| <!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/sunhe/incubator-teaclave/third_party/rust-sgx-sdk/sgx_protected_fs/tfs/src/sys/cache/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.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="../../../../sgx_tprotected_fs/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="../../../../sgx_tprotected_fs/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> |
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| </pre><pre class="rust"><code><span class="comment">// Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| </span><span class="attribute">#![allow(dead_code)] |
| |
| </span><span class="kw">use </span>list::{LinkedList, Node}; |
| <span class="kw">use </span>std::cell::RefCell; |
| <span class="kw">use </span>std::collections::HashMap; |
| <span class="kw">use </span>std::ptr::NonNull; |
| <span class="kw">use </span>std::sync::Arc; |
| |
| <span class="kw">mod </span>list; |
| |
| <span class="kw">pub type </span>NodeRef<T> = Arc<RefCell<T>>; |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>LruEntry<T> { |
| node_ref: NonNull<Node<u64>>, |
| value: NodeRef<T>, |
| } |
| |
| <span class="kw">impl</span><T> LruEntry<T> { |
| <span class="kw">fn </span>new(node_ref: NonNull<Node<u64>>, value: NodeRef<T>) -> LruEntry<T> { |
| LruEntry { node_ref, value } |
| } |
| } |
| |
| <span class="kw">pub struct </span>Iter<<span class="lifetime">'a</span>, T: <span class="lifetime">'a</span>> { |
| iter: list::Iter<<span class="lifetime">'a</span>, u64>, |
| map: <span class="kw-2">&</span><span class="lifetime">'a </span>HashMap<u64, LruEntry<T>>, |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>LruCache<T> { |
| list: LinkedList<u64>, |
| map: HashMap<u64, LruEntry<T>>, |
| max_size: usize, |
| } |
| |
| <span class="kw">impl</span><T> LruCache<T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>new(capacity: usize) -> LruCache<T> { |
| LruCache { |
| list: LinkedList::new(), |
| map: HashMap::with_capacity(capacity), |
| max_size: capacity, |
| } |
| } |
| |
| <span class="doccomment">/// Return the maximum number of key-value pairs the cache can hold. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>capacity(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.max_size |
| } |
| |
| <span class="doccomment">/// Returns `true` if the cache is empty. |
| </span><span class="attribute">#[inline] |
| </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>.list.is_empty() |
| } |
| |
| <span class="doccomment">/// Returns the length of the cache. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>len(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.list.len() |
| } |
| |
| <span class="doccomment">/// Adds an element first in the cache. |
| </span><span class="kw">pub fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, key: u64, value: NodeRef<T>) -> bool { |
| <span class="kw">let </span>is_none = <span class="self">self</span>.map.get(<span class="kw-2">&</span>key).is_none(); |
| <span class="kw">if </span>is_none { |
| <span class="self">self</span>.list.push_front(key); |
| <span class="kw">let </span>node_ref = <span class="kw">unsafe </span>{ <span class="self">self</span>.list.head_node_ref().unwrap() }; |
| <span class="self">self</span>.map.insert(key, LruEntry::new(node_ref, value)); |
| } |
| is_none |
| } |
| |
| <span class="doccomment">/// Returns the value corresponding to the key. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>find(<span class="kw-2">&</span><span class="self">self</span>, key: u64) -> <span class="prelude-ty">Option</span><NodeRef<T>> { |
| <span class="self">self</span>.map.get(<span class="kw-2">&</span>key).map(|entry| entry.value.clone()) |
| } |
| |
| <span class="doccomment">/// Removes the first element and returns it, or `None` if the cache is emptry. |
| </span><span class="kw">pub fn </span>pop_front(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><NodeRef<T>> { |
| <span class="kw">let </span>key = <span class="self">self</span>.list.pop_front()<span class="question-mark">?</span>; |
| <span class="self">self</span>.map.remove(<span class="kw-2">&</span>key).map(|entry| entry.value) |
| } |
| |
| <span class="doccomment">/// Removes the last element and returns it, or `None` if the cache is emptry. |
| </span><span class="kw">pub fn </span>pop_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><NodeRef<T>> { |
| <span class="kw">let </span>key = <span class="self">self</span>.list.pop_back()<span class="question-mark">?</span>; |
| <span class="self">self</span>.map.remove(<span class="kw-2">&</span>key).map(|entry| entry.value) |
| } |
| |
| <span class="doccomment">/// Provides a reference to the front element, or `None` if the cache is empty. |
| </span><span class="kw">pub fn </span>front(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>NodeRef<T>> { |
| <span class="kw">let </span>key = <span class="self">self</span>.list.front()<span class="question-mark">?</span>; |
| <span class="self">self</span>.map.get(key).map(|entry| <span class="kw-2">&</span>entry.value) |
| } |
| |
| <span class="doccomment">/// Provides a reference to the back element, or `None` if the cache is empty. |
| </span><span class="kw">pub fn </span>back(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>NodeRef<T>> { |
| <span class="kw">let </span>key = <span class="self">self</span>.list.back()<span class="question-mark">?</span>; |
| <span class="self">self</span>.map.get(key).map(|entry| <span class="kw-2">&</span>entry.value) |
| } |
| |
| <span class="doccomment">/// Move the element corresponding to the key to the head. |
| </span><span class="kw">pub fn </span>move_to_head(<span class="kw-2">&mut </span><span class="self">self</span>, key: u64) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(entry) = <span class="self">self</span>.map.get_mut(<span class="kw-2">&</span>key) { |
| <span class="kw">unsafe </span>{ |
| <span class="self">self</span>.list.move_to_head(entry.node_ref); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Move the element corresponding to the key to the tail. |
| </span><span class="kw">pub fn </span>move_to_tail(<span class="kw-2">&mut </span><span class="self">self</span>, key: u64) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(entry) = <span class="self">self</span>.map.get_mut(<span class="kw-2">&</span>key) { |
| <span class="kw">unsafe </span>{ |
| <span class="self">self</span>.list.move_to_tail(entry.node_ref); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Change the number of key-value pairs the cache can hold. |
| </span><span class="kw">pub fn </span>change_capacity(<span class="kw-2">&mut </span><span class="self">self</span>, capacity: usize) { |
| <span class="kw">if </span>capacity < <span class="self">self</span>.len() { |
| <span class="kw">for _ in </span>capacity..<span class="self">self</span>.len() { |
| <span class="kw">let _ </span>= <span class="self">self</span>.pop_back(); |
| } |
| } |
| <span class="self">self</span>.max_size = capacity; |
| } |
| |
| <span class="doccomment">/// Removes all elements from the cache. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>clear(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.list.clear(); |
| <span class="self">self</span>.map.clear(); |
| } |
| |
| <span class="doccomment">/// Provides a forward iterator. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>iter(<span class="kw-2">&</span><span class="self">self</span>) -> Iter<<span class="lifetime">'_</span>, T> { |
| Iter { |
| iter: <span class="self">self</span>.list.iter(), |
| map: <span class="kw-2">&</span><span class="self">self</span>.map, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, T> Iterator <span class="kw">for </span>Iter<<span class="lifetime">'a</span>, T> { |
| <span class="kw">type </span>Item = <span class="kw-2">&</span><span class="lifetime">'a </span>NodeRef<T>; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">let </span>key = <span class="self">self</span>.iter.next()<span class="question-mark">?</span>; |
| <span class="self">self</span>.map.get(key).map(|entry| <span class="kw-2">&</span>entry.value) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="self">self</span>.iter.size_hint() |
| } |
| } |
| |
| <span class="kw">impl</span><T> DoubleEndedIterator <span class="kw">for </span>Iter<<span class="lifetime">'_</span>, T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="kw">let </span>(len, <span class="kw">_</span>) = <span class="self">self</span>.iter.size_hint(); |
| <span class="kw">if </span>len == <span class="number">0 </span>{ |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">let </span>key = <span class="self">self</span>.iter.next_back()<span class="question-mark">?</span>; |
| <span class="self">self</span>.map.get(key).map(|entry| <span class="kw-2">&</span>entry.value) |
| } |
| } |
| } |
| |
| <span class="kw">pub struct </span>IntoIter<T> { |
| cache: LruCache<T>, |
| } |
| |
| <span class="kw">impl</span><T> Iterator <span class="kw">for </span>IntoIter<T> { |
| <span class="kw">type </span>Item = NodeRef<T>; |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.cache.pop_front() |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| (<span class="self">self</span>.cache.len(), <span class="prelude-val">Some</span>(<span class="self">self</span>.cache.len())) |
| } |
| } |
| |
| <span class="kw">impl</span><T> DoubleEndedIterator <span class="kw">for </span>IntoIter<T> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>next_back(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>::Item> { |
| <span class="self">self</span>.cache.pop_back() |
| } |
| } |
| |
| <span class="kw">impl</span><T> IntoIterator <span class="kw">for </span>LruCache<T> { |
| <span class="kw">type </span>Item = NodeRef<T>; |
| <span class="kw">type </span>IntoIter = IntoIter<T>; |
| |
| <span class="doccomment">/// Consumes the list into an iterator yielding elements by value. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>into_iter(<span class="self">self</span>) -> IntoIter<T> { |
| IntoIter { cache: <span class="self">self </span>} |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="sgx_tprotected_fs" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
