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<div class="sidebar-menu">☰</div>
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<p class='location'>Trait Service</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Request">Request</a><a href="#associatedtype.Response">Response</a><a href="#associatedtype.Error">Error</a><a href="#associatedtype.Future">Future</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.call">call</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-Service">Box<S></a><a href="#impl-Service">Rc<S></a><a href="#impl-Service">Arc<S></a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='index.html'>tokio_service</a></p><script>window.sidebarCurrent = {name: 'Service', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Trait <a href='index.html'>tokio_service</a>::<wbr><a class="trait" href=''>Service</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/tokio_service/lib.rs.html#140-156' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Service {
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type <a href='#associatedtype.Request' class="type">Request</a>;
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type <a href='#associatedtype.Response' class="type">Response</a>;
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type <a href='#associatedtype.Error' class="type">Error</a>;
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type <a href='#associatedtype.Future' class="type">Future</a>: <a class="trait" href="../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = Self::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Response" title="type tokio_service::Service::Response">Response</a>, Error = Self::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Error" title="type tokio_service::Service::Error">Error</a>>;
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fn <a href='#tymethod.call' class='fnname'>call</a>(&self, req: Self::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Request" title="type tokio_service::Service::Request">Request</a>) -> Self::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Future" title="type tokio_service::Service::Future">Future</a>;
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}</pre><div class='docblock'><p>An asynchronous function from <code>Request</code> to a <code>Response</code>.</p>
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<p>The <code>Service</code> trait is a simplified interface making it easy to write
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network applications in a modular and reusable way, decoupled from the
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underlying protocol. It is one of Tokio's fundamental abstractions.</p>
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<h1 id="functional" class="section-header"><a href="#functional">Functional</a></h1>
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<p>A <code>Service</code> is a function from a <code>Request</code>. It immediately returns a
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<code>Future</code> representing the eventual completion of processing the
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request. The actual request processing may happen at any time in the
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future, on any thread or executor. The processing may depend on calling
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other services. At some point in the future, the processing will complete,
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and the <code>Future</code> will resolve to a response or error.</p>
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<p>At a high level, the <code>Service::call</code> represents an RPC request. The
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<code>Service</code> value can be a server or a client.</p>
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<h1 id="server" class="section-header"><a href="#server">Server</a></h1>
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<p>An RPC server <em>implements</em> the <code>Service</code> trait. Requests received by the
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server over the network are deserialized then passed as an argument to the
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server value. The returned response is sent back over the network.</p>
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<p>As an example, here is how an HTTP request is processed by a server:</p>
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<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
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<span class="kw">impl</span> <span class="ident">Service</span> <span class="kw">for</span> <span class="ident">HelloWorld</span> {
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<span class="kw">type</span> <span class="ident">Request</span> <span class="op">=</span> <span class="ident">http</span>::<span class="ident">Request</span>;
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<span class="kw">type</span> <span class="ident">Response</span> <span class="op">=</span> <span class="ident">http</span>::<span class="ident">Response</span>;
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<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">http</span>::<span class="ident">Error</span>;
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<span class="kw">type</span> <span class="ident">Future</span> <span class="op">=</span> <span class="ident">Box</span><span class="op"><</span><span class="ident">Future</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">Response</span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">http</span>::<span class="ident">Error</span><span class="op">>></span>;
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<span class="kw">fn</span> <span class="ident">call</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">req</span>: <span class="ident">http</span>::<span class="ident">Request</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Future</span> {
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<span class="comment">// Create the HTTP response</span>
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<span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="ident">http</span>::<span class="ident">Response</span>::<span class="ident">ok</span>()
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.<span class="ident">with_body</span>(<span class="string">b"hello world\n"</span>);
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<span class="comment">// Return the response as an immediate future</span>
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<span class="ident">futures</span>::<span class="ident">finished</span>(<span class="ident">resp</span>).<span class="ident">boxed</span>()
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}
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}</pre>
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<h1 id="client" class="section-header"><a href="#client">Client</a></h1>
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<p>A client consumes a service by using a <code>Service</code> value. The client may
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issue requests by invoking <code>call</code> and passing the request as an argument.
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It then receives the response by waiting for the returned future.</p>
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<p>As an example, here is how a Redis request would be issued:</p>
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<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
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<span class="kw">let</span> <span class="ident">client</span> <span class="op">=</span> <span class="ident">redis</span>::<span class="ident">Client</span>::<span class="ident">new</span>()
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.<span class="ident">connect</span>(<span class="string">"127.0.0.1:6379"</span>.<span class="ident">parse</span>().<span class="ident">unwrap</span>())
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.<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">resp</span> <span class="op">=</span> <span class="ident">client</span>.<span class="ident">call</span>(<span class="ident">Cmd</span>::<span class="ident">set</span>(<span class="string">"foo"</span>, <span class="string">"this is the value of foo"</span>));
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<span class="comment">// Wait for the future to resolve</span>
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Redis response: {:?}"</span>, <span class="ident">await</span>(<span class="ident">resp</span>));</pre>
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<h1 id="middleware" class="section-header"><a href="#middleware">Middleware</a></h1>
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<p>More often than not, all the pieces needed for writing robust, scalable
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network applications are the same no matter the underlying protocol. By
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unifying the API for both clients and servers in a protocol agnostic way,
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it is possible to write middleware that provide these pieces in a
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reusable way.</p>
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<p>For example, take timeouts as an example:</p>
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<div class='information'><div class='tooltip ignore'>ⓘ<span class='tooltiptext'>This example is not tested</span></div></div><pre class="rust rust-example-rendered ignore">
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">Service</span>;
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<span class="kw">use</span> <span class="ident">futures</span>::<span class="ident">Future</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
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<span class="comment">// Not yet implemented, but soon :)</span>
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">timer</span>::{<span class="ident">Timer</span>, <span class="ident">Expired</span>};
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Timeout</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
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<span class="ident">upstream</span>: <span class="ident">T</span>,
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<span class="ident">delay</span>: <span class="ident">Duration</span>,
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<span class="ident">timer</span>: <span class="ident">Timer</span>,
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}
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<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Timeout</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">upstream</span>: <span class="ident">T</span>, <span class="ident">delay</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="ident">Timeout</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
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<span class="ident">Timeout</span> {
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<span class="ident">upstream</span>: <span class="ident">upstream</span>,
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<span class="ident">delay</span>: <span class="ident">delay</span>,
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<span class="ident">timer</span>: <span class="ident">Timer</span>::<span class="ident">default</span>(),
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}
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}
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}
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<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Service</span> <span class="kw">for</span> <span class="ident">Timeout</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
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<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Service</span>,
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<span class="ident">T</span>::<span class="ident">Error</span>: <span class="ident">From</span><span class="op"><</span><span class="ident">Expired</span><span class="op">></span>,
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{
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<span class="kw">type</span> <span class="ident">Request</span> <span class="op">=</span> <span class="ident">T</span>::<span class="ident">Request</span>;
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<span class="kw">type</span> <span class="ident">Response</span> <span class="op">=</span> <span class="ident">T</span>::<span class="ident">Response</span>;
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<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">T</span>::<span class="ident">Error</span>;
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<span class="kw">type</span> <span class="ident">Future</span> <span class="op">=</span> <span class="ident">Box</span><span class="op"><</span><span class="ident">Future</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">Response</span>, <span class="ident">Error</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">Error</span><span class="op">>></span>;
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<span class="kw">fn</span> <span class="ident">call</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">req</span>: <span class="self">Self</span>::<span class="ident">Req</span>) <span class="op">-></span> <span class="self">Self</span>::<span class="ident">Future</span> {
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<span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">timer</span>.<span class="ident">timeout</span>(<span class="self">self</span>.<span class="ident">delay</span>)
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.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">timeout</span><span class="op">|</span> <span class="prelude-val">Err</span>(<span class="self">Self</span>::<span class="ident">Error</span>::<span class="ident">from</span>(<span class="ident">timeout</span>)));
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<span class="self">self</span>.<span class="ident">upstream</span>.<span class="ident">call</span>(<span class="ident">req</span>)
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.<span class="ident">select</span>(<span class="ident">timeout</span>)
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.<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">v</span>, _)<span class="op">|</span> <span class="ident">v</span>)
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.<span class="ident">map_err</span>(<span class="op">|</span>(<span class="ident">e</span>, _)<span class="op">|</span> <span class="ident">e</span>)
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.<span class="ident">boxed</span>()
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}
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}
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</pre>
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<p>The above timeout implementation is decoupled from the underlying protocol
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and is also decoupled from client or server concerns. In other words, the
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same timeout middleware could be used in either a client or a server.</p>
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</div>
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<h2 id='associated-types' class='small-section-header'>
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Associated Types<a href='#associated-types' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='associatedtype.Request' class='method'><span id='Request.t' class='invisible'><code>type <a href='#associatedtype.Request' class="type">Request</a></code></span></h3><div class='docblock'><p>Requests handled by the service.</p>
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</div><h3 id='associatedtype.Response' class='method'><span id='Response.t' class='invisible'><code>type <a href='#associatedtype.Response' class="type">Response</a></code></span></h3><div class='docblock'><p>Responses given by the service.</p>
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</div><h3 id='associatedtype.Error' class='method'><span id='Error.t' class='invisible'><code>type <a href='#associatedtype.Error' class="type">Error</a></code></span></h3><div class='docblock'><p>Errors produced by the service.</p>
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</div><h3 id='associatedtype.Future' class='method'><span id='Future.t' class='invisible'><code>type <a href='#associatedtype.Future' class="type">Future</a>: <a class="trait" href="../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = Self::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Response" title="type tokio_service::Service::Response">Response</a>, Error = Self::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Error" title="type tokio_service::Service::Error">Error</a>></code></span></h3><div class='docblock'><p>The future response value.</p>
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</div></div>
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<h2 id='required-methods' class='small-section-header'>
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|||
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Required Methods<a href='#required-methods' class='anchor'></a>
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|||
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</h2>
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|||
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<div class='methods'>
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<h3 id='tymethod.call' class='method'><span id='call.v' class='invisible'><code>fn <a href='#tymethod.call' class='fnname'>call</a>(&self, req: Self::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Request" title="type tokio_service::Service::Request">Request</a>) -> Self::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Future" title="type tokio_service::Service::Future">Future</a></code></span></h3><div class='docblock'><p>Process the request and return the response asynchronously.</p>
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</div></div>
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<h2 id='foreign-impls' class='small-section-header'>
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|||
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Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
|
|||
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</h2>
|
|||
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<h3 id='impl-Service' class='impl'><span class='in-band'><code>impl<S: <a class="trait" href="../tokio_service/trait.Service.html" title="trait tokio_service::Service">Service</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="../tokio_service/trait.Service.html" title="trait tokio_service::Service">Service</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><S></code><a href='#impl-Service' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_service/lib.rs.html#212-221' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='associatedtype.Request-1' class="type"><span id='Request.t-1' class='invisible'><code>type <a href='#associatedtype.Request' class="type">Request</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Request" title="type tokio_service::Service::Request">Request</a></code></span></h4>
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<h4 id='associatedtype.Response-1' class="type"><span id='Response.t-1' class='invisible'><code>type <a href='#associatedtype.Response' class="type">Response</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Response" title="type tokio_service::Service::Response">Response</a></code></span></h4>
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<h4 id='associatedtype.Error-1' class="type"><span id='Error.t-1' class='invisible'><code>type <a href='#associatedtype.Error' class="type">Error</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Error" title="type tokio_service::Service::Error">Error</a></code></span></h4>
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<h4 id='associatedtype.Future-1' class="type"><span id='Future.t-1' class='invisible'><code>type <a href='#associatedtype.Future' class="type">Future</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Future" title="type tokio_service::Service::Future">Future</a></code></span></h4>
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<h4 id='method.call' class="method"><span id='call.v-1' class='invisible'><code>fn <a href='#method.call' class='fnname'>call</a>(&self, request: S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Request" title="type tokio_service::Service::Request">Request</a>) -> S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Future" title="type tokio_service::Service::Future">Future</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_service/lib.rs.html#218-220' title='goto source code'>[src]</a></span></h4>
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</div></span><h3 id='impl-Service-1' class='impl'><span class='in-band'><code>impl<S: <a class="trait" href="../tokio_service/trait.Service.html" title="trait tokio_service::Service">Service</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="../tokio_service/trait.Service.html" title="trait tokio_service::Service">Service</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html" title="struct alloc::rc::Rc">Rc</a><S></code><a href='#impl-Service-1' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_service/lib.rs.html#223-232' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='associatedtype.Request-2' class="type"><span id='Request.t-2' class='invisible'><code>type <a href='#associatedtype.Request' class="type">Request</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Request" title="type tokio_service::Service::Request">Request</a></code></span></h4>
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<h4 id='associatedtype.Response-2' class="type"><span id='Response.t-2' class='invisible'><code>type <a href='#associatedtype.Response' class="type">Response</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Response" title="type tokio_service::Service::Response">Response</a></code></span></h4>
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<h4 id='associatedtype.Error-2' class="type"><span id='Error.t-2' class='invisible'><code>type <a href='#associatedtype.Error' class="type">Error</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Error" title="type tokio_service::Service::Error">Error</a></code></span></h4>
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<h4 id='associatedtype.Future-2' class="type"><span id='Future.t-2' class='invisible'><code>type <a href='#associatedtype.Future' class="type">Future</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Future" title="type tokio_service::Service::Future">Future</a></code></span></h4>
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<h4 id='method.call-1' class="method"><span id='call.v-2' class='invisible'><code>fn <a href='#method.call' class='fnname'>call</a>(&self, request: S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Request" title="type tokio_service::Service::Request">Request</a>) -> S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Future" title="type tokio_service::Service::Future">Future</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_service/lib.rs.html#229-231' title='goto source code'>[src]</a></span></h4>
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</div></span><h3 id='impl-Service-2' class='impl'><span class='in-band'><code>impl<S: <a class="trait" href="../tokio_service/trait.Service.html" title="trait tokio_service::Service">Service</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="../tokio_service/trait.Service.html" title="trait tokio_service::Service">Service</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html" title="struct alloc::arc::Arc">Arc</a><S></code><a href='#impl-Service-2' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_service/lib.rs.html#234-243' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='associatedtype.Request-3' class="type"><span id='Request.t-3' class='invisible'><code>type <a href='#associatedtype.Request' class="type">Request</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Request" title="type tokio_service::Service::Request">Request</a></code></span></h4>
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<h4 id='associatedtype.Response-3' class="type"><span id='Response.t-3' class='invisible'><code>type <a href='#associatedtype.Response' class="type">Response</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Response" title="type tokio_service::Service::Response">Response</a></code></span></h4>
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<h4 id='associatedtype.Error-3' class="type"><span id='Error.t-3' class='invisible'><code>type <a href='#associatedtype.Error' class="type">Error</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Error" title="type tokio_service::Service::Error">Error</a></code></span></h4>
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<h4 id='associatedtype.Future-3' class="type"><span id='Future.t-3' class='invisible'><code>type <a href='#associatedtype.Future' class="type">Future</a> = S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Future" title="type tokio_service::Service::Future">Future</a></code></span></h4>
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<h4 id='method.call-2' class="method"><span id='call.v-3' class='invisible'><code>fn <a href='#method.call' class='fnname'>call</a>(&self, request: S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Request" title="type tokio_service::Service::Request">Request</a>) -> S::<a class="type" href="../tokio_service/trait.Service.html#associatedtype.Future" title="type tokio_service::Service::Future">Future</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/tokio_service/lib.rs.html#240-242' title='goto source code'>[src]</a></span></h4>
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