[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.DataInput; |
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| 22 | import java.io.DataOutput; |
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| 23 | import java.io.IOException; |
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| 24 | |
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| 25 | import junit.framework.TestCase; |
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| 26 | |
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| 27 | import org.apache.hadoop.conf.Configurable; |
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| 28 | import org.apache.hadoop.conf.Configuration; |
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| 29 | |
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| 30 | /** |
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| 31 | * TestCase for {@link GenericWritable} class. |
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| 32 | * @see TestWritable#testWritable(Writable) |
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| 33 | */ |
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| 34 | public class TestGenericWritable extends TestCase { |
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| 35 | |
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| 36 | private Configuration conf; |
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| 37 | public static final String CONF_TEST_KEY = "test.generic.writable"; |
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| 38 | public static final String CONF_TEST_VALUE = "dummy"; |
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| 39 | |
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| 40 | @Override |
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| 41 | protected void setUp() throws Exception { |
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| 42 | super.setUp(); |
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| 43 | conf = new Configuration(); |
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| 44 | //set the configuration parameter |
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| 45 | conf.set(CONF_TEST_KEY, CONF_TEST_VALUE); |
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| 46 | } |
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| 47 | |
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| 48 | /** Dummy class for testing {@link GenericWritable} */ |
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| 49 | public static class Foo implements Writable { |
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| 50 | private String foo = "foo"; |
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| 51 | public void readFields(DataInput in) throws IOException { |
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| 52 | foo = Text.readString(in); |
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| 53 | } |
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| 54 | public void write(DataOutput out) throws IOException { |
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| 55 | Text.writeString(out, foo); |
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| 56 | } |
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| 57 | @Override |
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| 58 | public boolean equals(Object obj) { |
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| 59 | if (!(obj instanceof Foo)) |
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| 60 | return false; |
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| 61 | return this.foo.equals(((Foo)obj).foo); |
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| 62 | } |
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| 63 | } |
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| 64 | /** Dummy class for testing {@link GenericWritable} */ |
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| 65 | public static class Bar implements Writable, Configurable { |
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| 66 | private int bar = 42; //The Answer to The Ultimate Question Of Life, the Universe and Everything |
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| 67 | private Configuration conf = null; |
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| 68 | public void readFields(DataInput in) throws IOException { |
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| 69 | bar = in.readInt(); |
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| 70 | } |
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| 71 | public void write(DataOutput out) throws IOException { |
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| 72 | out.writeInt(bar); |
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| 73 | } |
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| 74 | public Configuration getConf() { |
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| 75 | return conf; |
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| 76 | } |
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| 77 | public void setConf(Configuration conf) { |
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| 78 | this.conf = conf; |
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| 79 | } |
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| 80 | @Override |
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| 81 | public boolean equals(Object obj) { |
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| 82 | if (!(obj instanceof Bar)) |
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| 83 | return false; |
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| 84 | return this.bar == ((Bar)obj).bar; |
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| 85 | } |
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| 86 | } |
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| 87 | |
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| 88 | /** Dummy class for testing {@link GenericWritable} */ |
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| 89 | public static class Baz extends Bar { |
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| 90 | @Override |
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| 91 | public void readFields(DataInput in) throws IOException { |
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| 92 | super.readFields(in); |
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| 93 | //needs a configuration parameter |
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| 94 | assertEquals("Configuration is not set for the wrapped object", |
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| 95 | CONF_TEST_VALUE, getConf().get(CONF_TEST_KEY)); |
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| 96 | } |
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| 97 | @Override |
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| 98 | public void write(DataOutput out) throws IOException { |
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| 99 | super.write(out); |
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| 100 | } |
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| 101 | } |
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| 102 | |
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| 103 | /** Dummy class for testing {@link GenericWritable} */ |
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| 104 | public static class FooGenericWritable extends GenericWritable { |
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| 105 | @Override |
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| 106 | @SuppressWarnings("unchecked") |
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| 107 | protected Class<? extends Writable>[] getTypes() { |
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| 108 | return new Class[] {Foo.class, Bar.class, Baz.class}; |
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| 109 | } |
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| 110 | @Override |
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| 111 | public boolean equals(Object obj) { |
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| 112 | if(! (obj instanceof FooGenericWritable)) |
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| 113 | return false; |
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| 114 | return get().equals(((FooGenericWritable)obj).get()); |
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| 115 | } |
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| 116 | } |
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| 117 | |
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| 118 | public void testFooWritable() throws Exception { |
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| 119 | System.out.println("Testing Writable wrapped in GenericWritable"); |
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| 120 | FooGenericWritable generic = new FooGenericWritable(); |
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| 121 | generic.setConf(conf); |
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| 122 | Foo foo = new Foo(); |
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| 123 | generic.set(foo); |
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| 124 | TestWritable.testWritable(generic); |
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| 125 | } |
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| 126 | |
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| 127 | public void testBarWritable() throws Exception { |
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| 128 | System.out.println("Testing Writable, Configurable wrapped in GenericWritable"); |
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| 129 | FooGenericWritable generic = new FooGenericWritable(); |
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| 130 | generic.setConf(conf); |
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| 131 | Bar bar = new Bar(); |
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| 132 | bar.setConf(conf); |
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| 133 | generic.set(bar); |
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| 134 | |
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| 135 | //test writing generic writable |
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| 136 | FooGenericWritable after |
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| 137 | = (FooGenericWritable)TestWritable.testWritable(generic, conf); |
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| 138 | |
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| 139 | //test configuration |
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| 140 | System.out.println("Testing if Configuration is passed to wrapped classes"); |
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| 141 | assertTrue(after.get() instanceof Configurable); |
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| 142 | assertNotNull(((Configurable)after.get()).getConf()); |
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| 143 | } |
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| 144 | |
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| 145 | public void testBazWritable() throws Exception { |
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| 146 | System.out.println("Testing for GenericWritable to find class names"); |
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| 147 | FooGenericWritable generic = new FooGenericWritable(); |
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| 148 | generic.setConf(conf); |
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| 149 | Baz baz = new Baz(); |
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| 150 | generic.set(baz); |
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| 151 | TestWritable.testWritable(generic, conf); |
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| 152 | } |
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| 153 | |
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| 154 | public void testSet() throws Exception { |
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| 155 | Foo foo = new Foo(); |
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| 156 | FooGenericWritable generic = new FooGenericWritable(); |
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| 157 | //exception should not occur |
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| 158 | generic.set(foo); |
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| 159 | |
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| 160 | try { |
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| 161 | //exception should occur, since IntWritable is not registered |
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| 162 | generic = new FooGenericWritable(); |
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| 163 | generic.set(new IntWritable(1)); |
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| 164 | fail("Generic writable should have thrown an exception for a Writable not registered"); |
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| 165 | }catch (RuntimeException e) { |
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| 166 | //ignore |
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| 167 | } |
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| 168 | |
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| 169 | } |
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| 170 | |
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| 171 | public void testGet() throws Exception { |
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| 172 | Foo foo = new Foo(); |
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| 173 | FooGenericWritable generic = new FooGenericWritable(); |
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| 174 | generic.set(foo); |
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| 175 | assertEquals(foo, generic.get()); |
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| 176 | } |
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| 177 | |
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| 178 | } |
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