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<h2 title="Class DirectMemoryUtils" class="title">Class DirectMemoryUtils</h2>
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<pre>@InterfaceAudience.Private
@InterfaceStability.Evolving
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/DirectMemoryUtils.html#line.50">DirectMemoryUtils</a>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Utilities for interacting with and monitoring DirectByteBuffer allocations.</div>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DirectMemoryUtils.html#BEAN_SERVER">BEAN_SERVER</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static boolean</code></td>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DirectMemoryUtils.html#destroyDirectByteBuffer-java.nio.ByteBuffer-">destroyDirectByteBuffer</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;toBeDestroyed)</code>
<div class="block">DirectByteBuffers are garbage collected by using a phantom reference and a
reference queue.</div>
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<td class="colFirst"><code>static long</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/DirectMemoryUtils.html#getNettyDirectMemoryUsage--">getNettyDirectMemoryUsage</a></span>()</code>&nbsp;</td>
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<pre>private static final&nbsp;org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/util/DirectMemoryUtils.html#line.51">LOG</a></pre>
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<pre>public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/util/DirectMemoryUtils.html#line.50">DirectMemoryUtils</a>()</pre>
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<pre>public static&nbsp;long&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/util/DirectMemoryUtils.html#line.88">getDirectMemorySize</a>()</pre>
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<dt><span class="returnLabel">Returns:</span></dt>
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<pre>public static&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/util/DirectMemoryUtils.html#line.153">destroyDirectByteBuffer</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;toBeDestroyed)
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<div class="block">DirectByteBuffers are garbage collected by using a phantom reference and a
reference queue. Every once a while, the JVM checks the reference queue and
cleans the DirectByteBuffers. However, as this doesn't happen
immediately after discarding all references to a DirectByteBuffer, it's
easy to OutOfMemoryError yourself using DirectByteBuffers. This function
explicitly calls the Cleaner method of a DirectByteBuffer.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>toBeDestroyed</code> - The DirectByteBuffer that will be "cleaned". Utilizes reflection.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code></dd>
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