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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.filesystem;
import org.apache.flink.api.common.functions.FoldFunction;
import org.apache.flink.api.common.state.FoldingState;
import org.apache.flink.api.common.state.FoldingStateDescriptor;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.fs.Path;
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 FoldingState} that is
* snapshotted into files.
*
* @param The type of the key.
* @param The type of the namespace.
* @param The type of the values that can be folded into the state.
* @param The type of the value in the folding state.
*/
public class FsFoldingState
extends AbstractFsState, FoldingStateDescriptor>
implements FoldingState {
private final FoldFunction foldFunction;
/**
* Creates a new and empty partitioned state.
*
* @param backend The file system state backend backing snapshots of this state
* @param keySerializer The serializer for the key.
* @param namespaceSerializer The serializer for the namespace.
* @param stateDesc The state identifier for the state. This contains name
* and can create a default state value.
*/
public FsFoldingState(FsStateBackend backend,
TypeSerializer keySerializer,
TypeSerializer namespaceSerializer,
FoldingStateDescriptor stateDesc) {
super(backend, keySerializer, namespaceSerializer, stateDesc.getSerializer(), stateDesc);
this.foldFunction = stateDesc.getFoldFunction();
}
/**
* Creates a new key/value state with the given state contents.
* This method is used to re-create key/value state with existing data, for example from
* a snapshot.
*
* @param backend The file system state backend backing snapshots of this state
* @param keySerializer The serializer for the key.
* @param namespaceSerializer The serializer for the namespace.
* @param stateDesc The state identifier for the state. This contains name
* and can create a default state value.
* @param state The map of key/value pairs to initialize the state with.
*/
public FsFoldingState(FsStateBackend backend,
TypeSerializer keySerializer,
TypeSerializer namespaceSerializer,
FoldingStateDescriptor stateDesc,
HashMap> state) {
super(backend, keySerializer, namespaceSerializer, stateDesc.getSerializer(), stateDesc, state);
this.foldFunction = stateDesc.getFoldFunction();
}
@Override
public ACC get() {
if (currentNSState == null) {
currentNSState = state.get(currentNamespace);
}
return currentNSState != null ?
currentNSState.get(currentKey) : null;
}
@Override
public void add(T value) throws IOException {
if (currentKey == null) {
throw new RuntimeException("No key available.");
}
if (currentNSState == null) {
currentNSState = new HashMap<>();
state.put(currentNamespace, currentNSState);
}
ACC currentValue = currentNSState.get(currentKey);
try {
if (currentValue == null) {
currentNSState.put(currentKey, foldFunction.fold(stateDesc.getDefaultValue(), value));
} else {
currentNSState.put(currentKey, foldFunction.fold(currentValue, value));
}
} catch (Exception e) {
throw new RuntimeException("Could not add value to folding state.", e);
}
}
@Override
public KvStateSnapshot, FoldingStateDescriptor, FsStateBackend> createHeapSnapshot(Path filePath) {
return new Snapshot<>(getKeySerializer(), getNamespaceSerializer(), stateSerializer, stateDesc, filePath);
}
public static class Snapshot extends AbstractFsStateSnapshot, FoldingStateDescriptor> {
private static final long serialVersionUID = 1L;
public Snapshot(TypeSerializer keySerializer,
TypeSerializer namespaceSerializer,
TypeSerializer stateSerializer,
FoldingStateDescriptor stateDescs,
Path filePath) {
super(keySerializer, namespaceSerializer, stateSerializer, stateDescs, filePath);
}
@Override
public KvState, FoldingStateDescriptor, FsStateBackend> createFsState(FsStateBackend backend, HashMap> stateMap) {
return new FsFoldingState<>(backend, keySerializer, namespaceSerializer, stateDesc, stateMap);
}
}
}