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<div class="subTitle">org.apache.ignite</div>
<h2 title="Interface IgniteCountDownLatch" class="title">Interface IgniteCountDownLatch</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></dd>
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<pre>public interface <span class="typeNameLabel">IgniteCountDownLatch</span>
extends <a href="http://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre>
<div class="block">This interface provides a rich API for working with distributed count down latch.
<p>
<h1 class="header">Functionality</h1>
Distributed count down latch provides functionality similar to <code>java.util.CountDownLatch</code>.
Note that you cannot remove count down latch having count greater that zero. It should be
counted down to zero first.
<h1 class="header">Creating Distributed Count Down Latch</h1>
Instance of cache count down latch can be created by calling the following method:
<a href="../../../org/apache/ignite/Ignite.html#countDownLatch-java.lang.String-int-boolean-boolean-"><code>Ignite.countDownLatch(String, int, boolean, boolean)</code></a>.</div>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#autoDelete--">autoDelete</a></span>()</code>
<div class="block">Gets <code>autoDelete</code> flag.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#await--">await</a></span>()</code>
<div class="block">Causes the current thread to wait until the latch has counted down to
zero, unless current thread is interrupted.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#await-long-">await</a></span>(long&nbsp;timeout)</code>
<div class="block">Causes the current thread to wait until the latch has counted down to
zero, unless the thread is interrupted, or the specified waiting time elapses.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#await-long-java.util.concurrent.TimeUnit-">await</a></span>(long&nbsp;timeout,
<a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a>&nbsp;unit)</code>
<div class="block">Causes the current thread to wait until the latch has counted down to
zero, unless the thread is interrupted, or the specified waiting time elapses.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#close--">close</a></span>()</code>
<div class="block">Removes this count down latch.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#count--">count</a></span>()</code>
<div class="block">Gets current count value of the latch.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#countDown--">countDown</a></span>()</code>
<div class="block">Decrements the count of the latch, releasing all waiting threads
on all nodes if the count reaches zero.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#countDown-int-">countDown</a></span>(int&nbsp;val)</code>
<div class="block">Decreases the count of the latch using passed in value,
releasing all waiting threads on all nodes if the count reaches zero.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#countDownAll--">countDownAll</a></span>()</code>
<div class="block">Counts down this latch to zero, releasing all waiting threads on all nodes.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#initialCount--">initialCount</a></span>()</code>
<div class="block">Gets initial count value of the latch.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#name--">name</a></span>()</code>
<div class="block">Gets name of the latch.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/ignite/IgniteCountDownLatch.html#removed--">removed</a></span>()</code>
<div class="block">Gets <code>removed</code> status of the latch.</div>
</td>
</tr>
</table>
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<h4>name</h4>
<pre><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name()</pre>
<div class="block">Gets name of the latch.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Name of the latch.</dd>
</dl>
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<h4>count</h4>
<pre>int&nbsp;count()</pre>
<div class="block">Gets current count value of the latch.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Current count.</dd>
</dl>
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<h4>initialCount</h4>
<pre>int&nbsp;initialCount()</pre>
<div class="block">Gets initial count value of the latch.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Initial count.</dd>
</dl>
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<pre>boolean&nbsp;autoDelete()</pre>
<div class="block">Gets <code>autoDelete</code> flag. If this flag is <code>true</code> latch is removed
from cache when it has been counted down to 0.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Value of <code>autoDelete</code> flag.</dd>
</dl>
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<h4>await</h4>
<pre>void&nbsp;await()
throws <a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre>
<div class="block">Causes the current thread to wait until the latch has counted down to
zero, unless current thread is interrupted.
<p>
If the current count of the latch is zero then this method returns immediately.
<p>
If the current count is greater than zero then the current
thread becomes disabled for thread scheduling purposes and lies
dormant until one of two things happen:
<ul>
<li>The count reaches zero due to invocations of the
<a href="../../../org/apache/ignite/IgniteCountDownLatch.html#countDown--"><code>countDown()</code></a> method on any node; or
<li>Some other thread interrupts the current thread.
</ul>
<p>
If the current thread:
<ul>
<li>has its interrupted status set on entry to this method; or
<li>is interrupted while waiting,
</ul>
then <code>IgniteInterruptedCheckedException</code> is thrown and the current thread's
interrupted status is cleared.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If operation failed.</dd>
<dd><code><a href="../../../org/apache/ignite/IgniteInterruptedException.html" title="class in org.apache.ignite">IgniteInterruptedException</a></code> - if the current thread is interrupted
while waiting</dd>
</dl>
</li>
</ul>
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<h4>await</h4>
<pre>boolean&nbsp;await(long&nbsp;timeout)
throws <a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre>
<div class="block">Causes the current thread to wait until the latch has counted down to
zero, unless the thread is interrupted, or the specified waiting time elapses.
<p>
If the current count is zero then this method returns immediately
with the value <code>true</code>.
<p>
If the current count is greater than zero then the current
thread becomes disabled for thread scheduling purposes and lies
dormant until one of three things happen:
<ul>
<li>The count reaches zero due to invocations of the
<a href="../../../org/apache/ignite/IgniteCountDownLatch.html#countDown--"><code>countDown()</code></a> method on any node; or
<li>Some other thread interrupts the current thread; or
<li>The specified waiting time elapses.
</ul>
<p>
If the count reaches zero then the method returns with the
value <code>true</code>.
<p>
If the current thread:
<ul>
<li>has its interrupted status set on entry to this method; or
<li>is interrupted while waiting,
</ul>
then <code>IgniteInterruptedCheckedException</code> is thrown and the current thread's
interrupted status is cleared.
<p>
If the specified waiting time elapses then the value <code>false</code>
is returned. If the time is less than or equal to zero, the method
will not wait at all.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>timeout</code> - The maximum time to wait in milliseconds.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>True</code> if the count reached zero and <code>false</code>
if the waiting time elapsed before the count reached zero.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../org/apache/ignite/IgniteInterruptedException.html" title="class in org.apache.ignite">IgniteInterruptedException</a></code> - If the current thread is interrupted
while waiting.</dd>
<dd><code><a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If operation failed.</dd>
</dl>
</li>
</ul>
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<h4>await</h4>
<pre>boolean&nbsp;await(long&nbsp;timeout,
<a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</a>&nbsp;unit)
throws <a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre>
<div class="block">Causes the current thread to wait until the latch has counted down to
zero, unless the thread is interrupted, or the specified waiting time elapses.
<p>
If the current count is zero then this method returns immediately
with the value <code>true</code>.
<p>
If the current count is greater than zero then the current
thread becomes disabled for thread scheduling purposes and lies
dormant until one of three things happen:
<ul>
<li>The count reaches zero due to invocations of the
<a href="../../../org/apache/ignite/IgniteCountDownLatch.html#countDown--"><code>countDown()</code></a> method on any node; or
<li>Some other thread interrupts the current thread; or
<li>The specified waiting time elapses.
</ul>
<p>
If the count reaches zero then the method returns with the
value <code>true</code>.
<p>
If the current thread:
<ul>
<li>has its interrupted status set on entry to this method; or
<li>is interrupted while waiting,
</ul>
then <code>IgniteInterruptedCheckedException</code> is thrown and the current thread's
interrupted status is cleared.
<p>
If the specified waiting time elapses then the value <code>false</code>
is returned. If the time is less than or equal to zero, the method
will not wait at all.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>timeout</code> - The maximum time to wait.</dd>
<dd><code>unit</code> - The time unit of the <code>timeout</code> argument.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>True</code> if the count reached zero and <code>false</code>
if the waiting time elapsed before the count reached zero.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../org/apache/ignite/IgniteInterruptedException.html" title="class in org.apache.ignite">IgniteInterruptedException</a></code> - If the current thread is interrupted
while waiting.</dd>
<dd><code><a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If operation failed.</dd>
</dl>
</li>
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<h4>countDown</h4>
<pre>int&nbsp;countDown()
throws <a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre>
<div class="block">Decrements the count of the latch, releasing all waiting threads
on all nodes if the count reaches zero.
<p>
If the current count is greater than zero then it is decremented.
If the new count is zero then all waiting threads are re-enabled for
thread scheduling purposes.
<p>
If the current count equals zero then nothing happens.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Count after decrement.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If operation failed.</dd>
</dl>
</li>
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<h4>countDown</h4>
<pre>int&nbsp;countDown(int&nbsp;val)
throws <a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre>
<div class="block">Decreases the count of the latch using passed in value,
releasing all waiting threads on all nodes if the count reaches zero.
<p>
If the current count is greater than zero then it is decreased.
If the new count is zero then all waiting threads are re-enabled for
thread scheduling purposes.
<p>
If the current count equals zero then nothing happens.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>val</code> - Value to decrease counter on.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Count after decreasing.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If operation failed.</dd>
</dl>
</li>
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<h4>countDownAll</h4>
<pre>void&nbsp;countDownAll()
throws <a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></pre>
<div class="block">Counts down this latch to zero, releasing all waiting threads on all nodes.
<p>
If the current count equals zero then nothing happens.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If operation failed.</dd>
</dl>
</li>
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<h4>removed</h4>
<pre>boolean&nbsp;removed()</pre>
<div class="block">Gets <code>removed</code> status of the latch.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>True</code> if latch was removed from cache, <code>false</code> otherwise.</dd>
</dl>
</li>
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<h4>close</h4>
<pre>void&nbsp;close()</pre>
<div class="block">Removes this count down latch.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
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<p class="legalCopy"><small><table width="100%" border="0" cellspacing=0 cellpadding=0 style="padding: 5px"> <tr> <td> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <a target=_blank href="https://ignite.apache.org"><nobr>2018 Copyright &#169; Apache Software Foundation</nobr></a> </td> </tr> </tbody> </table> </td> <td width="100%" align="right" valign="center"> <a href="https://twitter.com/ApacheIgnite" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @ApacheIgnite</a> </td> </tr> <tr> <td colspan="2" valign="top" align="left"> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <b>Ignite Fabric</b> </td> <td>:&nbsp;&nbsp; ver. <strong>2.6.0</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>:&nbsp;&nbsp; July 10 2018 </td> </tr> </tbody> </table> </td> </tr> </table></small></p>
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