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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * work for additional information regarding copyright ownership. The ASF<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * licenses this file to you under the Apache License, Version 2.0 (the<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * "License"); you may not use this file except in compliance with the License.<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * You may obtain a copy of the License at<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> *<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * License for the specific language governing permissions and limitations under<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * the License.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> */<a name="line.16"></a> |
| <span class="sourceLineNo">017</span>package org.apache.hadoop.hbase.io.hfile;<a name="line.17"></a> |
| <span class="sourceLineNo">018</span><a name="line.18"></a> |
| <span class="sourceLineNo">019</span>import java.util.Random;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import org.apache.hadoop.hbase.io.hfile.RandomDistribution.DiscreteRNG;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.hadoop.io.BytesWritable;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span><a name="line.23"></a> |
| <span class="sourceLineNo">024</span>/*<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>* <p><a name="line.25"></a> |
| <span class="sourceLineNo">026</span>* Copied from<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>* <a href="https://issues.apache.org/jira/browse/HADOOP-3315">hadoop-3315 tfile</a>.<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>* Remove after tfile is committed and use the tfile version of this class<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>* instead.</p><a name="line.29"></a> |
| <span class="sourceLineNo">030</span>*/<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>class KeySampler {<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> Random random;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> int min, max;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> DiscreteRNG keyLenRNG;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> private static final int MIN_KEY_LEN = 4;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span><a name="line.36"></a> |
| <span class="sourceLineNo">037</span> public KeySampler(Random random, byte [] first, byte [] last,<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> DiscreteRNG keyLenRNG) {<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> this.random = random;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> int firstLen = keyPrefixToInt(first);<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> int lastLen = keyPrefixToInt(last);<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> min = Math.min(firstLen, lastLen);<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> max = Math.max(firstLen, lastLen);<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> System.out.println(min);<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> System.out.println(max);<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> this.keyLenRNG = keyLenRNG;<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> }<a name="line.47"></a> |
| <span class="sourceLineNo">048</span><a name="line.48"></a> |
| <span class="sourceLineNo">049</span> private int keyPrefixToInt(byte [] key) {<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> byte[] b = key;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> int o = 0;<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> return (b[o] & 0xff) << 24 | (b[o + 1] & 0xff) << 16<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> | (b[o + 2] & 0xff) << 8 | (b[o + 3] & 0xff);<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> }<a name="line.54"></a> |
| <span class="sourceLineNo">055</span><a name="line.55"></a> |
| <span class="sourceLineNo">056</span> public void next(BytesWritable key) {<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> key.setSize(Math.max(MIN_KEY_LEN, keyLenRNG.nextInt()));<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> random.nextBytes(key.get());<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> int rnd = 0;<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> if (max != min) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> rnd = random.nextInt(max - min);<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> }<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> int n = rnd + min;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> byte[] b = key.get();<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> b[0] = (byte) (n >> 24);<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> b[1] = (byte) (n >> 16);<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> b[2] = (byte) (n >> 8);<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> b[3] = (byte) n;<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> |
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