[120] | 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; |
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| 20 | |
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| 21 | import java.io.*; |
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| 22 | import java.util.Random; |
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| 23 | import junit.framework.TestCase; |
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| 24 | |
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| 25 | /** Unit tests for VersionedWritable. */ |
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| 26 | |
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| 27 | public class TestVersionedWritable extends TestCase { |
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| 28 | |
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| 29 | public TestVersionedWritable(String name) { super(name); } |
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| 30 | |
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| 31 | |
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| 32 | /** Example class used in test cases below. */ |
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| 33 | public static class SimpleVersionedWritable extends VersionedWritable { |
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| 34 | |
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| 35 | private static final Random RANDOM = new Random(); |
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| 36 | int state = RANDOM.nextInt(); |
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| 37 | |
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| 38 | |
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| 39 | private static byte VERSION = 1; |
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| 40 | public byte getVersion() { |
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| 41 | return VERSION; |
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| 42 | } |
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| 43 | |
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| 44 | |
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| 45 | public void write(DataOutput out) throws IOException { |
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| 46 | super.write(out); // version. |
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| 47 | out.writeInt(state); |
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| 48 | } |
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| 49 | |
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| 50 | public void readFields(DataInput in) throws IOException { |
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| 51 | super.readFields(in); // version |
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| 52 | this.state = in.readInt(); |
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| 53 | } |
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| 54 | |
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| 55 | |
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| 56 | public static SimpleVersionedWritable read(DataInput in) throws IOException { |
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| 57 | SimpleVersionedWritable result = new SimpleVersionedWritable(); |
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| 58 | result.readFields(in); |
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| 59 | return result; |
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| 60 | } |
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| 61 | |
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| 62 | |
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| 63 | /** Required by test code, below. */ |
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| 64 | public boolean equals(Object o) { |
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| 65 | if (!(o instanceof SimpleVersionedWritable)) |
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| 66 | return false; |
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| 67 | SimpleVersionedWritable other = (SimpleVersionedWritable)o; |
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| 68 | return this.state == other.state; |
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| 69 | } |
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| 70 | |
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| 71 | } |
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| 72 | |
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| 73 | |
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| 74 | |
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| 75 | public static class AdvancedVersionedWritable extends SimpleVersionedWritable { |
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| 76 | |
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| 77 | String shortTestString = "Now is the time for all good men to come to the aid of the Party"; |
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| 78 | String longTestString = "Four score and twenty years ago. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah."; |
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| 79 | |
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| 80 | String compressableTestString = |
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| 81 | "Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. " + |
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| 82 | "Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. " + |
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| 83 | "Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. Blah. "; |
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| 84 | |
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| 85 | SimpleVersionedWritable containedObject = new SimpleVersionedWritable(); |
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| 86 | String[] testStringArray = {"The", "Quick", "Brown", "Fox", "Jumped", "Over", "The", "Lazy", "Dog"}; |
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| 87 | |
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| 88 | public void write(DataOutput out) throws IOException { |
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| 89 | super.write(out); |
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| 90 | out.writeUTF(shortTestString); |
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| 91 | WritableUtils.writeString(out, longTestString); |
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| 92 | int comp = WritableUtils.writeCompressedString(out, compressableTestString); |
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| 93 | System.out.println("Compression is " + comp + "%"); |
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| 94 | containedObject.write(out); // Warning if this is a recursive call, you need a null value. |
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| 95 | WritableUtils.writeStringArray(out, testStringArray); |
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| 96 | |
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| 97 | } |
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| 98 | |
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| 99 | |
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| 100 | public void readFields(DataInput in) throws IOException { |
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| 101 | super.readFields(in); |
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| 102 | shortTestString = in.readUTF(); |
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| 103 | longTestString = WritableUtils.readString(in); |
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| 104 | compressableTestString = WritableUtils.readCompressedString(in); |
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| 105 | containedObject.readFields(in); // Warning if this is a recursive call, you need a null value. |
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| 106 | testStringArray = WritableUtils.readStringArray(in); |
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| 107 | } |
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| 108 | |
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| 109 | |
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| 110 | |
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| 111 | public boolean equals(Object o) { |
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| 112 | super.equals(o); |
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| 113 | |
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| 114 | if (!shortTestString.equals(((AdvancedVersionedWritable)o).shortTestString)) { return false;} |
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| 115 | if (!longTestString.equals(((AdvancedVersionedWritable)o).longTestString)) { return false;} |
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| 116 | if (!compressableTestString.equals(((AdvancedVersionedWritable)o).compressableTestString)) { return false;} |
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| 117 | |
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| 118 | if (testStringArray.length != ((AdvancedVersionedWritable)o).testStringArray.length) { return false;} |
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| 119 | for(int i=0;i< testStringArray.length;i++){ |
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| 120 | if (!testStringArray[i].equals(((AdvancedVersionedWritable)o).testStringArray[i])) { |
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| 121 | return false; |
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| 122 | } |
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| 123 | } |
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| 124 | |
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| 125 | if (!containedObject.equals(((AdvancedVersionedWritable)o).containedObject)) { return false;} |
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| 126 | |
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| 127 | return true; |
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| 128 | } |
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| 129 | |
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| 130 | |
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| 131 | |
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| 132 | } |
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| 133 | |
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| 134 | /* This one checks that version mismatch is thrown... */ |
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| 135 | public static class SimpleVersionedWritableV2 extends SimpleVersionedWritable { |
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| 136 | static byte VERSION = 2; |
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| 137 | public byte getVersion() { |
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| 138 | return VERSION; |
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| 139 | } |
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| 140 | } |
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| 141 | |
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| 142 | |
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| 143 | /** Test 1: Check that SimpleVersionedWritable. */ |
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| 144 | public void testSimpleVersionedWritable() throws Exception { |
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| 145 | TestWritable.testWritable(new SimpleVersionedWritable()); |
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| 146 | } |
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| 147 | |
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| 148 | /** Test 2: Check that AdvancedVersionedWritable Works (well, why wouldn't it!). */ |
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| 149 | public void testAdvancedVersionedWritable() throws Exception { |
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| 150 | TestWritable.testWritable(new AdvancedVersionedWritable()); |
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| 151 | } |
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| 152 | |
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| 153 | /** Test 3: Check that SimpleVersionedWritable throws an Exception. */ |
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| 154 | public void testSimpleVersionedWritableMismatch() throws Exception { |
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| 155 | TestVersionedWritable.testVersionedWritable(new SimpleVersionedWritable(), new SimpleVersionedWritableV2()); |
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| 156 | } |
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| 157 | |
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| 158 | |
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| 159 | |
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| 160 | |
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| 161 | /** Utility method for testing VersionedWritables. */ |
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| 162 | public static void testVersionedWritable(Writable before, Writable after) throws Exception { |
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| 163 | DataOutputBuffer dob = new DataOutputBuffer(); |
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| 164 | before.write(dob); |
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| 165 | |
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| 166 | DataInputBuffer dib = new DataInputBuffer(); |
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| 167 | dib.reset(dob.getData(), dob.getLength()); |
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| 168 | |
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| 169 | try { |
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| 170 | after.readFields(dib); |
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| 171 | } catch (VersionMismatchException vmme) { |
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| 172 | System.out.println("Good, we expected this:" + vmme); |
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| 173 | return; |
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| 174 | } |
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| 175 | |
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| 176 | throw new Exception("A Version Mismatch Didn't Happen!"); |
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| 177 | } |
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| 178 | } |
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| 179 | |
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