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</pre><pre class="rust"><code><span class="kw">use </span>std::sync::Arc;
<span class="kw">use </span><span class="kw">super</span>::ConcurrencyLimit;
<span class="kw">use </span>tokio::sync::Semaphore;
<span class="kw">use </span>tower_layer::Layer;
<span class="doccomment">/// Enforces a limit on the concurrent number of requests the underlying
/// service can handle.
</span><span class="attribute">#[derive(Debug, Clone)]
</span><span class="kw">pub struct </span>ConcurrencyLimitLayer {
max: usize,
}
<span class="kw">impl </span>ConcurrencyLimitLayer {
<span class="doccomment">/// Create a new concurrency limit layer.
</span><span class="kw">pub fn </span>new(max: usize) -&gt; <span class="self">Self </span>{
ConcurrencyLimitLayer { max }
}
}
<span class="kw">impl</span>&lt;S&gt; Layer&lt;S&gt; <span class="kw">for </span>ConcurrencyLimitLayer {
<span class="kw">type </span>Service = ConcurrencyLimit&lt;S&gt;;
<span class="kw">fn </span>layer(<span class="kw-2">&amp;</span><span class="self">self</span>, service: S) -&gt; <span class="self">Self</span>::Service {
ConcurrencyLimit::new(service, <span class="self">self</span>.max)
}
}
<span class="doccomment">/// Enforces a limit on the concurrent number of requests the underlying
/// service can handle.
///
/// Unlike [`ConcurrencyLimitLayer`], which enforces a per-service concurrency
/// limit, this layer accepts a owned semaphore (`Arc&lt;Semaphore&gt;`) which can be
/// shared across multiple services.
///
/// Cloning this layer will not create a new semaphore.
</span><span class="attribute">#[derive(Debug, Clone)]
</span><span class="kw">pub struct </span>GlobalConcurrencyLimitLayer {
semaphore: Arc&lt;Semaphore&gt;,
}
<span class="kw">impl </span>GlobalConcurrencyLimitLayer {
<span class="doccomment">/// Create a new `GlobalConcurrencyLimitLayer`.
</span><span class="kw">pub fn </span>new(max: usize) -&gt; <span class="self">Self </span>{
<span class="self">Self</span>::with_semaphore(Arc::new(Semaphore::new(max)))
}
<span class="doccomment">/// Create a new `GlobalConcurrencyLimitLayer` from a `Arc&lt;Semaphore&gt;`
</span><span class="kw">pub fn </span>with_semaphore(semaphore: Arc&lt;Semaphore&gt;) -&gt; <span class="self">Self </span>{
GlobalConcurrencyLimitLayer { semaphore }
}
}
<span class="kw">impl</span>&lt;S&gt; Layer&lt;S&gt; <span class="kw">for </span>GlobalConcurrencyLimitLayer {
<span class="kw">type </span>Service = ConcurrencyLimit&lt;S&gt;;
<span class="kw">fn </span>layer(<span class="kw-2">&amp;</span><span class="self">self</span>, service: S) -&gt; <span class="self">Self</span>::Service {
ConcurrencyLimit::with_semaphore(service, <span class="self">self</span>.semaphore.clone())
}
}
</code></pre></div>
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