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<li class="navelem"><a class="el" href="namespacegrpc.html">grpc</a></li><li class="navelem"><a class="el" href="classgrpc_1_1_completion_queue.html">CompletionQueue</a></li>  </ul>
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<a href="#pub-types">Public Types</a> &#124;
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<p>A thin wrapper around <a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a> (see src/core/lib/surface/completion_queue.h).  
 <a href="classgrpc_1_1_completion_queue.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="impl_2codegen_2completion__queue_8h_source.html">completion_queue.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a6227657fb2f29291f80cd092f9baf572"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">NextStatus</a> { <a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572a5d05c1c970154dad10e5f648890c215b">SHUTDOWN</a>, 
<a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572a5d8344849fb99341b7edaa9da7b42c08">GOT_EVENT</a>, 
<a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572ae88eecb45f91413b425511ee973e2e04">TIMEOUT</a>
 }</td></tr>
<tr class="memdesc:a6227657fb2f29291f80cd092f9baf572"><td class="mdescLeft">&#160;</td><td class="mdescRight">Tri-state return for AsyncNext: SHUTDOWN, GOT_EVENT, TIMEOUT.  <a href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">More...</a><br/></td></tr>
<tr class="separator:a6227657fb2f29291f80cd092f9baf572"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:aea987a15a475923e949934e481fe3566"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#aea987a15a475923e949934e481fe3566">CompletionQueue</a> ()</td></tr>
<tr class="memdesc:aea987a15a475923e949934e481fe3566"><td class="mdescLeft">&#160;</td><td class="mdescRight">Default constructor.  <a href="#aea987a15a475923e949934e481fe3566">More...</a><br/></td></tr>
<tr class="separator:aea987a15a475923e949934e481fe3566"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a081a954044215a7ca8554da4220fb369"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a081a954044215a7ca8554da4220fb369">CompletionQueue</a> (<a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a> *take)</td></tr>
<tr class="memdesc:a081a954044215a7ca8554da4220fb369"><td class="mdescLeft">&#160;</td><td class="mdescRight">Wrap <em>take</em>, taking ownership of the instance.  <a href="#a081a954044215a7ca8554da4220fb369">More...</a><br/></td></tr>
<tr class="separator:a081a954044215a7ca8554da4220fb369"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aac07e9da5148c779cac51e1bf948c282"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#aac07e9da5148c779cac51e1bf948c282">~CompletionQueue</a> ()</td></tr>
<tr class="memdesc:aac07e9da5148c779cac51e1bf948c282"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destructor. Destroys the owned wrapped completion queue / instance.  <a href="#aac07e9da5148c779cac51e1bf948c282">More...</a><br/></td></tr>
<tr class="separator:aac07e9da5148c779cac51e1bf948c282"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a290ddf3d96e6d1d5886580e60b0602b4"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
<tr class="memitem:a290ddf3d96e6d1d5886580e60b0602b4"><td class="memTemplItemLeft" align="right" valign="top"><a class="el" href="classgrpc_1_1_completion_queue.html#a6227657fb2f29291f80cd092f9baf572">NextStatus</a>&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a290ddf3d96e6d1d5886580e60b0602b4">AsyncNext</a> (void **tag, bool *ok, const T &amp;deadline)</td></tr>
<tr class="memdesc:a290ddf3d96e6d1d5886580e60b0602b4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Read from the queue, blocking up to <em>deadline</em> (or the queue's shutdown).  <a href="#a290ddf3d96e6d1d5886580e60b0602b4">More...</a><br/></td></tr>
<tr class="separator:a290ddf3d96e6d1d5886580e60b0602b4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a86d9810ced694e50f7987ac90b9f8c1a"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a86d9810ced694e50f7987ac90b9f8c1a">Next</a> (void **tag, bool *ok)</td></tr>
<tr class="memdesc:a86d9810ced694e50f7987ac90b9f8c1a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Read from the queue, blocking until an event is available or the queue is shutting down.  <a href="#a86d9810ced694e50f7987ac90b9f8c1a">More...</a><br/></td></tr>
<tr class="separator:a86d9810ced694e50f7987ac90b9f8c1a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a40efddadd9073386fbcb4f46e8325670"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a40efddadd9073386fbcb4f46e8325670">Shutdown</a> ()</td></tr>
<tr class="memdesc:a40efddadd9073386fbcb4f46e8325670"><td class="mdescLeft">&#160;</td><td class="mdescRight">Request the shutdown of the queue.  <a href="#a40efddadd9073386fbcb4f46e8325670">More...</a><br/></td></tr>
<tr class="separator:a40efddadd9073386fbcb4f46e8325670"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a999c317e716d1e74aca2eb050912302b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a999c317e716d1e74aca2eb050912302b">cq</a> ()</td></tr>
<tr class="memdesc:a999c317e716d1e74aca2eb050912302b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns a <em>raw</em> pointer to the underlying <em>grpc_completion_queue</em> instance.  <a href="#a999c317e716d1e74aca2eb050912302b">More...</a><br/></td></tr>
<tr class="separator:a999c317e716d1e74aca2eb050912302b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a169dd094e1347297a168750b4cb592b8"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a169dd094e1347297a168750b4cb592b8">InitialAvalanching</a> ()</td></tr>
<tr class="memdesc:a169dd094e1347297a168750b4cb592b8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Manage state of avalanching operations : completion queue tags that trigger other completion queue operations.  <a href="#a169dd094e1347297a168750b4cb592b8">More...</a><br/></td></tr>
<tr class="separator:a169dd094e1347297a168750b4cb592b8"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a43a587573c1575511cd0df4101e8f065"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a43a587573c1575511cd0df4101e8f065">RegisterAvalanching</a> ()</td></tr>
<tr class="separator:a43a587573c1575511cd0df4101e8f065"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab198302d64bdf815ece389a44fdd931f"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#ab198302d64bdf815ece389a44fdd931f">CompleteAvalanching</a> ()</td></tr>
<tr class="separator:ab198302d64bdf815ece389a44fdd931f"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="friends"></a>
Friends</h2></td></tr>
<tr class="memitem:ade499098cc91745c1c87147d7a7fb7bf"><td class="memTemplParams" colspan="2">template&lt;class R &gt; </td></tr>
<tr class="memitem:ade499098cc91745c1c87147d7a7fb7bf"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#ade499098cc91745c1c87147d7a7fb7bf">::grpc::ClientReader</a></td></tr>
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<tr class="memitem:a4498fada67d531d99a8642f47d746544"><td class="memTemplParams" colspan="2">template&lt;class W &gt; </td></tr>
<tr class="memitem:a4498fada67d531d99a8642f47d746544"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a4498fada67d531d99a8642f47d746544">::grpc::ClientWriter</a></td></tr>
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<tr class="memitem:a6d5659aa24edba057895be774e2752ec"><td class="memTemplParams" colspan="2">template&lt;class W , class R &gt; </td></tr>
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<tr class="memitem:a4f20e2d049342ae00242bbc8021a44bd"><td class="memTemplParams" colspan="2">template&lt;class R &gt; </td></tr>
<tr class="memitem:a4f20e2d049342ae00242bbc8021a44bd"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a4f20e2d049342ae00242bbc8021a44bd">::grpc::ServerReader</a></td></tr>
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<tr class="memitem:a2f2dfa831a62c43ad5647a45080488e3"><td class="memTemplParams" colspan="2">template&lt;class W &gt; </td></tr>
<tr class="memitem:a2f2dfa831a62c43ad5647a45080488e3"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a2f2dfa831a62c43ad5647a45080488e3">::grpc::ServerWriter</a></td></tr>
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<tr class="memitem:a81fd5fb92dd22dced55726c389f3ea29"><td class="memTemplParams" colspan="2">template&lt;class W , class R &gt; </td></tr>
<tr class="memitem:a81fd5fb92dd22dced55726c389f3ea29"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a81fd5fb92dd22dced55726c389f3ea29">::grpc::internal::ServerReaderWriterBody</a></td></tr>
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<tr class="memitem:a76b9bb18b02084e9eaa8c9b99c668676"><td class="memTemplParams" colspan="2">template&lt;class ServiceType , class RequestType , class ResponseType &gt; </td></tr>
<tr class="memitem:a76b9bb18b02084e9eaa8c9b99c668676"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#a76b9bb18b02084e9eaa8c9b99c668676">RpcMethodHandler</a></td></tr>
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<tr class="memitem:ae11583f8aab976055b1feae895d7e12a"><td class="memTemplParams" colspan="2">template&lt;class ServiceType , class RequestType , class ResponseType &gt; </td></tr>
<tr class="memitem:ae11583f8aab976055b1feae895d7e12a"><td class="memTemplItemLeft" align="right" valign="top">class&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classgrpc_1_1_completion_queue.html#ae11583f8aab976055b1feae895d7e12a">ClientStreamingHandler</a></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A thin wrapper around <a class="el" href="grpc__types_8h.html#a895faab0e6035445750e43482651ba2f">grpc_completion_queue</a> (see src/core/lib/surface/completion_queue.h). </p>
<p>See <a class="el" href="md_doc_cpp_perf_notes.html">C++ Performance Notes</a> for notes on best practices for high performance servers. </p>
</div><h2 class="groupheader">Member Enumeration Documentation</h2>
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<p>Tri-state return for AsyncNext: SHUTDOWN, GOT_EVENT, TIMEOUT. </p>
<table class="fieldtable">
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<p>The completion queue has been shutdown. </p>
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<tr><td class="fieldname"><em><a class="anchor" id="a6227657fb2f29291f80cd092f9baf572a5d8344849fb99341b7edaa9da7b42c08"></a>GOT_EVENT</em>&#160;</td><td class="fielddoc">
<p>Got a new event; <em>tag</em> will be filled in with its associated value; <em>ok</em> indicating its success. </p>
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<p>deadline was reached. </p>
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<h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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<p>Default constructor. </p>
<p>Implicitly creates a <em>grpc_completion_queue</em> instance. </p>

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<p>Wrap <em>take</em>, taking ownership of the instance. </p>
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<p>Destructor. Destroys the owned wrapped completion queue / instance. </p>

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<p>Read from the queue, blocking up to <em>deadline</em> (or the queue's shutdown). </p>
<p>Both <em>tag</em> and <em>ok</em> are updated upon success (if an event is available within the <em>deadline</em>). A <em>tag</em> points to an arbitrary location usually employed to uniquely identify an event.</p>
<dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">tag[out]</td><td>Upon sucess, updated to point to the event's tag. </td></tr>
    <tr><td class="paramname">ok[out]</td><td>Upon sucess, true if read a regular event, false otherwise. </td></tr>
    <tr><td class="paramname">deadline[in]</td><td>How long to block in wait for an event.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>The type of event read. </dd></dl>

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<p>Returns a <em>raw</em> pointer to the underlying <em>grpc_completion_queue</em> instance. </p>
<dl class="section warning"><dt>Warning</dt><dd>Remember that the returned instance is owned. No transfer of owership is performed. </dd></dl>

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<p>Manage state of avalanching operations : completion queue tags that trigger other completion queue operations. </p>
<p>The underlying core completion queue should not really shutdown until all avalanching operations have been finalized. Note that we maintain the requirement that an avalanche registration must take place before CQ shutdown (which must be maintained elsehwere) </p>

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<p>Read from the queue, blocking until an event is available or the queue is shutting down. </p>
<dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">tag[out]</td><td>Updated to point to the read event's tag. </td></tr>
    <tr><td class="paramname">ok[out]</td><td>true if read a regular event, false otherwise.</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>true if read a regular event, false if the queue is shutting down. </dd></dl>

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<p>Request the shutdown of the queue. </p>
<dl class="section warning"><dt>Warning</dt><dd>This method must be called at some point if this completion queue is accessed with Next or AsyncNext. Once invoked, <em>Next</em> will start to return false and <em>AsyncNext</em> will return <em>NextStatus::SHUTDOWN</em>. Only once either one of these methods does that (that is, once the queue has been <em>drained</em>) can an instance of this class be destroyed. </dd></dl>

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<h2 class="groupheader">Friends And Related Function Documentation</h2>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/grpc++/impl/codegen/<a class="el" href="impl_2codegen_2completion__queue_8h_source.html">completion_queue.h</a></li>
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