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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>
<h3 id="using-the-span-registry"><a class="doc-anchor" href="#using-the-span-registry">§</a>Using the Span Registry</h3>
<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
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>
is used as the base <code>Subscriber</code> of a <code>Layer</code> stack, the
<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
<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
reasonable default for storing spans and events, other stores that implement
<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
by the per-span data they store) can be used as a drop-in replacement.</p>
<p>For example, we might create a <code>Registry</code> and add multiple <code>Layer</code>s like so:</p>
<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>};
<span class="kw">let </span>subscriber = Registry::default()
.with(FooLayer::new())
.with(BarLayer::new());</code></pre></div>
<p>If a type implementing <code>Layer</code> depends on the functionality of a <code>Registry</code>
implementation, it should bound its <code>Subscriber</code> type parameter with the
<a href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan"><code>LookupSpan</code></a> trait, like so:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::{registry, Layer};
<span class="kw">use </span>tracing_core::Subscriber;
<span class="kw">pub struct </span>MyLayer {
<span class="comment">// ...
</span>}
<span class="kw">impl</span>&lt;S&gt; Layer&lt;S&gt; <span class="kw">for </span>MyLayer
<span class="kw">where
</span>S: Subscriber + <span class="kw">for</span>&lt;<span class="lifetime">'a</span>&gt; registry::LookupSpan&lt;<span class="lifetime">'a</span>&gt;,
{
<span class="comment">// ...
</span>}</code></pre></div>
<p>When this bound is added, the <code>Layer</code> implementation will be guaranteed
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
require the root subscriber to be a registry.</p>
</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>

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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="Provides access to stored span data."><title>LookupSpan in 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 trait"><!--[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="#">Lookup<wbr>Span</a></h2><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Data" title="Data">Data</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.span_data" title="span_data">span_data</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.register_filter" title="register_filter">register_filter</a></li><li><a href="#method.span" title="span">span</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>registry</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>::<wbr><a href="index.html">registry</a></span><h1>Trait <span class="trait">LookupSpan</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#92-154">Source</a> </span></div><pre class="rust item-decl"><code>pub trait LookupSpan&lt;'a&gt; {
type <a href="#associatedtype.Data" class="associatedtype">Data</a>: <a class="trait" href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData">SpanData</a>&lt;'a&gt;;
// Required method
fn <a href="#tymethod.span_data" class="fn">span_data</a>(&amp;'a self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;Self::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>&gt;;
// Provided methods
fn <a href="#method.span" class="fn">span</a>(&amp;'a self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, Self&gt;&gt;
<span class="where">where Self: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span> { ... }
<span class="item-spacer"></span> fn <a href="#method.register_filter" class="fn">register_filter</a>(&amp;mut self) -&gt; <a class="struct" href="../filter/struct.FilterId.html" title="struct tracing_subscriber::filter::FilterId">FilterId</a> { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Provides access to stored span data.</p>
<p>Subscribers which store span data and associate it with span IDs should
implement this trait; if they do, any <a href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer"><code>Layer</code></a>s wrapping them can look up
metadata via the <a href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context"><code>Context</code></a> type’s <a href="../layer/struct.Context.html#method.span" title="method tracing_subscriber::layer::Context::span"><code>span()</code></a> method.</p>
</div></details><h2 id="required-associated-types" class="section-header">Required Associated Types<a href="#required-associated-types" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedtype.Data" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#94">Source</a><h4 class="code-header">type <a href="#associatedtype.Data" class="associatedtype">Data</a>: <a class="trait" href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData">SpanData</a>&lt;'a&gt;</h4></section></summary><div class="docblock"><p>The type of span data stored in this registry.</p>
</div></details></div><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.span_data" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#106">Source</a><h4 class="code-header">fn <a href="#tymethod.span_data" class="fn">span_data</a>(&amp;'a self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;Self::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>&gt;</h4></section></summary><div class="docblock"><p>Returns the <a href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData"><code>SpanData</code></a> for a given <code>Id</code>, if it exists.</p>
<pre class="ignore" style="white-space:normal;font:inherit;">
<strong>Note</strong>: users of the <code>LookupSpan</code> trait should
typically call the <a href="#method.span"><code>span</code></a> method rather
than this method. The <code>span</code> method is implemented by
<em>calling</em> <code>span_data</code>, but returns a reference which is
capable of performing more sophisiticated queries.
</pre>
</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.span" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#118-129">Source</a><h4 class="code-header">fn <a href="#method.span" class="fn">span</a>(&amp;'a self, id: &amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a>&lt;'a, Self&gt;&gt;<div class="where">where
Self: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Returns a <a href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef"><code>SpanRef</code></a> for the span with the given <code>Id</code>, if it exists.</p>
<p>A <code>SpanRef</code> is similar to <a href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData"><code>SpanData</code></a>, but it allows performing
additional lookups against the registryr that stores the wrapped data.</p>
<p>In general, <em>users</em> of the <code>LookupSpan</code> trait should use this method
rather than the <a href="trait.LookupSpan.html#tymethod.span_data" title="method tracing_subscriber::registry::LookupSpan::span_data"><code>span_data</code></a> method; while <em>implementors</em> of this trait
should only implement <code>span_data</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.register_filter" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#148-153">Source</a><h4 class="code-header">fn <a href="#method.register_filter" class="fn">register_filter</a>(&amp;mut self) -&gt; <a class="struct" href="../filter/struct.FilterId.html" title="struct tracing_subscriber::filter::FilterId">FilterId</a></h4></section></summary><div class="docblock"><p>Registers a <a href="../layer/trait.Filter.html" title="trait tracing_subscriber::layer::Filter"><code>Filter</code></a> for <a href="../layer/trait.Layer.html#per-layer-filtering" title="trait tracing_subscriber::layer::Layer">per-layer filtering</a> with this
<a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a>.</p>
<p>The <a href="../layer/trait.Filter.html" title="trait tracing_subscriber::layer::Filter"><code>Filter</code></a> can then use the returned <a href="../filter/struct.FilterId.html" title="struct tracing_subscriber::filter::FilterId"><code>FilterId</code></a> to
<a href="trait.SpanData.html#method.is_enabled_for" title="method tracing_subscriber::registry::SpanData::is_enabled_for">check if it previously enabled a span</a>.</p>
<h5 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h5>
<p>If this <code>Subscriber</code> does not support <a href="../layer/trait.Layer.html#per-layer-filtering" title="trait tracing_subscriber::layer::Layer">per-layer filtering</a>.</p>
</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><details class="toggle implementors-toggle"><summary><section id="impl-LookupSpan%3C'a%3E-for-Registry" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/registry/sharded.rs.html#369-382">Source</a><a href="#impl-LookupSpan%3C'a%3E-for-Registry" class="anchor">§</a><h3 class="code-header">impl&lt;'a&gt; <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt; for <a class="struct" href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a></h3></section></summary><div class="impl-items"><section id="associatedtype.Data-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/registry/sharded.rs.html#370">Source</a><a href="#associatedtype.Data-1" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Data" class="associatedtype">Data</a> = <a class="struct" href="struct.Data.html" title="struct tracing_subscriber::registry::Data">Data</a>&lt;'a&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-LookupSpan%3C'a%3E-for-Layered%3CL,+S%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/layered.rs.html#385-399">Source</a><a href="#impl-LookupSpan%3C'a%3E-for-Layered%3CL,+S%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, L, S&gt; <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt; for <a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;L, S&gt;<div class="where">where
S: <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a> + <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Data-2" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/layered.rs.html#389">Source</a><a href="#associatedtype.Data-2" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Data" class="associatedtype">Data</a> = &lt;S as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-LookupSpan%3C'a%3E-for-Subscriber%3CN,+E,+F,+W%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#451-460">Source</a><a href="#impl-LookupSpan%3C'a%3E-for-Subscriber%3CN,+E,+F,+W%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, N, E, F, W&gt; <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt; for <a class="struct" href="../fmt/struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a>&lt;N, E, F, W&gt;<div class="where">where
<a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;F, <a class="type" href="../fmt/type.Formatter.html" title="type tracing_subscriber::fmt::Formatter">Formatter</a>&lt;N, E, W&gt;&gt;: <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Data-3" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/mod.rs.html#455">Source</a><a href="#associatedtype.Data-3" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Data" class="associatedtype">Data</a> = &lt;<a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;F, <a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a>&lt;<a class="struct" href="../fmt/struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a>&lt;<a class="struct" href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>, N, E, W&gt;, <a class="struct" href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>&gt;&gt; as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a>&lt;'a&gt;&gt;::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a></h4></section></div></details></div><script src="../../trait.impl/tracing_subscriber/registry/trait.LookupSpan.js" async></script></section></div></main></body></html>

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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="A stored representation of data associated with a span."><title>SpanData in 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 trait"><!--[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="#">Span<wbr>Data</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.extensions" title="extensions">extensions</a></li><li><a href="#tymethod.extensions_mut" title="extensions_mut">extensions_mut</a></li><li><a href="#tymethod.id" title="id">id</a></li><li><a href="#tymethod.metadata" title="metadata">metadata</a></li><li><a href="#tymethod.parent" title="parent">parent</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.is_enabled_for" title="is_enabled_for">is_enabled_for</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>registry</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>::<wbr><a href="index.html">registry</a></span><h1>Trait <span class="trait">SpanData</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#157-199">Source</a> </span></div><pre class="rust item-decl"><code>pub trait SpanData&lt;'a&gt; {
// Required methods
fn <a href="#tymethod.id" class="fn">id</a>(&amp;self) -&gt; <a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>;
<span class="item-spacer"></span> fn <a href="#tymethod.metadata" class="fn">metadata</a>(&amp;self) -&gt; &amp;'static <a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'static&gt;;
<span class="item-spacer"></span> fn <a href="#tymethod.parent" class="fn">parent</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>&gt;;
<span class="item-spacer"></span> fn <a href="#tymethod.extensions" class="fn">extensions</a>(&amp;self) -&gt; <a class="struct" href="struct.Extensions.html" title="struct tracing_subscriber::registry::Extensions">Extensions</a>&lt;'_&gt;;
<span class="item-spacer"></span> fn <a href="#tymethod.extensions_mut" class="fn">extensions_mut</a>(&amp;self) -&gt; <a class="struct" href="struct.ExtensionsMut.html" title="struct tracing_subscriber::registry::ExtensionsMut">ExtensionsMut</a>&lt;'_&gt;;
// Provided method
fn <a href="#method.is_enabled_for" class="fn">is_enabled_for</a>(&amp;self, filter: <a class="struct" href="../filter/struct.FilterId.html" title="struct tracing_subscriber::filter::FilterId">FilterId</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.bool.html">bool</a> { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A stored representation of data associated with a span.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.id" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#159">Source</a><h4 class="code-header">fn <a href="#tymethod.id" class="fn">id</a>(&amp;self) -&gt; <a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a></h4></section></summary><div class="docblock"><p>Returns this span’s ID.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.metadata" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#162">Source</a><h4 class="code-header">fn <a href="#tymethod.metadata" class="fn">metadata</a>(&amp;self) -&gt; &amp;'static <a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'static&gt;</h4></section></summary><div class="docblock"><p>Returns a reference to the span’s <code>Metadata</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.parent" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#165">Source</a><h4 class="code-header">fn <a href="#tymethod.parent" class="fn">parent</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>&gt;</h4></section></summary><div class="docblock"><p>Returns a reference to the ID</p>
</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.extensions" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#173">Source</a><h4 class="code-header">fn <a href="#tymethod.extensions" class="fn">extensions</a>(&amp;self) -&gt; <a class="struct" href="struct.Extensions.html" title="struct tracing_subscriber::registry::Extensions">Extensions</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Returns a reference to this span’s <code>Extensions</code>.</p>
<p>The extensions may be used by <code>Layer</code>s to store additional data
describing the span.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.extensions_mut" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#181">Source</a><h4 class="code-header">fn <a href="#tymethod.extensions_mut" class="fn">extensions_mut</a>(&amp;self) -&gt; <a class="struct" href="struct.ExtensionsMut.html" title="struct tracing_subscriber::registry::ExtensionsMut">ExtensionsMut</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Returns a mutable reference to this span’s <code>Extensions</code>.</p>
<p>The extensions may be used by <code>Layer</code>s to store additional data
describing the span.</p>
</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.is_enabled_for" class="method"><a class="src rightside" href="../../src/tracing_subscriber/registry/mod.rs.html#195-198">Source</a><h4 class="code-header">fn <a href="#method.is_enabled_for" class="fn">is_enabled_for</a>(&amp;self, filter: <a class="struct" href="../filter/struct.FilterId.html" title="struct tracing_subscriber::filter::FilterId">FilterId</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if this span is enabled for the <a href="../layer/trait.Layer.html#per-layer-filtering" title="trait tracing_subscriber::layer::Layer">per-layer filter</a>
corresponding to the provided <a href="../filter/struct.FilterId.html" title="struct tracing_subscriber::filter::FilterId"><code>FilterId</code></a>.</p>
<h6 id="default-implementation"><a class="doc-anchor" href="#default-implementation">§</a>Default Implementation</h6>
<p>By default, this method assumes that the <a href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan"><code>LookupSpan</code></a> implementation
does not support <a href="../layer/trait.Layer.html#per-layer-filtering" title="trait tracing_subscriber::layer::Layer">per-layer filtering</a>, and always returns <code>true</code>.</p>
</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-SpanData%3C'a%3E-for-Data%3C'a%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/registry/sharded.rs.html#419-444">Source</a><a href="#impl-SpanData%3C'a%3E-for-Data%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a&gt; <a class="trait" href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData">SpanData</a>&lt;'a&gt; for <a class="struct" href="struct.Data.html" title="struct tracing_subscriber::registry::Data">Data</a>&lt;'a&gt;</h3></section></div><script src="../../trait.impl/tracing_subscriber/registry/trait.SpanData.js" async></script></section></div></main></body></html>