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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="Layer is used to intercept the operations on the underlying storage."><title>Layer in object_store::layers::mock - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.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"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="object_store" data-themes="" data-resource-suffix="" data-rustdoc-version="1.96.0-nightly (ac7f9ec7d 2026-03-20)" data-channel="nightly" data-search-js="search-63369b7b.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-5013f961.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc trait"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Layer</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../object_store/index.html">object_<wbr>store</a><span class="version">1.0.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Layer</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#notes" title="Notes">Notes</a><ul><li><a href="#inner" title="Inner">Inner</a></li></ul></li><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.LayeredAccess" title="LayeredAccess">LayeredAccess</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.layer" title="layer">layer</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-Layer%3CA%3E-for-MetricsLayer%3CI%3E" title="MetricsLayer<I>">MetricsLayer<I></a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In object_<wbr>store::<wbr>layers::<wbr>mock</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../index.html">object_store</a>::<wbr><a href="../index.html">layers</a>::<wbr><a href="index.html">mock</a></div><h1>Trait <span class="trait">Layer</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"></span></div><pre class="rust item-decl"><code>pub trait Layer<A><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,</div>{
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type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a>: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>;
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// Required method
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fn <a href="#tymethod.layer" class="fn">layer</a>(&self, inner: A) -> Self::<a class="associatedtype" href="trait.Layer.html#associatedtype.LayeredAccess" title="type object_store::layers::mock::Layer::LayeredAccess">LayeredAccess</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>Layer is used to intercept the operations on the underlying storage.</p>
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<p>Struct that implement this trait must accept input <code>Arc<dyn Accessor></code> as inner,
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and returns a new <code>Arc<dyn Accessor></code> as output.</p>
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<p>All functions in <code>Accessor</code> requires <code>&self</code>, so it’s implementer’s responsibility
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to maintain the internal mutability. Please also keep in mind that <code>Accessor</code>
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requires <code>Send</code> and <code>Sync</code>.</p>
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<h2 id="notes"><a class="doc-anchor" href="#notes">§</a>Notes</h2><h3 id="inner"><a class="doc-anchor" href="#inner">§</a>Inner</h3>
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<p>It’s required to implement <code>fn inner() -> Option<Arc<dyn Accessor>></code> for layer’s accessors.</p>
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<p>By implement this method, all API calls will be forwarded to inner accessor instead.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Arc;
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<span class="kw">use </span>opendal_core::raw::<span class="kw-2">*</span>;
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<span class="kw">use </span>opendal_core::<span class="kw-2">*</span>;
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<span class="doccomment">/// Implement the real accessor logic here.
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</span><span class="attr">#[derive(Debug)]
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</span><span class="kw">struct </span>TraceAccessor<A: Access> {
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inner: A,
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}
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<span class="kw">impl</span><A: Access> LayeredAccess <span class="kw">for </span>TraceAccessor<A> {
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<span class="kw">type </span>Inner = A;
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<span class="kw">type </span>Reader = A::Reader;
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<span class="kw">type </span>Writer = A::Writer;
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<span class="kw">type </span>Lister = A::Lister;
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<span class="kw">type </span>Deleter = A::Deleter;
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<span class="kw">fn </span>inner(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self</span>::Inner {
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<span class="kw-2">&</span><span class="self">self</span>.inner
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}
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<span class="kw">async fn </span>read(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>str, args: OpRead) -> <span class="prelude-ty">Result</span><(RpRead, <span class="self">Self</span>::Reader)> {
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<span class="self">self</span>.inner.read(path, args).<span class="kw">await
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</span>}
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<span class="kw">async fn </span>write(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>str, args: OpWrite) -> <span class="prelude-ty">Result</span><(RpWrite, <span class="self">Self</span>::Writer)> {
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<span class="self">self</span>.inner.write(path, args).<span class="kw">await
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</span>}
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<span class="kw">async fn </span>list(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>str, args: OpList) -> <span class="prelude-ty">Result</span><(RpList, <span class="self">Self</span>::Lister)> {
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<span class="self">self</span>.inner.list(path, args).<span class="kw">await
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</span>}
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<span class="kw">async fn </span>delete(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(RpDelete, <span class="self">Self</span>::Deleter)> {
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<span class="self">self</span>.inner.delete().<span class="kw">await
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</span>}
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}
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<span class="doccomment">/// The public struct that exposed to users.
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///
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/// Will be used like `op.layer(TraceLayer)`
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</span><span class="kw">struct </span>TraceLayer;
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<span class="kw">impl</span><A: Access> Layer<A> <span class="kw">for </span>TraceLayer {
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<span class="kw">type </span>LayeredAccess = TraceAccessor<A>;
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<span class="kw">fn </span>layer(<span class="kw-2">&</span><span class="self">self</span>, inner: A) -> <span class="self">Self</span>::LayeredAccess {
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TraceAccessor { inner }
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}
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}</code></pre></div></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.LayeredAccess" class="method"><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a>: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a></h4></section></summary><div class="docblock"><p>The layered accessor that returned by this layer.</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.layer" class="method"><h4 class="code-header">fn <a href="#tymethod.layer" class="fn">layer</a>(&self, inner: A) -> Self::<a class="associatedtype" href="trait.Layer.html#associatedtype.LayeredAccess" title="type object_store::layers::mock::Layer::LayeredAccess">LayeredAccess</a></h4></section></summary><div class="docblock"><p>Intercept the operations on the underlying storage.</p>
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</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-Layer%3CA%3E-for-MetricsLayer%3CI%3E" class="impl"><a href="#impl-Layer%3CA%3E-for-MetricsLayer%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<A, I> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for MetricsLayer<I><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,
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I: MetricsIntercept,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-1" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-1" class="anchor">§</a><h4 class="code-header">type <a class="associatedtype">LayeredAccess</a> = MetricsAccessor<A, I></h4></section><section id="method.layer" class="method trait-impl"><a href="#method.layer" class="anchor">§</a><h4 class="code-header">fn <a class="fn">layer</a>(&self, inner: A) -> <MetricsLayer<I> as <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A>>::<a class="associatedtype" href="trait.Layer.html#associatedtype.LayeredAccess" title="type object_store::layers::mock::Layer::LayeredAccess">LayeredAccess</a></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><div class="negative-marker"></div><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-HttpClientLayer" class="impl"><a href="#impl-Layer%3CA%3E-for-HttpClientLayer" class="anchor">§</a><h3 class="code-header">impl<A> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="../struct.HttpClientLayer.html" title="struct object_store::layers::HttpClientLayer">HttpClientLayer</a><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-2" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-2" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = HttpClientAccessor<A></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-PrometheusLayer" class="impl"><a href="#impl-Layer%3CA%3E-for-PrometheusLayer" class="anchor">§</a><h3 class="code-header">impl<A> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="../struct.PrometheusLayer.html" title="struct object_store::layers::PrometheusLayer">PrometheusLayer</a><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-3" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-3" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = MetricsAccessor<A, PrometheusInterceptor></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-SimulateLayer" class="impl"><a href="#impl-Layer%3CA%3E-for-SimulateLayer" class="anchor">§</a><h3 class="code-header">impl<A> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="../struct.SimulateLayer.html" title="struct object_store::layers::SimulateLayer">SimulateLayer</a><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-4" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-4" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = SimulateAccessor<A></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-TimeoutLayer" class="impl"><a href="#impl-Layer%3CA%3E-for-TimeoutLayer" class="anchor">§</a><h3 class="code-header">impl<A> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="../struct.TimeoutLayer.html" title="struct object_store::layers::TimeoutLayer">TimeoutLayer</a><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-5" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-5" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = TimeoutAccessor<A></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-TracingLayer" class="impl"><a href="#impl-Layer%3CA%3E-for-TracingLayer" class="anchor">§</a><h3 class="code-header">impl<A> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="../struct.TracingLayer.html" title="struct object_store::layers::TracingLayer">TracingLayer</a><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-6" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-6" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = TracingAccessor<A></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-LoggingLayer%3CI%3E" class="impl"><a href="#impl-Layer%3CA%3E-for-LoggingLayer%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<A, I> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="../struct.LoggingLayer.html" title="struct object_store::layers::LoggingLayer">LoggingLayer</a><I><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,
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I: <a class="trait" href="../trait.LoggingInterceptor.html" title="trait object_store::layers::LoggingInterceptor">LoggingInterceptor</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-7" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-7" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = LoggingAccessor<A, I></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-RetryLayer%3CI%3E" class="impl"><a href="#impl-Layer%3CA%3E-for-RetryLayer%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<A, I> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="../struct.RetryLayer.html" title="struct object_store::layers::RetryLayer">RetryLayer</a><I><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,
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I: <a class="trait" href="../trait.RetryInterceptor.html" title="trait object_store::layers::RetryInterceptor">RetryInterceptor</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-8" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-8" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = RetryAccessor<A, I></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-ConcurrentLimitLayer%3CS%3E" class="impl"><a href="#impl-Layer%3CA%3E-for-ConcurrentLimitLayer%3CS%3E" class="anchor">§</a><h3 class="code-header">impl<A, S> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="../struct.ConcurrentLimitLayer.html" title="struct object_store::layers::ConcurrentLimitLayer">ConcurrentLimitLayer</a><S><div class="where">where
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A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>,
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S: <a class="trait" href="../trait.ConcurrentLimitSemaphore.html" title="trait object_store::layers::ConcurrentLimitSemaphore">ConcurrentLimitSemaphore</a>,
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<S as <a class="trait" href="../trait.ConcurrentLimitSemaphore.html" title="trait object_store::layers::ConcurrentLimitSemaphore">ConcurrentLimitSemaphore</a>>::<a class="associatedtype" href="../trait.ConcurrentLimitSemaphore.html#associatedtype.Permit" title="type object_store::layers::ConcurrentLimitSemaphore::Permit">Permit</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-9" class="associatedtype trait-impl"><a href="#associatedtype.LayeredAccess-9" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = ConcurrentLimitAccessor<A, S></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Layer%3CA%3E-for-MockLayer" class="impl"><a class="src rightside" href="../../../src/object_store/layers/mock.rs.html#59-72">Source</a><a href="#impl-Layer%3CA%3E-for-MockLayer" class="anchor">§</a><h3 class="code-header">impl<A: <a class="trait" href="../../trait.Access.html" title="trait object_store::Access">Access</a>> <a class="trait" href="trait.Layer.html" title="trait object_store::layers::mock::Layer">Layer</a><A> for <a class="struct" href="struct.MockLayer.html" title="struct object_store::layers::mock::MockLayer">MockLayer</a></h3></section></summary><div class="impl-items"><section id="associatedtype.LayeredAccess-10" class="associatedtype trait-impl"><a class="src rightside" href="../../../src/object_store/layers/mock.rs.html#60">Source</a><a href="#associatedtype.LayeredAccess-10" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.LayeredAccess" class="associatedtype">LayeredAccess</a> = <a class="struct" href="struct.MockAccessor.html" title="struct object_store::layers::mock::MockAccessor">MockAccessor</a><A></h4></section></div></details></div><script src="../../../trait.impl/opendal_core/raw/layer/trait.Layer.js" data-ignore-extern-crates="opendal_core,opendal_layer_concurrent_limit,opendal_layer_logging,opendal_layer_prometheus,opendal_layer_observe_metrics_common,opendal_layer_retry,opendal_layer_timeout,opendal_layer_tracing" async></script></section></div></main></body></html> |