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[FLINK-5602] Introduce artifical namespace serializer for migration
This closes apache#3200. This closes apache#3198.
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116 changes: 116 additions & 0 deletions
116
...k-runtime/src/main/java/org/apache/flink/migration/MigrationNamespaceSerializerProxy.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.migration; | ||
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| import org.apache.flink.api.common.typeutils.TypeSerializer; | ||
| import org.apache.flink.core.memory.DataInputView; | ||
| import org.apache.flink.core.memory.DataOutputView; | ||
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| import java.io.IOException; | ||
| import java.io.Serializable; | ||
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| /** | ||
| * 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 | ||
| public class MigrationNamespaceSerializerProxy extends TypeSerializer<Serializable> { | ||
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| public static final MigrationNamespaceSerializerProxy INSTANCE = new MigrationNamespaceSerializerProxy(); | ||
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| private static final long serialVersionUID = -707800010807094491L; | ||
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| private MigrationNamespaceSerializerProxy() { | ||
| } | ||
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| @Override | ||
| public boolean isImmutableType() { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public TypeSerializer<Serializable> duplicate() { | ||
| throw new UnsupportedOperationException( | ||
| "This is just a proxy used during migration until the real type serializer is provided by the user."); | ||
| } | ||
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| @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."); | ||
| } | ||
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| @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."); | ||
| } | ||
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| @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."); | ||
| } | ||
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| @Override | ||
| public int getLength() { | ||
| return -1; | ||
| } | ||
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| @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."); | ||
| } | ||
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| @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."); | ||
| } | ||
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| @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."); | ||
| } | ||
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| @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."); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object obj) { | ||
| return obj instanceof MigrationNamespaceSerializerProxy; | ||
| } | ||
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| @Override | ||
| public boolean canEqual(Object obj) { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return 42; | ||
| } | ||
| } |
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