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<p><code>#include &lt;<a class="el" href="promise_8h_source.html">promise.h</a>&gt;</code></p>
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Collaboration diagram for impala::Promise&lt; T &gt;:</div>
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Public Member Functions</h2></td></tr>
<tr class="memitem:a51923bc0ef48a2ba0112cb5d626bc750"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#a51923bc0ef48a2ba0112cb5d626bc750">Promise</a> ()</td></tr>
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<tr class="memitem:abf8dc89791be540e5914372b06eee286"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#abf8dc89791be540e5914372b06eee286">Set</a> (const T &amp;val)</td></tr>
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<tr class="memitem:a8f2164acd412822ae61ee0b93825ce5e"><td class="memItemLeft" align="right" valign="top">const T &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#a8f2164acd412822ae61ee0b93825ce5e">Get</a> ()</td></tr>
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<tr class="memitem:ab1beb775a01496486c9f9e7e097f6893"><td class="memItemLeft" align="right" valign="top">const T &amp;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#ab1beb775a01496486c9f9e7e097f6893">Get</a> (int64_t timeout_millis, <a class="el" href="classbool.html">bool</a> *timed_out)</td></tr>
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<tr class="memitem:a37e41565c6813bcea306266111464daa"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classbool.html">bool</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#a37e41565c6813bcea306266111464daa">IsSet</a> ()</td></tr>
<tr class="memdesc:a37e41565c6813bcea306266111464daa"><td class="mdescLeft">&#160;</td><td class="mdescRight">Returns whether the value is set. <a href="#a37e41565c6813bcea306266111464daa">More...</a><br/></td></tr>
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Private Attributes</h2></td></tr>
<tr class="memitem:a00a898260b39cea6812771e867574079"><td class="memItemLeft" align="right" valign="top">boost::condition_variable&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#a00a898260b39cea6812771e867574079">val_set_cond_</a></td></tr>
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<tr class="memitem:a1962e1536723c8b1c0a0c8189967ffa8"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classbool.html">bool</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#a1962e1536723c8b1c0a0c8189967ffa8">val_is_set_</a></td></tr>
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<tr class="memitem:a09c670e4f8cabc4e4797e3688a32ccb2"><td class="memItemLeft" align="right" valign="top">boost::mutex&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#a09c670e4f8cabc4e4797e3688a32ccb2">val_lock_</a></td></tr>
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<tr class="memitem:acd2041e72b4314f09d46728c04c3455e"><td class="memItemLeft" align="right" valign="top">T&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classimpala_1_1Promise.html#acd2041e72b4314f09d46728c04c3455e">val_</a></td></tr>
<tr class="memdesc:acd2041e72b4314f09d46728c04c3455e"><td class="mdescLeft">&#160;</td><td class="mdescRight">The actual value transferred from producer to consumer. <a href="#acd2041e72b4314f09d46728c04c3455e">More...</a><br/></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename T&gt;<br/>
class impala::Promise&lt; T &gt;</h3>
<p>A stripped-down replacement for boost::promise which, to the best of our knowledge, actually works. A single producer provides a single value by calling Set(..), which one or more consumers retrieve through calling Get(..). Consumers must be consistent in their use of <a class="el" href="classimpala_1_1Promise.html#a8f2164acd412822ae61ee0b93825ce5e">Get()</a>, i.e., for a particular promise all consumers should either have a timeout or not. </p>
<p>Definition at line <a class="el" href="promise_8h_source.html#l00032">32</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
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<p>Definition at line <a class="el" href="promise_8h_source.html#l00034">34</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
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<p>Blocks until a value is set, and then returns a reference to that value. Once <a class="el" href="classimpala_1_1Promise.html#a8f2164acd412822ae61ee0b93825ce5e">Get()</a> returns, the returned value will not change, since Set(..) may not be called twice. </p>
<p>Definition at line <a class="el" href="promise_8h_source.html#l00059">59</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
<p>Referenced by <a class="el" href="admission-controller_8cc_source.html#l00265">impala::AdmissionController::AdmitQuery()</a>, <a class="el" href="hdfs-bulk-ops_8cc_source.html#l00129">impala::HdfsOperationSet::Execute()</a>, <a class="el" href="blocking-join-node_8cc_source.html#l00156">impala::BlockingJoinNode::Open()</a>, <a class="el" href="thrift-thread_8cc_source.html#l00027">impala::ThriftThread::start()</a>, <a class="el" href="thread_8cc_source.html#l00270">impala::Thread::StartThread()</a>, <a class="el" href="promise-test_8cc_source.html#l00048">impala::TEST()</a>, and <a class="el" href="resource-broker_8cc_source.html#l00472">impala::ResourceBroker::WaitForNotification()</a>.</p>
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<p>Blocks until a value is set or the given timeout was reached. Returns a reference to that value which is invalid if the timeout was reached. Once <a class="el" href="classimpala_1_1Promise.html#a8f2164acd412822ae61ee0b93825ce5e">Get()</a> returns and *timed_out is false, the returned value will not change, since Set(..) may not be called twice. timeout_millis: The max wall-clock time in milliseconds to wait (must be &gt; 0). timed_out: Indicates whether <a class="el" href="classimpala_1_1Promise.html#a8f2164acd412822ae61ee0b93825ce5e">Get()</a> returned due to timeout. Must be non-NULL. </p>
<p>Definition at line <a class="el" href="promise_8h_source.html#l00073">73</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
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<p>Returns whether the value is set. </p>
<p>Definition at line <a class="el" href="promise_8h_source.html#l00092">92</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
<p>Referenced by <a class="el" href="admission-controller_8cc_source.html#l00265">impala::AdmissionController::AdmitQuery()</a>, and <a class="el" href="admission-controller_8cc_source.html#l00595">impala::AdmissionController::DequeueLoop()</a>.</p>
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<p>Copies val into this promise, and notifies any consumers blocked in <a class="el" href="classimpala_1_1Promise.html#a8f2164acd412822ae61ee0b93825ce5e">Get()</a>. It is invalid to call <a class="el" href="classimpala_1_1Promise.html#abf8dc89791be540e5914372b06eee286">Set()</a> twice. </p>
<p>Note: this must be called with 'val_lock_' taken. There are places where we use this object with this pattern: { <a class="el" href="classimpala_1_1Promise.html">Promise</a> p; ... p.get(); } &lt; promise object gets destroyed &gt; Calling notify_all() with the val_lock_ guarantees that the thread calling <a class="el" href="classimpala_1_1Promise.html#abf8dc89791be540e5914372b06eee286">Set()</a> is done and the promise is safe to delete. </p>
<p>Definition at line <a class="el" href="promise_8h_source.html#l00038">38</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
<p>Referenced by <a class="el" href="admission-controller_8cc_source.html#l00265">impala::AdmissionController::AdmitQuery()</a>, <a class="el" href="blocking-join-node_8cc_source.html#l00136">impala::BlockingJoinNode::BuildSideThread()</a>, <a class="el" href="admission-controller_8cc_source.html#l00595">impala::AdmissionController::DequeueLoop()</a>, <a class="el" href="buffered-block-mgr-test_8cc_source.html#l00074">impala::BufferedBlockMgrTest::GetFreeBlock()</a>, <a class="el" href="hdfs-bulk-ops_8cc_source.html#l00162">impala::HdfsOperationSet::MarkOneOpDone()</a>, <a class="el" href="authentication_8cc_source.html#l00440">impala::SaslAuthProvider::RunKinit()</a>, <a class="el" href="thrift-thread_8cc_source.html#l00054">impala::ThriftThread::RunRunnable()</a>, <a class="el" href="promise-test_8cc_source.html#l00044">impala::RunThread()</a>, <a class="el" href="thread_8cc_source.html#l00288">impala::Thread::SuperviseThread()</a>, and <a class="el" href="promise-test_8cc_source.html#l00074">impala::TEST()</a>.</p>
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<h2 class="groupheader">Member Data Documentation</h2>
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<p>The actual value transferred from producer to consumer. </p>
<p>Definition at line <a class="el" href="promise_8h_source.html#l00105">105</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
<p>Referenced by <a class="el" href="promise_8h_source.html#l00059">impala::Promise&lt; bool &gt;::Get()</a>, and <a class="el" href="promise_8h_source.html#l00038">impala::Promise&lt; bool &gt;::Set()</a>.</p>
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<p>Definition at line <a class="el" href="promise_8h_source.html#l00101">101</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
<p>Referenced by <a class="el" href="promise_8h_source.html#l00059">impala::Promise&lt; bool &gt;::Get()</a>, <a class="el" href="promise_8h_source.html#l00092">impala::Promise&lt; bool &gt;::IsSet()</a>, and <a class="el" href="promise_8h_source.html#l00038">impala::Promise&lt; bool &gt;::Set()</a>.</p>
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<td class="memname">boost::mutex <a class="el" href="classimpala_1_1Promise.html">impala::Promise</a>&lt; T &gt;::val_lock_</td>
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<p>Definition at line <a class="el" href="promise_8h_source.html#l00102">102</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
<p>Referenced by <a class="el" href="promise_8h_source.html#l00059">impala::Promise&lt; bool &gt;::Get()</a>, <a class="el" href="promise_8h_source.html#l00092">impala::Promise&lt; bool &gt;::IsSet()</a>, and <a class="el" href="promise_8h_source.html#l00038">impala::Promise&lt; bool &gt;::Set()</a>.</p>
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<p>These variables deal with coordination between consumer and producer, and protect access to val_; </p>
<p>Definition at line <a class="el" href="promise_8h_source.html#l00100">100</a> of file <a class="el" href="promise_8h_source.html">promise.h</a>.</p>
<p>Referenced by <a class="el" href="promise_8h_source.html#l00059">impala::Promise&lt; bool &gt;::Get()</a>, and <a class="el" href="promise_8h_source.html#l00038">impala::Promise&lt; bool &gt;::Set()</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>be/src/util/<a class="el" href="promise_8h_source.html">promise.h</a></li>
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