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<!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 `actix-settings/src/settings/backlog.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>backlog.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="icon" href="https://actix.rs/favicon.ico"></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"></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../actix_settings/index.html">
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<img src="https://actix.rs/img/logo.png" alt="logo"></a><form class="search-form"><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></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="kw">use </span>std::fmt;
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<span class="kw">use </span>serde::de;
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<span class="kw">use crate</span>::{AsResult, Error, Parse};
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<span class="doccomment">/// The maximum number of pending connections.
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///
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/// This refers to the number of clients that can be waiting to be served. Exceeding this number
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/// results in the client getting an error when attempting to connect. It should only affect servers
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/// under significant load.
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///
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/// Generally set in the 64–2048 range. The default value is 2048. Takes a string value: Either
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/// "default", or an integer N > 0 e.g. "6".
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</span><span class="attribute">#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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</span><span class="kw">pub enum </span>Backlog {
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<span class="doccomment">/// The default number of connections. See struct docs.
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</span>Default,
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<span class="doccomment">/// A specific number of connections.
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</span>Manual(usize),
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}
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<span class="kw">impl </span>Parse <span class="kw">for </span>Backlog {
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<span class="kw">fn </span>parse(string: <span class="kw-2">&</span>str) -> AsResult<<span class="self">Self</span>> {
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<span class="kw">match </span>string {
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<span class="string">"default" </span>=> <span class="prelude-val">Ok</span>(Backlog::Default),
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string => <span class="kw">match </span>string.parse::<usize>() {
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<span class="prelude-val">Ok</span>(val) => <span class="prelude-val">Ok</span>(Backlog::Manual(val)),
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<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(<span class="macro">InvalidValue! </span>{
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expected: <span class="string">"an integer > 0"</span>,
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got: string,
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}),
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},
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}
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}
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}
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<span class="kw">impl</span><<span class="lifetime">'de</span>> de::Deserialize<<span class="lifetime">'de</span>> <span class="kw">for </span>Backlog {
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<span class="kw">fn </span>deserialize<D>(deserializer: D) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, D::Error>
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<span class="kw">where
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</span>D: de::Deserializer<<span class="lifetime">'de</span>>,
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{
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<span class="kw">struct </span>BacklogVisitor;
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<span class="kw">impl</span><<span class="lifetime">'de</span>> de::Visitor<<span class="lifetime">'de</span>> <span class="kw">for </span>BacklogVisitor {
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<span class="kw">type </span>Value = Backlog;
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<span class="kw">fn </span>expecting(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result {
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<span class="kw">let </span>msg = <span class="string">"Either \"default\" or a string containing an integer > 0"</span>;
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f.write_str(msg)
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}
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<span class="kw">fn </span>visit_str<E>(<span class="self">self</span>, value: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E>
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<span class="kw">where
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</span>E: de::Error,
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{
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<span class="kw">match </span>Backlog::parse(value) {
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<span class="prelude-val">Ok</span>(backlog) => <span class="prelude-val">Ok</span>(backlog),
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<span class="prelude-val">Err</span>(Error::InvalidValue { expected, got, .. }) => <span class="prelude-val">Err</span>(
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de::Error::invalid_value(de::Unexpected::Str(<span class="kw-2">&</span>got), <span class="kw-2">&</span>expected),
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),
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<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(),
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}
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}
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}
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deserializer.deserialize_string(BacklogVisitor)
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}
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}
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</code></pre></div>
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