| /* |
| * 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.flink.api.java.typeutils.runtime; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.api.common.typeutils.CompatibilityResult; |
| import org.apache.flink.api.common.typeutils.GenericTypeSerializerConfigSnapshot; |
| import org.apache.flink.api.common.typeutils.TypeSerializer; |
| import org.apache.flink.api.common.typeutils.TypeSerializerConfigSnapshot; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.core.memory.DataOutputView; |
| import org.apache.flink.util.InstantiationUtil; |
| |
| import com.esotericsoftware.kryo.Kryo; |
| import org.apache.hadoop.io.NullWritable; |
| import org.apache.hadoop.io.Writable; |
| import org.objenesis.strategy.StdInstantiatorStrategy; |
| |
| import java.io.IOException; |
| |
| /** |
| * A {@link TypeSerializer} for {@link Writable}. |
| * @param <T> |
| */ |
| @Internal |
| public final class WritableSerializer<T extends Writable> extends TypeSerializer<T> { |
| |
| private static final long serialVersionUID = 1L; |
| |
| private final Class<T> typeClass; |
| |
| private transient Kryo kryo; |
| |
| private transient T copyInstance; |
| |
| public WritableSerializer(Class<T> typeClass) { |
| this.typeClass = typeClass; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public T createInstance() { |
| if (typeClass == NullWritable.class) { |
| return (T) NullWritable.get(); |
| } |
| return InstantiationUtil.instantiate(typeClass); |
| } |
| |
| @Override |
| public T copy(T from) { |
| checkKryoInitialized(); |
| |
| return KryoUtils.copy(from, kryo, this); |
| } |
| |
| @Override |
| public T copy(T from, T reuse) { |
| checkKryoInitialized(); |
| |
| return KryoUtils.copy(from, reuse, kryo, this); |
| } |
| |
| @Override |
| public int getLength() { |
| return -1; |
| } |
| |
| @Override |
| public void serialize(T record, DataOutputView target) throws IOException { |
| record.write(target); |
| } |
| |
| @Override |
| public T deserialize(DataInputView source) throws IOException { |
| return deserialize(createInstance(), source); |
| } |
| |
| @Override |
| public T deserialize(T reuse, DataInputView source) throws IOException { |
| reuse.readFields(source); |
| return reuse; |
| } |
| |
| @Override |
| public void copy(DataInputView source, DataOutputView target) throws IOException { |
| ensureInstanceInstantiated(); |
| copyInstance.readFields(source); |
| copyInstance.write(target); |
| } |
| |
| @Override |
| public boolean isImmutableType() { |
| return false; |
| } |
| |
| @Override |
| public WritableSerializer<T> duplicate() { |
| return new WritableSerializer<T>(typeClass); |
| } |
| |
| // -------------------------------------------------------------------------------------------- |
| |
| private void ensureInstanceInstantiated() { |
| if (copyInstance == null) { |
| copyInstance = createInstance(); |
| } |
| } |
| |
| private void checkKryoInitialized() { |
| if (this.kryo == null) { |
| this.kryo = new Kryo(); |
| |
| Kryo.DefaultInstantiatorStrategy instantiatorStrategy = new Kryo.DefaultInstantiatorStrategy(); |
| instantiatorStrategy.setFallbackInstantiatorStrategy(new StdInstantiatorStrategy()); |
| kryo.setInstantiatorStrategy(instantiatorStrategy); |
| |
| this.kryo.setAsmEnabled(true); |
| this.kryo.register(typeClass); |
| } |
| } |
| // -------------------------------------------------------------------------------------------- |
| |
| @Override |
| public int hashCode() { |
| return this.typeClass.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof WritableSerializer) { |
| WritableSerializer<?> other = (WritableSerializer<?>) obj; |
| |
| return other.canEqual(this) && typeClass == other.typeClass; |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public boolean canEqual(Object obj) { |
| return obj instanceof WritableSerializer; |
| } |
| |
| // -------------------------------------------------------------------------------------------- |
| // Serializer configuration snapshotting & compatibility |
| // -------------------------------------------------------------------------------------------- |
| |
| @Override |
| public WritableSerializerConfigSnapshot<T> snapshotConfiguration() { |
| return new WritableSerializerConfigSnapshot<>(typeClass); |
| } |
| |
| @Override |
| public CompatibilityResult<T> ensureCompatibility(TypeSerializerConfigSnapshot configSnapshot) { |
| if (configSnapshot instanceof WritableSerializerConfigSnapshot |
| && typeClass.equals(((WritableSerializerConfigSnapshot) configSnapshot).getTypeClass())) { |
| |
| return CompatibilityResult.compatible(); |
| } else { |
| return CompatibilityResult.requiresMigration(); |
| } |
| } |
| |
| /** |
| * The config snapshot for this serializer. |
| * @param <T> |
| */ |
| public static final class WritableSerializerConfigSnapshot<T extends Writable> |
| extends GenericTypeSerializerConfigSnapshot<T> { |
| |
| private static final int VERSION = 1; |
| |
| /** This empty nullary constructor is required for deserializing the configuration. */ |
| public WritableSerializerConfigSnapshot() {} |
| |
| public WritableSerializerConfigSnapshot(Class<T> writableTypeClass) { |
| super(writableTypeClass); |
| } |
| |
| @Override |
| public int getVersion() { |
| return VERSION; |
| } |
| } |
| } |