TestGenericWritable.java
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上传日期:2018-01-08
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- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.apache.hadoop.io;
- import java.io.DataInput;
- import java.io.DataOutput;
- import java.io.IOException;
- import junit.framework.TestCase;
- import org.apache.hadoop.conf.Configurable;
- import org.apache.hadoop.conf.Configuration;
- /**
- * TestCase for {@link GenericWritable} class.
- * @see TestWritable#testWritable(Writable)
- */
- public class TestGenericWritable extends TestCase {
- private Configuration conf;
- public static final String CONF_TEST_KEY = "test.generic.writable";
- public static final String CONF_TEST_VALUE = "dummy";
- @Override
- protected void setUp() throws Exception {
- super.setUp();
- conf = new Configuration();
- //set the configuration parameter
- conf.set(CONF_TEST_KEY, CONF_TEST_VALUE);
- }
- /** Dummy class for testing {@link GenericWritable} */
- public static class Foo implements Writable {
- private String foo = "foo";
- public void readFields(DataInput in) throws IOException {
- foo = Text.readString(in);
- }
- public void write(DataOutput out) throws IOException {
- Text.writeString(out, foo);
- }
- @Override
- public boolean equals(Object obj) {
- if (!(obj instanceof Foo))
- return false;
- return this.foo.equals(((Foo)obj).foo);
- }
- }
- /** Dummy class for testing {@link GenericWritable} */
- public static class Bar implements Writable, Configurable {
- private int bar = 42; //The Answer to The Ultimate Question Of Life, the Universe and Everything
- private Configuration conf = null;
- public void readFields(DataInput in) throws IOException {
- bar = in.readInt();
- }
- public void write(DataOutput out) throws IOException {
- out.writeInt(bar);
- }
- public Configuration getConf() {
- return conf;
- }
- public void setConf(Configuration conf) {
- this.conf = conf;
- }
- @Override
- public boolean equals(Object obj) {
- if (!(obj instanceof Bar))
- return false;
- return this.bar == ((Bar)obj).bar;
- }
- }
- /** Dummy class for testing {@link GenericWritable} */
- public static class Baz extends Bar {
- @Override
- public void readFields(DataInput in) throws IOException {
- super.readFields(in);
- //needs a configuration parameter
- assertEquals("Configuration is not set for the wrapped object",
- CONF_TEST_VALUE, getConf().get(CONF_TEST_KEY));
- }
- @Override
- public void write(DataOutput out) throws IOException {
- super.write(out);
- }
- }
- /** Dummy class for testing {@link GenericWritable} */
- public static class FooGenericWritable extends GenericWritable {
- @Override
- @SuppressWarnings("unchecked")
- protected Class<? extends Writable>[] getTypes() {
- return new Class[] {Foo.class, Bar.class, Baz.class};
- }
- @Override
- public boolean equals(Object obj) {
- if(! (obj instanceof FooGenericWritable))
- return false;
- return get().equals(((FooGenericWritable)obj).get());
- }
- }
- public void testFooWritable() throws Exception {
- System.out.println("Testing Writable wrapped in GenericWritable");
- FooGenericWritable generic = new FooGenericWritable();
- generic.setConf(conf);
- Foo foo = new Foo();
- generic.set(foo);
- TestWritable.testWritable(generic);
- }
- public void testBarWritable() throws Exception {
- System.out.println("Testing Writable, Configurable wrapped in GenericWritable");
- FooGenericWritable generic = new FooGenericWritable();
- generic.setConf(conf);
- Bar bar = new Bar();
- bar.setConf(conf);
- generic.set(bar);
- //test writing generic writable
- FooGenericWritable after
- = (FooGenericWritable)TestWritable.testWritable(generic, conf);
- //test configuration
- System.out.println("Testing if Configuration is passed to wrapped classes");
- assertTrue(after.get() instanceof Configurable);
- assertNotNull(((Configurable)after.get()).getConf());
- }
- public void testBazWritable() throws Exception {
- System.out.println("Testing for GenericWritable to find class names");
- FooGenericWritable generic = new FooGenericWritable();
- generic.setConf(conf);
- Baz baz = new Baz();
- generic.set(baz);
- TestWritable.testWritable(generic, conf);
- }
- public void testSet() throws Exception {
- Foo foo = new Foo();
- FooGenericWritable generic = new FooGenericWritable();
- //exception should not occur
- generic.set(foo);
- try {
- //exception should occur, since IntWritable is not registered
- generic = new FooGenericWritable();
- generic.set(new IntWritable(1));
- fail("Generic writable should have thrown an exception for a Writable not registered");
- }catch (RuntimeException e) {
- //ignore
- }
- }
- public void testGet() throws Exception {
- Foo foo = new Foo();
- FooGenericWritable generic = new FooGenericWritable();
- generic.set(foo);
- assertEquals(foo, generic.get());
- }
- }