| <!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/tower-0.4.13/src/balance/p2c/layer.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>layer.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="../../../../tower/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="../../../../tower/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="kw">use </span><span class="kw">super</span>::MakeBalance; |
| <span class="kw">use </span>std::{fmt, marker::PhantomData}; |
| <span class="kw">use </span>tower_layer::Layer; |
| |
| <span class="doccomment">/// Construct load balancers ([`Balance`]) over dynamic service sets ([`Discover`]) produced by the |
| /// "inner" service in response to requests coming from the "outer" service. |
| /// |
| /// This construction may seem a little odd at first glance. This is not a layer that takes |
| /// requests and produces responses in the traditional sense. Instead, it is more like |
| /// [`MakeService`] in that it takes service _descriptors_ (see `Target` on [`MakeService`]) |
| /// and produces _services_. Since [`Balance`] spreads requests across a _set_ of services, |
| /// the inner service should produce a [`Discover`], not just a single |
| /// [`Service`], given a service descriptor. |
| /// |
| /// See the [module-level documentation](crate::balance) for details on load balancing. |
| /// |
| /// [`Balance`]: crate::balance::p2c::Balance |
| /// [`Discover`]: crate::discover::Discover |
| /// [`MakeService`]: crate::MakeService |
| /// [`Service`]: crate::Service |
| </span><span class="kw">pub struct </span>MakeBalanceLayer<D, Req> { |
| _marker: PhantomData<<span class="kw">fn</span>(D, Req)>, |
| } |
| |
| <span class="kw">impl</span><D, Req> MakeBalanceLayer<D, Req> { |
| <span class="doccomment">/// Build balancers using operating system entropy. |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| _marker: PhantomData, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><D, Req> Default <span class="kw">for </span>MakeBalanceLayer<D, Req> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::new() |
| } |
| } |
| |
| <span class="kw">impl</span><D, Req> Clone <span class="kw">for </span>MakeBalanceLayer<D, Req> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| _marker: PhantomData, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><S, Req> Layer<S> <span class="kw">for </span>MakeBalanceLayer<S, Req> { |
| <span class="kw">type </span>Service = MakeBalance<S, Req>; |
| |
| <span class="kw">fn </span>layer(<span class="kw-2">&</span><span class="self">self</span>, make_discover: S) -> <span class="self">Self</span>::Service { |
| MakeBalance::new(make_discover) |
| } |
| } |
| |
| <span class="kw">impl</span><D, Req> fmt::Debug <span class="kw">for </span>MakeBalanceLayer<D, Req> { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| f.debug_struct(<span class="string">"MakeBalanceLayer"</span>).finish() |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tower" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
