org.apache.flink.runtime.state.RegisteredPriorityQueueStateBackendMetaInfo 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.state;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.TypeSerializerSchemaCompatibility;
import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot;
import org.apache.flink.runtime.state.metainfo.StateMetaInfoSnapshot;
import org.apache.flink.util.Preconditions;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Collections;
import java.util.Map;
/**
* Meta information about a priority queue state in a backend.
*/
public class RegisteredPriorityQueueStateBackendMetaInfo extends RegisteredStateMetaInfoBase {
@Nonnull
private final StateSerializerProvider elementSerializerProvider;
public RegisteredPriorityQueueStateBackendMetaInfo(
@Nonnull String name,
@Nonnull TypeSerializer elementSerializer) {
this(name, StateSerializerProvider.fromNewState(elementSerializer));
}
@SuppressWarnings("unchecked")
public RegisteredPriorityQueueStateBackendMetaInfo(StateMetaInfoSnapshot snapshot) {
this(
snapshot.getName(),
StateSerializerProvider.fromRestoredState(
(TypeSerializerSnapshot) Preconditions.checkNotNull(
snapshot.getTypeSerializerSnapshot(StateMetaInfoSnapshot.CommonSerializerKeys.VALUE_SERIALIZER))));
Preconditions.checkState(StateMetaInfoSnapshot.BackendStateType.PRIORITY_QUEUE == snapshot.getBackendStateType());
}
private RegisteredPriorityQueueStateBackendMetaInfo(
@Nonnull String name,
@Nonnull StateSerializerProvider elementSerializerProvider) {
super(name);
this.elementSerializerProvider = elementSerializerProvider;
}
@Nonnull
@Override
public StateMetaInfoSnapshot snapshot() {
return computeSnapshot();
}
@Nonnull
public TypeSerializer getElementSerializer() {
return elementSerializerProvider.currentSchemaSerializer();
}
@Nonnull
public TypeSerializerSchemaCompatibility updateElementSerializer(TypeSerializer newElementSerializer) {
return elementSerializerProvider.registerNewSerializerForRestoredState(newElementSerializer);
}
@Nullable
public TypeSerializer getPreviousElementSerializer() {
return elementSerializerProvider.previousSchemaSerializer();
}
private StateMetaInfoSnapshot computeSnapshot() {
TypeSerializer elementSerializer = getElementSerializer();
Map> serializerMap =
Collections.singletonMap(
StateMetaInfoSnapshot.CommonSerializerKeys.VALUE_SERIALIZER.toString(),
elementSerializer.duplicate());
Map> serializerSnapshotMap =
Collections.singletonMap(
StateMetaInfoSnapshot.CommonSerializerKeys.VALUE_SERIALIZER.toString(),
elementSerializer.snapshotConfiguration());
return new StateMetaInfoSnapshot(
name,
StateMetaInfoSnapshot.BackendStateType.PRIORITY_QUEUE,
Collections.emptyMap(),
serializerSnapshotMap,
serializerMap);
}
public RegisteredPriorityQueueStateBackendMetaInfo deepCopy() {
return new RegisteredPriorityQueueStateBackendMetaInfo<>(name, getElementSerializer().duplicate());
}
}