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tracing_subscriber/registry/trait.LookupSpan.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<'a> {
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type <a href="#associatedtype.Data" class="associatedtype">Data</a>: <a class="trait" href="trait.SpanData.html" title="trait tracing_subscriber::registry::SpanData">SpanData</a><'a>;
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// Required method
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fn <a href="#tymethod.span_data" class="fn">span_data</a>(&'a self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>>;
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// Provided methods
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fn <a href="#method.span" class="fn">span</a>(&'a self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a><'a, Self>>
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<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> { ... }
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<span class="item-spacer"></span> fn <a href="#method.register_filter" class="fn">register_filter</a>(&mut self) -> <a class="struct" href="../filter/struct.FilterId.html" title="struct tracing_subscriber::filter::FilterId">FilterId</a> { ... }
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}</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>
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<p>Subscribers which store span data and associate it with span IDs should
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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
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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>
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</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><'a></h4></section></summary><div class="docblock"><p>The type of span data stored in this registry.</p>
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</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>(&'a self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="trait.LookupSpan.html#associatedtype.Data" title="type tracing_subscriber::registry::LookupSpan::Data">Data</a>></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>
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<pre class="ignore" style="white-space:normal;font:inherit;">
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<strong>Note</strong>: users of the <code>LookupSpan</code> trait should
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typically call the <a href="#method.span"><code>span</code></a> method rather
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than this method. The <code>span</code> method is implemented by
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<em>calling</em> <code>span_data</code>, but returns a reference which is
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capable of performing more sophisiticated queries.
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</pre>
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</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>(&'a self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.SpanRef.html" title="struct tracing_subscriber::registry::SpanRef">SpanRef</a><'a, Self>><div class="where">where
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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>
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<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
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additional lookups against the registryr that stores the wrapped data.</p>
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<p>In general, <em>users</em> of the <code>LookupSpan</code> trait should use this method
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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
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should only implement <code>span_data</code>.</p>
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</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>(&mut self) -> <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
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<a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a>.</p>
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<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
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<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>
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<h5 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h5>
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<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>
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</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<'a> <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a> 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><'a></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<'a, L, S> <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a> for <a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a><L, S><div class="where">where
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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><'a>,</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> = <S as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a>>::<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<'a, N, E, F, W> <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a> for <a class="struct" href="../fmt/struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber">Subscriber</a><N, E, F, W><div class="where">where
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<a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a><F, <a class="type" href="../fmt/type.Formatter.html" title="type tracing_subscriber::fmt::Formatter">Formatter</a><N, E, W>>: <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a>,</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> = <<a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a><F, <a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a><<a class="struct" href="../fmt/struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><<a class="struct" href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>, N, E, W>, <a class="struct" href="struct.Registry.html" title="struct tracing_subscriber::registry::Registry">Registry</a>>> as <a class="trait" href="trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a>>::<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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