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164 lines
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<meta name="description" content="API documentation for the Rust `Executor` trait in crate `futures`.">
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<div class="sidebar-menu">☰</div>
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<p class='location'>Trait Executor</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.execute">execute</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>futures</a>::<wbr><a href='index.html'>future</a></p><script>window.sidebarCurrent = {name: 'Executor', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>futures</a>::<wbr><a href='index.html'>future</a>::<wbr><a class="trait" href=''>Executor</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/futures/future/mod.rs.html#1094-1116' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Executor<F: <a class="trait" href="../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Error = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>>> {
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fn <a href='#tymethod.execute' class='fnname'>execute</a>(&self, future: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../../futures/future/struct.ExecuteError.html" title="struct futures::future::ExecuteError">ExecuteError</a><F>>;
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}</pre><div class='docblock'><p>A trait for types which can spawn fresh futures.</p>
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<p>This trait is typically implemented for "executors", or those types which
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can execute futures to completion. Futures passed to <code>Spawn::spawn</code>
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typically get turned into a <em>task</em> and are then driven to completion.</p>
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<p>On spawn, the executor takes ownership of the future and becomes responsible
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to call <code>Future::poll()</code> whenever a readiness notification is raised.</p>
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</div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.execute' class='method'><span id='execute.v' class='invisible'><code>fn <a href='#tymethod.execute' class='fnname'>execute</a>(&self, future: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="../../futures/future/struct.ExecuteError.html" title="struct futures::future::ExecuteError">ExecuteError</a><F>></code></span></h3><div class='docblock'><p>Spawns a future to run on this <code>Executor</code>, typically in the
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"background".</p>
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<p>This function will return immediately, and schedule the future <code>future</code>
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to run on <code>self</code>. The details of scheduling and execution are left to
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the implementations of <code>Executor</code>, but this is typically a primary point
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for injecting concurrency in a futures-based system. Futures spawned
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through this <code>execute</code> function tend to run concurrently while they're
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waiting on events.</p>
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<h1 id="errors" class="section-header"><a href="#errors">Errors</a></h1>
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<p>Implementers of this trait are allowed to reject accepting this future
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as well. This can happen for various reason such as:</p>
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<ul>
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<li>The executor is shut down</li>
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<li>The executor has run out of capacity to execute futures</li>
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</ul>
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<p>The decision is left to the caller how to work with this form of error.
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The error returned transfers ownership of the future back to the caller.</p>
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</div></div>
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<h2 id='implementors' class='small-section-header'>
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Implementors<a href='#implementors' class='anchor'></a>
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</h2>
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