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Posted to commits@hbase.apache.org by mi...@apache.org on 2016/03/11 17:59:38 UTC
[04/51] [partial] hbase-site git commit: Published site at
eea8b38dfa0180d3e6f93d3e8055d5d4fbf673c3.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/0b785cb2/devapidocs/src-html/org/apache/hadoop/hbase/util/UnsafeAccess.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/util/UnsafeAccess.html b/devapidocs/src-html/org/apache/hadoop/hbase/util/UnsafeAccess.html
index 3a07b34..4e5ae7e 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/util/UnsafeAccess.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/util/UnsafeAccess.html
@@ -26,489 +26,460 @@
<span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.util;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.lang.reflect.Field;<a name="line.20"></a>
-<span class="sourceLineNo">021</span>import java.lang.reflect.Method;<a name="line.21"></a>
-<span class="sourceLineNo">022</span>import java.nio.ByteBuffer;<a name="line.22"></a>
-<span class="sourceLineNo">023</span>import java.nio.ByteOrder;<a name="line.23"></a>
-<span class="sourceLineNo">024</span>import java.security.AccessController;<a name="line.24"></a>
-<span class="sourceLineNo">025</span>import java.security.PrivilegedAction;<a name="line.25"></a>
-<span class="sourceLineNo">026</span><a name="line.26"></a>
-<span class="sourceLineNo">027</span>import org.apache.commons.logging.Log;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import org.apache.commons.logging.LogFactory;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.classification.InterfaceStability;<a name="line.30"></a>
-<span class="sourceLineNo">031</span><a name="line.31"></a>
-<span class="sourceLineNo">032</span>import sun.misc.Unsafe;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import sun.nio.ch.DirectBuffer;<a name="line.33"></a>
-<span class="sourceLineNo">034</span><a name="line.34"></a>
-<span class="sourceLineNo">035</span>@InterfaceAudience.Private<a name="line.35"></a>
-<span class="sourceLineNo">036</span>@InterfaceStability.Evolving<a name="line.36"></a>
-<span class="sourceLineNo">037</span>@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="REC_CATCH_EXCEPTION",<a name="line.37"></a>
-<span class="sourceLineNo">038</span> justification="If exception, presume unaligned")<a name="line.38"></a>
-<span class="sourceLineNo">039</span>public final class UnsafeAccess {<a name="line.39"></a>
-<span class="sourceLineNo">040</span><a name="line.40"></a>
-<span class="sourceLineNo">041</span> private static final Log LOG = LogFactory.getLog(UnsafeAccess.class);<a name="line.41"></a>
-<span class="sourceLineNo">042</span><a name="line.42"></a>
-<span class="sourceLineNo">043</span> static final Unsafe theUnsafe;<a name="line.43"></a>
-<span class="sourceLineNo">044</span> private static boolean unaligned;<a name="line.44"></a>
-<span class="sourceLineNo">045</span><a name="line.45"></a>
-<span class="sourceLineNo">046</span> /** The offset to the first element in a byte array. */<a name="line.46"></a>
-<span class="sourceLineNo">047</span> public static final long BYTE_ARRAY_BASE_OFFSET;<a name="line.47"></a>
-<span class="sourceLineNo">048</span><a name="line.48"></a>
-<span class="sourceLineNo">049</span> static final boolean littleEndian = ByteOrder.nativeOrder()<a name="line.49"></a>
-<span class="sourceLineNo">050</span> .equals(ByteOrder.LITTLE_ENDIAN);<a name="line.50"></a>
-<span class="sourceLineNo">051</span><a name="line.51"></a>
-<span class="sourceLineNo">052</span> // This number limits the number of bytes to copy per call to Unsafe's<a name="line.52"></a>
-<span class="sourceLineNo">053</span> // copyMemory method. A limit is imposed to allow for safepoint polling<a name="line.53"></a>
-<span class="sourceLineNo">054</span> // during a large copy<a name="line.54"></a>
-<span class="sourceLineNo">055</span> static final long UNSAFE_COPY_THRESHOLD = 1024L * 1024L;<a name="line.55"></a>
-<span class="sourceLineNo">056</span> static {<a name="line.56"></a>
-<span class="sourceLineNo">057</span> theUnsafe = (Unsafe) AccessController.doPrivileged(new PrivilegedAction<Object>() {<a name="line.57"></a>
-<span class="sourceLineNo">058</span> @Override<a name="line.58"></a>
-<span class="sourceLineNo">059</span> public Object run() {<a name="line.59"></a>
-<span class="sourceLineNo">060</span> try {<a name="line.60"></a>
-<span class="sourceLineNo">061</span> Field f = Unsafe.class.getDeclaredField("theUnsafe");<a name="line.61"></a>
-<span class="sourceLineNo">062</span> f.setAccessible(true);<a name="line.62"></a>
-<span class="sourceLineNo">063</span> return f.get(null);<a name="line.63"></a>
-<span class="sourceLineNo">064</span> } catch (Throwable e) {<a name="line.64"></a>
-<span class="sourceLineNo">065</span> LOG.warn("sun.misc.Unsafe is not accessible", e);<a name="line.65"></a>
-<span class="sourceLineNo">066</span> }<a name="line.66"></a>
-<span class="sourceLineNo">067</span> return null;<a name="line.67"></a>
-<span class="sourceLineNo">068</span> }<a name="line.68"></a>
-<span class="sourceLineNo">069</span> });<a name="line.69"></a>
-<span class="sourceLineNo">070</span><a name="line.70"></a>
-<span class="sourceLineNo">071</span> if (theUnsafe != null) {<a name="line.71"></a>
-<span class="sourceLineNo">072</span> BYTE_ARRAY_BASE_OFFSET = theUnsafe.arrayBaseOffset(byte[].class);<a name="line.72"></a>
-<span class="sourceLineNo">073</span> try {<a name="line.73"></a>
-<span class="sourceLineNo">074</span> // Using java.nio.Bits#unaligned() to check for unaligned-access capability<a name="line.74"></a>
-<span class="sourceLineNo">075</span> Class<?> clazz = Class.forName("java.nio.Bits");<a name="line.75"></a>
-<span class="sourceLineNo">076</span> Method m = clazz.getDeclaredMethod("unaligned");<a name="line.76"></a>
-<span class="sourceLineNo">077</span> m.setAccessible(true);<a name="line.77"></a>
-<span class="sourceLineNo">078</span> unaligned = (boolean) m.invoke(null);<a name="line.78"></a>
-<span class="sourceLineNo">079</span> } catch (Exception e) {<a name="line.79"></a>
-<span class="sourceLineNo">080</span> unaligned = false; // FindBugs: Causes REC_CATCH_EXCEPTION. Suppressed.<a name="line.80"></a>
-<span class="sourceLineNo">081</span> }<a name="line.81"></a>
-<span class="sourceLineNo">082</span> } else{<a name="line.82"></a>
-<span class="sourceLineNo">083</span> BYTE_ARRAY_BASE_OFFSET = -1;<a name="line.83"></a>
-<span class="sourceLineNo">084</span> unaligned = false;<a name="line.84"></a>
-<span class="sourceLineNo">085</span> }<a name="line.85"></a>
-<span class="sourceLineNo">086</span> }<a name="line.86"></a>
-<span class="sourceLineNo">087</span><a name="line.87"></a>
-<span class="sourceLineNo">088</span> private UnsafeAccess(){}<a name="line.88"></a>
-<span class="sourceLineNo">089</span><a name="line.89"></a>
-<span class="sourceLineNo">090</span> /**<a name="line.90"></a>
-<span class="sourceLineNo">091</span> * @return true when running JVM is having sun's Unsafe package available in it.<a name="line.91"></a>
-<span class="sourceLineNo">092</span> */<a name="line.92"></a>
-<span class="sourceLineNo">093</span> public static boolean isAvailable() {<a name="line.93"></a>
-<span class="sourceLineNo">094</span> return theUnsafe != null;<a name="line.94"></a>
-<span class="sourceLineNo">095</span> }<a name="line.95"></a>
-<span class="sourceLineNo">096</span><a name="line.96"></a>
-<span class="sourceLineNo">097</span> /**<a name="line.97"></a>
-<span class="sourceLineNo">098</span> * @return true when running JVM is having sun's Unsafe package available in it and underlying<a name="line.98"></a>
-<span class="sourceLineNo">099</span> * system having unaligned-access capability.<a name="line.99"></a>
-<span class="sourceLineNo">100</span> */<a name="line.100"></a>
-<span class="sourceLineNo">101</span> public static boolean unaligned() {<a name="line.101"></a>
-<span class="sourceLineNo">102</span> return unaligned;<a name="line.102"></a>
+<span class="sourceLineNo">021</span>import java.nio.ByteBuffer;<a name="line.21"></a>
+<span class="sourceLineNo">022</span>import java.nio.ByteOrder;<a name="line.22"></a>
+<span class="sourceLineNo">023</span>import java.security.AccessController;<a name="line.23"></a>
+<span class="sourceLineNo">024</span>import java.security.PrivilegedAction;<a name="line.24"></a>
+<span class="sourceLineNo">025</span><a name="line.25"></a>
+<span class="sourceLineNo">026</span>import org.apache.commons.logging.Log;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import org.apache.commons.logging.LogFactory;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.classification.InterfaceStability;<a name="line.29"></a>
+<span class="sourceLineNo">030</span><a name="line.30"></a>
+<span class="sourceLineNo">031</span>import sun.misc.Unsafe;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import sun.nio.ch.DirectBuffer;<a name="line.32"></a>
+<span class="sourceLineNo">033</span><a name="line.33"></a>
+<span class="sourceLineNo">034</span>@InterfaceAudience.Private<a name="line.34"></a>
+<span class="sourceLineNo">035</span>@InterfaceStability.Evolving<a name="line.35"></a>
+<span class="sourceLineNo">036</span>public final class UnsafeAccess {<a name="line.36"></a>
+<span class="sourceLineNo">037</span><a name="line.37"></a>
+<span class="sourceLineNo">038</span> private static final Log LOG = LogFactory.getLog(UnsafeAccess.class);<a name="line.38"></a>
+<span class="sourceLineNo">039</span><a name="line.39"></a>
+<span class="sourceLineNo">040</span> static final Unsafe theUnsafe;<a name="line.40"></a>
+<span class="sourceLineNo">041</span><a name="line.41"></a>
+<span class="sourceLineNo">042</span> /** The offset to the first element in a byte array. */<a name="line.42"></a>
+<span class="sourceLineNo">043</span> public static final long BYTE_ARRAY_BASE_OFFSET;<a name="line.43"></a>
+<span class="sourceLineNo">044</span><a name="line.44"></a>
+<span class="sourceLineNo">045</span> static final boolean littleEndian = ByteOrder.nativeOrder()<a name="line.45"></a>
+<span class="sourceLineNo">046</span> .equals(ByteOrder.LITTLE_ENDIAN);<a name="line.46"></a>
+<span class="sourceLineNo">047</span><a name="line.47"></a>
+<span class="sourceLineNo">048</span> // This number limits the number of bytes to copy per call to Unsafe's<a name="line.48"></a>
+<span class="sourceLineNo">049</span> // copyMemory method. A limit is imposed to allow for safepoint polling<a name="line.49"></a>
+<span class="sourceLineNo">050</span> // during a large copy<a name="line.50"></a>
+<span class="sourceLineNo">051</span> static final long UNSAFE_COPY_THRESHOLD = 1024L * 1024L;<a name="line.51"></a>
+<span class="sourceLineNo">052</span> static {<a name="line.52"></a>
+<span class="sourceLineNo">053</span> theUnsafe = (Unsafe) AccessController.doPrivileged(new PrivilegedAction<Object>() {<a name="line.53"></a>
+<span class="sourceLineNo">054</span> @Override<a name="line.54"></a>
+<span class="sourceLineNo">055</span> public Object run() {<a name="line.55"></a>
+<span class="sourceLineNo">056</span> try {<a name="line.56"></a>
+<span class="sourceLineNo">057</span> Field f = Unsafe.class.getDeclaredField("theUnsafe");<a name="line.57"></a>
+<span class="sourceLineNo">058</span> f.setAccessible(true);<a name="line.58"></a>
+<span class="sourceLineNo">059</span> return f.get(null);<a name="line.59"></a>
+<span class="sourceLineNo">060</span> } catch (Throwable e) {<a name="line.60"></a>
+<span class="sourceLineNo">061</span> LOG.warn("sun.misc.Unsafe is not accessible", e);<a name="line.61"></a>
+<span class="sourceLineNo">062</span> }<a name="line.62"></a>
+<span class="sourceLineNo">063</span> return null;<a name="line.63"></a>
+<span class="sourceLineNo">064</span> }<a name="line.64"></a>
+<span class="sourceLineNo">065</span> });<a name="line.65"></a>
+<span class="sourceLineNo">066</span><a name="line.66"></a>
+<span class="sourceLineNo">067</span> if (theUnsafe != null) {<a name="line.67"></a>
+<span class="sourceLineNo">068</span> BYTE_ARRAY_BASE_OFFSET = theUnsafe.arrayBaseOffset(byte[].class);<a name="line.68"></a>
+<span class="sourceLineNo">069</span> } else{<a name="line.69"></a>
+<span class="sourceLineNo">070</span> BYTE_ARRAY_BASE_OFFSET = -1;<a name="line.70"></a>
+<span class="sourceLineNo">071</span> }<a name="line.71"></a>
+<span class="sourceLineNo">072</span> }<a name="line.72"></a>
+<span class="sourceLineNo">073</span><a name="line.73"></a>
+<span class="sourceLineNo">074</span> private UnsafeAccess(){}<a name="line.74"></a>
+<span class="sourceLineNo">075</span><a name="line.75"></a>
+<span class="sourceLineNo">076</span> // APIs to read primitive data from a byte[] using Unsafe way<a name="line.76"></a>
+<span class="sourceLineNo">077</span> /**<a name="line.77"></a>
+<span class="sourceLineNo">078</span> * Converts a byte array to a short value considering it was written in big-endian format.<a name="line.78"></a>
+<span class="sourceLineNo">079</span> * @param bytes byte array<a name="line.79"></a>
+<span class="sourceLineNo">080</span> * @param offset offset into array<a name="line.80"></a>
+<span class="sourceLineNo">081</span> * @return the short value<a name="line.81"></a>
+<span class="sourceLineNo">082</span> */<a name="line.82"></a>
+<span class="sourceLineNo">083</span> public static short toShort(byte[] bytes, int offset) {<a name="line.83"></a>
+<span class="sourceLineNo">084</span> if (littleEndian) {<a name="line.84"></a>
+<span class="sourceLineNo">085</span> return Short.reverseBytes(theUnsafe.getShort(bytes, offset + BYTE_ARRAY_BASE_OFFSET));<a name="line.85"></a>
+<span class="sourceLineNo">086</span> } else {<a name="line.86"></a>
+<span class="sourceLineNo">087</span> return theUnsafe.getShort(bytes, offset + BYTE_ARRAY_BASE_OFFSET);<a name="line.87"></a>
+<span class="sourceLineNo">088</span> }<a name="line.88"></a>
+<span class="sourceLineNo">089</span> }<a name="line.89"></a>
+<span class="sourceLineNo">090</span><a name="line.90"></a>
+<span class="sourceLineNo">091</span> /**<a name="line.91"></a>
+<span class="sourceLineNo">092</span> * Converts a byte array to an int value considering it was written in big-endian format.<a name="line.92"></a>
+<span class="sourceLineNo">093</span> * @param bytes byte array<a name="line.93"></a>
+<span class="sourceLineNo">094</span> * @param offset offset into array<a name="line.94"></a>
+<span class="sourceLineNo">095</span> * @return the int value<a name="line.95"></a>
+<span class="sourceLineNo">096</span> */<a name="line.96"></a>
+<span class="sourceLineNo">097</span> public static int toInt(byte[] bytes, int offset) {<a name="line.97"></a>
+<span class="sourceLineNo">098</span> if (littleEndian) {<a name="line.98"></a>
+<span class="sourceLineNo">099</span> return Integer.reverseBytes(theUnsafe.getInt(bytes, offset + BYTE_ARRAY_BASE_OFFSET));<a name="line.99"></a>
+<span class="sourceLineNo">100</span> } else {<a name="line.100"></a>
+<span class="sourceLineNo">101</span> return theUnsafe.getInt(bytes, offset + BYTE_ARRAY_BASE_OFFSET);<a name="line.101"></a>
+<span class="sourceLineNo">102</span> }<a name="line.102"></a>
<span class="sourceLineNo">103</span> }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
-<span class="sourceLineNo">105</span> // APIs to read primitive data from a byte[] using Unsafe way<a name="line.105"></a>
-<span class="sourceLineNo">106</span> /**<a name="line.106"></a>
-<span class="sourceLineNo">107</span> * Converts a byte array to a short value considering it was written in big-endian format.<a name="line.107"></a>
-<span class="sourceLineNo">108</span> * @param bytes byte array<a name="line.108"></a>
-<span class="sourceLineNo">109</span> * @param offset offset into array<a name="line.109"></a>
-<span class="sourceLineNo">110</span> * @return the short value<a name="line.110"></a>
-<span class="sourceLineNo">111</span> */<a name="line.111"></a>
-<span class="sourceLineNo">112</span> public static short toShort(byte[] bytes, int offset) {<a name="line.112"></a>
-<span class="sourceLineNo">113</span> if (littleEndian) {<a name="line.113"></a>
-<span class="sourceLineNo">114</span> return Short.reverseBytes(theUnsafe.getShort(bytes, offset + BYTE_ARRAY_BASE_OFFSET));<a name="line.114"></a>
-<span class="sourceLineNo">115</span> } else {<a name="line.115"></a>
-<span class="sourceLineNo">116</span> return theUnsafe.getShort(bytes, offset + BYTE_ARRAY_BASE_OFFSET);<a name="line.116"></a>
-<span class="sourceLineNo">117</span> }<a name="line.117"></a>
-<span class="sourceLineNo">118</span> }<a name="line.118"></a>
-<span class="sourceLineNo">119</span><a name="line.119"></a>
+<span class="sourceLineNo">105</span> /**<a name="line.105"></a>
+<span class="sourceLineNo">106</span> * Converts a byte array to a long value considering it was written in big-endian format.<a name="line.106"></a>
+<span class="sourceLineNo">107</span> * @param bytes byte array<a name="line.107"></a>
+<span class="sourceLineNo">108</span> * @param offset offset into array<a name="line.108"></a>
+<span class="sourceLineNo">109</span> * @return the long value<a name="line.109"></a>
+<span class="sourceLineNo">110</span> */<a name="line.110"></a>
+<span class="sourceLineNo">111</span> public static long toLong(byte[] bytes, int offset) {<a name="line.111"></a>
+<span class="sourceLineNo">112</span> if (littleEndian) {<a name="line.112"></a>
+<span class="sourceLineNo">113</span> return Long.reverseBytes(theUnsafe.getLong(bytes, offset + BYTE_ARRAY_BASE_OFFSET));<a name="line.113"></a>
+<span class="sourceLineNo">114</span> } else {<a name="line.114"></a>
+<span class="sourceLineNo">115</span> return theUnsafe.getLong(bytes, offset + BYTE_ARRAY_BASE_OFFSET);<a name="line.115"></a>
+<span class="sourceLineNo">116</span> }<a name="line.116"></a>
+<span class="sourceLineNo">117</span> }<a name="line.117"></a>
+<span class="sourceLineNo">118</span><a name="line.118"></a>
+<span class="sourceLineNo">119</span> // APIs to write primitive data to a byte[] using Unsafe way<a name="line.119"></a>
<span class="sourceLineNo">120</span> /**<a name="line.120"></a>
-<span class="sourceLineNo">121</span> * Converts a byte array to an int value considering it was written in big-endian format.<a name="line.121"></a>
-<span class="sourceLineNo">122</span> * @param bytes byte array<a name="line.122"></a>
-<span class="sourceLineNo">123</span> * @param offset offset into array<a name="line.123"></a>
-<span class="sourceLineNo">124</span> * @return the int value<a name="line.124"></a>
-<span class="sourceLineNo">125</span> */<a name="line.125"></a>
-<span class="sourceLineNo">126</span> public static int toInt(byte[] bytes, int offset) {<a name="line.126"></a>
-<span class="sourceLineNo">127</span> if (littleEndian) {<a name="line.127"></a>
-<span class="sourceLineNo">128</span> return Integer.reverseBytes(theUnsafe.getInt(bytes, offset + BYTE_ARRAY_BASE_OFFSET));<a name="line.128"></a>
-<span class="sourceLineNo">129</span> } else {<a name="line.129"></a>
-<span class="sourceLineNo">130</span> return theUnsafe.getInt(bytes, offset + BYTE_ARRAY_BASE_OFFSET);<a name="line.130"></a>
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-<span class="sourceLineNo">136</span> * @param bytes byte array<a name="line.136"></a>
-<span class="sourceLineNo">137</span> * @param offset offset into array<a name="line.137"></a>
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-<span class="sourceLineNo">140</span> public static long toLong(byte[] bytes, int offset) {<a name="line.140"></a>
-<span class="sourceLineNo">141</span> if (littleEndian) {<a name="line.141"></a>
-<span class="sourceLineNo">142</span> return Long.reverseBytes(theUnsafe.getLong(bytes, offset + BYTE_ARRAY_BASE_OFFSET));<a name="line.142"></a>
-<span class="sourceLineNo">143</span> } else {<a name="line.143"></a>
-<span class="sourceLineNo">144</span> return theUnsafe.getLong(bytes, offset + BYTE_ARRAY_BASE_OFFSET);<a name="line.144"></a>
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+<span class="sourceLineNo">122</span> * @param bytes the byte array<a name="line.122"></a>
+<span class="sourceLineNo">123</span> * @param offset position in the array<a name="line.123"></a>
+<span class="sourceLineNo">124</span> * @param val short to write out<a name="line.124"></a>
+<span class="sourceLineNo">125</span> * @return incremented offset<a name="line.125"></a>
+<span class="sourceLineNo">126</span> */<a name="line.126"></a>
+<span class="sourceLineNo">127</span> public static int putShort(byte[] bytes, int offset, short val) {<a name="line.127"></a>
+<span class="sourceLineNo">128</span> if (littleEndian) {<a name="line.128"></a>
+<span class="sourceLineNo">129</span> val = Short.reverseBytes(val);<a name="line.129"></a>
+<span class="sourceLineNo">130</span> }<a name="line.130"></a>
+<span class="sourceLineNo">131</span> theUnsafe.putShort(bytes, offset + BYTE_ARRAY_BASE_OFFSET, val);<a name="line.131"></a>
+<span class="sourceLineNo">132</span> return offset + Bytes.SIZEOF_SHORT;<a name="line.132"></a>
+<span class="sourceLineNo">133</span> }<a name="line.133"></a>
+<span class="sourceLineNo">134</span><a name="line.134"></a>
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