/*
* 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.beam.sdk.coders;
import static com.google.common.base.Preconditions.checkArgument;
import static org.hamcrest.Matchers.instanceOf;
import static org.junit.Assert.assertThat;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;
import org.apache.beam.sdk.coders.DefaultCoder.DefaultCoderProviderRegistrar.DefaultCoderProvider;
import org.apache.beam.sdk.values.TypeDescriptor;
import org.hamcrest.Matchers;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for {@link DefaultCoder}.
*/
@RunWith(JUnit4.class)
public class DefaultCoderTest {
@Rule public ExpectedException thrown = ExpectedException.none();
@DefaultCoder(AvroCoder.class)
private static class AvroRecord {
}
private static class SerializableBase implements Serializable {
}
@DefaultCoder(SerializableCoder.class)
private static class SerializableRecord extends SerializableBase {
}
@DefaultCoder(CustomSerializableCoder.class)
private static class CustomRecord extends SerializableBase {
}
@DefaultCoder(OldCustomSerializableCoder.class)
private static class OldCustomRecord extends SerializableBase {
}
private static class Unknown {
}
private static class CustomSerializableCoder extends SerializableCoder<CustomRecord> {
// Extending SerializableCoder isn't trivial, but it can be done.
@SuppressWarnings("unchecked")
public static <T extends Serializable> SerializableCoder<T> of(TypeDescriptor<T> recordType) {
checkArgument(recordType.isSupertypeOf(new TypeDescriptor<CustomRecord>() {}));
return (SerializableCoder<T>) new CustomSerializableCoder();
}
protected CustomSerializableCoder() {
super(CustomRecord.class, TypeDescriptor.of(CustomRecord.class));
}
@SuppressWarnings("unused")
public static CoderProvider getCoderProvider() {
return new CoderProvider() {
@Override
public <T> Coder<T> coderFor(TypeDescriptor<T> typeDescriptor,
List<? extends Coder<?>> componentCoders) throws CannotProvideCoderException {
return CustomSerializableCoder.of((TypeDescriptor) typeDescriptor);
}
};
}
}
private static class OldCustomSerializableCoder extends SerializableCoder<OldCustomRecord> {
// Extending SerializableCoder isn't trivial, but it can be done.
@Deprecated // old form using a Class
@SuppressWarnings("unchecked")
public static <T extends Serializable> SerializableCoder<T> of(Class<T> recordType) {
checkArgument(OldCustomRecord.class.isAssignableFrom(recordType));
return (SerializableCoder<T>) new OldCustomSerializableCoder();
}
protected OldCustomSerializableCoder() {
super(OldCustomRecord.class, TypeDescriptor.of(OldCustomRecord.class));
}
@SuppressWarnings("unused")
public static CoderProvider getCoderProvider() {
return new CoderProvider() {
@Override
public <T> Coder<T> coderFor(TypeDescriptor<T> typeDescriptor,
List<? extends Coder<?>> componentCoders) throws CannotProvideCoderException {
return OldCustomSerializableCoder.of((Class) typeDescriptor.getRawType());
}
};
}
}
@Test
public void testCodersWithoutComponents() throws Exception {
CoderRegistry registry = CoderRegistry.createDefault();
registry.registerCoderProvider(
new DefaultCoderProvider());
assertThat(registry.getCoder(AvroRecord.class),
instanceOf(AvroCoder.class));
assertThat(registry.getCoder(SerializableRecord.class),
instanceOf(SerializableCoder.class));
assertThat(registry.getCoder(CustomRecord.class),
instanceOf(CustomSerializableCoder.class));
assertThat(registry.getCoder(OldCustomRecord.class),
instanceOf(OldCustomSerializableCoder.class));
}
@Test
public void testDefaultCoderInCollection() throws Exception {
CoderRegistry registry = CoderRegistry.createDefault();
registry.registerCoderProvider(
new DefaultCoderProvider());
Coder<List<AvroRecord>> avroRecordCoder =
registry.getCoder(new TypeDescriptor<List<AvroRecord>>(){});
assertThat(avroRecordCoder, instanceOf(ListCoder.class));
assertThat(((ListCoder) avroRecordCoder).getElemCoder(), instanceOf(AvroCoder.class));
assertThat(registry.getCoder(new TypeDescriptor<List<SerializableRecord>>(){}),
Matchers.<Coder<List<SerializableRecord>>>equalTo(
ListCoder.of(SerializableCoder.of(SerializableRecord.class))));
}
@Test
public void testUnknown() throws Exception {
thrown.expect(CannotProvideCoderException.class);
new DefaultCoderProvider().coderFor(
TypeDescriptor.of(Unknown.class), Collections.<Coder<?>>emptyList());
}
}