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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 spans 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 spans <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 spans <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 spans <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>