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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="Storage for span data shared by multiple `Layer`s."><title>tracing_subscriber::registry - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.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" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing_subscriber/index.html">tracing_<wbr>subscriber</a><span class="version">0.3.19</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module registry</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#using-the-span-registry" title="Using the Span Registry">Using the Span Registry</a></li></ul><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#traits" title="Traits">Traits</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate tracing_<wbr>subscriber</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../index.html">tracing_subscriber</a></span><h1>Module <span>registry</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/tracing_subscriber/registry/mod.rs.html#1-598">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Storage for span data shared by multiple <a href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer"><code>Layer</code></a>s.</p>
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<h3 id="using-the-span-registry"><a class="doc-anchor" href="#using-the-span-registry">§</a>Using the Span Registry</h3>
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<p>This module provides the <a href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry"><code>Registry</code></a> type, a <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> implementation
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which tracks per-span data and exposes it to <a href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer"><code>Layer</code></a>s. When a <code>Registry</code>
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is used as the base <code>Subscriber</code> of a <code>Layer</code> stack, the
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<a href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context"><code>layer::Context</code></a> type will provide methods allowing <code>Layer</code>s to
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<a href="../layer/struct.Context.html#method.span" title="method tracing_subscriber::layer::Context::span">look up span data</a> stored in the registry. While <a href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry"><code>Registry</code></a> is a
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reasonable default for storing spans and events, other stores that implement
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<a href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan"><code>LookupSpan</code></a> and <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> themselves (with <a href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData"><code>SpanData</code></a> implemented
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by the per-span data they store) can be used as a drop-in replacement.</p>
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<p>For example, we might create a <code>Registry</code> and add multiple <code>Layer</code>s like so:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::{registry::Registry, Layer, prelude::<span class="kw-2">*</span>};
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<span class="kw">let </span>subscriber = Registry::default()
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.with(FooLayer::new())
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.with(BarLayer::new());</code></pre></div>
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<p>If a type implementing <code>Layer</code> depends on the functionality of a <code>Registry</code>
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implementation, it should bound its <code>Subscriber</code> type parameter with the
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<a href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan"><code>LookupSpan</code></a> trait, like so:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::{registry, Layer};
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<span class="kw">use </span>tracing_core::Subscriber;
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<span class="kw">pub struct </span>MyLayer {
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<span class="comment">// ...
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</span>}
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<span class="kw">impl</span><S> Layer<S> <span class="kw">for </span>MyLayer
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<span class="kw">where
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</span>S: Subscriber + <span class="kw">for</span><<span class="lifetime">'a</span>> registry::LookupSpan<<span class="lifetime">'a</span>>,
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{
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<span class="comment">// ...
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</span>}</code></pre></div>
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<p>When this bound is added, the <code>Layer</code> implementation will be guaranteed
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access to the <a href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context"><code>Context</code></a> methods, such as <a href="../layer/struct.Context.html#method.span" title="method tracing_subscriber::layer::Context::span"><code>Context::span</code></a>, that
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require the root subscriber to be a registry.</p>
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</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Data.html" title="struct tracing_subscriber::registry::Data">Data</a></div><div class="desc docblock-short">Span data stored in a <a href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry"><code>Registry</code></a>.</div></li><li><div class="item-name"><a class="struct" href="struct.Extensions.html" title="struct tracing_subscriber::registry::Extensions">Extensions</a></div><div class="desc docblock-short">An immutable, read-only reference to a Span’s extensions.</div></li><li><div class="item-name"><a class="struct" href="struct.ExtensionsMut.html" title="struct tracing_subscriber::registry::ExtensionsMut">Extensions<wbr>Mut</a></div><div class="desc docblock-short">An mutable reference to a Span’s extensions.</div></li><li><div class="item-name"><a class="struct" href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a></div><div class="desc docblock-short">A shared, reusable store for spans.</div></li><li><div class="item-name"><a class="struct" href="struct.Scope.html" title="struct tracing_subscriber::registry::Scope">Scope</a></div><div class="desc docblock-short">An iterator over the parents of a span, ordered from leaf to root.</div></li><li><div class="item-name"><a class="struct" href="struct.ScopeFromRoot.html" title="struct tracing_subscriber::registry::ScopeFromRoot">Scope<wbr>From<wbr>Root</a></div><div class="desc docblock-short">An iterator over the parents of a span, ordered from root to leaf.</div></li><li><div class="item-name"><a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a></div><div class="desc docblock-short">A reference to [span data] and the associated <a href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">registry</a>.</div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">Lookup<wbr>Span</a></div><div class="desc docblock-short">Provides access to stored span data.</div></li><li><div class="item-name"><a class="trait" href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData">Span<wbr>Data</a></div><div class="desc docblock-short">A stored representation of data associated with a span.</div></li></ul></section></div></main></body></html> |