| <!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 `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/h2-0.3.19/src/proto/streams/store.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>store.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../h2/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../h2/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| <span id="324">324</span> |
| <span id="325">325</span> |
| <span id="326">326</span> |
| <span id="327">327</span> |
| <span id="328">328</span> |
| <span id="329">329</span> |
| <span id="330">330</span> |
| <span id="331">331</span> |
| <span id="332">332</span> |
| <span id="333">333</span> |
| <span id="334">334</span> |
| <span id="335">335</span> |
| <span id="336">336</span> |
| <span id="337">337</span> |
| <span id="338">338</span> |
| <span id="339">339</span> |
| <span id="340">340</span> |
| <span id="341">341</span> |
| <span id="342">342</span> |
| <span id="343">343</span> |
| <span id="344">344</span> |
| <span id="345">345</span> |
| <span id="346">346</span> |
| <span id="347">347</span> |
| <span id="348">348</span> |
| <span id="349">349</span> |
| <span id="350">350</span> |
| <span id="351">351</span> |
| <span id="352">352</span> |
| <span id="353">353</span> |
| <span id="354">354</span> |
| <span id="355">355</span> |
| <span id="356">356</span> |
| <span id="357">357</span> |
| <span id="358">358</span> |
| <span id="359">359</span> |
| <span id="360">360</span> |
| <span id="361">361</span> |
| <span id="362">362</span> |
| <span id="363">363</span> |
| <span id="364">364</span> |
| <span id="365">365</span> |
| <span id="366">366</span> |
| <span id="367">367</span> |
| <span id="368">368</span> |
| <span id="369">369</span> |
| <span id="370">370</span> |
| <span id="371">371</span> |
| <span id="372">372</span> |
| <span id="373">373</span> |
| <span id="374">374</span> |
| <span id="375">375</span> |
| <span id="376">376</span> |
| <span id="377">377</span> |
| <span id="378">378</span> |
| <span id="379">379</span> |
| <span id="380">380</span> |
| <span id="381">381</span> |
| <span id="382">382</span> |
| <span id="383">383</span> |
| <span id="384">384</span> |
| <span id="385">385</span> |
| <span id="386">386</span> |
| <span id="387">387</span> |
| <span id="388">388</span> |
| <span id="389">389</span> |
| <span id="390">390</span> |
| <span id="391">391</span> |
| <span id="392">392</span> |
| <span id="393">393</span> |
| <span id="394">394</span> |
| <span id="395">395</span> |
| <span id="396">396</span> |
| <span id="397">397</span> |
| <span id="398">398</span> |
| <span id="399">399</span> |
| <span id="400">400</span> |
| <span id="401">401</span> |
| <span id="402">402</span> |
| <span id="403">403</span> |
| <span id="404">404</span> |
| <span id="405">405</span> |
| <span id="406">406</span> |
| <span id="407">407</span> |
| <span id="408">408</span> |
| <span id="409">409</span> |
| <span id="410">410</span> |
| <span id="411">411</span> |
| <span id="412">412</span> |
| <span id="413">413</span> |
| <span id="414">414</span> |
| <span id="415">415</span> |
| <span id="416">416</span> |
| <span id="417">417</span> |
| <span id="418">418</span> |
| <span id="419">419</span> |
| <span id="420">420</span> |
| <span id="421">421</span> |
| <span id="422">422</span> |
| <span id="423">423</span> |
| <span id="424">424</span> |
| </pre><pre class="rust"><code><span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>indexmap::{<span class="self">self</span>, IndexMap}; |
| |
| <span class="kw">use </span>std::convert::Infallible; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::marker::PhantomData; |
| <span class="kw">use </span>std::ops; |
| |
| <span class="doccomment">/// Storage for streams |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Store { |
| slab: slab::Slab<Stream>, |
| ids: IndexMap<StreamId, SlabIndex>, |
| } |
| |
| <span class="doccomment">/// "Pointer" to an entry in the store |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Ptr<<span class="lifetime">'a</span>> { |
| key: Key, |
| store: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Store, |
| } |
| |
| <span class="doccomment">/// References an entry in the store. |
| </span><span class="attribute">#[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Key { |
| index: SlabIndex, |
| <span class="doccomment">/// Keep the stream ID in the key as an ABA guard, since slab indices |
| /// could be re-used with a new stream. |
| </span>stream_id: StreamId, |
| } |
| |
| <span class="comment">// We can never have more than `StreamId::MAX` streams in the store, |
| // so we can save a smaller index (u32 vs usize). |
| </span><span class="attribute">#[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| </span><span class="kw">struct </span>SlabIndex(u32); |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Queue<N> { |
| indices: <span class="prelude-ty">Option</span><store::Indices>, |
| _p: PhantomData<N>, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">trait </span>Next { |
| <span class="kw">fn </span>next(stream: <span class="kw-2">&</span>Stream) -> <span class="prelude-ty">Option</span><Key>; |
| |
| <span class="kw">fn </span>set_next(stream: <span class="kw-2">&mut </span>Stream, key: <span class="prelude-ty">Option</span><Key>); |
| |
| <span class="kw">fn </span>take_next(stream: <span class="kw-2">&mut </span>Stream) -> <span class="prelude-ty">Option</span><Key>; |
| |
| <span class="kw">fn </span>is_queued(stream: <span class="kw-2">&</span>Stream) -> bool; |
| |
| <span class="kw">fn </span>set_queued(stream: <span class="kw-2">&mut </span>Stream, val: bool); |
| } |
| |
| <span class="doccomment">/// A linked list |
| </span><span class="attribute">#[derive(Debug, Clone, Copy)] |
| </span><span class="kw">struct </span>Indices { |
| <span class="kw">pub </span>head: Key, |
| <span class="kw">pub </span>tail: Key, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">enum </span>Entry<<span class="lifetime">'a</span>> { |
| Occupied(OccupiedEntry<<span class="lifetime">'a</span>>), |
| Vacant(VacantEntry<<span class="lifetime">'a</span>>), |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>OccupiedEntry<<span class="lifetime">'a</span>> { |
| ids: indexmap::map::OccupiedEntry<<span class="lifetime">'a</span>, StreamId, SlabIndex>, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>VacantEntry<<span class="lifetime">'a</span>> { |
| ids: indexmap::map::VacantEntry<<span class="lifetime">'a</span>, StreamId, SlabIndex>, |
| slab: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>slab::Slab<Stream>, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">trait </span>Resolve { |
| <span class="kw">fn </span>resolve(<span class="kw-2">&mut </span><span class="self">self</span>, key: Key) -> Ptr; |
| } |
| |
| <span class="comment">// ===== impl Store ===== |
| |
| </span><span class="kw">impl </span>Store { |
| <span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| Store { |
| slab: slab::Slab::new(), |
| ids: IndexMap::new(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>find_mut(<span class="kw-2">&mut </span><span class="self">self</span>, id: <span class="kw-2">&</span>StreamId) -> <span class="prelude-ty">Option</span><Ptr> { |
| <span class="kw">let </span>index = <span class="kw">match </span><span class="self">self</span>.ids.get(id) { |
| <span class="prelude-val">Some</span>(key) => <span class="kw-2">*</span>key, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| |
| <span class="prelude-val">Some</span>(Ptr { |
| key: Key { |
| index, |
| stream_id: <span class="kw-2">*</span>id, |
| }, |
| store: <span class="self">self</span>, |
| }) |
| } |
| |
| <span class="kw">pub fn </span>insert(<span class="kw-2">&mut </span><span class="self">self</span>, id: StreamId, val: Stream) -> Ptr { |
| <span class="kw">let </span>index = SlabIndex(<span class="self">self</span>.slab.insert(val) <span class="kw">as </span>u32); |
| <span class="macro">assert!</span>(<span class="self">self</span>.ids.insert(id, index).is_none()); |
| |
| Ptr { |
| key: Key { |
| index, |
| stream_id: id, |
| }, |
| store: <span class="self">self</span>, |
| } |
| } |
| |
| <span class="kw">pub fn </span>find_entry(<span class="kw-2">&mut </span><span class="self">self</span>, id: StreamId) -> Entry { |
| <span class="kw">use </span><span class="self">self</span>::indexmap::map::Entry::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span><span class="self">self</span>.ids.entry(id) { |
| Occupied(e) => Entry::Occupied(OccupiedEntry { ids: e }), |
| Vacant(e) => Entry::Vacant(VacantEntry { |
| ids: e, |
| slab: <span class="kw-2">&mut </span><span class="self">self</span>.slab, |
| }), |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>for_each<F>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F) |
| <span class="kw">where |
| </span>F: FnMut(Ptr), |
| { |
| <span class="kw">match </span><span class="self">self</span>.try_for_each(|ptr| { |
| f(ptr); |
| <span class="prelude-val">Ok</span>::<<span class="kw">_</span>, Infallible>(()) |
| }) { |
| <span class="prelude-val">Ok</span>(()) => (), |
| <span class="prelude-val">Err</span>(infallible) => <span class="kw">match </span>infallible {}, |
| } |
| } |
| |
| <span class="kw">pub fn </span>try_for_each<F, E>(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F) -> <span class="prelude-ty">Result</span><(), E> |
| <span class="kw">where |
| </span>F: FnMut(Ptr) -> <span class="prelude-ty">Result</span><(), E>, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>len = <span class="self">self</span>.ids.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| |
| <span class="kw">while </span>i < len { |
| <span class="comment">// Get the key by index, this makes the borrow checker happy |
| </span><span class="kw">let </span>(stream_id, index) = { |
| <span class="kw">let </span>entry = <span class="self">self</span>.ids.get_index(i).unwrap(); |
| (<span class="kw-2">*</span>entry.<span class="number">0</span>, <span class="kw-2">*</span>entry.<span class="number">1</span>) |
| }; |
| |
| f(Ptr { |
| key: Key { index, stream_id }, |
| store: <span class="self">self</span>, |
| })<span class="question-mark">?</span>; |
| |
| <span class="comment">// TODO: This logic probably could be better... |
| </span><span class="kw">let </span>new_len = <span class="self">self</span>.ids.len(); |
| |
| <span class="kw">if </span>new_len < len { |
| <span class="macro">debug_assert!</span>(new_len == len - <span class="number">1</span>); |
| len -= <span class="number">1</span>; |
| } <span class="kw">else </span>{ |
| i += <span class="number">1</span>; |
| } |
| } |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>Resolve <span class="kw">for </span>Store { |
| <span class="kw">fn </span>resolve(<span class="kw-2">&mut </span><span class="self">self</span>, key: Key) -> Ptr { |
| Ptr { key, store: <span class="self">self </span>} |
| } |
| } |
| |
| <span class="kw">impl </span>ops::Index<Key> <span class="kw">for </span>Store { |
| <span class="kw">type </span>Output = Stream; |
| |
| <span class="kw">fn </span>index(<span class="kw-2">&</span><span class="self">self</span>, key: Key) -> <span class="kw-2">&</span><span class="self">Self</span>::Output { |
| <span class="self">self</span>.slab |
| .get(key.index.<span class="number">0 </span><span class="kw">as </span>usize) |
| .filter(|s| s.id == key.stream_id) |
| .unwrap_or_else(|| { |
| <span class="macro">panic!</span>(<span class="string">"dangling store key for stream_id={:?}"</span>, key.stream_id); |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>ops::IndexMut<Key> <span class="kw">for </span>Store { |
| <span class="kw">fn </span>index_mut(<span class="kw-2">&mut </span><span class="self">self</span>, key: Key) -> <span class="kw-2">&mut </span><span class="self">Self</span>::Output { |
| <span class="self">self</span>.slab |
| .get_mut(key.index.<span class="number">0 </span><span class="kw">as </span>usize) |
| .filter(|s| s.id == key.stream_id) |
| .unwrap_or_else(|| { |
| <span class="macro">panic!</span>(<span class="string">"dangling store key for stream_id={:?}"</span>, key.stream_id); |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>Store { |
| <span class="attribute">#[cfg(feature = <span class="string">"unstable"</span>)] |
| </span><span class="kw">pub fn </span>num_active_streams(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.ids.len() |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"unstable"</span>)] |
| </span><span class="kw">pub fn </span>num_wired_streams(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.slab.len() |
| } |
| } |
| |
| <span class="comment">// While running h2 unit/integration tests, enable this debug assertion. |
| // |
| // In practice, we don't need to ensure this. But the integration tests |
| // help to make sure we've cleaned up in cases where we could (like, the |
| // runtime isn't suddenly dropping the task for unknown reasons). |
| </span><span class="attribute">#[cfg(feature = <span class="string">"unstable"</span>)] |
| </span><span class="kw">impl </span>Drop <span class="kw">for </span>Store { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">use </span>std::thread; |
| |
| <span class="kw">if </span>!thread::panicking() { |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.slab.is_empty()); |
| } |
| } |
| } |
| |
| <span class="comment">// ===== impl Queue ===== |
| |
| </span><span class="kw">impl</span><N> Queue<N> |
| <span class="kw">where |
| </span>N: Next, |
| { |
| <span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| Queue { |
| indices: <span class="prelude-val">None</span>, |
| _p: PhantomData, |
| } |
| } |
| |
| <span class="kw">pub fn </span>take(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| Queue { |
| indices: <span class="self">self</span>.indices.take(), |
| _p: PhantomData, |
| } |
| } |
| |
| <span class="doccomment">/// Queue the stream. |
| /// |
| /// If the stream is already contained by the list, return `false`. |
| </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, stream: <span class="kw-2">&mut </span>store::Ptr) -> bool { |
| <span class="macro">tracing::trace!</span>(<span class="string">"Queue::push"</span>); |
| |
| <span class="kw">if </span>N::is_queued(stream) { |
| <span class="macro">tracing::trace!</span>(<span class="string">" -> already queued"</span>); |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| |
| N::set_queued(stream, <span class="bool-val">true</span>); |
| |
| <span class="comment">// The next pointer shouldn't be set |
| </span><span class="macro">debug_assert!</span>(N::next(stream).is_none()); |
| |
| <span class="comment">// Queue the stream |
| </span><span class="kw">match </span><span class="self">self</span>.indices { |
| <span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>idxs) => { |
| <span class="macro">tracing::trace!</span>(<span class="string">" -> existing entries"</span>); |
| |
| <span class="comment">// Update the current tail node to point to `stream` |
| </span><span class="kw">let </span>key = stream.key(); |
| N::set_next(<span class="kw-2">&mut </span>stream.resolve(idxs.tail), <span class="prelude-val">Some</span>(key)); |
| |
| <span class="comment">// Update the tail pointer |
| </span>idxs.tail = stream.key(); |
| } |
| <span class="prelude-val">None </span>=> { |
| <span class="macro">tracing::trace!</span>(<span class="string">" -> first entry"</span>); |
| <span class="self">self</span>.indices = <span class="prelude-val">Some</span>(store::Indices { |
| head: stream.key(), |
| tail: stream.key(), |
| }); |
| } |
| } |
| |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="kw">pub fn </span>pop<<span class="lifetime">'a</span>, R>(<span class="kw-2">&mut </span><span class="self">self</span>, store: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>R) -> <span class="prelude-ty">Option</span><store::Ptr<<span class="lifetime">'a</span>>> |
| <span class="kw">where |
| </span>R: Resolve, |
| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>idxs) = <span class="self">self</span>.indices { |
| <span class="kw">let </span><span class="kw-2">mut </span>stream = store.resolve(idxs.head); |
| |
| <span class="kw">if </span>idxs.head == idxs.tail { |
| <span class="macro">assert!</span>(N::next(<span class="kw-2">&</span>stream).is_none()); |
| <span class="self">self</span>.indices = <span class="prelude-val">None</span>; |
| } <span class="kw">else </span>{ |
| idxs.head = N::take_next(<span class="kw-2">&mut </span>stream).unwrap(); |
| <span class="self">self</span>.indices = <span class="prelude-val">Some</span>(idxs); |
| } |
| |
| <span class="macro">debug_assert!</span>(N::is_queued(<span class="kw-2">&</span>stream)); |
| N::set_queued(<span class="kw-2">&mut </span>stream, <span class="bool-val">false</span>); |
| |
| <span class="kw">return </span><span class="prelude-val">Some</span>(stream); |
| } |
| |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.indices.is_none() |
| } |
| |
| <span class="kw">pub fn </span>pop_if<<span class="lifetime">'a</span>, R, F>(<span class="kw-2">&mut </span><span class="self">self</span>, store: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>R, f: F) -> <span class="prelude-ty">Option</span><store::Ptr<<span class="lifetime">'a</span>>> |
| <span class="kw">where |
| </span>R: Resolve, |
| F: Fn(<span class="kw-2">&</span>Stream) -> bool, |
| { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(idxs) = <span class="self">self</span>.indices { |
| <span class="kw">let </span>should_pop = f(<span class="kw-2">&</span>store.resolve(idxs.head)); |
| <span class="kw">if </span>should_pop { |
| <span class="kw">return </span><span class="self">self</span>.pop(store); |
| } |
| } |
| |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="comment">// ===== impl Ptr ===== |
| |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>> Ptr<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Returns the Key associated with the stream |
| </span><span class="kw">pub fn </span>key(<span class="kw-2">&</span><span class="self">self</span>) -> Key { |
| <span class="self">self</span>.key |
| } |
| |
| <span class="kw">pub fn </span>store_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>Store { |
| <span class="self">self</span>.store |
| } |
| |
| <span class="doccomment">/// Remove the stream from the store |
| </span><span class="kw">pub fn </span>remove(<span class="self">self</span>) -> StreamId { |
| <span class="comment">// The stream must have been unlinked before this point |
| </span><span class="macro">debug_assert!</span>(!<span class="self">self</span>.store.ids.contains_key(<span class="kw-2">&</span><span class="self">self</span>.key.stream_id)); |
| |
| <span class="comment">// Remove the stream state |
| </span><span class="kw">let </span>stream = <span class="self">self</span>.store.slab.remove(<span class="self">self</span>.key.index.<span class="number">0 </span><span class="kw">as </span>usize); |
| <span class="macro">assert_eq!</span>(stream.id, <span class="self">self</span>.key.stream_id); |
| stream.id |
| } |
| |
| <span class="doccomment">/// Remove the StreamId -> stream state association. |
| /// |
| /// This will effectively remove the stream as far as the H2 protocol is |
| /// concerned. |
| </span><span class="kw">pub fn </span>unlink(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">let </span>id = <span class="self">self</span>.key.stream_id; |
| <span class="self">self</span>.store.ids.swap_remove(<span class="kw-2">&</span>id); |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Resolve <span class="kw">for </span>Ptr<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>resolve(<span class="kw-2">&mut </span><span class="self">self</span>, key: Key) -> Ptr { |
| Ptr { |
| key, |
| store: <span class="kw-2">&mut *</span><span class="self">self</span>.store, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> ops::Deref <span class="kw">for </span>Ptr<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Target = Stream; |
| |
| <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Stream { |
| <span class="kw-2">&</span><span class="self">self</span>.store[<span class="self">self</span>.key] |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> ops::DerefMut <span class="kw">for </span>Ptr<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>Stream { |
| <span class="kw-2">&mut </span><span class="self">self</span>.store[<span class="self">self</span>.key] |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> fmt::Debug <span class="kw">for </span>Ptr<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| (<span class="kw-2">**</span><span class="self">self</span>).fmt(fmt) |
| } |
| } |
| |
| <span class="comment">// ===== impl OccupiedEntry ===== |
| |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>> OccupiedEntry<<span class="lifetime">'a</span>> { |
| <span class="kw">pub fn </span>key(<span class="kw-2">&</span><span class="self">self</span>) -> Key { |
| <span class="kw">let </span>stream_id = <span class="kw-2">*</span><span class="self">self</span>.ids.key(); |
| <span class="kw">let </span>index = <span class="kw-2">*</span><span class="self">self</span>.ids.get(); |
| Key { index, stream_id } |
| } |
| } |
| |
| <span class="comment">// ===== impl VacantEntry ===== |
| |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>> VacantEntry<<span class="lifetime">'a</span>> { |
| <span class="kw">pub fn </span>insert(<span class="self">self</span>, value: Stream) -> Key { |
| <span class="comment">// Insert the value in the slab |
| </span><span class="kw">let </span>stream_id = value.id; |
| <span class="kw">let </span>index = SlabIndex(<span class="self">self</span>.slab.insert(value) <span class="kw">as </span>u32); |
| |
| <span class="comment">// Insert the handle in the ID map |
| </span><span class="self">self</span>.ids.insert(index); |
| |
| Key { index, stream_id } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="h2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
