1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.io.file.tfile; |
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20 | |
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21 | import java.io.IOException; |
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22 | import java.util.Random; |
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23 | |
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24 | import junit.framework.Assert; |
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25 | import junit.framework.TestCase; |
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26 | |
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27 | import org.apache.hadoop.conf.Configuration; |
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28 | import org.apache.hadoop.fs.FSDataInputStream; |
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29 | import org.apache.hadoop.fs.FSDataOutputStream; |
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30 | import org.apache.hadoop.fs.FileSystem; |
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31 | import org.apache.hadoop.fs.Path; |
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32 | |
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33 | public class TestVLong extends TestCase { |
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34 | private static String ROOT = |
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35 | System.getProperty("test.build.data", "/tmp/tfile-test"); |
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36 | private Configuration conf; |
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37 | private FileSystem fs; |
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38 | private Path path; |
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39 | private String outputFile = "TestVLong"; |
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40 | |
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41 | @Override |
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42 | public void setUp() throws IOException { |
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43 | conf = new Configuration(); |
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44 | path = new Path(ROOT, outputFile); |
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45 | fs = path.getFileSystem(conf); |
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46 | if (fs.exists(path)) { |
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47 | fs.delete(path, false); |
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48 | } |
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49 | } |
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50 | |
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51 | @Override |
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52 | public void tearDown() throws IOException { |
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53 | if (fs.exists(path)) { |
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54 | fs.delete(path, false); |
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55 | } |
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56 | } |
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57 | |
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58 | public void testVLongByte() throws IOException { |
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59 | FSDataOutputStream out = fs.create(path); |
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60 | for (int i = Byte.MIN_VALUE; i <= Byte.MAX_VALUE; ++i) { |
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61 | Utils.writeVLong(out, i); |
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62 | } |
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63 | out.close(); |
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64 | Assert.assertEquals("Incorrect encoded size", (1 << Byte.SIZE) + 96, fs |
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65 | .getFileStatus( |
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66 | path).getLen()); |
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67 | |
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68 | FSDataInputStream in = fs.open(path); |
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69 | for (int i = Byte.MIN_VALUE; i <= Byte.MAX_VALUE; ++i) { |
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70 | long n = Utils.readVLong(in); |
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71 | Assert.assertEquals(n, i); |
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72 | } |
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73 | in.close(); |
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74 | fs.delete(path, false); |
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75 | } |
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76 | |
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77 | private long writeAndVerify(int shift) throws IOException { |
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78 | FSDataOutputStream out = fs.create(path); |
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79 | for (int i = Short.MIN_VALUE; i <= Short.MAX_VALUE; ++i) { |
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80 | Utils.writeVLong(out, ((long) i) << shift); |
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81 | } |
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82 | out.close(); |
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83 | FSDataInputStream in = fs.open(path); |
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84 | for (int i = Short.MIN_VALUE; i <= Short.MAX_VALUE; ++i) { |
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85 | long n = Utils.readVLong(in); |
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86 | Assert.assertEquals(n, ((long) i) << shift); |
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87 | } |
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88 | in.close(); |
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89 | long ret = fs.getFileStatus(path).getLen(); |
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90 | fs.delete(path, false); |
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91 | return ret; |
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92 | } |
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93 | |
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94 | public void testVLongShort() throws IOException { |
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95 | long size = writeAndVerify(0); |
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96 | Assert.assertEquals("Incorrect encoded size", (1 << Short.SIZE) * 2 |
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97 | + ((1 << Byte.SIZE) - 40) |
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98 | * (1 << Byte.SIZE) - 128 - 32, size); |
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99 | } |
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100 | |
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101 | public void testVLong3Bytes() throws IOException { |
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102 | long size = writeAndVerify(Byte.SIZE); |
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103 | Assert.assertEquals("Incorrect encoded size", (1 << Short.SIZE) * 3 |
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104 | + ((1 << Byte.SIZE) - 32) * (1 << Byte.SIZE) - 40 - 1, size); |
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105 | } |
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106 | |
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107 | public void testVLong4Bytes() throws IOException { |
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108 | long size = writeAndVerify(Byte.SIZE * 2); |
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109 | Assert.assertEquals("Incorrect encoded size", (1 << Short.SIZE) * 4 |
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110 | + ((1 << Byte.SIZE) - 16) * (1 << Byte.SIZE) - 32 - 2, size); |
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111 | } |
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112 | |
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113 | public void testVLong5Bytes() throws IOException { |
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114 | long size = writeAndVerify(Byte.SIZE * 3); |
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115 | Assert.assertEquals("Incorrect encoded size", (1 << Short.SIZE) * 6 - 256 |
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116 | - 16 - 3, size); |
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117 | } |
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118 | |
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119 | private void verifySixOrMoreBytes(int bytes) throws IOException { |
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120 | long size = writeAndVerify(Byte.SIZE * (bytes - 2)); |
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121 | Assert.assertEquals("Incorrect encoded size", (1 << Short.SIZE) |
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122 | * (bytes + 1) - 256 - bytes + 1, size); |
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123 | } |
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124 | public void testVLong6Bytes() throws IOException { |
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125 | verifySixOrMoreBytes(6); |
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126 | } |
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127 | |
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128 | public void testVLong7Bytes() throws IOException { |
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129 | verifySixOrMoreBytes(7); |
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130 | } |
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131 | |
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132 | public void testVLong8Bytes() throws IOException { |
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133 | verifySixOrMoreBytes(8); |
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134 | } |
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135 | |
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136 | public void testVLongRandom() throws IOException { |
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137 | int count = 1024 * 1024; |
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138 | long data[] = new long[count]; |
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139 | Random rng = new Random(); |
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140 | for (int i = 0; i < data.length; ++i) { |
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141 | int shift = rng.nextInt(Long.SIZE) + 1; |
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142 | long mask = (1L << shift) - 1; |
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143 | long a = rng.nextInt() << 32; |
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144 | long b = ((long) rng.nextInt()) & 0xffffffff; |
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145 | data[i] = (a + b) & mask; |
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146 | } |
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147 | |
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148 | FSDataOutputStream out = fs.create(path); |
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149 | for (int i = 0; i < data.length; ++i) { |
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150 | Utils.writeVLong(out, data[i]); |
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151 | } |
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152 | out.close(); |
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153 | |
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154 | FSDataInputStream in = fs.open(path); |
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155 | for (int i = 0; i < data.length; ++i) { |
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156 | Assert.assertEquals(Utils.readVLong(in), data[i]); |
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157 | } |
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158 | in.close(); |
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159 | fs.delete(path, false); |
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160 | } |
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161 | } |
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