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<div class="subTitle">org.apache.solr.hadoop</div>
<h2 title="Class HeartBeater" class="title">Class HeartBeater</h2>
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<li>org.apache.solr.hadoop.HeartBeater</li>
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<pre>public class <span class="strong">HeartBeater</span>
extends <a href="http://download.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a></pre>
<div class="block">This class runs a background thread that once every 60 seconds checks to see if
a progress report is needed. If a report is needed it is issued.
A simple counter <a href="../../../../org/apache/solr/hadoop/HeartBeater.html#threadsNeedingHeartBeat"><code>threadsNeedingHeartBeat</code></a> handles the number of
threads requesting a heart beat.
The expected usage pattern is
<pre>
try {
heartBeater.needHeartBeat();
do something that may take a while
} finally {
heartBeater.cancelHeartBeat();
}
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<td class="colFirst"><code>static org.slf4j.Logger</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#LOG">LOG</a></strong></code> </td>
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<td class="colOne"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#HeartBeater(org.apache.hadoop.util.Progressable)">HeartBeater</a></strong>(org.apache.hadoop.util.Progressable progress)</code>
<div class="block">Create the heart beat object thread set it to daemon priority and start the
thread.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#cancelHeartBeat()">cancelHeartBeat</a></strong>()</code>
<div class="block">inform the background thread that this heartbeat request is not needed.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#close()">close</a></strong>()</code>
<div class="block">Releases any resources</div>
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<td class="colFirst"><code>org.apache.hadoop.util.Progressable</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#getProgress()">getProgress</a></strong>()</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#needHeartBeat()">needHeartBeat</a></strong>()</code>
<div class="block">inform the background thread that heartbeats are to be issued.</div>
</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#run()">run</a></strong>()</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#setProgress(org.apache.hadoop.util.Progressable)">setProgress</a></strong>(org.apache.hadoop.util.Progressable progress)</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/solr/hadoop/HeartBeater.html#setStatus(java.lang.String)">setStatus</a></strong>(<a href="http://download.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> status)</code> </td>
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<h4>LOG</h4>
<pre>public static org.slf4j.Logger LOG</pre>
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<h4>HeartBeater</h4>
<pre>public HeartBeater(org.apache.hadoop.util.Progressable progress)</pre>
<div class="block">Create the heart beat object thread set it to daemon priority and start the
thread. When the count in <a href="../../../../org/apache/solr/hadoop/HeartBeater.html#threadsNeedingHeartBeat"><code>threadsNeedingHeartBeat</code></a> is positive, the
heart beat will be issued on the progress object every 60 seconds.</div>
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<h4>getProgress</h4>
<pre>public org.apache.hadoop.util.Progressable getProgress()</pre>
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<h4>setProgress</h4>
<pre>public void setProgress(org.apache.hadoop.util.Progressable progress)</pre>
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<h4>run</h4>
<pre>public void run()</pre>
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<dt><strong>Specified by:</strong></dt>
<dd><code><a href="http://download.oracle.com/javase/7/docs/api/java/lang/Runnable.html?is-external=true#run()" title="class or interface in java.lang">run</a></code> in interface <code><a href="http://download.oracle.com/javase/7/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="http://download.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true#run()" title="class or interface in java.lang">run</a></code> in class <code><a href="http://download.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a></code></dd>
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<h4>needHeartBeat</h4>
<pre>public void needHeartBeat()</pre>
<div class="block">inform the background thread that heartbeats are to be issued. Issue a
heart beat also</div>
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<a name="cancelHeartBeat()">
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<h4>cancelHeartBeat</h4>
<pre>public void cancelHeartBeat()</pre>
<div class="block">inform the background thread that this heartbeat request is not needed.
This must be called at some point after each <a href="../../../../org/apache/solr/hadoop/HeartBeater.html#needHeartBeat()"><code>needHeartBeat()</code></a>
request.</div>
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<h4>setStatus</h4>
<pre>public void setStatus(<a href="http://download.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> status)</pre>
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