org.apache.flink.runtime.checkpoint.metadata.MetadataSerializers 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.runtime.checkpoint.metadata;
import java.util.HashMap;
import java.util.Map;
/**
* Helper to access {@link MetadataSerializer}s for specific format versions.
*
* The serializer for a specific version can be obtained via {@link #getSerializer(int)}.
*/
public class MetadataSerializers {
private static final Map SERIALIZERS = new HashMap<>(3);
static {
registerSerializer(MetadataV1Serializer.INSTANCE);
registerSerializer(MetadataV2Serializer.INSTANCE);
registerSerializer(MetadataV3Serializer.INSTANCE);
}
private static void registerSerializer(MetadataSerializer serializer) {
SERIALIZERS.put(serializer.getVersion(), serializer);
}
/**
* Returns the {@link MetadataSerializer} for the given savepoint version.
*
* @param version Savepoint version to get serializer for
* @return Savepoint for the given version
* @throws IllegalArgumentException If unknown savepoint version
*/
public static MetadataSerializer getSerializer(int version) {
MetadataSerializer serializer = SERIALIZERS.get(version);
if (serializer != null) {
return serializer;
} else {
throw new IllegalArgumentException(
"Unrecognized checkpoint version number: " + version);
}
}
// ------------------------------------------------------------------------
/** Utility method class, not meant to be instantiated. */
private MetadataSerializers() {}
}