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| <div class="headertitle"><div class="title">reverse_purge_hash_map.hpp</div></div> |
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| <div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*</span></div> |
| <div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one</span></div> |
| <div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> * or more contributor license agreements. See the NOTICE file</span></div> |
| <div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> * distributed with this work for additional information</span></div> |
| <div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> * regarding copyright ownership. The ASF licenses this file</span></div> |
| <div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> * to you under the Apache License, Version 2.0 (the</span></div> |
| <div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> * "License"); you may not use this file except in compliance</span></div> |
| <div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> * with the License. You may obtain a copy of the License at</span></div> |
| <div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> *</span></div> |
| <div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div> |
| <div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"> *</span></div> |
| <div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> * Unless required by applicable law or agreed to in writing,</span></div> |
| <div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> * software distributed under the License is distributed on an</span></div> |
| <div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div> |
| <div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> * KIND, either express or implied. See the License for the</span></div> |
| <div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"> * specific language governing permissions and limitations</span></div> |
| <div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> * under the License.</span></div> |
| <div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment"> */</span></div> |
| <div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> </div> |
| <div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#ifndef REVERSE_PURGE_HASH_MAP_HPP_</span></div> |
| <div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#define REVERSE_PURGE_HASH_MAP_HPP_</span></div> |
| <div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span> </div> |
| <div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="preprocessor">#include <memory></span></div> |
| <div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="preprocessor">#include <iterator></span></div> |
| <div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span> </div> |
| <div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespacedatasketches.html">datasketches</a> {</div> |
| <div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> </div> |
| <div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="comment">/*</span></div> |
| <div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="comment"> * This is a specialized linear-probing hash map with a reverse purge operation</span></div> |
| <div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment"> * that removes all entries in the map with values that are less than zero.</span></div> |
| <div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment"> * Based on Java implementation here:</span></div> |
| <div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="comment"> * https://github.com/apache/datasketches-java/blob/master/src/main/java/org/apache/datasketches/frequencies/ReversePurgeItemHashMap.java</span></div> |
| <div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="comment"> * author Alexander Saydakov</span></div> |
| <div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment"> */</span></div> |
| <div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> </div> |
| <div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="keyword">template</span><</div> |
| <div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">typename</span> K,</div> |
| <div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">typename</span> V = uint64_t,</div> |
| <div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <span class="keyword">typename</span> H = std::hash<K>,</div> |
| <div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">typename</span> E = std::equal_to<K>,</div> |
| <div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">typename</span> A = std::allocator<K></div> |
| <div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span>></div> |
| <div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="keyword">class </span>reverse_purge_hash_map {</div> |
| <div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="keyword">public</span>:</div> |
| <div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keyword">using </span>AllocV = <span class="keyword">typename</span> std::allocator_traits<A>::template rebind_alloc<V>;</div> |
| <div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">using </span>AllocU16 = <span class="keyword">typename</span> std::allocator_traits<A>::template rebind_alloc<uint16_t>;</div> |
| <div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div> |
| <div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> reverse_purge_hash_map(uint8_t lg_size, uint8_t lg_max_size, <span class="keyword">const</span> E& equal, <span class="keyword">const</span> A& allocator);</div> |
| <div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> reverse_purge_hash_map(<span class="keyword">const</span> reverse_purge_hash_map& other);</div> |
| <div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> reverse_purge_hash_map(reverse_purge_hash_map&& other) <span class="keyword">noexcept</span>;</div> |
| <div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> ~reverse_purge_hash_map();</div> |
| <div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> reverse_purge_hash_map& operator=(<span class="keyword">const</span> reverse_purge_hash_map& other);</div> |
| <div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> reverse_purge_hash_map& operator=(reverse_purge_hash_map&& other);</div> |
| <div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> </div> |
| <div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">template</span><<span class="keyword">typename</span> FwdK></div> |
| <div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> V adjust_or_insert(FwdK&& key, V value);</div> |
| <div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> </div> |
| <div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> V get(<span class="keyword">const</span> K& key) <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> uint8_t get_lg_cur_size() <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> uint8_t get_lg_max_size() <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> uint32_t get_capacity() <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> uint32_t get_num_active() <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keyword">const</span> A& get_allocator() <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> </div> |
| <div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="keyword">class </span>iterator;</div> |
| <div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> iterator begin() <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> iterator end() <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div> |
| <div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="keyword">private</span>:</div> |
| <div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keywordtype">double</span> LOAD_FACTOR = 0.75;</div> |
| <div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> uint16_t DRIFT_LIMIT = 1024; <span class="comment">// used only for stress testing</span></div> |
| <div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> uint32_t MAX_SAMPLE_SIZE = 1024; <span class="comment">// number of samples to compute approximate median during purge</span></div> |
| <div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> </div> |
| <div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> E equal_;</div> |
| <div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> A allocator_;</div> |
| <div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> uint8_t lg_cur_size_;</div> |
| <div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> uint8_t lg_max_size_;</div> |
| <div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> uint32_t num_active_;</div> |
| <div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> K* keys_;</div> |
| <div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> V* values_;</div> |
| <div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> uint16_t* states_;</div> |
| <div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> </div> |
| <div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> is_active(uint32_t probe) <span class="keyword">const</span>;</div> |
| <div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="keywordtype">void</span> subtract_and_keep_positive_only(V amount);</div> |
| <div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="keywordtype">void</span> hash_delete(uint32_t probe);</div> |
| <div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> uint32_t internal_adjust_or_insert(<span class="keyword">const</span> K& key, V value);</div> |
| <div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> V resize_or_purge_if_needed();</div> |
| <div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="keywordtype">void</span> resize(uint8_t lg_new_size);</div> |
| <div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> V purge();</div> |
| <div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span>};</div> |
| <div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> </div> |
| <div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="comment">// This iterator uses strides based on golden ratio to avoid clustering during merge</span></div> |
| <div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="keyword">template</span><<span class="keyword">typename</span> K, <span class="keyword">typename</span> V, <span class="keyword">typename</span> H, <span class="keyword">typename</span> E, <span class="keyword">typename</span> A></div> |
| <div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span><span class="keyword">class </span>reverse_purge_hash_map<K, V, H, E, A>::iterator {</div> |
| <div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span><span class="keyword">public</span>:</div> |
| <div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> <span class="keyword">using </span>iterator_category = std::input_iterator_tag;</div> |
| <div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="keyword">using </span>value_type = std::pair<K&, V>;</div> |
| <div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="keyword">using </span>difference_type = void;</div> |
| <div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="keyword">using </span>pointer = void;</div> |
| <div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="keyword">using </span>reference = <span class="keyword">const</span> value_type;</div> |
| <div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> </div> |
| <div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <span class="keyword">friend</span> <span class="keyword">class </span>reverse_purge_hash_map<K, V, H, E, A>;</div> |
| <div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> iterator& operator++() {</div> |
| <div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> ++count;</div> |
| <div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="keywordflow">if</span> (count < map->num_active_) {</div> |
| <div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> <span class="keyword">const</span> uint32_t mask = (1 << map->lg_cur_size_) - 1;</div> |
| <div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> <span class="keywordflow">do</span> {</div> |
| <div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> index = (index + stride) & mask;</div> |
| <div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> } <span class="keywordflow">while</span> (!map->is_active(index));</div> |
| <div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> }</div> |
| <div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div> |
| <div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> }</div> |
| <div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> iterator operator++(<span class="keywordtype">int</span>) { iterator tmp(*<span class="keyword">this</span>); operator++(); <span class="keywordflow">return</span> tmp; }</div> |
| <div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> iterator& rhs)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> count == rhs.count; }</div> |
| <div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> iterator& rhs)<span class="keyword"> const </span>{ <span class="keywordflow">return</span> count != rhs.count; }</div> |
| <div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> reference operator*()<span class="keyword"> const </span>{</div> |
| <div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <span class="keywordflow">return</span> value_type(map->keys_[index], map->values_[index]);</div> |
| <div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> }</div> |
| <div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span><span class="keyword">private</span>:</div> |
| <div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keywordtype">double</span> GOLDEN_RATIO_RECIPROCAL = 0.6180339887498949; <span class="comment">// = (sqrt(5) - 1) / 2</span></div> |
| <div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> <span class="keyword">const</span> reverse_purge_hash_map<K, V, H, E, A>* map;</div> |
| <div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> uint32_t index;</div> |
| <div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> uint32_t count;</div> |
| <div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> uint32_t stride;</div> |
| <div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> iterator(<span class="keyword">const</span> reverse_purge_hash_map<K, V, H, E, A>* map, uint32_t index, uint32_t count):</div> |
| <div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> map(map), index(index), count(count), stride(static_cast<uint32_t>((1 << map->lg_cur_size_) * GOLDEN_RATIO_RECIPROCAL) | 1) {}</div> |
| <div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span>};</div> |
| <div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> </div> |
| <div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span>} <span class="comment">/* namespace datasketches */</span></div> |
| <div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> </div> |
| <div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span><span class="preprocessor">#include "reverse_purge_hash_map_impl.hpp"</span></div> |
| <div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> </div> |
| <div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span><span class="preprocessor">#endif</span></div> |
| <div class="ttc" id="anamespacedatasketches_html"><div class="ttname"><a href="namespacedatasketches.html">datasketches</a></div><div class="ttdoc">DataSketches namespace.</div><div class="ttdef"><b>Definition</b> binomial_bounds.hpp:38</div></div> |
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