org.apache.flink.runtime.state.heap.HeapValueState 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.heap;
import org.apache.flink.api.common.state.State;
import org.apache.flink.api.common.state.StateDescriptor;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.state.internal.InternalValueState;
/**
* Heap-backed partitioned {@link ValueState} that is snapshotted into files.
*
* @param The type of the key.
* @param The type of the namespace.
* @param The type of the value.
*/
class HeapValueState
extends AbstractHeapState
implements InternalValueState {
/**
* Creates a new key/value state for the given hash map of key/value pairs.
*
* @param stateTable The state table for which this state is associated to.
* @param keySerializer The serializer for the keys.
* @param valueSerializer The serializer for the state.
* @param namespaceSerializer The serializer for the namespace.
* @param defaultValue The default value for the state.
*/
private HeapValueState(
StateTable stateTable,
TypeSerializer keySerializer,
TypeSerializer valueSerializer,
TypeSerializer namespaceSerializer,
V defaultValue) {
super(stateTable, keySerializer, valueSerializer, namespaceSerializer, defaultValue);
}
@Override
public TypeSerializer getKeySerializer() {
return keySerializer;
}
@Override
public TypeSerializer getNamespaceSerializer() {
return namespaceSerializer;
}
@Override
public TypeSerializer getValueSerializer() {
return valueSerializer;
}
@Override
public V value() {
final V result = stateTable.get(currentNamespace);
if (result == null) {
return getDefaultValue();
}
return result;
}
@Override
public void update(V value) {
if (value == null) {
clear();
return;
}
stateTable.put(currentNamespace, value);
}
@SuppressWarnings("unchecked")
static IS create(
StateDescriptor stateDesc,
StateTable stateTable,
TypeSerializer keySerializer) {
return (IS) new HeapValueState<>(
stateTable,
keySerializer,
stateTable.getStateSerializer(),
stateTable.getNamespaceSerializer(),
stateDesc.getDefaultValue());
}
}