| /* |
| * 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.common.typeutils; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.core.memory.DataOutputView; |
| import org.apache.flink.util.Preconditions; |
| |
| import javax.annotation.Nonnull; |
| |
| import java.io.IOException; |
| |
| /** |
| * A utility {@link TypeSerializerConfigSnapshot} that is used for backwards compatibility purposes. |
| * |
| * <p>In older versions of Flink (<= 1.2), we only wrote serializers and not their corresponding snapshots. |
| * This class serves as a wrapper around the restored serializer instances. |
| * |
| * @param <T> the data type that the wrapped serializer instance serializes. |
| */ |
| @Internal |
| public class BackwardsCompatibleSerializerSnapshot<T> implements TypeSerializerSnapshot<T> { |
| |
| /** |
| * The serializer instance written in savepoints. |
| */ |
| @Nonnull |
| private TypeSerializer<T> serializerInstance; |
| |
| public BackwardsCompatibleSerializerSnapshot(TypeSerializer<T> serializerInstance) { |
| this.serializerInstance = Preconditions.checkNotNull(serializerInstance); |
| } |
| |
| @Override |
| public void writeSnapshot(DataOutputView out) throws IOException { |
| throw new UnsupportedOperationException( |
| "This is a dummy config snapshot used only for backwards compatibility."); |
| } |
| |
| @Override |
| public void readSnapshot(int version, DataInputView in, ClassLoader userCodeClassLoader) throws IOException { |
| throw new UnsupportedOperationException( |
| "This is a dummy config snapshot used only for backwards compatibility."); |
| } |
| |
| @Override |
| public int getCurrentVersion() { |
| throw new UnsupportedOperationException( |
| "This is a dummy config snapshot used only for backwards compatibility."); |
| } |
| |
| @Override |
| public TypeSerializer<T> restoreSerializer() { |
| return serializerInstance; |
| } |
| |
| @Override |
| public TypeSerializerSchemaCompatibility<T> resolveSchemaCompatibility(TypeSerializer<T> newSerializer) { |
| // if there is no configuration snapshot to check against, |
| // then we can only assume that the new serializer is compatible as is |
| return TypeSerializerSchemaCompatibility.compatibleAsIs(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return serializerInstance.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| BackwardsCompatibleSerializerSnapshot<?> that = (BackwardsCompatibleSerializerSnapshot<?>) o; |
| |
| return that.serializerInstance.equals(serializerInstance); |
| } |
| } |