/**
* 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 static org.junit.Assert.*;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.FastWritableRegister.FastWritableId;
import org.apache.hadoop.io.FastWritableRegister.FastWritable;
import org.junit.Before;
import org.junit.Test;
public class TestFastWritable {
public static final Log LOG = LogFactory.getLog(TestFastWritable.class
.getName());
static class FW1 implements FastWritable {
@Override
public void write(DataOutput out) throws IOException {
}
@Override
public void readFields(DataInput in) throws IOException {
}
@Override
public FastWritable getFastWritableInstance(Configuration conf) {
return new FW1();
}
@Override
public byte[] getSerializedName() {
return ObjectWritable
.prepareCachedNameBytes(FastWritableRegister.FastWritableId.SERIAL_VERSION_ID_1
.toString());
}
}
static class FW2 implements FastWritable {
@Override
public void write(DataOutput out) throws IOException {
}
@Override
public void readFields(DataInput in) throws IOException {
}
@Override
public FastWritable getFastWritableInstance(Configuration conf) {
return new FW2();
}
@Override
public byte[] getSerializedName() {
return ObjectWritable
.prepareCachedNameBytes(FastWritableRegister.FastWritableId.SERIAL_VERSION_ID_1
.toString());
}
}
@Before
public void setUp() {
FastWritableRegister.clear();
}
@Test
public void testBasic() {
FW1 fw1 = new FW1();
FW2 fw2 = new FW2();
FastWritableRegister.register(FastWritableId.SERIAL_VERSION_ID_1, fw1);
FastWritableRegister.register(FastWritableId.SERIAL_VERSION_ID_2, fw2);
assertTrue(FastWritableRegister.tryGetInstance(
FastWritableId.SERIAL_VERSION_ID_1.toString(), new Configuration()) instanceof FW1);
assertTrue(FastWritableRegister.tryGetInstance(
FastWritableId.SERIAL_VERSION_ID_2.toString(), new Configuration()) instanceof FW2);
}
@Test
public void testUnique() {
FW1 fw1 = new FW1();
FW2 fw2 = new FW2();
// registering twice the same singleton should be fine
FastWritableRegister.register(FastWritableId.SERIAL_VERSION_ID_1, fw1);
FastWritableRegister.register(FastWritableId.SERIAL_VERSION_ID_1, fw1);
try {
FastWritableRegister.register(FastWritableId.SERIAL_VERSION_ID_1,
new FW1());
fail("Should not allow to register the same name even with the same type");
} catch (Exception e) {
LOG.info("Expected exception " + e.getMessage());
}
try {
FastWritableRegister.register(FastWritableId.SERIAL_VERSION_ID_1, fw1);
FastWritableRegister.register(FastWritableId.SERIAL_VERSION_ID_1, fw2);
fail("Should not allow to register two classes with the same name");
} catch (Exception e) {
LOG.info("Expected exception " + e.getMessage());
}
}
@Test
public void testInstance() {
FW1 fw1 = new FW1();
FastWritableRegister.register(FastWritableId.SERIAL_VERSION_ID_1, fw1);
Set<FastWritable> instances = new HashSet<FastWritable>();
Configuration conf = new Configuration();
for (int i = 0; i < 100; i++) {
instances.add(FastWritableRegister.tryGetInstance(
FastWritableId.SERIAL_VERSION_ID_1.toString(), conf));
}
assertEquals(100, instances.size());
}
}