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org.apache.flink.runtime.state.subkeyed.AbstractSubKeyedMapStateImpl 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.subkeyed;
import org.apache.flink.api.common.functions.HashPartitioner;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.base.MapSerializer;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.core.memory.ByteArrayOutputStreamWithPos;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
import org.apache.flink.queryablestate.client.state.serialization.KvStateSerializer;
import org.apache.flink.runtime.state.AbstractInternalStateBackend;
import org.apache.flink.runtime.state.BatchPutWrapper;
import org.apache.flink.runtime.state.StateAccessException;
import org.apache.flink.runtime.state.StateSerializerUtil;
import org.apache.flink.runtime.state.StateStorage;
import org.apache.flink.runtime.state.StorageInstance;
import org.apache.flink.runtime.state.StorageIterator;
import org.apache.flink.runtime.state.heap.HeapStateStorage;
import org.apache.flink.runtime.state.heap.internal.StateTable;
import org.apache.flink.types.Pair;
import org.apache.flink.util.Preconditions;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import static org.apache.flink.runtime.state.StateSerializerUtil.serializeGroupPrefix;
/**
* The base implementation of {@link AbstractSubKeyedMapState} backed by an a state storage.
* The pairs in the storage are formatted as {(K, N, MK) -> MV}. Because the pairs are
* partitioned by K, the mappings under the same key will be assigned to the same group and
* can be easily retrieved with the prefix iterator on the key.
*
* @param Type of the keys in the state.
* @param Type of the namespaces in the state.
* @param Type of the map keys in the state.
* @param Type of the map values in the state.
* @param Type of the maps in the state.
*/
abstract class AbstractSubKeyedMapStateImpl> implements AbstractSubKeyedMapState {
/**
* The state storage where the values are stored.
*/
protected final StateStorage stateStorage;
/**
* Serialized state name of current state.
*/
protected byte[] stateNameByte;
protected byte[] stateNameForSerialize;
protected int serializedStateNameLength;
/**
* The key serializer of current state.
*/
protected TypeSerializer keySerializer;
/**
* Serializer for map key of current state.
*/
protected TypeSerializer mapKeySerializer;
/**
* Serializer for map value of current state.
*/
protected TypeSerializer mapValueSerializer;
/**
* Serializer for namespace of current state.
*/
protected TypeSerializer namespaceSerializer;
/**
* State backend who creates the current state.
*/
private AbstractInternalStateBackend internalStateBackend;
protected ByteArrayOutputStreamWithPos outputStream = new ByteArrayOutputStreamWithPos();
protected DataOutputView outputView = new DataOutputViewStreamWrapper(outputStream);
/** partitioner used to get key group.**/
protected final HashPartitioner partitioner = HashPartitioner.INSTANCE;
//--------------------------------------------------------------------------
/**
* Constructor with the state storage to store mappings.
*
* @param stateStorage The state storage where the values are stored.
*/
AbstractSubKeyedMapStateImpl(
AbstractInternalStateBackend backend,
StateStorage stateStorage) {
this.internalStateBackend = Preconditions.checkNotNull(backend);
this.stateStorage = Preconditions.checkNotNull(stateStorage);
}
/**
* Creates a map under a key.
*
* @return A map under a key.
*/
abstract M createMap();
//--------------------------------------------------------------------------
@Override
public boolean contains(K key, N namespace, MK mapKey) {
if (key == null || namespace == null) {
return false;
}
try {
if (stateStorage.lazySerde()) {
Map map = get(key, namespace);
return map != null && map.containsKey(mapKey);
} else {
outputStream.reset();
byte[] serializedKey = StateSerializerUtil.getSerializedKeyForSubKeyedMapState(
outputStream,
outputView,
key,
keySerializer,
namespace,
namespaceSerializer,
mapKey,
mapKeySerializer,
getKeyGroup(key),
stateNameForSerialize);
return stateStorage.get(serializedKey) != null;
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public boolean contains(K key, N namespace) {
if (key == null || namespace == null) {
return false;
}
if (stateStorage.lazySerde()) {
Map map = get(key, namespace);
return map != null;
} else {
Iterator> iterator = iterator(key, namespace);
return iterator.hasNext();
}
}
@Override
public MV get(K key, N namespace, MK mapKey) {
return getOrDefault(key, namespace, mapKey, null);
}
@SuppressWarnings("unchecked")
@Override
public MV getOrDefault(K key, N namespace, MK mapKey, MV defaultMapValue) {
if (key == null || namespace == null) {
return defaultMapValue;
}
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
if (map == null) {
return defaultMapValue;
}
MV value = map.get(mapKey);
return value == null ? defaultMapValue : value;
} else {
outputStream.reset();
byte[] serializedKey = StateSerializerUtil.getSerializedKeyForSubKeyedMapState(
outputStream,
outputView,
key,
keySerializer,
namespace,
namespaceSerializer,
mapKey,
mapKeySerializer,
getKeyGroup(key),
stateNameForSerialize);
byte[] serializedValue = (byte[]) stateStorage.get(serializedKey);
if (serializedValue == null) {
return defaultMapValue;
} else {
return StateSerializerUtil.getDeserializeSingleValue(serializedValue, mapValueSerializer);
}
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public M get(K key, N namespace) {
return getOrDefault(key, namespace, null);
}
@Override
public M getOrDefault(K key, N namespace, M defaultMap) {
if (key == null || namespace == null) {
return defaultMap;
}
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
M map = (M) heapStateStorage.get(key);
return map == null ? defaultMap : map;
} else {
Iterator> iterator = iterator(key, namespace);
M result = createMap();
while (iterator.hasNext()) {
Map.Entry entry = iterator.next();
result.put(entry.getKey(), entry.getValue());
}
return result.isEmpty() ? defaultMap : result;
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@SuppressWarnings("unchecked")
@Override
public M getAll(K key, N namespace, Collection mapKeys) {
if (key == null || namespace == null || mapKeys == null || mapKeys.isEmpty()) {
return null;
}
try {
if (stateStorage.lazySerde()) {
M map = get(key, namespace);
if (map == null) {
return null;
}
// lazy create
M results = null;
for (MK mapKey : mapKeys) {
MV value = map.get(mapKey);
if (value != null) {
if (results == null) {
results = createMap();
}
results.put(mapKey, value);
}
}
return results;
} else {
M result = createMap();
outputStream.reset();
StateSerializerUtil.getSerializedPrefixKeyForSubKeyedState(
outputStream,
outputView,
key,
keySerializer,
namespace,
namespaceSerializer,
getKeyGroup(key),
stateNameForSerialize);
int prefixLength = outputStream.getPosition();
for (MK mapKey : mapKeys) {
if (mapKey != null) {
outputStream.setPosition(prefixLength);
StateSerializerUtil.serializeItemWithKeyPrefix(outputView, mapKey, mapKeySerializer);
byte[] byteValue = (byte[]) stateStorage.get(outputStream.toByteArray());
if (byteValue != null) {
MV value = StateSerializerUtil.getDeserializeSingleValue(byteValue, mapValueSerializer);
result.put(mapKey, value);
}
}
}
return result.isEmpty() ? null : result;
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@SuppressWarnings("unchecked")
@Override
public Map getAll(K key) {
if (key == null) {
return Collections.emptyMap();
}
try {
if (stateStorage.lazySerde()) {
return ((HeapStateStorage) stateStorage).getAll(key);
} else {
outputStream.reset();
byte[] prefix = StateSerializerUtil.getSerializedPrefixKeyForSubKeyedState(
outputStream,
outputView,
key,
keySerializer,
null,
namespaceSerializer,
getKeyGroup(key),
stateNameForSerialize);
StorageIterator iterator = stateStorage.prefixIterator(prefix);
Map result = new HashMap<>();
while (iterator.hasNext()) {
Pair pair = iterator.next();
N namespace = StateSerializerUtil.getDeserializedNamespcae(
pair.getKey(),
keySerializer,
namespaceSerializer,
serializedStateNameLength);
MK mapKey = StateSerializerUtil.getDeserializedMapKeyForSubKeyedMapState(
pair.getKey(),
keySerializer,
namespaceSerializer,
mapKeySerializer,
serializedStateNameLength);
MV mapValue = StateSerializerUtil.getDeserializeSingleValue(pair.getValue(), mapValueSerializer);
M innerMap = result.get(namespace);
if (innerMap == null) {
innerMap = createMap();
result.put(namespace, innerMap);
}
innerMap.put(mapKey, mapValue);
}
return result;
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public void add(K key, N namespace, MK mapKey, MV mapValue) {
Preconditions.checkNotNull(key);
Preconditions.checkNotNull(namespace);
Preconditions.checkNotNull(mapKey);
Preconditions.checkNotNull(mapValue);
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
if (map == null) {
map = createMap();
heapStateStorage.put(key, map);
}
map.put(mapKey, mapValue);
} else {
outputStream.reset();
byte[] serializedKey = StateSerializerUtil.getSerializedKeyForSubKeyedMapState(
outputStream,
outputView,
key,
keySerializer,
namespace,
namespaceSerializer,
mapKey,
mapKeySerializer,
getKeyGroup(key),
stateNameForSerialize);
outputStream.reset();
mapValueSerializer.serialize(mapValue, outputView);
byte[] serializedValue = outputStream.toByteArray();
stateStorage.put(serializedKey, serializedValue);
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public void addAll(K key, N namespace, Map mappings) {
Preconditions.checkNotNull(key);
Preconditions.checkNotNull(namespace);
if (mappings == null || mappings.isEmpty()) {
return;
}
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
if (map == null) {
map = createMap();
heapStateStorage.put(key, map);
}
map.putAll(mappings);
} else {
StorageInstance instance = stateStorage.getStorageInstance();
try (BatchPutWrapper batchPutWrapper = instance.getBatchPutWrapper()) {
outputStream.reset();
StateSerializerUtil.getSerializedPrefixKeyForSubKeyedState(
outputStream,
outputView,
key,
keySerializer,
namespace,
namespaceSerializer,
getKeyGroup(key),
stateNameForSerialize);
int prefixLength = outputStream.getPosition();
ByteArrayOutputStreamWithPos valueOutputStream = new ByteArrayOutputStreamWithPos();
DataOutputView valueOutputView = new DataOutputViewStreamWrapper(valueOutputStream);
for (Map.Entry entry : mappings.entrySet()) {
Preconditions.checkNotNull(entry.getKey(), "Can not insert null key to mapstate");
Preconditions.checkNotNull(entry.getValue(), "Can not insert null value to mapstate");
outputStream.setPosition(prefixLength);
StateSerializerUtil.serializeItemWithKeyPrefix(outputView, entry.getKey(), mapKeySerializer);
byte[] byteKey = outputStream.toByteArray();
valueOutputStream.reset();
mapValueSerializer.serialize(entry.getValue(), valueOutputView);
byte[] byteValue = valueOutputStream.toByteArray();
batchPutWrapper.put(byteKey, byteValue);
}
}
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public void remove(K key, N namespace) {
if (key == null || namespace == null) {
return;
}
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
heapStateStorage.remove(key);
} else {
Iterator> iterator = iterator(key, namespace);
while (iterator.hasNext()) {
iterator.next();
iterator.remove();
}
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public void remove(K key, N namespace, MK mapKey) {
if (key == null || namespace == null) {
return;
}
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
if (map != null) {
map.remove(mapKey);
if (map.isEmpty()) {
heapStateStorage.remove(key);
}
}
} else {
outputStream.reset();
byte[] serializedKey = StateSerializerUtil.getSerializedKeyForSubKeyedMapState(
outputStream,
outputView,
key,
keySerializer,
namespace,
namespaceSerializer,
mapKey,
mapKeySerializer,
getKeyGroup(key),
stateNameForSerialize);
stateStorage.remove(serializedKey);
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public void removeAll(K key, N namespace, Collection mapKeys) {
if (key == null || namespace == null || mapKeys.isEmpty()) {
return;
}
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
if (map != null) {
for (MK mk : mapKeys) {
map.remove(mk);
}
if (map.isEmpty()) {
heapStateStorage.remove(key);
}
}
} else {
outputStream.reset();
StateSerializerUtil.getSerializedPrefixKeyForSubKeyedState(
outputStream,
outputView,
key,
keySerializer,
namespace,
namespaceSerializer,
getKeyGroup(key),
stateNameForSerialize);
int prefixLength = outputStream.getPosition();
for (MK mapKey : mapKeys) {
outputStream.setPosition(prefixLength);
StateSerializerUtil.serializeItemWithKeyPrefix(outputView, mapKey, mapKeySerializer);
stateStorage.remove(outputStream.toByteArray());
}
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public void removeAll(K key) {
if (key == null) {
return;
}
if (stateStorage.lazySerde()) {
((HeapStateStorage) stateStorage).removeAll(key);
} else {
try {
outputStream.reset();
byte[] prefix = StateSerializerUtil.getSerializedPrefixKeyForSubKeyedState(
outputStream,
outputView,
key,
keySerializer,
null,
namespaceSerializer,
getKeyGroup(key),
stateNameForSerialize);
StorageIterator iterator = stateStorage.prefixIterator(prefix);
while (iterator.hasNext()) {
stateStorage.remove(iterator.next().getKey());
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
}
@Override
public Iterator> iterator(K key, N namespace) {
Preconditions.checkNotNull(key);
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
return map == null ? Collections.emptyIterator() : map.entrySet().iterator();
} else {
return getDeSerializedIterator(
key, namespace, outputStream, outputView, keySerializer, namespaceSerializer, mapKeySerializer, mapValueSerializer);
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public Iterable> entries(K key, N namespace) {
Preconditions.checkNotNull(key);
Preconditions.checkNotNull(namespace);
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
return map == null ? Collections.emptySet() : map.entrySet();
} else {
return new Iterable>() {
@Override
public Iterator> iterator() {
final Iterator> innerIter = AbstractSubKeyedMapStateImpl.this.iterator(key, namespace);
return new Iterator>() {
@Override
public boolean hasNext() {
return innerIter.hasNext();
}
@Override
public Map.Entry next() {
return innerIter.next();
}
@Override
public void remove() {
innerIter.remove();
}
};
}
};
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public Iterable keys(K key, N namespace) {
Preconditions.checkNotNull(key);
Preconditions.checkNotNull(namespace);
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
return map == null ? Collections.emptySet() : map.keySet();
} else {
return new Iterable() {
@Override
public Iterator iterator() {
final Iterator> innerIter = AbstractSubKeyedMapStateImpl.this.iterator(key, namespace);
return new Iterator() {
@Override
public boolean hasNext() {
return innerIter.hasNext();
}
@Override
public MK next() {
return innerIter.next().getKey();
}
@Override
public void remove() {
innerIter.remove();
}
};
}
};
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public Iterable values(K key, N namespace) {
Preconditions.checkNotNull(key);
Preconditions.checkNotNull(namespace);
try {
if (stateStorage.lazySerde()) {
HeapStateStorage heapStateStorage = (HeapStateStorage) stateStorage;
heapStateStorage.setCurrentNamespace(namespace);
Map map = (Map) heapStateStorage.get(key);
return map == null ? Collections.emptySet() : map.values();
} else {
return new Iterable() {
@Override
public Iterator iterator() {
final Iterator> innerIter = AbstractSubKeyedMapStateImpl.this.iterator(key, namespace);
return new Iterator() {
@Override
public boolean hasNext() {
return innerIter.hasNext();
}
@Override
public MV next() {
return innerIter.next().getValue();
}
@Override
public void remove() {
innerIter.remove();
}
};
}
};
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public Iterator iterator(K key) {
Preconditions.checkNotNull(key);
if (stateStorage.lazySerde()) {
return ((HeapStateStorage) stateStorage).namespaceIterator(key);
} else {
try {
outputStream.reset();
byte[] prefix = StateSerializerUtil.getSerializedPrefixKeyForSubKeyedState(
outputStream,
outputView,
key,
keySerializer,
null,
namespaceSerializer,
getKeyGroup(key),
stateNameForSerialize);
StorageIterator iterator = stateStorage.prefixIterator(prefix);
//TODO: Load the namespace in lazy style for better performance.
Set namespaceSet = new HashSet<>();
try {
while (iterator.hasNext()) {
namespaceSet.add(StateSerializerUtil.getDeserializedNamespcae(
iterator.next().getKey(),
keySerializer,
namespaceSerializer,
serializedStateNameLength));
}
} catch (Exception e) {
throw new StateAccessException(e);
}
Iterator namespaceIterator = namespaceSet.iterator();
return new Iterator() {
private N namespace = null;
@Override
public boolean hasNext() {
return namespaceIterator.hasNext();
}
@Override
public N next() {
namespace = namespaceIterator.next();
return namespace;
}
@Override
public void remove() {
if (namespace == null) {
throw new IllegalStateException();
}
namespaceIterator.remove();
AbstractSubKeyedMapStateImpl.this.remove(key, namespace);
}
};
} catch (Exception e) {
throw new StateAccessException(e);
}
}
}
@SuppressWarnings("unchecked")
@Override
public Iterable keys(N namespace) {
Preconditions.checkNotNull(namespace, "Do not support null as namespace.");
Set keys = new HashSet<>();
if (stateStorage.lazySerde()) {
StateTable stateTable = ((HeapStateStorage) stateStorage).getStateTable();
keys = (Set) stateTable.getKeys(namespace).collect(Collectors.toSet());
} else {
try {
for (int group : internalStateBackend.getKeyGroupRange()) {
outputStream.reset();
serializeGroupPrefix(outputStream, group, stateNameForSerialize);
StorageIterator iterator = stateStorage.prefixIterator(outputStream.toByteArray());
while (iterator.hasNext()) {
Pair pair = iterator.next();
Pair keyAndNamespace =
StateSerializerUtil.getDeserializedKeyAndNamespace(
pair.getKey(),
keySerializer,
namespaceSerializer,
serializedStateNameLength);
if (namespace.equals(keyAndNamespace.getValue())) {
keys.add(keyAndNamespace.getKey());
}
}
}
} catch (Exception e) {
throw new StateAccessException(e);
}
}
return keys.isEmpty() ? null : keys;
}
@Override
public byte[] getSerializedValue(byte[] serializedKeyAndNamespace, TypeSerializer safeKeySerializer, TypeSerializer safeNamespaceSerializer, TypeSerializer safeValueSerializer) throws Exception {
Tuple2 keyAndNamespace = KvStateSerializer.deserializeKeyAndNamespace(serializedKeyAndNamespace, safeKeySerializer, safeNamespaceSerializer);
K key = keyAndNamespace.f0;
N namespace = keyAndNamespace.f1;
MapSerializer mapSerializer = (MapSerializer) safeValueSerializer;
final TypeSerializer dupUserKeySerializer = mapSerializer.getKeySerializer();
final TypeSerializer dupUserValueSerializer = mapSerializer.getValueSerializer();
M result;
if (stateStorage.lazySerde()) {
result = get(key, namespace);
if (result == null) {
return null;
}
} else {
ByteArrayOutputStreamWithPos baos = new ByteArrayOutputStreamWithPos();
DataOutputViewStreamWrapper view = new DataOutputViewStreamWrapper(baos);
Iterator> iterator = getDeSerializedIterator(
key,
namespace,
baos,
view,
safeKeySerializer,
safeNamespaceSerializer,
dupUserKeySerializer,
dupUserValueSerializer);
result = createMap();
while (iterator.hasNext()) {
Map.Entry entry = iterator.next();
if (entry.getKey() != null && entry.getValue() != null) {
result.put(entry.getKey(), entry.getValue());
}
}
if (result.isEmpty()) {
return null;
}
}
return KvStateSerializer.serializeMap(result.entrySet(), dupUserKeySerializer, dupUserValueSerializer);
}
private Iterator> getDeSerializedIterator(
K key,
N namespace,
ByteArrayOutputStreamWithPos outputStream,
DataOutputView outputView,
TypeSerializer keySerializer,
TypeSerializer namespaceSerializer,
TypeSerializer dupUserKeySerializer,
TypeSerializer dupUserValueSerializer) throws Exception {
outputStream.reset();
byte[] prefix = StateSerializerUtil.getSerializedPrefixKeyForSubKeyedState(
outputStream,
outputView,
key,
keySerializer,
namespace,
namespaceSerializer,
getKeyGroup(key),
stateNameForSerialize);
StorageIterator iterator = stateStorage.prefixIterator(prefix);
return new Iterator>() {
Pair pair;
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public void remove() {
iterator.remove();
}
@Override
public Map.Entry next() {
pair = iterator.next();
return new Map.Entry() {
@Override
public MK getKey() {
try {
return StateSerializerUtil.getDeserializedMapKeyForSubKeyedMapState(
pair.getKey(),
keySerializer,
namespaceSerializer,
dupUserKeySerializer,
serializedStateNameLength);
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public MV getValue() {
try {
return StateSerializerUtil.getDeserializeSingleValue(pair.getValue(), dupUserValueSerializer);
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public MV setValue(MV value) {
Preconditions.checkNotNull(value);
try {
ByteArrayOutputStreamWithPos valueOutputStream = new ByteArrayOutputStreamWithPos();
DataOutputView valueOutputView = new DataOutputViewStreamWrapper(valueOutputStream);
dupUserValueSerializer.serialize(value, valueOutputView);
return StateSerializerUtil.getDeserializeSingleValue(pair.setValue(valueOutputStream.toByteArray()), dupUserValueSerializer);
} catch (Exception e) {
throw new StateAccessException(e);
}
}
};
}
};
}
@Override
public StateStorage getStateStorage() {
return stateStorage;
}
protected int getKeyGroup(K key) {
return partitioner.partition(key, internalStateBackend.getNumGroups());
}
}
