/*
* 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.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.state.internal.InternalValueState;
/**
* Heap-backed partitioned {@link org.apache.flink.api.common.state.ValueState} that is snapshotted
* into files.
*
* @param <K> The type of the key.
* @param <N> The type of the namespace.
* @param <V> The type of the value.
*/
public class HeapValueState<K, N, V>
extends AbstractHeapState<K, N, V, ValueState<V>, ValueStateDescriptor<V>>
implements InternalValueState<N, V> {
/**
* Creates a new key/value state for the given hash map of key/value pairs.
*
* @param stateDesc The state identifier for the state. This contains name
* and can create a default state value.
* @param stateTable The state tab;e to use in this kev/value state. May contain initial state.
*/
public HeapValueState(
ValueStateDescriptor<V> stateDesc,
StateTable<K, N, V> stateTable,
TypeSerializer<K> keySerializer,
TypeSerializer<N> namespaceSerializer) {
super(stateDesc, stateTable, keySerializer, namespaceSerializer);
}
@Override
public V value() {
final V result = stateTable.get(currentNamespace);
if (result == null) {
return stateDesc.getDefaultValue();
}
return result;
}
@Override
public void update(V value) {
if (value == null) {
clear();
return;
}
stateTable.put(currentNamespace, value);
}
}