<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src\memory\pool.rs`."><title>pool.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-ca0dd0c4.css"><script id="default-settings"
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<a href=#2 id=2 data-nosnippet>2</a>///
<a href=#3 id=3 data-nosnippet>3</a>/// This module provides the fundamental memory allocation components
<a href=#4 id=4 data-nosnippet>4</a>/// including memory pools, arenas, and thread-local caches for efficient
<a href=#5 id=5 data-nosnippet>5</a>/// memory management.
<a href=#6 id=6 data-nosnippet>6</a></span><span class="comment">// Standard library imports
<a href=#7 id=7 data-nosnippet>7</a></span><span class="kw">use </span>std::{
<a href=#8 id=8 data-nosnippet>8</a> alloc::{Layout, dealloc},
<a href=#9 id=9 data-nosnippet>9</a> sync::{
<a href=#10 id=10 data-nosnippet>10</a> Arc,
<a href=#11 id=11 data-nosnippet>11</a> atomic::{AtomicBool, AtomicUsize, Ordering},
<a href=#12 id=12 data-nosnippet>12</a> },
<a href=#13 id=13 data-nosnippet>13</a>};
<a href=#14 id=14 data-nosnippet>14</a>
<a href=#15 id=15 data-nosnippet>15</a><span class="comment">// External crate imports
<a href=#16 id=16 data-nosnippet>16</a></span><span class="kw">use </span>ahash::AHashMap;
<a href=#17 id=17 data-nosnippet>17</a><span class="kw">use </span>arc_swap::ArcSwap;
<a href=#18 id=18 data-nosnippet>18</a><span class="kw">use </span>parking_lot::Mutex;
<a href=#19 id=19 data-nosnippet>19</a>
<a href=#20 id=20 data-nosnippet>20</a><span class="comment">// Local imports
<a href=#21 id=21 data-nosnippet>21</a></span><span class="kw">use super</span>::{MemoryPoolConfig, MemoryStats, calc_ratio};
<a href=#22 id=22 data-nosnippet>22</a>
<a href=#23 id=23 data-nosnippet>23</a><span class="doccomment">/// Memory pool for efficient allocations
<a href=#24 id=24 data-nosnippet>24</a></span><span class="attr">#[derive(Debug)]
<a href=#25 id=25 data-nosnippet>25</a></span><span class="kw">pub struct </span>MemoryPool {
<a href=#26 id=26 data-nosnippet>26</a> config: MemoryPoolConfig,
<a href=#27 id=27 data-nosnippet>27</a> allocated_blocks: Mutex<AHashMap<usize, Vec<Box<[u8]>>>>,
<a href=#28 id=28 data-nosnippet>28</a> stats: ArcSwap<MemoryStats>,
<a href=#29 id=29 data-nosnippet>29</a> active: AtomicBool,
<a href=#30 id=30 data-nosnippet>30</a>}
<a href=#31 id=31 data-nosnippet>31</a>
<a href=#32 id=32 data-nosnippet>32</a><span class="kw">impl </span>MemoryPool {
<a href=#33 id=33 data-nosnippet>33</a> <span class="doccomment">/// Create a new memory pool
<a href=#34 id=34 data-nosnippet>34</a> </span><span class="attr">#[must_use]
<a href=#35 id=35 data-nosnippet>35</a> </span><span class="kw">pub fn </span>new(config: MemoryPoolConfig) -> <span class="self">Self </span>{
<a href=#36 id=36 data-nosnippet>36</a> <span class="self">Self </span>{
<a href=#37 id=37 data-nosnippet>37</a> config,
<a href=#38 id=38 data-nosnippet>38</a> allocated_blocks: Mutex::new(AHashMap::new()),
<a href=#39 id=39 data-nosnippet>39</a> stats: ArcSwap::new(Arc::new(MemoryStats::default())),
<a href=#40 id=40 data-nosnippet>40</a> active: AtomicBool::new(<span class="bool-val">true</span>),
<a href=#41 id=41 data-nosnippet>41</a> }
<a href=#42 id=42 data-nosnippet>42</a> }
<a href=#43 id=43 data-nosnippet>43</a>
<a href=#44 id=44 data-nosnippet>44</a> <span class="doccomment">/// Allocate memory from the pool
<a href=#45 id=45 data-nosnippet>45</a> ///
<a href=#46 id=46 data-nosnippet>46</a> /// # Errors
<a href=#47 id=47 data-nosnippet>47</a> ///
<a href=#48 id=48 data-nosnippet>48</a> /// Returns an `std::io::Error` if the pool is inactive or size limits are exceeded.
<a href=#49 id=49 data-nosnippet>49</a> </span><span class="kw">pub fn </span>allocate(<span class="kw-2">&</span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><<span class="kw-2">*mut </span>u8, std::io::Error> {
<a href=#50 id=50 data-nosnippet>50</a> <span class="kw">if </span>!<span class="self">self</span>.active.load(Ordering::Relaxed) {
<a href=#51 id=51 data-nosnippet>51</a> <span class="kw">return </span><span class="prelude-val">Err</span>(std::io::Error::other(<span class="string">"Pool is inactive"</span>));
<a href=#52 id=52 data-nosnippet>52</a> }
<a href=#53 id=53 data-nosnippet>53</a>
<a href=#54 id=54 data-nosnippet>54</a> <span class="comment">// Check size limits
<a href=#55 id=55 data-nosnippet>55</a> </span><span class="kw">if let </span><span class="prelude-val">Some</span>(max_size) = <span class="self">self</span>.config.max_size {
<a href=#56 id=56 data-nosnippet>56</a> <span class="kw">let </span>current_stats = <span class="self">self</span>.stats.load();
<a href=#57 id=57 data-nosnippet>57</a> <span class="kw">if </span>current_stats.allocated_bytes + size > max_size {
<a href=#58 id=58 data-nosnippet>58</a> <span class="kw">return </span><span class="prelude-val">Err</span>(std::io::Error::other(<span class="string">"Pool size limit exceeded"</span>));
<a href=#59 id=59 data-nosnippet>59</a> }
<a href=#60 id=60 data-nosnippet>60</a> }
<a href=#61 id=61 data-nosnippet>61</a>
<a href=#62 id=62 data-nosnippet>62</a> <span class="kw">let </span><span class="kw-2">mut </span>boxed = <span class="macro">vec!</span>[<span class="number">0u8</span>; size].into_boxed_slice();
<a href=#63 id=63 data-nosnippet>63</a> <span class="kw">let </span>ptr = boxed.as_mut_ptr();
<a href=#64 id=64 data-nosnippet>64</a>
<a href=#65 id=65 data-nosnippet>65</a> <span class="comment">// Track allocation
<a href=#66 id=66 data-nosnippet>66</a> </span><span class="kw">let </span><span class="kw-2">mut </span>blocks = <span class="self">self</span>.allocated_blocks.lock();
<a href=#67 id=67 data-nosnippet>67</a> blocks.entry(size).or_default().push(boxed);
<a href=#68 id=68 data-nosnippet>68</a>
<a href=#69 id=69 data-nosnippet>69</a> <span class="comment">// Update stats
<a href=#70 id=70 data-nosnippet>70</a> </span><span class="kw">let </span><span class="kw-2">mut </span>new_stats = (<span class="kw-2">**</span><span class="self">self</span>.stats.load()).clone();
<a href=#71 id=71 data-nosnippet>71</a> new_stats.allocated_bytes += size;
<a href=#72 id=72 data-nosnippet>72</a> new_stats.allocation_count += <span class="number">1</span>;
<a href=#73 id=73 data-nosnippet>73</a> new_stats.total_allocated_bytes += size;
<a href=#74 id=74 data-nosnippet>74</a> new_stats.peak_allocated_bytes = new_stats
<a href=#75 id=75 data-nosnippet>75</a> .peak_allocated_bytes
<a href=#76 id=76 data-nosnippet>76</a> .max(new_stats.allocated_bytes);
<a href=#77 id=77 data-nosnippet>77</a> <span class="self">self</span>.stats.store(Arc::new(new_stats));
<a href=#78 id=78 data-nosnippet>78</a>
<a href=#79 id=79 data-nosnippet>79</a> <span class="prelude-val">Ok</span>(ptr)
<a href=#80 id=80 data-nosnippet>80</a> }
<a href=#81 id=81 data-nosnippet>81</a>
<a href=#82 id=82 data-nosnippet>82</a> <span class="doccomment">/// Deallocate memory from the pool
<a href=#83 id=83 data-nosnippet>83</a> ///
<a href=#84 id=84 data-nosnippet>84</a> /// # Errors
<a href=#85 id=85 data-nosnippet>85</a> ///
<a href=#86 id=86 data-nosnippet>86</a> /// Returns an `std::io::Error` if the layout is invalid.
<a href=#87 id=87 data-nosnippet>87</a> </span><span class="attr">#[allow(clippy::not_unsafe_ptr_arg_deref)]
<a href=#88 id=88 data-nosnippet>88</a> </span><span class="kw">pub fn </span>deallocate(<span class="kw-2">&</span><span class="self">self</span>, ptr: <span class="kw-2">*mut </span>u8, size: usize) -> <span class="prelude-ty">Result</span><(), std::io::Error> {
<a href=#89 id=89 data-nosnippet>89</a> <span class="kw">if </span>ptr.is_null() {
<a href=#90 id=90 data-nosnippet>90</a> <span class="kw">return </span><span class="prelude-val">Ok</span>(());
<a href=#91 id=91 data-nosnippet>91</a> }
<a href=#92 id=92 data-nosnippet>92</a>
<a href=#93 id=93 data-nosnippet>93</a> <span class="kw">let </span>layout = Layout::from_size_align(size, <span class="self">self</span>.config.alignment)
<a href=#94 id=94 data-nosnippet>94</a> .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidInput, e))<span class="question-mark">?</span>;
<a href=#95 id=95 data-nosnippet>95</a>
<a href=#96 id=96 data-nosnippet>96</a> <span class="kw">unsafe </span>{ dealloc(ptr, layout) };
<a href=#97 id=97 data-nosnippet>97</a>
<a href=#98 id=98 data-nosnippet>98</a> <span class="comment">// Remove from tracking
<a href=#99 id=99 data-nosnippet>99</a> </span><span class="kw">let </span><span class="kw-2">mut </span>blocks = <span class="self">self</span>.allocated_blocks.lock();
<a href=#100 id=100 data-nosnippet>100</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(block_list) = blocks.get_mut(<span class="kw-2">&</span>size)
<a href=#101 id=101 data-nosnippet>101</a> && <span class="kw">let </span><span class="prelude-val">Some</span>(pos) = block_list.iter().position(|b| b.as_ptr().cast_mut() == ptr)
<a href=#102 id=102 data-nosnippet>102</a> {
<a href=#103 id=103 data-nosnippet>103</a> block_list.remove(pos);
<a href=#104 id=104 data-nosnippet>104</a> }
<a href=#105 id=105 data-nosnippet>105</a>
<a href=#106 id=106 data-nosnippet>106</a> <span class="comment">// Update stats
<a href=#107 id=107 data-nosnippet>107</a> </span><span class="kw">let </span><span class="kw-2">mut </span>new_stats = (<span class="kw-2">**</span><span class="self">self</span>.stats.load()).clone();
<a href=#108 id=108 data-nosnippet>108</a> new_stats.allocated_bytes = new_stats.allocated_bytes.saturating_sub(size);
<a href=#109 id=109 data-nosnippet>109</a> new_stats.deallocation_count += <span class="number">1</span>;
<a href=#110 id=110 data-nosnippet>110</a> <span class="self">self</span>.stats.store(Arc::new(new_stats));
<a href=#111 id=111 data-nosnippet>111</a>
<a href=#112 id=112 data-nosnippet>112</a> <span class="prelude-val">Ok</span>(())
<a href=#113 id=113 data-nosnippet>113</a> }
<a href=#114 id=114 data-nosnippet>114</a>
<a href=#115 id=115 data-nosnippet>115</a> <span class="doccomment">/// Get current statistics
<a href=#116 id=116 data-nosnippet>116</a> </span><span class="attr">#[must_use]
<a href=#117 id=117 data-nosnippet>117</a> </span><span class="kw">pub fn </span>stats(<span class="kw-2">&</span><span class="self">self</span>) -> Arc<MemoryStats> {
<a href=#118 id=118 data-nosnippet>118</a> <span class="self">self</span>.stats.load_full()
<a href=#119 id=119 data-nosnippet>119</a> }
<a href=#120 id=120 data-nosnippet>120</a>
<a href=#121 id=121 data-nosnippet>121</a> <span class="doccomment">/// Get pool configuration
<a href=#122 id=122 data-nosnippet>122</a> </span><span class="attr">#[must_use]
<a href=#123 id=123 data-nosnippet>123</a> </span><span class="kw">pub fn </span>config(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>MemoryPoolConfig {
<a href=#124 id=124 data-nosnippet>124</a> <span class="kw-2">&</span><span class="self">self</span>.config
<a href=#125 id=125 data-nosnippet>125</a> }
<a href=#126 id=126 data-nosnippet>126</a>
<a href=#127 id=127 data-nosnippet>127</a> <span class="doccomment">/// Check if pool is active
<a href=#128 id=128 data-nosnippet>128</a> </span><span class="attr">#[must_use]
<a href=#129 id=129 data-nosnippet>129</a> </span><span class="kw">pub fn </span>is_active(<span class="kw-2">&</span><span class="self">self</span>) -> bool {
<a href=#130 id=130 data-nosnippet>130</a> <span class="self">self</span>.active.load(Ordering::Relaxed)
<a href=#131 id=131 data-nosnippet>131</a> }
<a href=#132 id=132 data-nosnippet>132</a>
<a href=#133 id=133 data-nosnippet>133</a> <span class="doccomment">/// Deactivate the pool
<a href=#134 id=134 data-nosnippet>134</a> </span><span class="kw">pub fn </span>deactivate(<span class="kw-2">&</span><span class="self">self</span>) {
<a href=#135 id=135 data-nosnippet>135</a> <span class="self">self</span>.active.store(<span class="bool-val">false</span>, Ordering::Relaxed);
<a href=#136 id=136 data-nosnippet>136</a> }
<a href=#137 id=137 data-nosnippet>137</a>
<a href=#138 id=138 data-nosnippet>138</a> <span class="doccomment">/// Get fragmentation ratio
<a href=#139 id=139 data-nosnippet>139</a> </span><span class="attr">#[allow(clippy::cast_precision_loss)]
<a href=#140 id=140 data-nosnippet>140</a> #[must_use]
<a href=#141 id=141 data-nosnippet>141</a> </span><span class="kw">pub fn </span>fragmentation_ratio(<span class="kw-2">&</span><span class="self">self</span>) -> f64 {
<a href=#142 id=142 data-nosnippet>142</a> <span class="kw">let </span>stats = <span class="self">self</span>.stats.load();
<a href=#143 id=143 data-nosnippet>143</a> calc_ratio(stats.allocated_bytes, stats.heap_size)
<a href=#144 id=144 data-nosnippet>144</a> }
<a href=#145 id=145 data-nosnippet>145</a>}
<a href=#146 id=146 data-nosnippet>146</a>
<a href=#147 id=147 data-nosnippet>147</a><span class="kw">impl </span>Default <span class="kw">for </span>MemoryPool {
<a href=#148 id=148 data-nosnippet>148</a> <span class="kw">fn </span>default() -> <span class="self">Self </span>{
<a href=#149 id=149 data-nosnippet>149</a> <span class="self">Self</span>::new(MemoryPoolConfig {
<a href=#150 id=150 data-nosnippet>150</a> initial_size: <span class="number">1024 </span>* <span class="number">1024</span>,
<a href=#151 id=151 data-nosnippet>151</a> max_size: <span class="prelude-val">Some</span>(<span class="number">100 </span>* <span class="number">1024 </span>* <span class="number">1024</span>),
<a href=#152 id=152 data-nosnippet>152</a> alignment: <span class="number">8</span>,
<a href=#153 id=153 data-nosnippet>153</a> name: <span class="string">"default"</span>.to_string(),
<a href=#154 id=154 data-nosnippet>154</a> })
<a href=#155 id=155 data-nosnippet>155</a> }
<a href=#156 id=156 data-nosnippet>156</a>}
<a href=#157 id=157 data-nosnippet>157</a>
<a href=#158 id=158 data-nosnippet>158</a><span class="doccomment">/// Memory arena for bulk allocations
<a href=#159 id=159 data-nosnippet>159</a></span><span class="attr">#[derive(Debug)]
<a href=#160 id=160 data-nosnippet>160</a></span><span class="kw">pub struct </span>MemoryArena {
<a href=#161 id=161 data-nosnippet>161</a> buffer: Mutex<Vec<u8>>,
<a href=#162 id=162 data-nosnippet>162</a> offset: AtomicUsize,
<a href=#163 id=163 data-nosnippet>163</a> capacity: usize,
<a href=#164 id=164 data-nosnippet>164</a> name: String,
<a href=#165 id=165 data-nosnippet>165</a>}
<a href=#166 id=166 data-nosnippet>166</a>
<a href=#167 id=167 data-nosnippet>167</a><span class="kw">impl </span>MemoryArena {
<a href=#168 id=168 data-nosnippet>168</a> <span class="doccomment">/// Create a new memory arena
<a href=#169 id=169 data-nosnippet>169</a> </span><span class="attr">#[must_use]
<a href=#170 id=170 data-nosnippet>170</a> </span><span class="kw">pub fn </span>new(capacity: usize, name: String) -> <span class="self">Self </span>{
<a href=#171 id=171 data-nosnippet>171</a> <span class="self">Self </span>{
<a href=#172 id=172 data-nosnippet>172</a> buffer: Mutex::new(<span class="macro">vec!</span>[<span class="number">0u8</span>; capacity]),
<a href=#173 id=173 data-nosnippet>173</a> offset: AtomicUsize::new(<span class="number">0</span>),
<a href=#174 id=174 data-nosnippet>174</a> capacity,
<a href=#175 id=175 data-nosnippet>175</a> name,
<a href=#176 id=176 data-nosnippet>176</a> }
<a href=#177 id=177 data-nosnippet>177</a> }
<a href=#178 id=178 data-nosnippet>178</a>
<a href=#179 id=179 data-nosnippet>179</a> <span class="doccomment">/// Allocate from the arena
<a href=#180 id=180 data-nosnippet>180</a> ///
<a href=#181 id=181 data-nosnippet>181</a> /// # Errors
<a href=#182 id=182 data-nosnippet>182</a> ///
<a href=#183 id=183 data-nosnippet>183</a> /// Returns an `std::io::Error` if the arena is full.
<a href=#184 id=184 data-nosnippet>184</a> </span><span class="kw">pub fn </span>allocate(<span class="kw-2">&</span><span class="self">self</span>, size: usize) -> <span class="prelude-ty">Result</span><Vec<u8>, std::io::Error> {
<a href=#185 id=185 data-nosnippet>185</a> <span class="kw">let </span>current_offset = <span class="self">self</span>.offset.fetch_add(size, Ordering::Relaxed);
<a href=#186 id=186 data-nosnippet>186</a>
<a href=#187 id=187 data-nosnippet>187</a> <span class="kw">if </span>current_offset + size > <span class="self">self</span>.capacity {
<a href=#188 id=188 data-nosnippet>188</a> <span class="kw">return </span><span class="prelude-val">Err</span>(std::io::Error::new(
<a href=#189 id=189 data-nosnippet>189</a> std::io::ErrorKind::OutOfMemory,
<a href=#190 id=190 data-nosnippet>190</a> <span class="string">"Arena full"</span>,
<a href=#191 id=191 data-nosnippet>191</a> ));
<a href=#192 id=192 data-nosnippet>192</a> }
<a href=#193 id=193 data-nosnippet>193</a>
<a href=#194 id=194 data-nosnippet>194</a> <span class="kw">let </span>buffer = <span class="self">self</span>.buffer.lock();
<a href=#195 id=195 data-nosnippet>195</a> <span class="kw">let </span>slice = <span class="kw-2">&</span>buffer[current_offset..current_offset + size];
<a href=#196 id=196 data-nosnippet>196</a> <span class="prelude-val">Ok</span>(slice.to_vec())
<a href=#197 id=197 data-nosnippet>197</a> }
<a href=#198 id=198 data-nosnippet>198</a>
<a href=#199 id=199 data-nosnippet>199</a> <span class="doccomment">/// Reset the arena
<a href=#200 id=200 data-nosnippet>200</a> </span><span class="kw">pub fn </span>reset(<span class="kw-2">&</span><span class="self">self</span>) {
<a href=#201 id=201 data-nosnippet>201</a> <span class="self">self</span>.offset.store(<span class="number">0</span>, Ordering::Relaxed);
<a href=#202 id=202 data-nosnippet>202</a> }
<a href=#203 id=203 data-nosnippet>203</a>
<a href=#204 id=204 data-nosnippet>204</a> <span class="doccomment">/// Get current usage
<a href=#205 id=205 data-nosnippet>205</a> </span><span class="attr">#[must_use]
<a href=#206 id=206 data-nosnippet>206</a> </span><span class="kw">pub fn </span>usage(<span class="kw-2">&</span><span class="self">self</span>) -> usize {
<a href=#207 id=207 data-nosnippet>207</a> <span class="self">self</span>.offset.load(Ordering::Relaxed)
<a href=#208 id=208 data-nosnippet>208</a> }
<a href=#209 id=209 data-nosnippet>209</a>
<a href=#210 id=210 data-nosnippet>210</a> <span class="doccomment">/// Get capacity
<a href=#211 id=211 data-nosnippet>211</a> </span><span class="attr">#[must_use]
<a href=#212 id=212 data-nosnippet>212</a> </span><span class="kw">pub fn </span>capacity(<span class="kw-2">&</span><span class="self">self</span>) -> usize {
<a href=#213 id=213 data-nosnippet>213</a> <span class="self">self</span>.capacity
<a href=#214 id=214 data-nosnippet>214</a> }
<a href=#215 id=215 data-nosnippet>215</a>
<a href=#216 id=216 data-nosnippet>216</a> <span class="doccomment">/// Get arena name
<a href=#217 id=217 data-nosnippet>217</a> </span><span class="attr">#[must_use]
<a href=#218 id=218 data-nosnippet>218</a> </span><span class="kw">pub fn </span>name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str {
<a href=#219 id=219 data-nosnippet>219</a> <span class="kw-2">&</span><span class="self">self</span>.name
<a href=#220 id=220 data-nosnippet>220</a> }
<a href=#221 id=221 data-nosnippet>221</a>}
<a href=#222 id=222 data-nosnippet>222</a>
<a href=#223 id=223 data-nosnippet>223</a><span class="doccomment">/// Thread-local memory cache
<a href=#224 id=224 data-nosnippet>224</a></span><span class="kw">pub struct </span>ThreadLocalCache<T> {
<a href=#225 id=225 data-nosnippet>225</a> cache: Mutex<Vec<T>>,
<a href=#226 id=226 data-nosnippet>226</a> max_size: usize,
<a href=#227 id=227 data-nosnippet>227</a> factory: Box<<span class="kw">dyn </span>Fn() -> T + Send + Sync>,
<a href=#228 id=228 data-nosnippet>228</a>}
<a href=#229 id=229 data-nosnippet>229</a>
<a href=#230 id=230 data-nosnippet>230</a><span class="kw">impl</span><T> ThreadLocalCache<T> {
<a href=#231 id=231 data-nosnippet>231</a> <span class="doccomment">/// Create a new thread-local cache
<a href=#232 id=232 data-nosnippet>232</a> </span><span class="attr">#[must_use]
<a href=#233 id=233 data-nosnippet>233</a> </span><span class="kw">pub fn </span>new(max_size: usize, factory: Box<<span class="kw">dyn </span>Fn() -> T + Send + Sync>) -> <span class="self">Self </span>{
<a href=#234 id=234 data-nosnippet>234</a> <span class="self">Self </span>{
<a href=#235 id=235 data-nosnippet>235</a> cache: Mutex::new(Vec::new()),
<a href=#236 id=236 data-nosnippet>236</a> max_size,
<a href=#237 id=237 data-nosnippet>237</a> factory,
<a href=#238 id=238 data-nosnippet>238</a> }
<a href=#239 id=239 data-nosnippet>239</a> }
<a href=#240 id=240 data-nosnippet>240</a>
<a href=#241 id=241 data-nosnippet>241</a> <span class="doccomment">/// Get an item from the cache or create new
<a href=#242 id=242 data-nosnippet>242</a> </span><span class="kw">pub fn </span>get_or_create(<span class="kw-2">&</span><span class="self">self</span>) -> T {
<a href=#243 id=243 data-nosnippet>243</a> <span class="kw">let </span><span class="kw-2">mut </span>cache = <span class="self">self</span>.cache.lock();
<a href=#244 id=244 data-nosnippet>244</a> <span class="kw">if let </span><span class="prelude-val">Some</span>(item) = cache.pop() {
<a href=#245 id=245 data-nosnippet>245</a> item
<a href=#246 id=246 data-nosnippet>246</a> } <span class="kw">else </span>{
<a href=#247 id=247 data-nosnippet>247</a> (<span class="self">self</span>.factory)()
<a href=#248 id=248 data-nosnippet>248</a> }
<a href=#249 id=249 data-nosnippet>249</a> }
<a href=#250 id=250 data-nosnippet>250</a>
<a href=#251 id=251 data-nosnippet>251</a> <span class="doccomment">/// Return an item to the cache
<a href=#252 id=252 data-nosnippet>252</a> </span><span class="kw">pub fn </span>return_item(<span class="kw-2">&</span><span class="self">self</span>, item: T) {
<a href=#253 id=253 data-nosnippet>253</a> <span class="kw">let </span><span class="kw-2">mut </span>cache = <span class="self">self</span>.cache.lock();
<a href=#254 id=254 data-nosnippet>254</a> <span class="kw">if </span>cache.len() < <span class="self">self</span>.max_size {
<a href=#255 id=255 data-nosnippet>255</a> cache.push(item);
<a href=#256 id=256 data-nosnippet>256</a> }
<a href=#257 id=257 data-nosnippet>257</a> }
<a href=#258 id=258 data-nosnippet>258</a>
<a href=#259 id=259 data-nosnippet>259</a> <span class="doccomment">/// Get cache size
<a href=#260 id=260 data-nosnippet>260</a> </span><span class="attr">#[must_use]
<a href=#261 id=261 data-nosnippet>261</a> </span><span class="kw">pub fn </span>size(<span class="kw-2">&</span><span class="self">self</span>) -> usize {
<a href=#262 id=262 data-nosnippet>262</a> <span class="self">self</span>.cache.lock().len()
<a href=#263 id=263 data-nosnippet>263</a> }
<a href=#264 id=264 data-nosnippet>264</a>
<a href=#265 id=265 data-nosnippet>265</a> <span class="doccomment">/// Clear the cache
<a href=#266 id=266 data-nosnippet>266</a> </span><span class="kw">pub fn </span>clear(<span class="kw-2">&</span><span class="self">self</span>) {
<a href=#267 id=267 data-nosnippet>267</a> <span class="self">self</span>.cache.lock().clear();
<a href=#268 id=268 data-nosnippet>268</a> }
<a href=#269 id=269 data-nosnippet>269</a>
<a href=#270 id=270 data-nosnippet>270</a> <span class="doccomment">/// Check if cache is empty
<a href=#271 id=271 data-nosnippet>271</a> </span><span class="attr">#[must_use]
<a href=#272 id=272 data-nosnippet>272</a> </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool {
<a href=#273 id=273 data-nosnippet>273</a> <span class="self">self</span>.cache.lock().is_empty()
<a href=#274 id=274 data-nosnippet>274</a> }
<a href=#275 id=275 data-nosnippet>275</a>}</code></pre></div></section></main></body></html>