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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.memory;
import org.apache.flink.api.common.functions.ReduceFunction;
import org.apache.flink.api.common.state.ReducingState;
import org.apache.flink.api.common.state.ReducingStateDescriptor;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.state.KvState;
import org.apache.flink.runtime.state.KvStateSnapshot;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* Heap-backed partitioned {@link org.apache.flink.api.common.state.ReducingState} that is
* snapshotted into a serialized memory copy.
*
* @param The type of the key.
* @param The type of the namespace.
* @param The type of the values in the list state.
*/
public class MemReducingState
extends AbstractMemState, ReducingStateDescriptor>
implements ReducingState {
private final ReduceFunction reduceFunction;
public MemReducingState(TypeSerializer keySerializer,
TypeSerializer namespaceSerializer,
ReducingStateDescriptor stateDesc) {
super(keySerializer, namespaceSerializer, stateDesc.getSerializer(), stateDesc);
this.reduceFunction = stateDesc.getReduceFunction();
}
public MemReducingState(TypeSerializer keySerializer,
TypeSerializer namespaceSerializer,
ReducingStateDescriptor stateDesc,
HashMap> state) {
super(keySerializer, namespaceSerializer, stateDesc.getSerializer(), stateDesc, state);
this.reduceFunction = stateDesc.getReduceFunction();
}
@Override
public V get() {
if (currentNSState == null) {
currentNSState = state.get(currentNamespace);
}
if (currentNSState != null) {
return currentNSState.get(currentKey);
}
return null;
}
@Override
public void add(V value) throws IOException {
if (currentKey == null) {
throw new RuntimeException("No key available.");
}
if (currentNSState == null) {
currentNSState = new HashMap<>();
state.put(currentNamespace, currentNSState);
}
// currentKeyState.merge(currentNamespace, value, new BiFunction() {
// @Override
// public V apply(V v, V v2) {
// try {
// return reduceFunction.reduce(v, v2);
// } catch (Exception e) {
// return null;
// }
// }
// });
V currentValue = currentNSState.get(currentKey);
if (currentValue == null) {
currentNSState.put(currentKey, value);
} else {
try {
currentNSState.put(currentKey, reduceFunction.reduce(currentValue, value));
} catch (Exception e) {
throw new RuntimeException("Could not add value to reducing state.", e);
}
}
}
@Override
public KvStateSnapshot, ReducingStateDescriptor, MemoryStateBackend> createHeapSnapshot(byte[] bytes) {
return new Snapshot<>(getKeySerializer(), getNamespaceSerializer(), stateSerializer, stateDesc, bytes);
}
public static class Snapshot extends AbstractMemStateSnapshot, ReducingStateDescriptor> {
private static final long serialVersionUID = 1L;
public Snapshot(TypeSerializer keySerializer,
TypeSerializer namespaceSerializer,
TypeSerializer stateSerializer,
ReducingStateDescriptor stateDescs, byte[] data) {
super(keySerializer, namespaceSerializer, stateSerializer, stateDescs, data);
}
@Override
public KvState, ReducingStateDescriptor, MemoryStateBackend> createMemState(HashMap> stateMap) {
return new MemReducingState<>(keySerializer, namespaceSerializer, stateDesc, stateMap);
}
}}
