org.apache.flink.runtime.state.heap.NestedMapsStateTable Maven / Gradle / Ivy
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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.
*/
package org.apache.flink.runtime.state.heap;
import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.state.RegisteredKeyValueStateBackendMetaInfo;
import org.apache.flink.runtime.state.StateSnapshotTransformer;
import javax.annotation.Nonnull;
/**
* This implementation of {@link StateTable} uses {@link NestedStateMap}.
*
* @param type of key.
* @param type of namespace.
* @param type of state.
*/
@Internal
public class NestedMapsStateTable extends StateTable {
/**
* Creates a new {@link NestedMapsStateTable} for the given key context and meta info.
* @param keyContext the key context.
* @param metaInfo the meta information for this state table.
* @param keySerializer the serializer of the key.
*/
public NestedMapsStateTable(
InternalKeyContext keyContext,
RegisteredKeyValueStateBackendMetaInfo metaInfo,
TypeSerializer keySerializer) {
super(keyContext, metaInfo, keySerializer);
}
@Override
protected NestedStateMap createStateMap() {
return new NestedStateMap<>();
}
// Snapshotting ----------------------------------------------------------------------------------------------------
@Nonnull
@Override
public NestedMapsStateTableSnapshot stateSnapshot() {
return new NestedMapsStateTableSnapshot<>(
this,
getKeySerializer(),
getNamespaceSerializer(),
getStateSerializer(),
getMetaInfo().getStateSnapshotTransformFactory().createForDeserializedState().orElse(null));
}
/**
* This class encapsulates the snapshot logic.
*
* @param type of key.
* @param type of namespace.
* @param type of state.
*/
static class NestedMapsStateTableSnapshot
extends AbstractStateTableSnapshot {
NestedMapsStateTableSnapshot(
NestedMapsStateTable owningTable,
TypeSerializer localKeySerializer,
TypeSerializer localNamespaceSerializer,
TypeSerializer localStateSerializer,
StateSnapshotTransformer stateSnapshotTransformer) {
super(owningTable,
localKeySerializer,
localNamespaceSerializer,
localStateSerializer,
stateSnapshotTransformer);
}
@Override
protected StateMapSnapshot> getStateMapSnapshotForKeyGroup(int keyGroup) {
NestedStateMap stateMap = (NestedStateMap) owningStateTable.getMapForKeyGroup(keyGroup);
return stateMap.stateSnapshot();
}
@Override
public void release() {
}
}
}