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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  <html lang="en"> <head>  <title>ObjectSizes (apache-cassandra API)</title> <meta name="date" content="2014-09-07"> <link rel="stylesheet" type="text/css" href="../../../../stylesheet.css" title="Style"> </head> <body> <script type="text/javascript"> </script> <noscript> <div>JavaScript is disabled on your browser.</div> </noscript>  <div class="topNav"><a name="navbar_top">  </a><a href="#skip-navbar_top" title="Skip navigation links"></a><a name="navbar_top_firstrow">  </a> <ul class="navList" title="Navigation"> <li><a href="../../../../overview-summary.html">Overview</a></li> <li><a href="package-summary.html">Package</a></li> <li class="navBarCell1Rev">Class</li> <li><a href="class-use/ObjectSizes.html">Use</a></li> <li><a href="package-tree.html">Tree</a></li> <li><a href="../../../../deprecated-list.html">Deprecated</a></li> <li><a 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href="#constructor_summary">Constr</a> | </li> <li><a href="#method_summary">Method</a></li> </ul> <ul class="subNavList"> <li>Detail: </li> <li>Field | </li> <li><a href="#constructor_detail">Constr</a> | </li> <li><a href="#method_detail">Method</a></li> </ul> </div> <a name="skip-navbar_top">  </a></div>   <div class="header"> <div class="subTitle">org.apache.cassandra.utils</div> <h2 title="Class ObjectSizes" class="title">Class ObjectSizes</h2> </div> <div class="contentContainer"> <ul class="inheritance"> <li>java.lang.Object</li> <li> <ul class="inheritance"> <li>org.apache.cassandra.utils.ObjectSizes</li> </ul> </li> </ul> <div class="description"> <ul class="blockList"> <li class="blockList"> <hr> <br> <pre>public class <span class="strong">ObjectSizes</span> extends java.lang.Object</pre> <div class="block">A convenience class for wrapping access to MemoryMeter</div> </li> </ul> </div> <div class="summary"> <ul class="blockList"> <li class="blockList">  <ul class="blockList"> <li class="blockList"><a name="constructor_summary">  </a> <h3>Constructor Summary</h3> <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation"> <caption><span>Constructors</span><span class="tabEnd"> </span></caption> <tr> <th class="colOne" scope="col">Constructor and Description</th> </tr> <tr class="altColor"> <td class="colOne"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#ObjectSizes()">ObjectSizes</a></strong>()</code> </td> </tr> </table> </li> </ul>  <ul class="blockList"> <li class="blockList"><a name="method_summary">  </a> <h3>Method Summary</h3> <table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> <caption><span>Methods</span><span class="tabEnd"> </span></caption> <tr> <th class="colFirst" scope="col">Modifier and Type</th> <th class="colLast" scope="col">Method and Description</th> </tr> <tr class="altColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#measure(java.lang.Object)">measure</a></strong>(java.lang.Object pojo)</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#measureDeep(java.lang.Object)">measureDeep</a></strong>(java.lang.Object pojo)</code> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOf(java.lang.String)">sizeOf</a></strong>(java.lang.String str)</code> <div class="block">Memory a String consumes</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOfArray(byte[])">sizeOfArray</a></strong>(byte[] bytes)</code> <div class="block">Memory a byte array consumes</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOfArray(int[])">sizeOfArray</a></strong>(int[] ints)</code> <div class="block">Memory an int array consumes</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOfArray(long[])">sizeOfArray</a></strong>(long[] longs)</code> <div class="block">Memory a long array consumes</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOfArray(java.lang.Object[])">sizeOfArray</a></strong>(java.lang.Object[] objects)</code> <div class="block">Memory a reference array consumes itself only</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOfReferenceArray(int)">sizeOfReferenceArray</a></strong>(int length)</code> <div class="block">Memory a reference array consumes</div> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOnHeapExcludingData(java.nio.ByteBuffer)">sizeOnHeapExcludingData</a></strong>(java.nio.ByteBuffer buffer)</code> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOnHeapExcludingData(java.nio.ByteBuffer[])">sizeOnHeapExcludingData</a></strong>(java.nio.ByteBuffer[] array)</code> </td> </tr> <tr class="altColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOnHeapOf(java.nio.ByteBuffer)">sizeOnHeapOf</a></strong>(java.nio.ByteBuffer buffer)</code> <div class="block">Memory a byte buffer consumes</div> </td> </tr> <tr class="rowColor"> <td class="colFirst"><code>static long</code></td> <td class="colLast"><code><strong><a href="../../../../org/apache/cassandra/utils/ObjectSizes.html#sizeOnHeapOf(java.nio.ByteBuffer[])">sizeOnHeapOf</a></strong>(java.nio.ByteBuffer[] array)</code> <div class="block">Memory a ByteBuffer array consumes.</div> </td> </tr> </table> <ul class="blockList"> <li class="blockList"><a name="methods_inherited_from_class_java.lang.Object">  </a> <h3>Methods inherited from class java.lang.Object</h3> <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> </ul> </li> </ul> </li> </ul> </div> <div class="details"> <ul class="blockList"> <li class="blockList">  <ul class="blockList"> <li class="blockList"><a name="constructor_detail">  </a> <h3>Constructor Detail</h3> <a name="ObjectSizes()">  </a> <ul class="blockListLast"> <li class="blockList"> <h4>ObjectSizes</h4> <pre>public ObjectSizes()</pre> </li> </ul> </li> </ul>  <ul class="blockList"> <li class="blockList"><a name="method_detail">  </a> <h3>Method Detail</h3> <a name="sizeOfArray(byte[])">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOfArray</h4> <pre>public static long sizeOfArray(byte[] bytes)</pre> <div class="block">Memory a byte array consumes</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>bytes</code> - byte array to get memory size</dd> <dt><span class="strong">Returns:</span></dt><dd>heap-size of the array</dd></dl> </li> </ul> <a name="sizeOfArray(long[])">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOfArray</h4> <pre>public static long sizeOfArray(long[] longs)</pre> <div class="block">Memory a long array consumes</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>longs</code> - byte array to get memory size</dd> <dt><span class="strong">Returns:</span></dt><dd>heap-size of the array</dd></dl> </li> </ul> <a name="sizeOfArray(int[])">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOfArray</h4> <pre>public static long sizeOfArray(int[] ints)</pre> <div class="block">Memory an int array consumes</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>ints</code> - byte array to get memory size</dd> <dt><span class="strong">Returns:</span></dt><dd>heap-size of the array</dd></dl> </li> </ul> <a name="sizeOfReferenceArray(int)">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOfReferenceArray</h4> <pre>public static long sizeOfReferenceArray(int length)</pre> <div class="block">Memory a reference array consumes</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>length</code> - the length of the reference array</dd> <dt><span class="strong">Returns:</span></dt><dd>heap-size of the array</dd></dl> </li> </ul> <a name="sizeOfArray(java.lang.Object[])">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOfArray</h4> <pre>public static long sizeOfArray(java.lang.Object[] objects)</pre> <div class="block">Memory a reference array consumes itself only</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>objects</code> - the array to size</dd> <dt><span class="strong">Returns:</span></dt><dd>heap-size of the array (excluding memory retained by referenced objects)</dd></dl> </li> </ul> <a name="sizeOnHeapOf(java.nio.ByteBuffer[])">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOnHeapOf</h4> <pre>public static long sizeOnHeapOf(java.nio.ByteBuffer[] array)</pre> <div class="block">Memory a ByteBuffer array consumes.</div> </li> </ul> <a name="sizeOnHeapExcludingData(java.nio.ByteBuffer[])">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOnHeapExcludingData</h4> <pre>public static long sizeOnHeapExcludingData(java.nio.ByteBuffer[] array)</pre> </li> </ul> <a name="sizeOnHeapOf(java.nio.ByteBuffer)">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOnHeapOf</h4> <pre>public static long sizeOnHeapOf(java.nio.ByteBuffer buffer)</pre> <div class="block">Memory a byte buffer consumes</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>buffer</code> - ByteBuffer to calculate in memory size</dd> <dt><span class="strong">Returns:</span></dt><dd>Total in-memory size of the byte buffer</dd></dl> </li> </ul> <a name="sizeOnHeapExcludingData(java.nio.ByteBuffer)">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOnHeapExcludingData</h4> <pre>public static long sizeOnHeapExcludingData(java.nio.ByteBuffer buffer)</pre> </li> </ul> <a name="sizeOf(java.lang.String)">  </a> <ul class="blockList"> <li class="blockList"> <h4>sizeOf</h4> <pre>public static long sizeOf(java.lang.String str)</pre> <div class="block">Memory a String consumes</div> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>str</code> - String to calculate memory size of</dd> <dt><span class="strong">Returns:</span></dt><dd>Total in-memory size of the String</dd></dl> </li> </ul> <a name="measureDeep(java.lang.Object)">  </a> <ul class="blockList"> <li class="blockList"> <h4>measureDeep</h4> <pre>public static long measureDeep(java.lang.Object pojo)</pre> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>pojo</code> - the object to measure</dd> <dt><span class="strong">Returns:</span></dt><dd>the size on the heap of the instance and all retained heap referenced by it, excluding portions of ByteBuffer that are not directly referenced by it but including any other referenced that may also be retained by other objects.</dd></dl> </li> </ul> <a name="measure(java.lang.Object)">  </a> <ul class="blockListLast"> <li class="blockList"> <h4>measure</h4> <pre>public static long measure(java.lang.Object pojo)</pre> <dl><dt><span class="strong">Parameters:</span></dt><dd><code>pojo</code> - the object to measure</dd> <dt><span class="strong">Returns:</span></dt><dd>the size on the heap of the instance only, excluding any referenced objects</dd></dl> </li> </ul> </li> </ul> </li> </ul> </div> </div>   <div class="bottomNav"><a name="navbar_bottom">  </a><a href="#skip-navbar_bottom" title="Skip navigation links"></a><a name="navbar_bottom_firstrow">  </a> <ul class="navList" title="Navigation"> <li><a href="../../../../overview-summary.html">Overview</a></li> <li><a href="package-summary.html">Package</a></li> <li class="navBarCell1Rev">Class</li> <li><a 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