| /* |
| * 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 java.io.IOException; |
| |
| 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.types.CopyableValue; |
| import org.apache.flink.util.InstantiationUtil; |
| |
| import static org.apache.flink.util.Preconditions.checkNotNull; |
| |
| @Internal |
| public final class CopyableValueSerializer<T extends CopyableValue<T>> extends TypeSerializer<T> { |
| |
| private static final long serialVersionUID = 1L; |
| |
| |
| private final Class<T> valueClass; |
| |
| private transient T instance; |
| |
| |
| public CopyableValueSerializer(Class<T> valueClass) { |
| this.valueClass = checkNotNull(valueClass); |
| } |
| |
| @Override |
| public boolean isImmutableType() { |
| return false; |
| } |
| |
| @Override |
| public CopyableValueSerializer<T> duplicate() { |
| return this; |
| } |
| |
| @Override |
| public T createInstance() { |
| return InstantiationUtil.instantiate(this.valueClass); |
| } |
| |
| @Override |
| public T copy(T from) { |
| return copy(from, createInstance()); |
| } |
| |
| @Override |
| public T copy(T from, T reuse) { |
| from.copyTo(reuse); |
| return reuse; |
| } |
| |
| @Override |
| public int getLength() { |
| ensureInstanceInstantiated(); |
| return instance.getBinaryLength(); |
| } |
| |
| @Override |
| public void serialize(T value, DataOutputView target) throws IOException { |
| value.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.read(source); |
| return reuse; |
| } |
| |
| @Override |
| public void copy(DataInputView source, DataOutputView target) throws IOException { |
| ensureInstanceInstantiated(); |
| instance.copy(source, target); |
| } |
| |
| // -------------------------------------------------------------------------------------------- |
| |
| private void ensureInstanceInstantiated() { |
| if (instance == null) { |
| instance = createInstance(); |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| return this.valueClass.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof CopyableValueSerializer) { |
| @SuppressWarnings("unchecked") |
| CopyableValueSerializer<T> copyableValueSerializer = (CopyableValueSerializer<T>) obj; |
| |
| return copyableValueSerializer.canEqual(this) && |
| valueClass == copyableValueSerializer.valueClass; |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public boolean canEqual(Object obj) { |
| return obj instanceof CopyableValueSerializer; |
| } |
| |
| // -------------------------------------------------------------------------------------------- |
| // Serializer configuration snapshotting & compatibility |
| // -------------------------------------------------------------------------------------------- |
| |
| @Override |
| public CopyableValueSerializerConfigSnapshot<T> snapshotConfiguration() { |
| return new CopyableValueSerializerConfigSnapshot<>(valueClass); |
| } |
| |
| @Override |
| public CompatibilityResult<T> ensureCompatibility(TypeSerializerConfigSnapshot configSnapshot) { |
| if (configSnapshot instanceof CopyableValueSerializerConfigSnapshot |
| && valueClass.equals(((CopyableValueSerializerConfigSnapshot) configSnapshot).getTypeClass())) { |
| return CompatibilityResult.compatible(); |
| } else { |
| return CompatibilityResult.requiresMigration(); |
| } |
| } |
| |
| public static final class CopyableValueSerializerConfigSnapshot<T extends CopyableValue<T>> |
| extends GenericTypeSerializerConfigSnapshot<T> { |
| |
| private static final int VERSION = 1; |
| |
| /** This empty nullary constructor is required for deserializing the configuration. */ |
| public CopyableValueSerializerConfigSnapshot() {} |
| |
| public CopyableValueSerializerConfigSnapshot(Class<T> copyableValueClass) { |
| super(copyableValueClass); |
| } |
| |
| @Override |
| public int getVersion() { |
| return VERSION; |
| } |
| } |
| } |