prosody
8603b16e85c7
util/cache.lua

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util/cache.lua @ 7435:8603b16e85c7

util.cache: Add support for creating a proxy table to a cache, that looks and acts (mostly) like a normal table. No tests yet.
author Matthew Wild <mwild1@gmail.com>
date Sun, 22 May 2016 18:18:23 +0100
parent 7354:8ca7f1c2c660
child 7702:9385c367e920
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1
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2 local function _remove(list, m)
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3 if m.prev then
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4 m.prev.next = m.next;
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5 end
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6 if m.next then
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7 m.next.prev = m.prev;
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8 end
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9 if list._tail == m then
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10 list._tail = m.prev;
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11 end
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12 if list._head == m then
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13 list._head = m.next;
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14 end
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15 list._count = list._count - 1;
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16 end
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17
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18 local function _insert(list, m)
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19 if list._head then
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20 list._head.prev = m;
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21 end
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22 m.prev, m.next = nil, list._head;
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23 list._head = m;
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24 if not list._tail then
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25 list._tail = m;
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26 end
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27 list._count = list._count + 1;
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28 end
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29
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30 local cache_methods = {};
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31 local cache_mt = { __index = cache_methods };
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32
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33 function cache_methods:set(k, v)
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34 local m = self._data[k];
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35 if m then
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36 -- Key already exists
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37 if v ~= nil then
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38 -- Bump to head of list
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39 _remove(self, m);
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40 _insert(self, m);
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41 m.value = v;
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42 else
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43 -- Remove from list
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44 _remove(self, m);
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45 self._data[k] = nil;
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46 end
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47 return true;
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48 end
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49 -- New key
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50 if v == nil then
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51 return true;
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52 end
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53 -- Check whether we need to remove oldest k/v
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54 if self._count == self.size then
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55 local tail = self._tail;
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56 local on_evict, evicted_key, evicted_value = self._on_evict, tail.key, tail.value;
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57 if on_evict ~= nil and (on_evict == false or on_evict(evicted_key, evicted_value) == false) then
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58 -- Cache is full, and we're not allowed to evict
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59 return false;
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60 end
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61 _remove(self, tail);
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62 self._data[evicted_key] = nil;
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63 end
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64
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65 m = { key = k, value = v, prev = nil, next = nil };
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66 self._data[k] = m;
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67 _insert(self, m);
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68 return true;
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69 end
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70
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71 function cache_methods:get(k)
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72 local m = self._data[k];
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73 if m then
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74 return m.value;
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75 end
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76 return nil;
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77 end
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78
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79 function cache_methods:items()
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80 local m = self._head;
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81 return function ()
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82 if not m then
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83 return;
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84 end
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85 local k, v = m.key, m.value;
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86 m = m.next;
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87 return k, v;
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88 end
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89 end
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90
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91 function cache_methods:values()
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92 local m = self._head;
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93 return function ()
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94 if not m then
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95 return;
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96 end
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97 local v = m.value;
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98 m = m.next;
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99 return v;
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100 end
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101 end
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102
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103 function cache_methods:count()
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104 return self._count;
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105 end
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106
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107 function cache_methods:head()
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108 local head = self._head;
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109 if not head then return nil, nil; end
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110 return head.key, head.value;
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111 end
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112
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113 function cache_methods:tail()
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114 local tail = self._tail;
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115 if not tail then return nil, nil; end
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116 return tail.key, tail.value;
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117 end
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118
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119 function cache_methods:table()
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120 if not self.proxy_table then
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121 self.proxy_table = setmetatable({}, {
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122 __index = function (t, k)
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123 return self:get(k);
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124 end;
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125 __newindex = function (t, k, v)
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126 if not self:set(k, v) then
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127 error("failed to insert key into cache - full");
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128 end
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129 end;
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130 __pairs = function (t)
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131 return self:items();
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132 end;
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133 __len = function (t)
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134 return self:count();
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135 end;
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136 });
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137 end
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138 return self.proxy_table;
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139 end
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140
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141 local function new(size, on_evict)
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142 size = assert(tonumber(size), "cache size must be a number");
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143 size = math.floor(size);
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144 assert(size > 0, "cache size must be greater than zero");
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145 local data = {};
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146 return setmetatable({ _data = data, _count = 0, size = size, _head = nil, _tail = nil, _on_evict = on_evict }, cache_mt);
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147 end
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148
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149 return {
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150 new = new;
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151 }