| /* |
| * 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.query; |
| |
| import org.apache.flink.api.common.typeutils.TypeSerializer; |
| import org.apache.flink.runtime.state.internal.InternalKvState; |
| import org.apache.flink.util.Preconditions; |
| |
| import java.util.Objects; |
| |
| /** |
| * Metadata about a {@link InternalKvState}. This includes the serializers for |
| * the key, the namespace, and the values kept in the state. |
| * |
| * @param <K> The type of key the state is associated to |
| * @param <N> The type of the namespace the state is associated to |
| * @param <V> The type of values kept internally in state |
| */ |
| public class KvStateInfo<K, N, V> { |
| |
| private final TypeSerializer<K> keySerializer; |
| private final TypeSerializer<N> namespaceSerializer; |
| private final TypeSerializer<V> stateValueSerializer; |
| |
| public KvStateInfo( |
| final TypeSerializer<K> keySerializer, |
| final TypeSerializer<N> namespaceSerializer, |
| final TypeSerializer<V> stateValueSerializer |
| ) { |
| this.keySerializer = Preconditions.checkNotNull(keySerializer); |
| this.namespaceSerializer = Preconditions.checkNotNull(namespaceSerializer); |
| this.stateValueSerializer = Preconditions.checkNotNull(stateValueSerializer); |
| } |
| |
| /** |
| * @return The serializer for the key the state is associated to. |
| */ |
| public TypeSerializer<K> getKeySerializer() { |
| return keySerializer; |
| } |
| |
| /** |
| * @return The serializer for the namespace the state is associated to. |
| */ |
| public TypeSerializer<N> getNamespaceSerializer() { |
| return namespaceSerializer; |
| } |
| |
| /** |
| * @return The serializer for the values kept in the state. |
| */ |
| public TypeSerializer<V> getStateValueSerializer() { |
| return stateValueSerializer; |
| } |
| |
| /** |
| * Creates a deep copy of the current {@link KvStateInfo} by duplicating |
| * all the included serializers. |
| * |
| * <p>This method assumes correct implementation of the {@link TypeSerializer#duplicate()} |
| * method of the included serializers. |
| */ |
| public KvStateInfo<K, N, V> duplicate() { |
| final TypeSerializer<K> dupKeySerializer = keySerializer.duplicate(); |
| final TypeSerializer<N> dupNamespaceSerializer = namespaceSerializer.duplicate(); |
| final TypeSerializer<V> dupSVSerializer = stateValueSerializer.duplicate(); |
| |
| if ( |
| dupKeySerializer == keySerializer && |
| dupNamespaceSerializer == namespaceSerializer && |
| dupSVSerializer == stateValueSerializer |
| ) { |
| return this; |
| } |
| |
| return new KvStateInfo<>(dupKeySerializer, dupNamespaceSerializer, dupSVSerializer); |
| |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| KvStateInfo<?, ?, ?> stateInfo = (KvStateInfo<?, ?, ?>) o; |
| return Objects.equals(keySerializer, stateInfo.keySerializer) && |
| Objects.equals(namespaceSerializer, stateInfo.namespaceSerializer) && |
| Objects.equals(stateValueSerializer, stateInfo.stateValueSerializer); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(keySerializer, namespaceSerializer, stateValueSerializer); |
| } |
| } |