org.apache.flink.migration.MigrationNamespaceSerializerProxy Maven / Gradle / Ivy
/*
* 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.migration;
import org.apache.flink.api.common.typeutils.CompatibilityResult;
import org.apache.flink.api.common.typeutils.ParameterlessTypeSerializerConfig;
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 java.io.IOException;
import java.io.Serializable;
/**
* The purpose of this class is the be filled in as a placeholder for the namespace serializer when migrating from
* Flink 1.1 savepoint (which did not include the namespace serializer) to Flink 1.2 (which always must include a
* (non-null) namespace serializer. This is then replaced as soon as the user is re-registering her state again for
* the first run under Flink 1.2 and provides again the real namespace serializer.
*
* @deprecated Internal class for savepoint backwards compatibility. Don't use for other purposes.
*/
@Deprecated
@SuppressWarnings("deprecation")
public class MigrationNamespaceSerializerProxy extends TypeSerializer {
public static final MigrationNamespaceSerializerProxy INSTANCE = new MigrationNamespaceSerializerProxy();
private static final long serialVersionUID = -707800010807094491L;
private MigrationNamespaceSerializerProxy() {
}
@Override
public boolean isImmutableType() {
return false;
}
@Override
public TypeSerializer duplicate() {
return this;
}
@Override
public Serializable createInstance() {
throw new UnsupportedOperationException(
"This is just a proxy used during migration until the real type serializer is provided by the user.");
}
@Override
public Serializable copy(Serializable from) {
throw new UnsupportedOperationException(
"This is just a proxy used during migration until the real type serializer is provided by the user.");
}
@Override
public Serializable copy(Serializable from, Serializable reuse) {
throw new UnsupportedOperationException(
"This is just a proxy used during migration until the real type serializer is provided by the user.");
}
@Override
public int getLength() {
return -1;
}
@Override
public void serialize(Serializable record, DataOutputView target) throws IOException {
throw new UnsupportedOperationException(
"This is just a proxy used during migration until the real type serializer is provided by the user.");
}
@Override
public Serializable deserialize(DataInputView source) throws IOException {
throw new UnsupportedOperationException(
"This is just a proxy used during migration until the real type serializer is provided by the user.");
}
@Override
public Serializable deserialize(Serializable reuse, DataInputView source) throws IOException {
throw new UnsupportedOperationException(
"This is just a proxy used during migration until the real type serializer is provided by the user.");
}
@Override
public void copy(DataInputView source, DataOutputView target) throws IOException {
throw new UnsupportedOperationException(
"This is just a proxy used during migration until the real type serializer is provided by the user.");
}
@Override
public TypeSerializerConfigSnapshot snapshotConfiguration() {
return new ParameterlessTypeSerializerConfig(getClass().getCanonicalName());
}
@Override
public CompatibilityResult ensureCompatibility(TypeSerializerConfigSnapshot configSnapshot) {
// always assume compatibility since we're just a proxy for migration
return CompatibilityResult.compatible();
}
@Override
public boolean equals(Object obj) {
return obj instanceof MigrationNamespaceSerializerProxy;
}
@Override
public boolean canEqual(Object obj) {
return true;
}
@Override
public int hashCode() {
return 42;
}
}