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| <div class="subTitle">com.yahoo.memory</div> |
| <h2 title="Class UnsafeUtil" class="title">Class UnsafeUtil</h2> |
| </div> |
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| <ul class="inheritance"> |
| <li><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>com.yahoo.memory.UnsafeUtil</li> |
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| <pre>public final class <span class="typeNameLabel">UnsafeUtil</span> |
| extends <a href="http://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">Provides access to the sun.misc.Unsafe class and its key static fields. |
| |
| <p>The internal static initializer also detects whether the methods unique to the Unsafe class in |
| JDK8 are present; if not, methods that are compatible with JDK7 are substituted using an internal |
| interface. In order for this to work, this library still needs to be compiled using jdk8 |
| and it must be done with both source and target versions of jdk7 specified in pom.xml. |
| The resultant jar will work on jdk7 and jdk8.</p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Lee Rhodes</dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ADDRESS_SIZE">ADDRESS_SIZE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_BOOLEAN_BASE_OFFSET">ARRAY_BOOLEAN_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_BOOLEAN_INDEX_SCALE">ARRAY_BOOLEAN_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_BYTE_BASE_OFFSET">ARRAY_BYTE_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_BYTE_INDEX_SCALE">ARRAY_BYTE_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_CHAR_BASE_OFFSET">ARRAY_CHAR_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_CHAR_INDEX_SCALE">ARRAY_CHAR_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_DOUBLE_BASE_OFFSET">ARRAY_DOUBLE_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_DOUBLE_INDEX_SCALE">ARRAY_DOUBLE_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_FLOAT_BASE_OFFSET">ARRAY_FLOAT_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_FLOAT_INDEX_SCALE">ARRAY_FLOAT_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_INT_BASE_OFFSET">ARRAY_INT_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_INT_INDEX_SCALE">ARRAY_INT_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_LONG_BASE_OFFSET">ARRAY_LONG_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_LONG_INDEX_SCALE">ARRAY_LONG_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_OBJECT_BASE_OFFSET">ARRAY_OBJECT_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_OBJECT_INDEX_SCALE">ARRAY_OBJECT_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_SHORT_BASE_OFFSET">ARRAY_SHORT_BASE_OFFSET</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#ARRAY_SHORT_INDEX_SCALE">ARRAY_SHORT_INDEX_SCALE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#BOOLEAN_SHIFT">BOOLEAN_SHIFT</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#BYTE_SHIFT">BYTE_SHIFT</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#CHAR_SHIFT">CHAR_SHIFT</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#DOUBLE_SHIFT">DOUBLE_SHIFT</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#FLOAT_SHIFT">FLOAT_SHIFT</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#INT_SHIFT">INT_SHIFT</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#JDK">JDK</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#LONG_SHIFT">LONG_SHIFT</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <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="../../../com/yahoo/memory/UnsafeUtil.html#LS">LS</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#SHORT_SHIFT">SHORT_SHIFT</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static sun.misc.Unsafe</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#unsafe">unsafe</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#UNSAFE_COPY_THRESHOLD">UNSAFE_COPY_THRESHOLD</a></span></code> |
| <div class="block">Large memory copies are broken into segments of bytes of this size to allow for safepoint |
| polling by the JVM.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <!-- --> |
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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"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </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>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#assertBounds-long-long-long-">assertBounds</a></span>(long reqOff, |
| long reqLen, |
| long allocSize)</code> |
| <div class="block">Perform bounds checking using java assert (if enabled) checking the requested offset and length |
| against the allocated size.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#checkBounds-long-long-long-">checkBounds</a></span>(long reqOff, |
| long reqLen, |
| long allocSize)</code> |
| <div class="block">Check the requested offset and length against the allocated size.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../com/yahoo/memory/UnsafeUtil.html#checkOverlap-long-long-long-">checkOverlap</a></span>(long srcOff, |
| long dstOff, |
| long length)</code> |
| <div class="block">Return true if the given offsets and length do not overlap.</div> |
| </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
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| <h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <h3>Field Detail</h3> |
| <a name="unsafe"> |
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| </a> |
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| <h4>unsafe</h4> |
| <pre>public static final sun.misc.Unsafe unsafe</pre> |
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| <a name="JDK"> |
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| </a> |
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| <h4>JDK</h4> |
| <pre>public static final int JDK</pre> |
| </li> |
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| </a> |
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| <h4>ADDRESS_SIZE</h4> |
| <pre>public static final int ADDRESS_SIZE</pre> |
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| <pre>public static final int ARRAY_BOOLEAN_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_BYTE_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_SHORT_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_CHAR_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_INT_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_LONG_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_FLOAT_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_DOUBLE_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_OBJECT_BASE_OFFSET</pre> |
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| <pre>public static final int ARRAY_BOOLEAN_INDEX_SCALE</pre> |
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| <pre>public static final int ARRAY_SHORT_INDEX_SCALE</pre> |
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| <pre>public static final int ARRAY_CHAR_INDEX_SCALE</pre> |
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| <pre>public static final int ARRAY_OBJECT_INDEX_SCALE</pre> |
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| <pre>public static final int BOOLEAN_SHIFT</pre> |
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| <dd><a href="../../../constant-values.html#com.yahoo.memory.UnsafeUtil.BOOLEAN_SHIFT">Constant Field Values</a></dd> |
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| <pre>public static final int BYTE_SHIFT</pre> |
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| <pre>public static final int CHAR_SHIFT</pre> |
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| <pre>public static final int FLOAT_SHIFT</pre> |
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| <h4>UNSAFE_COPY_THRESHOLD</h4> |
| <pre>public static final long UNSAFE_COPY_THRESHOLD</pre> |
| <div class="block">Large memory copies are broken into segments of bytes of this size to allow for safepoint |
| polling by the JVM.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../constant-values.html#com.yahoo.memory.UnsafeUtil.UNSAFE_COPY_THRESHOLD">Constant Field Values</a></dd> |
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| <pre>public static void assertBounds(long reqOff, |
| long reqLen, |
| long allocSize)</pre> |
| <div class="block">Perform bounds checking using java assert (if enabled) checking the requested offset and length |
| against the allocated size. |
| If reqOff + reqLen > allocSize or any of the parameters are negative an exception will |
| be thrown.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>reqOff</code> - the requested offset</dd> |
| <dd><code>reqLen</code> - the requested length</dd> |
| <dd><code>allocSize</code> - the allocated size.</dd> |
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| <pre>public static void checkBounds(long reqOff, |
| long reqLen, |
| long allocSize)</pre> |
| <div class="block">Check the requested offset and length against the allocated size. |
| If reqOff + reqLen > allocSize or any of the parameters are negative an exception will |
| be thrown.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>reqOff</code> - the requested offset</dd> |
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| <dd><code>allocSize</code> - the allocated size.</dd> |
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| <pre>public static boolean checkOverlap(long srcOff, |
| long dstOff, |
| long length)</pre> |
| <div class="block">Return true if the given offsets and length do not overlap.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>srcOff</code> - the start of the source region</dd> |
| <dd><code>dstOff</code> - the start of the destination region</dd> |
| <dd><code>length</code> - the length of both regions</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the given offsets and length do not overlap.</dd> |
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