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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><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.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="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.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">☰</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_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">Module registry</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li></ul></section><h2><a href="../index.html">In crate tracing_subscriber</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../tracing_subscriber/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../index.html">tracing_subscriber</a>::<wbr><a class="mod" href="#">registry</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/tracing_subscriber/registry/mod.rs.html#1-598">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></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 href="#using-the-span-registry">Using the Span Registry</a></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"><a href="#structs">Structs</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">ExtensionsMut</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">ScopeFromRoot</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"><a href="#traits">Traits</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</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">SpanData</a></div><div class="desc docblock-short">A stored representation of data associated with a span.</div></li></ul></section></div></main></body></html>
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