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• RegisteredKeyValueStateBackendMetaInfo.java

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org.apache.flink.runtime.state.RegisteredKeyValueStateBackendMetaInfo 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.state.StateDescriptor;
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.StateSnapshotTransformer.StateSnapshotTransformFactory;
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.HashMap;
import java.util.Map;
import java.util.Objects;

/**
 * Compound meta information for a registered state in a keyed state backend. This combines all serializers and the
 * state name.
 *
 * @param  Type of namespace
 * @param  Type of state value
 */
public class RegisteredKeyValueStateBackendMetaInfo extends RegisteredStateMetaInfoBase {

	@Nonnull
	private final StateDescriptor.Type stateType;
	@Nonnull
	private final StateSerializerProvider namespaceSerializerProvider;
	@Nonnull
	private final StateSerializerProvider stateSerializerProvider;
	@Nonnull
	private StateSnapshotTransformFactory stateSnapshotTransformFactory;

	public RegisteredKeyValueStateBackendMetaInfo(
		@Nonnull StateDescriptor.Type stateType,
		@Nonnull String name,
		@Nonnull TypeSerializer namespaceSerializer,
		@Nonnull TypeSerializer stateSerializer) {

		this(
			stateType,
			name,
			StateSerializerProvider.fromNewRegisteredSerializer(namespaceSerializer),
			StateSerializerProvider.fromNewRegisteredSerializer(stateSerializer),
			StateSnapshotTransformFactory.noTransform());
	}

	public RegisteredKeyValueStateBackendMetaInfo(
		@Nonnull StateDescriptor.Type stateType,
		@Nonnull String name,
		@Nonnull TypeSerializer namespaceSerializer,
		@Nonnull TypeSerializer stateSerializer,
		@Nonnull StateSnapshotTransformFactory stateSnapshotTransformFactory) {

		this(
			stateType,
			name,
			StateSerializerProvider.fromNewRegisteredSerializer(namespaceSerializer),
			StateSerializerProvider.fromNewRegisteredSerializer(stateSerializer),
			stateSnapshotTransformFactory);
	}

	@SuppressWarnings("unchecked")
	public RegisteredKeyValueStateBackendMetaInfo(@Nonnull StateMetaInfoSnapshot snapshot) {
		this(
			StateDescriptor.Type.valueOf(snapshot.getOption(StateMetaInfoSnapshot.CommonOptionsKeys.KEYED_STATE_TYPE)),
			snapshot.getName(),
			StateSerializerProvider.fromPreviousSerializerSnapshot(
				(TypeSerializerSnapshot) Preconditions.checkNotNull(
					snapshot.getTypeSerializerSnapshot(StateMetaInfoSnapshot.CommonSerializerKeys.NAMESPACE_SERIALIZER))),
			StateSerializerProvider.fromPreviousSerializerSnapshot(
				(TypeSerializerSnapshot) Preconditions.checkNotNull(
					snapshot.getTypeSerializerSnapshot(StateMetaInfoSnapshot.CommonSerializerKeys.VALUE_SERIALIZER))),
			StateSnapshotTransformFactory.noTransform());

		Preconditions.checkState(StateMetaInfoSnapshot.BackendStateType.KEY_VALUE == snapshot.getBackendStateType());
	}

	private RegisteredKeyValueStateBackendMetaInfo(
		@Nonnull StateDescriptor.Type stateType,
		@Nonnull String name,
		@Nonnull StateSerializerProvider namespaceSerializerProvider,
		@Nonnull StateSerializerProvider stateSerializerProvider,
		@Nonnull StateSnapshotTransformFactory stateSnapshotTransformFactory) {

		super(name);
		this.stateType = stateType;
		this.namespaceSerializerProvider = namespaceSerializerProvider;
		this.stateSerializerProvider = stateSerializerProvider;
		this.stateSnapshotTransformFactory = stateSnapshotTransformFactory;
	}

	@Nonnull
	public StateDescriptor.Type getStateType() {
		return stateType;
	}

	@Nonnull
	public TypeSerializer getNamespaceSerializer() {
		return namespaceSerializerProvider.currentSchemaSerializer();
	}

	@Nonnull
	public TypeSerializerSchemaCompatibility updateNamespaceSerializer(TypeSerializer newNamespaceSerializer) {
		return namespaceSerializerProvider.registerNewSerializerForRestoredState(newNamespaceSerializer);
	}

	@Nullable
	public TypeSerializer getPreviousNamespaceSerializer() {
		return namespaceSerializerProvider.previousSchemaSerializer();
	}

	@Nonnull
	public TypeSerializer getStateSerializer() {
		return stateSerializerProvider.currentSchemaSerializer();
	}

	@Nonnull
	public TypeSerializerSchemaCompatibility updateStateSerializer(TypeSerializer newStateSerializer) {
		return stateSerializerProvider.registerNewSerializerForRestoredState(newStateSerializer);
	}

	@Nullable
	public TypeSerializer getPreviousStateSerializer() {
		return stateSerializerProvider.previousSchemaSerializer();
	}

	@Nullable
	public TypeSerializerSnapshot getPreviousStateSerializerSnapshot() {
		return stateSerializerProvider.previousSerializerSnapshot;
	}

	@Nonnull
	public StateSnapshotTransformFactory getStateSnapshotTransformFactory() {
		return stateSnapshotTransformFactory;
	}

	public void updateSnapshotTransformFactory(StateSnapshotTransformFactory stateSnapshotTransformFactory) {
		this.stateSnapshotTransformFactory = stateSnapshotTransformFactory;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}

		if (o == null || getClass() != o.getClass()) {
			return false;
		}

		RegisteredKeyValueStateBackendMetaInfo that = (RegisteredKeyValueStateBackendMetaInfo) o;

		if (!stateType.equals(that.stateType)) {
			return false;
		}

		if (!getName().equals(that.getName())) {
			return false;
		}

		return getStateSerializer().equals(that.getStateSerializer())
				&& getNamespaceSerializer().equals(that.getNamespaceSerializer());
	}

	@Override
	public String toString() {
		return "RegisteredKeyedBackendStateMetaInfo{" +
				"stateType=" + stateType +
				", name='" + name + '\'' +
				", namespaceSerializer=" + getNamespaceSerializer() +
				", stateSerializer=" + getStateSerializer() +
				'}';
	}

	@Override
	public int hashCode() {
		int result = getName().hashCode();
		result = 31 * result + getStateType().hashCode();
		result = 31 * result + getNamespaceSerializer().hashCode();
		result = 31 * result + getStateSerializer().hashCode();
		return result;
	}

	@Nonnull
	@Override
	public StateMetaInfoSnapshot snapshot() {
		return computeSnapshot();
	}

	public void checkStateMetaInfo(StateDescriptor stateDesc) {

		Preconditions.checkState(
			Objects.equals(stateDesc.getName(), getName()),
			"Incompatible state names. " +
				"Was [" + getName() + "], " +
				"registered with [" + stateDesc.getName() + "].");

		if (stateDesc.getType() != StateDescriptor.Type.UNKNOWN && getStateType() != StateDescriptor.Type.UNKNOWN) {
			Preconditions.checkState(
				stateDesc.getType() == getStateType(),
				"Incompatible key/value state types. " +
					"Was [" + getStateType() + "], " +
					"registered with [" + stateDesc.getType() + "].");
		}
	}

	@Nonnull
	private StateMetaInfoSnapshot computeSnapshot() {
		Map optionsMap = Collections.singletonMap(
			StateMetaInfoSnapshot.CommonOptionsKeys.KEYED_STATE_TYPE.toString(),
			stateType.toString());
		Map> serializerMap = new HashMap<>(2);
		Map> serializerConfigSnapshotsMap = new HashMap<>(2);
		String namespaceSerializerKey = StateMetaInfoSnapshot.CommonSerializerKeys.NAMESPACE_SERIALIZER.toString();
		String valueSerializerKey = StateMetaInfoSnapshot.CommonSerializerKeys.VALUE_SERIALIZER.toString();

		TypeSerializer namespaceSerializer = getNamespaceSerializer();
		serializerMap.put(namespaceSerializerKey, namespaceSerializer.duplicate());
		serializerConfigSnapshotsMap.put(namespaceSerializerKey, namespaceSerializer.snapshotConfiguration());

		TypeSerializer stateSerializer = getStateSerializer();
		serializerMap.put(valueSerializerKey, stateSerializer.duplicate());
		serializerConfigSnapshotsMap.put(valueSerializerKey, stateSerializer.snapshotConfiguration());

		return new StateMetaInfoSnapshot(
			name,
			StateMetaInfoSnapshot.BackendStateType.KEY_VALUE,
			optionsMap,
			serializerConfigSnapshotsMap,
			serializerMap);
	}
}