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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="Extends log `Event`s to provide complete `Metadata`."><title>NormalizeEvent in tracing_log - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.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-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="tracing_log" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-df360f571f6edeae.css"></noscript><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 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_log/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_log/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../tracing_log/index.html">tracing_log</a><span class="version">0.2.0</span></h2></div><h2 class="location"><a href="#">NormalizeEvent</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.is_log">is_log</a></li><li><a href="#tymethod.normalized_metadata">normalized_metadata</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-NormalizeEvent%3C'a%3E-for-Event%3C'a%3E">Event&lt;&#x27;a&gt;</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In crate tracing_log</a></h2></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"><h1>Trait <a href="index.html">tracing_log</a>::<wbr><a class="trait" href="#">NormalizeEvent</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../src/tracing_log/lib.rs.html#455-464">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub trait NormalizeEvent&lt;'a&gt;: Sealed {
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// Required methods
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fn <a href="#tymethod.normalized_metadata" class="fn">normalized_metadata</a>(&amp;'a self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'a&gt;&gt;;
<span class="item-spacer"></span> fn <a href="#tymethod.is_log" class="fn">is_log</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</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>Extends log <code>Event</code>s to provide complete <code>Metadata</code>.</p>
<p>In <code>tracing-log</code>, an <code>Event</code> produced by a log (through <a href="trait.AsTrace.html" title="trait tracing_log::AsTrace"><code>AsTrace</code></a>) has an hard coded
“log” target and no <code>file</code>, <code>line</code>, or <code>module_path</code> attributes. This happens because <code>Event</code>
requires its <code>Metadata</code> to be <code>'static</code>, while <a href="../log/struct.Record.html" title="struct log::Record"><code>log::Record</code></a>s provide them with a generic
lifetime.</p>
<p>However, these values are stored in the <code>Event</code>’s fields and
the <a href="trait.NormalizeEvent.html#normalized_metadata" title="trait tracing_log::NormalizeEvent"><code>normalized_metadata</code></a> method allows to build a new <code>Metadata</code>
that only lives as long as its source <code>Event</code>, but provides complete
data.</p>
<p>It can typically be used by <code>Subscriber</code>s when processing an <code>Event</code>,
to allow accessing its complete metadata in a consistent way,
regardless of the source of its source.</p>
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</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.normalized_metadata" class="method"><a class="src rightside" href="../src/tracing_log/lib.rs.html#461">source</a><h4 class="code-header">fn <a href="#tymethod.normalized_metadata" class="fn">normalized_metadata</a>(&amp;'a self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'a&gt;&gt;</h4></section></summary><div class="docblock"><p>If this <code>Event</code> comes from a <code>log</code>, this method provides a new
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normalized <code>Metadata</code> which has all available attributes
from the original log, including <code>file</code>, <code>line</code>, <code>module_path</code>
and <code>target</code>.
Returns <code>None</code> is the <code>Event</code> is not issued from a <code>log</code>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.is_log" class="method"><a class="src rightside" href="../src/tracing_log/lib.rs.html#463">source</a><h4 class="code-header">fn <a href="#tymethod.is_log" class="fn">is_log</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns whether this <code>Event</code> represents a log (from the <code>log</code> crate)</p>
</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-NormalizeEvent%3C'a%3E-for-Event%3C'a%3E" class="impl"><a class="src rightside" href="../src/tracing_log/lib.rs.html#468-493">source</a><a href="#impl-NormalizeEvent%3C'a%3E-for-Event%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a&gt; <a class="trait" href="trait.NormalizeEvent.html" title="trait tracing_log::NormalizeEvent">NormalizeEvent</a>&lt;'a&gt; for <a class="struct" href="../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event">Event</a>&lt;'a&gt;</h3></section></summary><div class="impl-items"><section id="method.normalized_metadata" class="method trait-impl"><a class="src rightside" href="../src/tracing_log/lib.rs.html#469-488">source</a><a href="#method.normalized_metadata" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.normalized_metadata" class="fn">normalized_metadata</a>(&amp;'a self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a>&lt;'a&gt;&gt;</h4></section><section id="method.is_log" class="method trait-impl"><a class="src rightside" href="../src/tracing_log/lib.rs.html#490-492">source</a><a href="#method.is_log" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.is_log" class="fn">is_log</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/tracing_log/trait.NormalizeEvent.js" data-ignore-extern-crates="tracing_core" async></script></section></div></main></body></html>
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