
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250 clock_refs = self.clock_refs
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251 clock_keys = self.clock_keys
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252 data = self.data
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253 lock = self.lock
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254 if timeout is None:
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255 timeout = self.default_timeout
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256
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257 with self.lock:
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258 entry = data.get(key)
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259 if entry is not None:
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260 # We already have key. Only make sure data is up to date and
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261 # to remember that it was used.
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262 pos = entry[0]
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263 data[key] = (pos, val, time.time() + timeout)
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264 clock_refs[pos] = True
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265 return
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266 # else: key is not yet in cache. Search place to insert it.
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267
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268 hand = self.hand
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269 count = 0
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270 max_count = 107
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271 while 1:
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272 ref = clock_refs[hand]
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273 if ref == True:
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274 clock_refs[hand] = False
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275 hand += 1
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276 if hand > maxpos:
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277 hand = 0
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278
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279 count += 1
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280 if count >= max_count:
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281 # We have been searching long enough. Force eviction of
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282 # next entry, no matter what its status is.
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283 clock_refs[hand] = False
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284 else:
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285 oldkey = clock_keys[hand]
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286 # Maybe oldkey was not in self.data to begin with. If it
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287 # was, self.invalidate() in another thread might have
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288 # already removed it. del() would raise KeyError, so pop().
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289 oldentry = data.pop(oldkey, _MARKER)
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290 if oldentry is not _MARKER:
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291 self.evictions += 1
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292 clock_keys[hand] = key
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293 clock_refs[hand] = True
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294 data[key] = (hand, val, time.time() + timeout)
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295 hand += 1
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296 if hand > maxpos:
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297 hand = 0
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298 self.hand = hand
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299 break
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300
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301 def invalidate(self, key):
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302 """Remove key from the cache"""
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303 # pop with default arg will not raise KeyError
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304 entry = self.data.pop(key, _MARKER)
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305 if entry is not _MARKER:
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306 # We have no lock, but worst thing that can happen is that we
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307 # set another key's entry to False.
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308 self.clock_refs[entry[0]] = False
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309 # else: key was not in cache. Nothing to do.
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310
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311
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312 class lru_cache(object):
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313 """ Decorator for LRU-cached function
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314
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315 timeout parameter specifies after how many seconds a cached entry should
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316 be considered invalid.
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317 """
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318 def __init__(self,
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319 maxsize,
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320 cache=None, # cache is an arg to serve tests
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321 timeout=None,
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322 ignore_unhashable_args=False):
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323 if cache is None:
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324 if maxsize is None:
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325 cache = UnboundedCache()
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326 elif timeout is None:
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327 cache = LRUCache(maxsize)
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328 else:
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329 cache = ExpiringLRUCache(maxsize, default_timeout=timeout)
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330 self.cache = cache
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331 self._ignore_unhashable_args = ignore_unhashable_args
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332
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333 def __call__(self, func):
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334 cache = self.cache
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335 marker = _MARKER
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336
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337 def cached_wrapper(*args, **kwargs):
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338 try:
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339 key = (args, frozenset(kwargs.items())) if kwargs else args
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340 except TypeError as e:
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341 if self._ignore_unhashable_args:
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342 return func(*args, **kwargs)
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343 else:
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344 raise e
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345 else:
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346 val = cache.get(key, marker)
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347 if val is marker:
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348 val = func(*args, **kwargs)
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349 cache.put(key, val)
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350 return val
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351
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352 def _maybe_copy(source, target, attr):
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353 value = getattr(source, attr, source)
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354 if value is not source:
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355 setattr(target, attr, value)
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356
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357 _maybe_copy(func, cached_wrapper, '__module__')
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358 _maybe_copy(func, cached_wrapper, '__name__')
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359 _maybe_copy(func, cached_wrapper, '__doc__')
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360 cached_wrapper._cache = cache
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361 return cached_wrapper
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362
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363
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364 class CacheMaker(object):
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365 """Generates decorators that can be cleared later
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366 """
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367 def __init__(self, maxsize=None, timeout=_DEFAULT_TIMEOUT):
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368 """Create cache decorator factory.
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369
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370 - maxsize : the default size for created caches.
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371
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372 - timeout : the defaut expiraiton time for created caches.
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373 """
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374 self._maxsize = maxsize
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375 self._timeout = timeout
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376 self._cache = {}
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377
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378 def _resolve_setting(self, name=None, maxsize=None, timeout=None):
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379 if name is None:
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380 while True:
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381 name = str(uuid.uuid4())
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382 ## the probability of collision is so low ....
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383 if name not in self._cache: # pragma: NO COVER
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384 break
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385
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386 if name in self._cache:
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387 raise KeyError("cache %s already in use" % name)
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388
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389 if maxsize is None:
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390 maxsize = self._maxsize
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391
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392 if maxsize is None:
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393 raise ValueError("Cache must have a maxsize set")
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394
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395 if timeout is None:
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396 timeout = self._timeout
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397
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398 return name, maxsize, timeout
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399
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400 def memoized(self, name=None):
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401 name, maxsize, _ = self._resolve_setting(name, 0)
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402 cache = self._cache[name] = UnboundedCache()
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403 return lru_cache(None, cache)
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404
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405 def lrucache(self, name=None, maxsize=None):
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406 """Named arguments:
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407
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408 - name (optional) is a string, and should be unique amongst all caches
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409
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410 - maxsize (optional) is an int, overriding any default value set by
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411 the constructor
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412 """
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413 name, maxsize, _ = self._resolve_setting(name, maxsize)
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414 cache = self._cache[name] = LRUCache(maxsize)
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415 return lru_cache(maxsize, cache)
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416
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417 def expiring_lrucache(self, name=None, maxsize=None, timeout=None):
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418 """Named arguments:
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419
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420 - name (optional) is a string, and should be unique amongst all caches
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421
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422 - maxsize (optional) is an int, overriding any default value set by
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423 the constructor
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424
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425 - timeout (optional) is an int, overriding any default value set by
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426 the constructor or the default value (%d seconds)
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427 """ % _DEFAULT_TIMEOUT
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428 name, maxsize, timeout = self._resolve_setting(name, maxsize, timeout)
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429 cache = self._cache[name] = ExpiringLRUCache(maxsize, timeout)
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430 return lru_cache(maxsize, cache, timeout)
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431
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432 def clear(self, *names):
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433 """Clear the given cache(s).
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434
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435 If no 'names' are passed, clear all caches.
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436 """
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437 if len(names) == 0:
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438 names = self._cache.keys()
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439
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440 for name in names:
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441 self._cache[name].clear()