Repository: hbase-site Updated Branches: refs/heads/asf-site 419fe0731 -> 9eba7fcf3
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/9eba7fcf/devapidocs/src-html/org/apache/hadoop/hbase/util/ByteBufferArray.BufferCreatorCallable.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/util/ByteBufferArray.BufferCreatorCallable.html b/devapidocs/src-html/org/apache/hadoop/hbase/util/ByteBufferArray.BufferCreatorCallable.html new file mode 100644 index 0000000..7a442f0 --- /dev/null +++ b/devapidocs/src-html/org/apache/hadoop/hbase/util/ByteBufferArray.BufferCreatorCallable.html @@ -0,0 +1,390 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd";> +<html lang="en"> +<head> +<title>Source code</title> +<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> +</head> +<body> +<div class="sourceContainer"> +<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> +<span class="sourceLineNo">002</span> * Copyright The Apache Software Foundation<a name="line.2"></a> +<span class="sourceLineNo">003</span> *<a name="line.3"></a> +<span class="sourceLineNo">004</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.4"></a> +<span class="sourceLineNo">005</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.5"></a> +<span class="sourceLineNo">006</span> * work for additional information regarding copyright ownership. The ASF<a name="line.6"></a> +<span class="sourceLineNo">007</span> * licenses this file to you under the Apache License, Version 2.0 (the<a name="line.7"></a> +<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance with the License.<a name="line.8"></a> +<span class="sourceLineNo">009</span> * You may obtain a copy of the License at<a name="line.9"></a> +<span class="sourceLineNo">010</span> *<a name="line.10"></a> +<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> +<span class="sourceLineNo">012</span> *<a name="line.12"></a> +<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> +<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT<a name="line.14"></a> +<span class="sourceLineNo">015</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.15"></a> +<span class="sourceLineNo">016</span> * License for the specific language governing permissions and limitations<a name="line.16"></a> +<span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a> +<span class="sourceLineNo">018</span> */<a name="line.18"></a> +<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.util;<a name="line.19"></a> +<span class="sourceLineNo">020</span><a name="line.20"></a> +<span class="sourceLineNo">021</span>import java.io.IOException;<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.util.concurrent.Callable;<a name="line.23"></a> +<span class="sourceLineNo">024</span>import java.util.concurrent.ExecutionException;<a name="line.24"></a> +<span class="sourceLineNo">025</span>import java.util.concurrent.ExecutorService;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import java.util.concurrent.Future;<a name="line.26"></a> +<span class="sourceLineNo">027</span>import java.util.concurrent.LinkedBlockingQueue;<a name="line.27"></a> +<span class="sourceLineNo">028</span>import java.util.concurrent.ThreadPoolExecutor;<a name="line.28"></a> +<span class="sourceLineNo">029</span>import java.util.concurrent.TimeUnit;<a name="line.29"></a> +<span class="sourceLineNo">030</span><a name="line.30"></a> +<span class="sourceLineNo">031</span>import org.apache.commons.logging.Log;<a name="line.31"></a> +<span class="sourceLineNo">032</span>import org.apache.commons.logging.LogFactory;<a name="line.32"></a> +<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.33"></a> +<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.nio.MultiByteBuff;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import org.apache.hadoop.util.StringUtils;<a name="line.37"></a> +<span class="sourceLineNo">038</span><a name="line.38"></a> +<span class="sourceLineNo">039</span>import com.google.common.annotations.VisibleForTesting;<a name="line.39"></a> +<span class="sourceLineNo">040</span><a name="line.40"></a> +<span class="sourceLineNo">041</span>/**<a name="line.41"></a> +<span class="sourceLineNo">042</span> * This class manages an array of ByteBuffers with a default size 4MB. These<a name="line.42"></a> +<span class="sourceLineNo">043</span> * buffers are sequential and could be considered as a large buffer.It supports<a name="line.43"></a> +<span class="sourceLineNo">044</span> * reading/writing data from this large buffer with a position and offset<a name="line.44"></a> +<span class="sourceLineNo">045</span> */<a name="line.45"></a> +<span class="sourceLineNo">046</span>@InterfaceAudience.Private<a name="line.46"></a> +<span class="sourceLineNo">047</span>public final class ByteBufferArray {<a name="line.47"></a> +<span class="sourceLineNo">048</span> private static final Log LOG = LogFactory.getLog(ByteBufferArray.class);<a name="line.48"></a> +<span class="sourceLineNo">049</span><a name="line.49"></a> +<span class="sourceLineNo">050</span> public static final int DEFAULT_BUFFER_SIZE = 4 * 1024 * 1024;<a name="line.50"></a> +<span class="sourceLineNo">051</span> @VisibleForTesting<a name="line.51"></a> +<span class="sourceLineNo">052</span> ByteBuffer buffers[];<a name="line.52"></a> +<span class="sourceLineNo">053</span> private int bufferSize;<a name="line.53"></a> +<span class="sourceLineNo">054</span> private int bufferCount;<a name="line.54"></a> +<span class="sourceLineNo">055</span><a name="line.55"></a> +<span class="sourceLineNo">056</span> /**<a name="line.56"></a> +<span class="sourceLineNo">057</span> * We allocate a number of byte buffers as the capacity. In order not to out<a name="line.57"></a> +<span class="sourceLineNo">058</span> * of the array bounds for the last byte(see {@link ByteBufferArray#multiple}),<a name="line.58"></a> +<span class="sourceLineNo">059</span> * we will allocate one additional buffer with capacity 0;<a name="line.59"></a> +<span class="sourceLineNo">060</span> * @param capacity total size of the byte buffer array<a name="line.60"></a> +<span class="sourceLineNo">061</span> * @param directByteBuffer true if we allocate direct buffer<a name="line.61"></a> +<span class="sourceLineNo">062</span> * @param allocator the ByteBufferAllocator that will create the buffers<a name="line.62"></a> +<span class="sourceLineNo">063</span> * @throws IOException throws IOException if there is an exception thrown by the allocator<a name="line.63"></a> +<span class="sourceLineNo">064</span> */<a name="line.64"></a> +<span class="sourceLineNo">065</span> public ByteBufferArray(long capacity, boolean directByteBuffer, ByteBufferAllocator allocator)<a name="line.65"></a> +<span class="sourceLineNo">066</span> throws IOException {<a name="line.66"></a> +<span class="sourceLineNo">067</span> this.bufferSize = DEFAULT_BUFFER_SIZE;<a name="line.67"></a> +<span class="sourceLineNo">068</span> if (this.bufferSize > (capacity / 16))<a name="line.68"></a> +<span class="sourceLineNo">069</span> this.bufferSize = (int) roundUp(capacity / 16, 32768);<a name="line.69"></a> +<span class="sourceLineNo">070</span> this.bufferCount = (int) (roundUp(capacity, bufferSize) / bufferSize);<a name="line.70"></a> +<span class="sourceLineNo">071</span> LOG.info("Allocating buffers total=" + StringUtils.byteDesc(capacity)<a name="line.71"></a> +<span class="sourceLineNo">072</span> + ", sizePerBuffer=" + StringUtils.byteDesc(bufferSize) + ", count="<a name="line.72"></a> +<span class="sourceLineNo">073</span> + bufferCount + ", direct=" + directByteBuffer);<a name="line.73"></a> +<span class="sourceLineNo">074</span> buffers = new ByteBuffer[bufferCount + 1];<a name="line.74"></a> +<span class="sourceLineNo">075</span> createBuffers(directByteBuffer, allocator);<a name="line.75"></a> +<span class="sourceLineNo">076</span> }<a name="line.76"></a> +<span class="sourceLineNo">077</span><a name="line.77"></a> +<span class="sourceLineNo">078</span> private void createBuffers(boolean directByteBuffer, ByteBufferAllocator allocator)<a name="line.78"></a> +<span class="sourceLineNo">079</span> throws IOException {<a name="line.79"></a> +<span class="sourceLineNo">080</span> int threadCount = Runtime.getRuntime().availableProcessors();<a name="line.80"></a> +<span class="sourceLineNo">081</span> ExecutorService service = new ThreadPoolExecutor(threadCount, threadCount, 0L,<a name="line.81"></a> +<span class="sourceLineNo">082</span> TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>());<a name="line.82"></a> +<span class="sourceLineNo">083</span> int perThreadCount = Math.round((float) (bufferCount) / threadCount);<a name="line.83"></a> +<span class="sourceLineNo">084</span> int lastThreadCount = bufferCount - (perThreadCount * (threadCount - 1));<a name="line.84"></a> +<span class="sourceLineNo">085</span> Future<ByteBuffer[]>[] futures = new Future[threadCount];<a name="line.85"></a> +<span class="sourceLineNo">086</span> try {<a name="line.86"></a> +<span class="sourceLineNo">087</span> for (int i = 0; i < threadCount; i++) {<a name="line.87"></a> +<span class="sourceLineNo">088</span> // Last thread will have to deal with a different number of buffers<a name="line.88"></a> +<span class="sourceLineNo">089</span> int buffersToCreate = (i == threadCount - 1) ? lastThreadCount : perThreadCount;<a name="line.89"></a> +<span class="sourceLineNo">090</span> futures[i] = service.submit(<a name="line.90"></a> +<span class="sourceLineNo">091</span> new BufferCreatorCallable(bufferSize, directByteBuffer, buffersToCreate, allocator));<a name="line.91"></a> +<span class="sourceLineNo">092</span> }<a name="line.92"></a> +<span class="sourceLineNo">093</span> int bufferIndex = 0;<a name="line.93"></a> +<span class="sourceLineNo">094</span> for (Future<ByteBuffer[]> future : futures) {<a name="line.94"></a> +<span class="sourceLineNo">095</span> try {<a name="line.95"></a> +<span class="sourceLineNo">096</span> ByteBuffer[] buffers = future.get();<a name="line.96"></a> +<span class="sourceLineNo">097</span> for (ByteBuffer buffer : buffers) {<a name="line.97"></a> +<span class="sourceLineNo">098</span> this.buffers[bufferIndex++] = buffer;<a name="line.98"></a> +<span class="sourceLineNo">099</span> }<a name="line.99"></a> +<span class="sourceLineNo">100</span> } catch (InterruptedException | ExecutionException e) {<a name="line.100"></a> +<span class="sourceLineNo">101</span> LOG.error("Buffer creation interrupted", e);<a name="line.101"></a> +<span class="sourceLineNo">102</span> throw new IOException(e);<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> } finally {<a name="line.105"></a> +<span class="sourceLineNo">106</span> service.shutdownNow();<a name="line.106"></a> +<span class="sourceLineNo">107</span> }<a name="line.107"></a> +<span class="sourceLineNo">108</span> // always create on heap empty dummy buffer at last<a name="line.108"></a> +<span class="sourceLineNo">109</span> this.buffers[bufferCount] = ByteBuffer.allocate(0);<a name="line.109"></a> +<span class="sourceLineNo">110</span> }<a name="line.110"></a> +<span class="sourceLineNo">111</span><a name="line.111"></a> +<span class="sourceLineNo">112</span> /**<a name="line.112"></a> +<span class="sourceLineNo">113</span> * A callable that creates buffers of the specified length either onheap/offheap using the<a name="line.113"></a> +<span class="sourceLineNo">114</span> * {@link ByteBufferAllocator}<a name="line.114"></a> +<span class="sourceLineNo">115</span> */<a name="line.115"></a> +<span class="sourceLineNo">116</span> private static class BufferCreatorCallable implements Callable<ByteBuffer[]> {<a name="line.116"></a> +<span class="sourceLineNo">117</span> private final int bufferCapacity;<a name="line.117"></a> +<span class="sourceLineNo">118</span> private final boolean directByteBuffer;<a name="line.118"></a> +<span class="sourceLineNo">119</span> private final int bufferCount;<a name="line.119"></a> +<span class="sourceLineNo">120</span> private final ByteBufferAllocator allocator;<a name="line.120"></a> +<span class="sourceLineNo">121</span><a name="line.121"></a> +<span class="sourceLineNo">122</span> BufferCreatorCallable(int bufferCapacity, boolean directByteBuffer, int bufferCount,<a name="line.122"></a> +<span class="sourceLineNo">123</span> ByteBufferAllocator allocator) {<a name="line.123"></a> +<span class="sourceLineNo">124</span> this.bufferCapacity = bufferCapacity;<a name="line.124"></a> +<span class="sourceLineNo">125</span> this.directByteBuffer = directByteBuffer;<a name="line.125"></a> +<span class="sourceLineNo">126</span> this.bufferCount = bufferCount;<a name="line.126"></a> +<span class="sourceLineNo">127</span> this.allocator = allocator;<a name="line.127"></a> +<span class="sourceLineNo">128</span> }<a name="line.128"></a> +<span class="sourceLineNo">129</span><a name="line.129"></a> +<span class="sourceLineNo">130</span> @Override<a name="line.130"></a> +<span class="sourceLineNo">131</span> public ByteBuffer[] call() throws Exception {<a name="line.131"></a> +<span class="sourceLineNo">132</span> ByteBuffer[] buffers = new ByteBuffer[this.bufferCount];<a name="line.132"></a> +<span class="sourceLineNo">133</span> for (int i = 0; i < this.bufferCount; i++) {<a name="line.133"></a> +<span class="sourceLineNo">134</span> buffers[i] = allocator.allocate(this.bufferCapacity, this.directByteBuffer);<a name="line.134"></a> +<span class="sourceLineNo">135</span> }<a name="line.135"></a> +<span class="sourceLineNo">136</span> return buffers;<a name="line.136"></a> +<span class="sourceLineNo">137</span> }<a name="line.137"></a> +<span class="sourceLineNo">138</span> }<a name="line.138"></a> +<span class="sourceLineNo">139</span><a name="line.139"></a> +<span class="sourceLineNo">140</span> private long roundUp(long n, long to) {<a name="line.140"></a> +<span class="sourceLineNo">141</span> return ((n + to - 1) / to) * to;<a name="line.141"></a> +<span class="sourceLineNo">142</span> }<a name="line.142"></a> +<span class="sourceLineNo">143</span><a name="line.143"></a> +<span class="sourceLineNo">144</span> /**<a name="line.144"></a> +<span class="sourceLineNo">145</span> * Transfers bytes from this buffer array into the given destination array<a name="line.145"></a> +<span class="sourceLineNo">146</span> * @param start start position in the ByteBufferArray<a name="line.146"></a> +<span class="sourceLineNo">147</span> * @param len The maximum number of bytes to be written to the given array<a name="line.147"></a> +<span class="sourceLineNo">148</span> * @param dstArray The array into which bytes are to be written<a name="line.148"></a> +<span class="sourceLineNo">149</span> * @return number of bytes read<a name="line.149"></a> +<span class="sourceLineNo">150</span> */<a name="line.150"></a> +<span class="sourceLineNo">151</span> public int getMultiple(long start, int len, byte[] dstArray) {<a name="line.151"></a> +<span class="sourceLineNo">152</span> return getMultiple(start, len, dstArray, 0);<a name="line.152"></a> +<span class="sourceLineNo">153</span> }<a name="line.153"></a> +<span class="sourceLineNo">154</span><a name="line.154"></a> +<span class="sourceLineNo">155</span> /**<a name="line.155"></a> +<span class="sourceLineNo">156</span> * Transfers bytes from this buffer array into the given destination array<a name="line.156"></a> +<span class="sourceLineNo">157</span> * @param start start offset of this buffer array<a name="line.157"></a> +<span class="sourceLineNo">158</span> * @param len The maximum number of bytes to be written to the given array<a name="line.158"></a> +<span class="sourceLineNo">159</span> * @param dstArray The array into which bytes are to be written<a name="line.159"></a> +<span class="sourceLineNo">160</span> * @param dstOffset The offset within the given array of the first byte to be<a name="line.160"></a> +<span class="sourceLineNo">161</span> * written<a name="line.161"></a> +<span class="sourceLineNo">162</span> * @return number of bytes read<a name="line.162"></a> +<span class="sourceLineNo">163</span> */<a name="line.163"></a> +<span class="sourceLineNo">164</span> public int getMultiple(long start, int len, byte[] dstArray, int dstOffset) {<a name="line.164"></a> +<span class="sourceLineNo">165</span> multiple(start, len, dstArray, dstOffset, GET_MULTIPLE_VISTOR);<a name="line.165"></a> +<span class="sourceLineNo">166</span> return len;<a name="line.166"></a> +<span class="sourceLineNo">167</span> }<a name="line.167"></a> +<span class="sourceLineNo">168</span><a name="line.168"></a> +<span class="sourceLineNo">169</span> private final static Visitor GET_MULTIPLE_VISTOR = new Visitor() {<a name="line.169"></a> +<span class="sourceLineNo">170</span> @Override<a name="line.170"></a> +<span class="sourceLineNo">171</span> public void visit(ByteBuffer bb, int pos, byte[] array, int arrayIdx, int len) {<a name="line.171"></a> +<span class="sourceLineNo">172</span> ByteBufferUtils.copyFromBufferToArray(array, bb, pos, arrayIdx, len);<a name="line.172"></a> +<span class="sourceLineNo">173</span> }<a name="line.173"></a> +<span class="sourceLineNo">174</span> };<a name="line.174"></a> +<span class="sourceLineNo">175</span><a name="line.175"></a> +<span class="sourceLineNo">176</span> /**<a name="line.176"></a> +<span class="sourceLineNo">177</span> * Transfers bytes from the given source array into this buffer array<a name="line.177"></a> +<span class="sourceLineNo">178</span> * @param start start offset of this buffer array<a name="line.178"></a> +<span class="sourceLineNo">179</span> * @param len The maximum number of bytes to be read from the given array<a name="line.179"></a> +<span class="sourceLineNo">180</span> * @param srcArray The array from which bytes are to be read<a name="line.180"></a> +<span class="sourceLineNo">181</span> */<a name="line.181"></a> +<span class="sourceLineNo">182</span> public void putMultiple(long start, int len, byte[] srcArray) {<a name="line.182"></a> +<span class="sourceLineNo">183</span> putMultiple(start, len, srcArray, 0);<a name="line.183"></a> +<span class="sourceLineNo">184</span> }<a name="line.184"></a> +<span class="sourceLineNo">185</span><a name="line.185"></a> +<span class="sourceLineNo">186</span> /**<a name="line.186"></a> +<span class="sourceLineNo">187</span> * Transfers bytes from the given source array into this buffer array<a name="line.187"></a> +<span class="sourceLineNo">188</span> * @param start start offset of this buffer array<a name="line.188"></a> +<span class="sourceLineNo">189</span> * @param len The maximum number of bytes to be read from the given array<a name="line.189"></a> +<span class="sourceLineNo">190</span> * @param srcArray The array from which bytes are to be read<a name="line.190"></a> +<span class="sourceLineNo">191</span> * @param srcOffset The offset within the given array of the first byte to be<a name="line.191"></a> +<span class="sourceLineNo">192</span> * read<a name="line.192"></a> +<span class="sourceLineNo">193</span> */<a name="line.193"></a> +<span class="sourceLineNo">194</span> public void putMultiple(long start, int len, byte[] srcArray, int srcOffset) {<a name="line.194"></a> +<span class="sourceLineNo">195</span> multiple(start, len, srcArray, srcOffset, PUT_MULTIPLE_VISITOR);<a name="line.195"></a> +<span class="sourceLineNo">196</span> }<a name="line.196"></a> +<span class="sourceLineNo">197</span><a name="line.197"></a> +<span class="sourceLineNo">198</span> private final static Visitor PUT_MULTIPLE_VISITOR = new Visitor() {<a name="line.198"></a> +<span class="sourceLineNo">199</span> @Override<a name="line.199"></a> +<span class="sourceLineNo">200</span> public void visit(ByteBuffer bb, int pos, byte[] array, int arrayIdx, int len) {<a name="line.200"></a> +<span class="sourceLineNo">201</span> ByteBufferUtils.copyFromArrayToBuffer(bb, pos, array, arrayIdx, len);<a name="line.201"></a> +<span class="sourceLineNo">202</span> }<a name="line.202"></a> +<span class="sourceLineNo">203</span> };<a name="line.203"></a> +<span class="sourceLineNo">204</span><a name="line.204"></a> +<span class="sourceLineNo">205</span> private interface Visitor {<a name="line.205"></a> +<span class="sourceLineNo">206</span> /**<a name="line.206"></a> +<span class="sourceLineNo">207</span> * Visit the given byte buffer, if it is a read action, we will transfer the<a name="line.207"></a> +<span class="sourceLineNo">208</span> * bytes from the buffer to the destination array, else if it is a write<a name="line.208"></a> +<span class="sourceLineNo">209</span> * action, we will transfer the bytes from the source array to the buffer<a name="line.209"></a> +<span class="sourceLineNo">210</span> * @param bb byte buffer<a name="line.210"></a> +<span class="sourceLineNo">211</span> * @param pos Start position in ByteBuffer<a name="line.211"></a> +<span class="sourceLineNo">212</span> * @param array a source or destination byte array<a name="line.212"></a> +<span class="sourceLineNo">213</span> * @param arrayOffset offset of the byte array<a name="line.213"></a> +<span class="sourceLineNo">214</span> * @param len read/write length<a name="line.214"></a> +<span class="sourceLineNo">215</span> */<a name="line.215"></a> +<span class="sourceLineNo">216</span> void visit(ByteBuffer bb, int pos, byte[] array, int arrayOffset, int len);<a name="line.216"></a> +<span class="sourceLineNo">217</span> }<a name="line.217"></a> +<span class="sourceLineNo">218</span><a name="line.218"></a> +<span class="sourceLineNo">219</span> /**<a name="line.219"></a> +<span class="sourceLineNo">220</span> * Access(read or write) this buffer array with a position and length as the<a name="line.220"></a> +<span class="sourceLineNo">221</span> * given array. Here we will only lock one buffer even if it may be need visit<a name="line.221"></a> +<span class="sourceLineNo">222</span> * several buffers. The consistency is guaranteed by the caller.<a name="line.222"></a> +<span class="sourceLineNo">223</span> * @param start start offset of this buffer array<a name="line.223"></a> +<span class="sourceLineNo">224</span> * @param len The maximum number of bytes to be accessed<a name="line.224"></a> +<span class="sourceLineNo">225</span> * @param array The array from/to which bytes are to be read/written<a name="line.225"></a> +<span class="sourceLineNo">226</span> * @param arrayOffset The offset within the given array of the first byte to<a name="line.226"></a> +<span class="sourceLineNo">227</span> * be read or written<a name="line.227"></a> +<span class="sourceLineNo">228</span> * @param visitor implement of how to visit the byte buffer<a name="line.228"></a> +<span class="sourceLineNo">229</span> */<a name="line.229"></a> +<span class="sourceLineNo">230</span> void multiple(long start, int len, byte[] array, int arrayOffset, Visitor visitor) {<a name="line.230"></a> +<span class="sourceLineNo">231</span> assert len >= 0;<a name="line.231"></a> +<span class="sourceLineNo">232</span> long end = start + len;<a name="line.232"></a> +<span class="sourceLineNo">233</span> int startBuffer = (int) (start / bufferSize), startOffset = (int) (start % bufferSize);<a name="line.233"></a> +<span class="sourceLineNo">234</span> int endBuffer = (int) (end / bufferSize), endOffset = (int) (end % bufferSize);<a name="line.234"></a> +<span class="sourceLineNo">235</span> assert array.length >= len + arrayOffset;<a name="line.235"></a> +<span class="sourceLineNo">236</span> assert startBuffer >= 0 && startBuffer < bufferCount;<a name="line.236"></a> +<span class="sourceLineNo">237</span> assert endBuffer >= 0 && endBuffer < bufferCount<a name="line.237"></a> +<span class="sourceLineNo">238</span> || (endBuffer == bufferCount && endOffset == 0);<a name="line.238"></a> +<span class="sourceLineNo">239</span> if (startBuffer >= buffers.length || startBuffer < 0) {<a name="line.239"></a> +<span class="sourceLineNo">240</span> String msg = "Failed multiple, start=" + start + ",startBuffer="<a name="line.240"></a> +<span class="sourceLineNo">241</span> + startBuffer + ",bufferSize=" + bufferSize;<a name="line.241"></a> +<span class="sourceLineNo">242</span> LOG.error(msg);<a name="line.242"></a> +<span class="sourceLineNo">243</span> throw new RuntimeException(msg);<a name="line.243"></a> +<span class="sourceLineNo">244</span> }<a name="line.244"></a> +<span class="sourceLineNo">245</span> int srcIndex = 0, cnt = -1;<a name="line.245"></a> +<span class="sourceLineNo">246</span> for (int i = startBuffer; i <= endBuffer; ++i) {<a name="line.246"></a> +<span class="sourceLineNo">247</span> ByteBuffer bb = buffers[i].duplicate();<a name="line.247"></a> +<span class="sourceLineNo">248</span> int pos = 0;<a name="line.248"></a> +<span class="sourceLineNo">249</span> if (i == startBuffer) {<a name="line.249"></a> +<span class="sourceLineNo">250</span> cnt = bufferSize - startOffset;<a name="line.250"></a> +<span class="sourceLineNo">251</span> if (cnt > len) cnt = len;<a name="line.251"></a> +<span class="sourceLineNo">252</span> pos = startOffset;<a name="line.252"></a> +<span class="sourceLineNo">253</span> } else if (i == endBuffer) {<a name="line.253"></a> +<span class="sourceLineNo">254</span> cnt = endOffset;<a name="line.254"></a> +<span class="sourceLineNo">255</span> } else {<a name="line.255"></a> +<span class="sourceLineNo">256</span> cnt = bufferSize;<a name="line.256"></a> +<span class="sourceLineNo">257</span> }<a name="line.257"></a> +<span class="sourceLineNo">258</span> visitor.visit(bb, pos, array, srcIndex + arrayOffset, cnt);<a name="line.258"></a> +<span class="sourceLineNo">259</span> srcIndex += cnt;<a name="line.259"></a> +<span class="sourceLineNo">260</span> }<a name="line.260"></a> +<span class="sourceLineNo">261</span> assert srcIndex == len;<a name="line.261"></a> +<span class="sourceLineNo">262</span> }<a name="line.262"></a> +<span class="sourceLineNo">263</span><a name="line.263"></a> +<span class="sourceLineNo">264</span> /**<a name="line.264"></a> +<span class="sourceLineNo">265</span> * Creates a ByteBuff from a given array of ByteBuffers from the given offset to the<a name="line.265"></a> +<span class="sourceLineNo">266</span> * length specified. For eg, if there are 4 buffers forming an array each with length 10 and<a name="line.266"></a> +<span class="sourceLineNo">267</span> * if we call asSubBuffer(5, 10) then we will create an MBB consisting of two BBs<a name="line.267"></a> +<span class="sourceLineNo">268</span> * and the first one be a BB from 'position' 5 to a 'length' 5 and the 2nd BB will be from<a name="line.268"></a> +<span class="sourceLineNo">269</span> * 'position' 0 to 'length' 5.<a name="line.269"></a> +<span class="sourceLineNo">270</span> * @param offset<a name="line.270"></a> +<span class="sourceLineNo">271</span> * @param len<a name="line.271"></a> +<span class="sourceLineNo">272</span> * @return a ByteBuff formed from the underlying ByteBuffers<a name="line.272"></a> +<span class="sourceLineNo">273</span> */<a name="line.273"></a> +<span class="sourceLineNo">274</span> public ByteBuff asSubByteBuff(long offset, int len) {<a name="line.274"></a> +<span class="sourceLineNo">275</span> assert len >= 0;<a name="line.275"></a> +<span class="sourceLineNo">276</span> long end = offset + len;<a name="line.276"></a> +<span class="sourceLineNo">277</span> int startBuffer = (int) (offset / bufferSize), startBufferOffset = (int) (offset % bufferSize);<a name="line.277"></a> +<span class="sourceLineNo">278</span> int endBuffer = (int) (end / bufferSize), endBufferOffset = (int) (end % bufferSize);<a name="line.278"></a> +<span class="sourceLineNo">279</span> // Last buffer in the array is a dummy one with 0 capacity. Avoid sending back that<a name="line.279"></a> +<span class="sourceLineNo">280</span> if (endBuffer == this.bufferCount) {<a name="line.280"></a> +<span class="sourceLineNo">281</span> endBuffer--;<a name="line.281"></a> +<span class="sourceLineNo">282</span> endBufferOffset = bufferSize;<a name="line.282"></a> +<span class="sourceLineNo">283</span> }<a name="line.283"></a> +<span class="sourceLineNo">284</span> assert startBuffer >= 0 && startBuffer < bufferCount;<a name="line.284"></a> +<span class="sourceLineNo">285</span> assert endBuffer >= 0 && endBuffer < bufferCount<a name="line.285"></a> +<span class="sourceLineNo">286</span> || (endBuffer == bufferCount && endBufferOffset == 0);<a name="line.286"></a> +<span class="sourceLineNo">287</span> if (startBuffer >= buffers.length || startBuffer < 0) {<a name="line.287"></a> +<span class="sourceLineNo">288</span> String msg = "Failed subArray, start=" + offset + ",startBuffer=" + startBuffer<a name="line.288"></a> +<span class="sourceLineNo">289</span> + ",bufferSize=" + bufferSize;<a name="line.289"></a> +<span class="sourceLineNo">290</span> LOG.error(msg);<a name="line.290"></a> +<span class="sourceLineNo">291</span> throw new RuntimeException(msg);<a name="line.291"></a> +<span class="sourceLineNo">292</span> }<a name="line.292"></a> +<span class="sourceLineNo">293</span> int srcIndex = 0, cnt = -1;<a name="line.293"></a> +<span class="sourceLineNo">294</span> ByteBuffer[] mbb = new ByteBuffer[endBuffer - startBuffer + 1];<a name="line.294"></a> +<span class="sourceLineNo">295</span> for (int i = startBuffer, j = 0; i <= endBuffer; ++i, j++) {<a name="line.295"></a> +<span class="sourceLineNo">296</span> ByteBuffer bb = buffers[i].duplicate();<a name="line.296"></a> +<span class="sourceLineNo">297</span> if (i == startBuffer) {<a name="line.297"></a> +<span class="sourceLineNo">298</span> cnt = bufferSize - startBufferOffset;<a name="line.298"></a> +<span class="sourceLineNo">299</span> if (cnt > len) cnt = len;<a name="line.299"></a> +<span class="sourceLineNo">300</span> bb.limit(startBufferOffset + cnt).position(startBufferOffset);<a name="line.300"></a> +<span class="sourceLineNo">301</span> } else if (i == endBuffer) {<a name="line.301"></a> +<span class="sourceLineNo">302</span> cnt = endBufferOffset;<a name="line.302"></a> +<span class="sourceLineNo">303</span> bb.position(0).limit(cnt);<a name="line.303"></a> +<span class="sourceLineNo">304</span> } else {<a name="line.304"></a> +<span class="sourceLineNo">305</span> cnt = bufferSize;<a name="line.305"></a> +<span class="sourceLineNo">306</span> bb.position(0).limit(cnt);<a name="line.306"></a> +<span class="sourceLineNo">307</span> }<a name="line.307"></a> +<span class="sourceLineNo">308</span> mbb[j] = bb.slice();<a name="line.308"></a> +<span class="sourceLineNo">309</span> srcIndex += cnt;<a name="line.309"></a> +<span class="sourceLineNo">310</span> }<a name="line.310"></a> +<span class="sourceLineNo">311</span> assert srcIndex == len;<a name="line.311"></a> +<span class="sourceLineNo">312</span> if (mbb.length > 1) {<a name="line.312"></a> +<span class="sourceLineNo">313</span> return new MultiByteBuff(mbb);<a name="line.313"></a> +<span class="sourceLineNo">314</span> } else {<a name="line.314"></a> +<span class="sourceLineNo">315</span> return new SingleByteBuff(mbb[0]);<a name="line.315"></a> +<span class="sourceLineNo">316</span> }<a name="line.316"></a> +<span class="sourceLineNo">317</span> }<a name="line.317"></a> +<span class="sourceLineNo">318</span>}<a name="line.318"></a> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +</pre> +</div> +</body> +</html>
