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<pre><span class="source-line-no">001</span><span id="line-1">/*</span>
<span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span>
<span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span>
<span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span>
<span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span>
<span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span>
<span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span>
<span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span>
<span class="source-line-no">009</span><span id="line-9"> *</span>
<span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="source-line-no">011</span><span id="line-11"> *</span>
<span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span>
<span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span>
<span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span>
<span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span>
<span class="source-line-no">017</span><span id="line-17"> */</span>
<span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.util;</span>
<span class="source-line-no">019</span><span id="line-19"></span>
<span class="source-line-no">020</span><span id="line-20">import java.nio.ByteBuffer;</span>
<span class="source-line-no">021</span><span id="line-21">import java.nio.ByteOrder;</span>
<span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.hbase.unsafe.HBasePlatformDependent;</span>
<span class="source-line-no">023</span><span id="line-23">import org.apache.yetus.audience.InterfaceAudience;</span>
<span class="source-line-no">024</span><span id="line-24">import org.apache.yetus.audience.InterfaceStability;</span>
<span class="source-line-no">025</span><span id="line-25"></span>
<span class="source-line-no">026</span><span id="line-26">import org.apache.hbase.thirdparty.io.netty.util.internal.PlatformDependent;</span>
<span class="source-line-no">027</span><span id="line-27"></span>
<span class="source-line-no">028</span><span id="line-28">@InterfaceAudience.Private</span>
<span class="source-line-no">029</span><span id="line-29">@InterfaceStability.Evolving</span>
<span class="source-line-no">030</span><span id="line-30">public final class UnsafeAccess {</span>
<span class="source-line-no">031</span><span id="line-31"></span>
<span class="source-line-no">032</span><span id="line-32"> /** The offset to the first element in a byte array. */</span>
<span class="source-line-no">033</span><span id="line-33"> public static final long BYTE_ARRAY_BASE_OFFSET;</span>
<span class="source-line-no">034</span><span id="line-34"></span>
<span class="source-line-no">035</span><span id="line-35"> public static final boolean LITTLE_ENDIAN =</span>
<span class="source-line-no">036</span><span id="line-36"> ByteOrder.nativeOrder().equals(ByteOrder.LITTLE_ENDIAN);</span>
<span class="source-line-no">037</span><span id="line-37"></span>
<span class="source-line-no">038</span><span id="line-38"> // This number limits the number of bytes to copy per call to Unsafe's</span>
<span class="source-line-no">039</span><span id="line-39"> // copyMemory method. A limit is imposed to allow for safepoint polling</span>
<span class="source-line-no">040</span><span id="line-40"> // during a large copy</span>
<span class="source-line-no">041</span><span id="line-41"> static final long UNSAFE_COPY_THRESHOLD = 1024L * 1024L;</span>
<span class="source-line-no">042</span><span id="line-42"> static {</span>
<span class="source-line-no">043</span><span id="line-43"> if (HBasePlatformDependent.isUnsafeAvailable()) {</span>
<span class="source-line-no">044</span><span id="line-44"> BYTE_ARRAY_BASE_OFFSET = HBasePlatformDependent.arrayBaseOffset(byte[].class);</span>
<span class="source-line-no">045</span><span id="line-45"> } else {</span>
<span class="source-line-no">046</span><span id="line-46"> BYTE_ARRAY_BASE_OFFSET = -1;</span>
<span class="source-line-no">047</span><span id="line-47"> }</span>
<span class="source-line-no">048</span><span id="line-48"> }</span>
<span class="source-line-no">049</span><span id="line-49"></span>
<span class="source-line-no">050</span><span id="line-50"> private UnsafeAccess() {</span>
<span class="source-line-no">051</span><span id="line-51"> }</span>
<span class="source-line-no">052</span><span id="line-52"></span>
<span class="source-line-no">053</span><span id="line-53"> // APIs to read primitive data from a byte[] using Unsafe way</span>
<span class="source-line-no">054</span><span id="line-54"> /**</span>
<span class="source-line-no">055</span><span id="line-55"> * Converts a byte array to a short value considering it was written in big-endian format.</span>
<span class="source-line-no">056</span><span id="line-56"> * @param bytes byte array</span>
<span class="source-line-no">057</span><span id="line-57"> * @param offset offset into array</span>
<span class="source-line-no">058</span><span id="line-58"> * @return the short value</span>
<span class="source-line-no">059</span><span id="line-59"> */</span>
<span class="source-line-no">060</span><span id="line-60"> public static short toShort(byte[] bytes, int offset) {</span>
<span class="source-line-no">061</span><span id="line-61"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">062</span><span id="line-62"> return Short</span>
<span class="source-line-no">063</span><span id="line-63"> .reverseBytes(HBasePlatformDependent.getShort(bytes, offset + BYTE_ARRAY_BASE_OFFSET));</span>
<span class="source-line-no">064</span><span id="line-64"> } else {</span>
<span class="source-line-no">065</span><span id="line-65"> return HBasePlatformDependent.getShort(bytes, offset + BYTE_ARRAY_BASE_OFFSET);</span>
<span class="source-line-no">066</span><span id="line-66"> }</span>
<span class="source-line-no">067</span><span id="line-67"> }</span>
<span class="source-line-no">068</span><span id="line-68"></span>
<span class="source-line-no">069</span><span id="line-69"> /**</span>
<span class="source-line-no">070</span><span id="line-70"> * Converts a byte array to an int value considering it was written in big-endian format.</span>
<span class="source-line-no">071</span><span id="line-71"> * @param bytes byte array</span>
<span class="source-line-no">072</span><span id="line-72"> * @param offset offset into array</span>
<span class="source-line-no">073</span><span id="line-73"> * @return the int value</span>
<span class="source-line-no">074</span><span id="line-74"> */</span>
<span class="source-line-no">075</span><span id="line-75"> public static int toInt(byte[] bytes, int offset) {</span>
<span class="source-line-no">076</span><span id="line-76"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">077</span><span id="line-77"> return Integer</span>
<span class="source-line-no">078</span><span id="line-78"> .reverseBytes(HBasePlatformDependent.getInt(bytes, offset + BYTE_ARRAY_BASE_OFFSET));</span>
<span class="source-line-no">079</span><span id="line-79"> } else {</span>
<span class="source-line-no">080</span><span id="line-80"> return HBasePlatformDependent.getInt(bytes, offset + BYTE_ARRAY_BASE_OFFSET);</span>
<span class="source-line-no">081</span><span id="line-81"> }</span>
<span class="source-line-no">082</span><span id="line-82"> }</span>
<span class="source-line-no">083</span><span id="line-83"></span>
<span class="source-line-no">084</span><span id="line-84"> /**</span>
<span class="source-line-no">085</span><span id="line-85"> * Converts a byte array to a long value considering it was written in big-endian format.</span>
<span class="source-line-no">086</span><span id="line-86"> * @param bytes byte array</span>
<span class="source-line-no">087</span><span id="line-87"> * @param offset offset into array</span>
<span class="source-line-no">088</span><span id="line-88"> * @return the long value</span>
<span class="source-line-no">089</span><span id="line-89"> */</span>
<span class="source-line-no">090</span><span id="line-90"> public static long toLong(byte[] bytes, int offset) {</span>
<span class="source-line-no">091</span><span id="line-91"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">092</span><span id="line-92"> return Long</span>
<span class="source-line-no">093</span><span id="line-93"> .reverseBytes(HBasePlatformDependent.getLong(bytes, offset + BYTE_ARRAY_BASE_OFFSET));</span>
<span class="source-line-no">094</span><span id="line-94"> } else {</span>
<span class="source-line-no">095</span><span id="line-95"> return HBasePlatformDependent.getLong(bytes, offset + BYTE_ARRAY_BASE_OFFSET);</span>
<span class="source-line-no">096</span><span id="line-96"> }</span>
<span class="source-line-no">097</span><span id="line-97"> }</span>
<span class="source-line-no">098</span><span id="line-98"></span>
<span class="source-line-no">099</span><span id="line-99"> // APIs to write primitive data to a byte[] using Unsafe way</span>
<span class="source-line-no">100</span><span id="line-100"> /**</span>
<span class="source-line-no">101</span><span id="line-101"> * Put a short value out to the specified byte array position in big-endian format.</span>
<span class="source-line-no">102</span><span id="line-102"> * @param bytes the byte array</span>
<span class="source-line-no">103</span><span id="line-103"> * @param offset position in the array</span>
<span class="source-line-no">104</span><span id="line-104"> * @param val short to write out</span>
<span class="source-line-no">105</span><span id="line-105"> * @return incremented offset</span>
<span class="source-line-no">106</span><span id="line-106"> */</span>
<span class="source-line-no">107</span><span id="line-107"> public static int putShort(byte[] bytes, int offset, short val) {</span>
<span class="source-line-no">108</span><span id="line-108"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">109</span><span id="line-109"> val = Short.reverseBytes(val);</span>
<span class="source-line-no">110</span><span id="line-110"> }</span>
<span class="source-line-no">111</span><span id="line-111"> HBasePlatformDependent.putShort(bytes, offset + BYTE_ARRAY_BASE_OFFSET, val);</span>
<span class="source-line-no">112</span><span id="line-112"> return offset + Bytes.SIZEOF_SHORT;</span>
<span class="source-line-no">113</span><span id="line-113"> }</span>
<span class="source-line-no">114</span><span id="line-114"></span>
<span class="source-line-no">115</span><span id="line-115"> /**</span>
<span class="source-line-no">116</span><span id="line-116"> * Put an int value out to the specified byte array position in big-endian format.</span>
<span class="source-line-no">117</span><span id="line-117"> * @param bytes the byte array</span>
<span class="source-line-no">118</span><span id="line-118"> * @param offset position in the array</span>
<span class="source-line-no">119</span><span id="line-119"> * @param val int to write out</span>
<span class="source-line-no">120</span><span id="line-120"> * @return incremented offset</span>
<span class="source-line-no">121</span><span id="line-121"> */</span>
<span class="source-line-no">122</span><span id="line-122"> public static int putInt(byte[] bytes, int offset, int val) {</span>
<span class="source-line-no">123</span><span id="line-123"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">124</span><span id="line-124"> val = Integer.reverseBytes(val);</span>
<span class="source-line-no">125</span><span id="line-125"> }</span>
<span class="source-line-no">126</span><span id="line-126"> HBasePlatformDependent.putInt(bytes, offset + BYTE_ARRAY_BASE_OFFSET, val);</span>
<span class="source-line-no">127</span><span id="line-127"> return offset + Bytes.SIZEOF_INT;</span>
<span class="source-line-no">128</span><span id="line-128"> }</span>
<span class="source-line-no">129</span><span id="line-129"></span>
<span class="source-line-no">130</span><span id="line-130"> /**</span>
<span class="source-line-no">131</span><span id="line-131"> * Put a long value out to the specified byte array position in big-endian format.</span>
<span class="source-line-no">132</span><span id="line-132"> * @param bytes the byte array</span>
<span class="source-line-no">133</span><span id="line-133"> * @param offset position in the array</span>
<span class="source-line-no">134</span><span id="line-134"> * @param val long to write out</span>
<span class="source-line-no">135</span><span id="line-135"> * @return incremented offset</span>
<span class="source-line-no">136</span><span id="line-136"> */</span>
<span class="source-line-no">137</span><span id="line-137"> public static int putLong(byte[] bytes, int offset, long val) {</span>
<span class="source-line-no">138</span><span id="line-138"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">139</span><span id="line-139"> val = Long.reverseBytes(val);</span>
<span class="source-line-no">140</span><span id="line-140"> }</span>
<span class="source-line-no">141</span><span id="line-141"> HBasePlatformDependent.putLong(bytes, offset + BYTE_ARRAY_BASE_OFFSET, val);</span>
<span class="source-line-no">142</span><span id="line-142"> return offset + Bytes.SIZEOF_LONG;</span>
<span class="source-line-no">143</span><span id="line-143"> }</span>
<span class="source-line-no">144</span><span id="line-144"></span>
<span class="source-line-no">145</span><span id="line-145"> // APIs to read primitive data from a ByteBuffer using Unsafe way</span>
<span class="source-line-no">146</span><span id="line-146"> /**</span>
<span class="source-line-no">147</span><span id="line-147"> * Reads a short value at the given buffer's offset considering it was written in big-endian</span>
<span class="source-line-no">148</span><span id="line-148"> * format.</span>
<span class="source-line-no">149</span><span id="line-149"> * @return short value at offset</span>
<span class="source-line-no">150</span><span id="line-150"> */</span>
<span class="source-line-no">151</span><span id="line-151"> public static short toShort(ByteBuffer buf, int offset) {</span>
<span class="source-line-no">152</span><span id="line-152"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">153</span><span id="line-153"> return Short.reverseBytes(getAsShort(buf, offset));</span>
<span class="source-line-no">154</span><span id="line-154"> }</span>
<span class="source-line-no">155</span><span id="line-155"> return getAsShort(buf, offset);</span>
<span class="source-line-no">156</span><span id="line-156"> }</span>
<span class="source-line-no">157</span><span id="line-157"></span>
<span class="source-line-no">158</span><span id="line-158"> /**</span>
<span class="source-line-no">159</span><span id="line-159"> * Reads a short value at the given Object's offset considering it was written in big-endian</span>
<span class="source-line-no">160</span><span id="line-160"> * format.</span>
<span class="source-line-no">161</span><span id="line-161"> * @return short value at offset</span>
<span class="source-line-no">162</span><span id="line-162"> */</span>
<span class="source-line-no">163</span><span id="line-163"> public static short toShort(Object ref, long offset) {</span>
<span class="source-line-no">164</span><span id="line-164"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">165</span><span id="line-165"> return Short.reverseBytes(HBasePlatformDependent.getShort(ref, offset));</span>
<span class="source-line-no">166</span><span id="line-166"> }</span>
<span class="source-line-no">167</span><span id="line-167"> return HBasePlatformDependent.getShort(ref, offset);</span>
<span class="source-line-no">168</span><span id="line-168"> }</span>
<span class="source-line-no">169</span><span id="line-169"></span>
<span class="source-line-no">170</span><span id="line-170"> /**</span>
<span class="source-line-no">171</span><span id="line-171"> * Reads bytes at the given offset as a short value.</span>
<span class="source-line-no">172</span><span id="line-172"> * @return short value at offset</span>
<span class="source-line-no">173</span><span id="line-173"> */</span>
<span class="source-line-no">174</span><span id="line-174"> private static short getAsShort(ByteBuffer buf, int offset) {</span>
<span class="source-line-no">175</span><span id="line-175"> if (buf.isDirect()) {</span>
<span class="source-line-no">176</span><span id="line-176"> return HBasePlatformDependent.getShort(directBufferAddress(buf) + offset);</span>
<span class="source-line-no">177</span><span id="line-177"> }</span>
<span class="source-line-no">178</span><span id="line-178"> return HBasePlatformDependent.getShort(buf.array(),</span>
<span class="source-line-no">179</span><span id="line-179"> BYTE_ARRAY_BASE_OFFSET + buf.arrayOffset() + offset);</span>
<span class="source-line-no">180</span><span id="line-180"> }</span>
<span class="source-line-no">181</span><span id="line-181"></span>
<span class="source-line-no">182</span><span id="line-182"> /**</span>
<span class="source-line-no">183</span><span id="line-183"> * Reads an int value at the given buffer's offset considering it was written in big-endian</span>
<span class="source-line-no">184</span><span id="line-184"> * format.</span>
<span class="source-line-no">185</span><span id="line-185"> * @return int value at offset</span>
<span class="source-line-no">186</span><span id="line-186"> */</span>
<span class="source-line-no">187</span><span id="line-187"> public static int toInt(ByteBuffer buf, int offset) {</span>
<span class="source-line-no">188</span><span id="line-188"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">189</span><span id="line-189"> return Integer.reverseBytes(getAsInt(buf, offset));</span>
<span class="source-line-no">190</span><span id="line-190"> }</span>
<span class="source-line-no">191</span><span id="line-191"> return getAsInt(buf, offset);</span>
<span class="source-line-no">192</span><span id="line-192"> }</span>
<span class="source-line-no">193</span><span id="line-193"></span>
<span class="source-line-no">194</span><span id="line-194"> /**</span>
<span class="source-line-no">195</span><span id="line-195"> * Reads a int value at the given Object's offset considering it was written in big-endian format.</span>
<span class="source-line-no">196</span><span id="line-196"> * @return int value at offset</span>
<span class="source-line-no">197</span><span id="line-197"> */</span>
<span class="source-line-no">198</span><span id="line-198"> public static int toInt(Object ref, long offset) {</span>
<span class="source-line-no">199</span><span id="line-199"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">200</span><span id="line-200"> return Integer.reverseBytes(HBasePlatformDependent.getInt(ref, offset));</span>
<span class="source-line-no">201</span><span id="line-201"> }</span>
<span class="source-line-no">202</span><span id="line-202"> return HBasePlatformDependent.getInt(ref, offset);</span>
<span class="source-line-no">203</span><span id="line-203"> }</span>
<span class="source-line-no">204</span><span id="line-204"></span>
<span class="source-line-no">205</span><span id="line-205"> /**</span>
<span class="source-line-no">206</span><span id="line-206"> * Reads bytes at the given offset as an int value.</span>
<span class="source-line-no">207</span><span id="line-207"> * @return int value at offset</span>
<span class="source-line-no">208</span><span id="line-208"> */</span>
<span class="source-line-no">209</span><span id="line-209"> private static int getAsInt(ByteBuffer buf, int offset) {</span>
<span class="source-line-no">210</span><span id="line-210"> if (buf.isDirect()) {</span>
<span class="source-line-no">211</span><span id="line-211"> return HBasePlatformDependent.getInt(directBufferAddress(buf) + offset);</span>
<span class="source-line-no">212</span><span id="line-212"> }</span>
<span class="source-line-no">213</span><span id="line-213"> return HBasePlatformDependent.getInt(buf.array(),</span>
<span class="source-line-no">214</span><span id="line-214"> BYTE_ARRAY_BASE_OFFSET + buf.arrayOffset() + offset);</span>
<span class="source-line-no">215</span><span id="line-215"> }</span>
<span class="source-line-no">216</span><span id="line-216"></span>
<span class="source-line-no">217</span><span id="line-217"> /**</span>
<span class="source-line-no">218</span><span id="line-218"> * Reads a long value at the given buffer's offset considering it was written in big-endian</span>
<span class="source-line-no">219</span><span id="line-219"> * format.</span>
<span class="source-line-no">220</span><span id="line-220"> * @return long value at offset</span>
<span class="source-line-no">221</span><span id="line-221"> */</span>
<span class="source-line-no">222</span><span id="line-222"> public static long toLong(ByteBuffer buf, int offset) {</span>
<span class="source-line-no">223</span><span id="line-223"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">224</span><span id="line-224"> return Long.reverseBytes(getAsLong(buf, offset));</span>
<span class="source-line-no">225</span><span id="line-225"> }</span>
<span class="source-line-no">226</span><span id="line-226"> return getAsLong(buf, offset);</span>
<span class="source-line-no">227</span><span id="line-227"> }</span>
<span class="source-line-no">228</span><span id="line-228"></span>
<span class="source-line-no">229</span><span id="line-229"> /**</span>
<span class="source-line-no">230</span><span id="line-230"> * Reads a long value at the given Object's offset considering it was written in big-endian</span>
<span class="source-line-no">231</span><span id="line-231"> * format.</span>
<span class="source-line-no">232</span><span id="line-232"> * @return long value at offset</span>
<span class="source-line-no">233</span><span id="line-233"> */</span>
<span class="source-line-no">234</span><span id="line-234"> public static long toLong(Object ref, long offset) {</span>
<span class="source-line-no">235</span><span id="line-235"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">236</span><span id="line-236"> return Long.reverseBytes(HBasePlatformDependent.getLong(ref, offset));</span>
<span class="source-line-no">237</span><span id="line-237"> }</span>
<span class="source-line-no">238</span><span id="line-238"> return HBasePlatformDependent.getLong(ref, offset);</span>
<span class="source-line-no">239</span><span id="line-239"> }</span>
<span class="source-line-no">240</span><span id="line-240"></span>
<span class="source-line-no">241</span><span id="line-241"> /**</span>
<span class="source-line-no">242</span><span id="line-242"> * Reads bytes at the given offset as a long value.</span>
<span class="source-line-no">243</span><span id="line-243"> * @return long value at offset</span>
<span class="source-line-no">244</span><span id="line-244"> */</span>
<span class="source-line-no">245</span><span id="line-245"> private static long getAsLong(ByteBuffer buf, int offset) {</span>
<span class="source-line-no">246</span><span id="line-246"> if (buf.isDirect()) {</span>
<span class="source-line-no">247</span><span id="line-247"> return HBasePlatformDependent.getLong(directBufferAddress(buf) + offset);</span>
<span class="source-line-no">248</span><span id="line-248"> }</span>
<span class="source-line-no">249</span><span id="line-249"> return HBasePlatformDependent.getLong(buf.array(),</span>
<span class="source-line-no">250</span><span id="line-250"> BYTE_ARRAY_BASE_OFFSET + buf.arrayOffset() + offset);</span>
<span class="source-line-no">251</span><span id="line-251"> }</span>
<span class="source-line-no">252</span><span id="line-252"></span>
<span class="source-line-no">253</span><span id="line-253"> /**</span>
<span class="source-line-no">254</span><span id="line-254"> * Returns the byte at the given offset</span>
<span class="source-line-no">255</span><span id="line-255"> * @param buf the buffer to read</span>
<span class="source-line-no">256</span><span id="line-256"> * @param offset the offset at which the byte has to be read</span>
<span class="source-line-no">257</span><span id="line-257"> * @return the byte at the given offset</span>
<span class="source-line-no">258</span><span id="line-258"> */</span>
<span class="source-line-no">259</span><span id="line-259"> public static byte toByte(ByteBuffer buf, int offset) {</span>
<span class="source-line-no">260</span><span id="line-260"> if (buf.isDirect()) {</span>
<span class="source-line-no">261</span><span id="line-261"> return HBasePlatformDependent.getByte(directBufferAddress(buf) + offset);</span>
<span class="source-line-no">262</span><span id="line-262"> } else {</span>
<span class="source-line-no">263</span><span id="line-263"> return HBasePlatformDependent.getByte(buf.array(),</span>
<span class="source-line-no">264</span><span id="line-264"> BYTE_ARRAY_BASE_OFFSET + buf.arrayOffset() + offset);</span>
<span class="source-line-no">265</span><span id="line-265"> }</span>
<span class="source-line-no">266</span><span id="line-266"> }</span>
<span class="source-line-no">267</span><span id="line-267"></span>
<span class="source-line-no">268</span><span id="line-268"> /**</span>
<span class="source-line-no">269</span><span id="line-269"> * Returns the byte at the given offset of the object</span>
<span class="source-line-no">270</span><span id="line-270"> * @return the byte at the given offset</span>
<span class="source-line-no">271</span><span id="line-271"> */</span>
<span class="source-line-no">272</span><span id="line-272"> public static byte toByte(Object ref, long offset) {</span>
<span class="source-line-no">273</span><span id="line-273"> return HBasePlatformDependent.getByte(ref, offset);</span>
<span class="source-line-no">274</span><span id="line-274"> }</span>
<span class="source-line-no">275</span><span id="line-275"></span>
<span class="source-line-no">276</span><span id="line-276"> /**</span>
<span class="source-line-no">277</span><span id="line-277"> * Put an int value out to the specified ByteBuffer offset in big-endian format.</span>
<span class="source-line-no">278</span><span id="line-278"> * @param buf the ByteBuffer to write to</span>
<span class="source-line-no">279</span><span id="line-279"> * @param offset offset in the ByteBuffer</span>
<span class="source-line-no">280</span><span id="line-280"> * @param val int to write out</span>
<span class="source-line-no">281</span><span id="line-281"> * @return incremented offset</span>
<span class="source-line-no">282</span><span id="line-282"> */</span>
<span class="source-line-no">283</span><span id="line-283"> public static int putInt(ByteBuffer buf, int offset, int val) {</span>
<span class="source-line-no">284</span><span id="line-284"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">285</span><span id="line-285"> val = Integer.reverseBytes(val);</span>
<span class="source-line-no">286</span><span id="line-286"> }</span>
<span class="source-line-no">287</span><span id="line-287"> if (buf.isDirect()) {</span>
<span class="source-line-no">288</span><span id="line-288"> HBasePlatformDependent.putInt(directBufferAddress(buf) + offset, val);</span>
<span class="source-line-no">289</span><span id="line-289"> } else {</span>
<span class="source-line-no">290</span><span id="line-290"> HBasePlatformDependent.putInt(buf.array(),</span>
<span class="source-line-no">291</span><span id="line-291"> offset + buf.arrayOffset() + BYTE_ARRAY_BASE_OFFSET, val);</span>
<span class="source-line-no">292</span><span id="line-292"> }</span>
<span class="source-line-no">293</span><span id="line-293"> return offset + Bytes.SIZEOF_INT;</span>
<span class="source-line-no">294</span><span id="line-294"> }</span>
<span class="source-line-no">295</span><span id="line-295"></span>
<span class="source-line-no">296</span><span id="line-296"> // APIs to copy data. This will be direct memory location copy and will be much faster</span>
<span class="source-line-no">297</span><span id="line-297"> /**</span>
<span class="source-line-no">298</span><span id="line-298"> * Copies the bytes from given array's offset to length part into the given buffer.</span>
<span class="source-line-no">299</span><span id="line-299"> * @param src source array</span>
<span class="source-line-no">300</span><span id="line-300"> * @param srcOffset offset into source buffer</span>
<span class="source-line-no">301</span><span id="line-301"> * @param dest destination buffer</span>
<span class="source-line-no">302</span><span id="line-302"> * @param destOffset offset into destination buffer</span>
<span class="source-line-no">303</span><span id="line-303"> * @param length length of data to copy</span>
<span class="source-line-no">304</span><span id="line-304"> */</span>
<span class="source-line-no">305</span><span id="line-305"> public static void copy(byte[] src, int srcOffset, ByteBuffer dest, int destOffset, int length) {</span>
<span class="source-line-no">306</span><span id="line-306"> long destAddress = destOffset;</span>
<span class="source-line-no">307</span><span id="line-307"> Object destBase = null;</span>
<span class="source-line-no">308</span><span id="line-308"> if (dest.isDirect()) {</span>
<span class="source-line-no">309</span><span id="line-309"> destAddress = destAddress + directBufferAddress(dest);</span>
<span class="source-line-no">310</span><span id="line-310"> } else {</span>
<span class="source-line-no">311</span><span id="line-311"> destAddress = destAddress + BYTE_ARRAY_BASE_OFFSET + dest.arrayOffset();</span>
<span class="source-line-no">312</span><span id="line-312"> destBase = dest.array();</span>
<span class="source-line-no">313</span><span id="line-313"> }</span>
<span class="source-line-no">314</span><span id="line-314"> long srcAddress = srcOffset + BYTE_ARRAY_BASE_OFFSET;</span>
<span class="source-line-no">315</span><span id="line-315"> unsafeCopy(src, srcAddress, destBase, destAddress, length);</span>
<span class="source-line-no">316</span><span id="line-316"> }</span>
<span class="source-line-no">317</span><span id="line-317"></span>
<span class="source-line-no">318</span><span id="line-318"> private static void unsafeCopy(Object src, long srcAddr, Object dst, long destAddr, long len) {</span>
<span class="source-line-no">319</span><span id="line-319"> while (len &gt; 0) {</span>
<span class="source-line-no">320</span><span id="line-320"> long size = (len &gt; UNSAFE_COPY_THRESHOLD) ? UNSAFE_COPY_THRESHOLD : len;</span>
<span class="source-line-no">321</span><span id="line-321"> HBasePlatformDependent.copyMemory(src, srcAddr, dst, destAddr, size);</span>
<span class="source-line-no">322</span><span id="line-322"> len -= size;</span>
<span class="source-line-no">323</span><span id="line-323"> srcAddr += size;</span>
<span class="source-line-no">324</span><span id="line-324"> destAddr += size;</span>
<span class="source-line-no">325</span><span id="line-325"> }</span>
<span class="source-line-no">326</span><span id="line-326"> }</span>
<span class="source-line-no">327</span><span id="line-327"></span>
<span class="source-line-no">328</span><span id="line-328"> /**</span>
<span class="source-line-no">329</span><span id="line-329"> * Copies specified number of bytes from given offset of {@code src} ByteBuffer to the</span>
<span class="source-line-no">330</span><span id="line-330"> * {@code dest} array.</span>
<span class="source-line-no">331</span><span id="line-331"> * @param src source buffer</span>
<span class="source-line-no">332</span><span id="line-332"> * @param srcOffset offset into source buffer</span>
<span class="source-line-no">333</span><span id="line-333"> * @param dest destination array</span>
<span class="source-line-no">334</span><span id="line-334"> * @param destOffset offset into destination buffer</span>
<span class="source-line-no">335</span><span id="line-335"> * @param length length of data to copy</span>
<span class="source-line-no">336</span><span id="line-336"> */</span>
<span class="source-line-no">337</span><span id="line-337"> public static void copy(ByteBuffer src, int srcOffset, byte[] dest, int destOffset, int length) {</span>
<span class="source-line-no">338</span><span id="line-338"> long srcAddress = srcOffset;</span>
<span class="source-line-no">339</span><span id="line-339"> Object srcBase = null;</span>
<span class="source-line-no">340</span><span id="line-340"> if (src.isDirect()) {</span>
<span class="source-line-no">341</span><span id="line-341"> srcAddress = srcAddress + directBufferAddress(src);</span>
<span class="source-line-no">342</span><span id="line-342"> } else {</span>
<span class="source-line-no">343</span><span id="line-343"> srcAddress = srcAddress + BYTE_ARRAY_BASE_OFFSET + src.arrayOffset();</span>
<span class="source-line-no">344</span><span id="line-344"> srcBase = src.array();</span>
<span class="source-line-no">345</span><span id="line-345"> }</span>
<span class="source-line-no">346</span><span id="line-346"> long destAddress = destOffset + BYTE_ARRAY_BASE_OFFSET;</span>
<span class="source-line-no">347</span><span id="line-347"> unsafeCopy(srcBase, srcAddress, dest, destAddress, length);</span>
<span class="source-line-no">348</span><span id="line-348"> }</span>
<span class="source-line-no">349</span><span id="line-349"></span>
<span class="source-line-no">350</span><span id="line-350"> /**</span>
<span class="source-line-no">351</span><span id="line-351"> * Copies specified number of bytes from given offset of {@code src} buffer into the {@code dest}</span>
<span class="source-line-no">352</span><span id="line-352"> * buffer.</span>
<span class="source-line-no">353</span><span id="line-353"> * @param src source buffer</span>
<span class="source-line-no">354</span><span id="line-354"> * @param srcOffset offset into source buffer</span>
<span class="source-line-no">355</span><span id="line-355"> * @param dest destination buffer</span>
<span class="source-line-no">356</span><span id="line-356"> * @param destOffset offset into destination buffer</span>
<span class="source-line-no">357</span><span id="line-357"> * @param length length of data to copy</span>
<span class="source-line-no">358</span><span id="line-358"> */</span>
<span class="source-line-no">359</span><span id="line-359"> public static void copy(ByteBuffer src, int srcOffset, ByteBuffer dest, int destOffset,</span>
<span class="source-line-no">360</span><span id="line-360"> int length) {</span>
<span class="source-line-no">361</span><span id="line-361"> long srcAddress, destAddress;</span>
<span class="source-line-no">362</span><span id="line-362"> Object srcBase = null, destBase = null;</span>
<span class="source-line-no">363</span><span id="line-363"> if (src.isDirect()) {</span>
<span class="source-line-no">364</span><span id="line-364"> srcAddress = srcOffset + directBufferAddress(src);</span>
<span class="source-line-no">365</span><span id="line-365"> } else {</span>
<span class="source-line-no">366</span><span id="line-366"> srcAddress = (long) srcOffset + src.arrayOffset() + BYTE_ARRAY_BASE_OFFSET;</span>
<span class="source-line-no">367</span><span id="line-367"> srcBase = src.array();</span>
<span class="source-line-no">368</span><span id="line-368"> }</span>
<span class="source-line-no">369</span><span id="line-369"> if (dest.isDirect()) {</span>
<span class="source-line-no">370</span><span id="line-370"> destAddress = destOffset + directBufferAddress(dest);</span>
<span class="source-line-no">371</span><span id="line-371"> } else {</span>
<span class="source-line-no">372</span><span id="line-372"> destAddress = destOffset + BYTE_ARRAY_BASE_OFFSET + dest.arrayOffset();</span>
<span class="source-line-no">373</span><span id="line-373"> destBase = dest.array();</span>
<span class="source-line-no">374</span><span id="line-374"> }</span>
<span class="source-line-no">375</span><span id="line-375"> unsafeCopy(srcBase, srcAddress, destBase, destAddress, length);</span>
<span class="source-line-no">376</span><span id="line-376"> }</span>
<span class="source-line-no">377</span><span id="line-377"></span>
<span class="source-line-no">378</span><span id="line-378"> // APIs to add primitives to BBs</span>
<span class="source-line-no">379</span><span id="line-379"> /**</span>
<span class="source-line-no">380</span><span id="line-380"> * Put a short value out to the specified BB position in big-endian format.</span>
<span class="source-line-no">381</span><span id="line-381"> * @param buf the byte buffer</span>
<span class="source-line-no">382</span><span id="line-382"> * @param offset position in the buffer</span>
<span class="source-line-no">383</span><span id="line-383"> * @param val short to write out</span>
<span class="source-line-no">384</span><span id="line-384"> * @return incremented offset</span>
<span class="source-line-no">385</span><span id="line-385"> */</span>
<span class="source-line-no">386</span><span id="line-386"> public static int putShort(ByteBuffer buf, int offset, short val) {</span>
<span class="source-line-no">387</span><span id="line-387"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">388</span><span id="line-388"> val = Short.reverseBytes(val);</span>
<span class="source-line-no">389</span><span id="line-389"> }</span>
<span class="source-line-no">390</span><span id="line-390"> if (buf.isDirect()) {</span>
<span class="source-line-no">391</span><span id="line-391"> HBasePlatformDependent.putShort(directBufferAddress(buf) + offset, val);</span>
<span class="source-line-no">392</span><span id="line-392"> } else {</span>
<span class="source-line-no">393</span><span id="line-393"> HBasePlatformDependent.putShort(buf.array(),</span>
<span class="source-line-no">394</span><span id="line-394"> BYTE_ARRAY_BASE_OFFSET + buf.arrayOffset() + offset, val);</span>
<span class="source-line-no">395</span><span id="line-395"> }</span>
<span class="source-line-no">396</span><span id="line-396"> return offset + Bytes.SIZEOF_SHORT;</span>
<span class="source-line-no">397</span><span id="line-397"> }</span>
<span class="source-line-no">398</span><span id="line-398"></span>
<span class="source-line-no">399</span><span id="line-399"> /**</span>
<span class="source-line-no">400</span><span id="line-400"> * Put a long value out to the specified BB position in big-endian format.</span>
<span class="source-line-no">401</span><span id="line-401"> * @param buf the byte buffer</span>
<span class="source-line-no">402</span><span id="line-402"> * @param offset position in the buffer</span>
<span class="source-line-no">403</span><span id="line-403"> * @param val long to write out</span>
<span class="source-line-no">404</span><span id="line-404"> * @return incremented offset</span>
<span class="source-line-no">405</span><span id="line-405"> */</span>
<span class="source-line-no">406</span><span id="line-406"> public static int putLong(ByteBuffer buf, int offset, long val) {</span>
<span class="source-line-no">407</span><span id="line-407"> if (LITTLE_ENDIAN) {</span>
<span class="source-line-no">408</span><span id="line-408"> val = Long.reverseBytes(val);</span>
<span class="source-line-no">409</span><span id="line-409"> }</span>
<span class="source-line-no">410</span><span id="line-410"> if (buf.isDirect()) {</span>
<span class="source-line-no">411</span><span id="line-411"> HBasePlatformDependent.putLong(directBufferAddress(buf) + offset, val);</span>
<span class="source-line-no">412</span><span id="line-412"> } else {</span>
<span class="source-line-no">413</span><span id="line-413"> HBasePlatformDependent.putLong(buf.array(),</span>
<span class="source-line-no">414</span><span id="line-414"> BYTE_ARRAY_BASE_OFFSET + buf.arrayOffset() + offset, val);</span>
<span class="source-line-no">415</span><span id="line-415"> }</span>
<span class="source-line-no">416</span><span id="line-416"> return offset + Bytes.SIZEOF_LONG;</span>
<span class="source-line-no">417</span><span id="line-417"> }</span>
<span class="source-line-no">418</span><span id="line-418"></span>
<span class="source-line-no">419</span><span id="line-419"> /**</span>
<span class="source-line-no">420</span><span id="line-420"> * Put a byte value out to the specified BB position in big-endian format.</span>
<span class="source-line-no">421</span><span id="line-421"> * @param buf the byte buffer</span>
<span class="source-line-no">422</span><span id="line-422"> * @param offset position in the buffer</span>
<span class="source-line-no">423</span><span id="line-423"> * @param b byte to write out</span>
<span class="source-line-no">424</span><span id="line-424"> * @return incremented offset</span>
<span class="source-line-no">425</span><span id="line-425"> */</span>
<span class="source-line-no">426</span><span id="line-426"> public static int putByte(ByteBuffer buf, int offset, byte b) {</span>
<span class="source-line-no">427</span><span id="line-427"> if (buf.isDirect()) {</span>
<span class="source-line-no">428</span><span id="line-428"> HBasePlatformDependent.putByte(directBufferAddress(buf) + offset, b);</span>
<span class="source-line-no">429</span><span id="line-429"> } else {</span>
<span class="source-line-no">430</span><span id="line-430"> HBasePlatformDependent.putByte(buf.array(),</span>
<span class="source-line-no">431</span><span id="line-431"> BYTE_ARRAY_BASE_OFFSET + buf.arrayOffset() + offset, b);</span>
<span class="source-line-no">432</span><span id="line-432"> }</span>
<span class="source-line-no">433</span><span id="line-433"> return offset + 1;</span>
<span class="source-line-no">434</span><span id="line-434"> }</span>
<span class="source-line-no">435</span><span id="line-435"></span>
<span class="source-line-no">436</span><span id="line-436"> public static long directBufferAddress(ByteBuffer buf) {</span>
<span class="source-line-no">437</span><span id="line-437"> return PlatformDependent.directBufferAddress(buf);</span>
<span class="source-line-no">438</span><span id="line-438"> }</span>
<span class="source-line-no">439</span><span id="line-439"></span>
<span class="source-line-no">440</span><span id="line-440"> public static void freeDirectBuffer(ByteBuffer buffer) {</span>
<span class="source-line-no">441</span><span id="line-441"> // here we just use the method in netty</span>
<span class="source-line-no">442</span><span id="line-442"> PlatformDependent.freeDirectBuffer(buffer);</span>
<span class="source-line-no">443</span><span id="line-443"> }</span>
<span class="source-line-no">444</span><span id="line-444">}</span>
</pre>
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