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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.gemini.subkeyed;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.state.StateAccessException;
import org.apache.flink.runtime.state.StateStorage;
import org.apache.flink.runtime.state.StateTransformationFunction;
import org.apache.flink.runtime.state.gemini.engine.GRegion;
import org.apache.flink.runtime.state.gemini.engine.hashtable.GRegionKMapImpl;
import org.apache.flink.runtime.state.gemini.engine.hashtable.GTableSubKeyedValueImpl;
import org.apache.flink.runtime.state.subkeyed.SubKeyedValueState;
import org.apache.flink.runtime.state.subkeyed.SubKeyedValueStateDescriptor;
import java.util.Collections;
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.util.Preconditions.checkNotNull;
/**
* An implementation of {@link SubKeyedValueState} based on an {@link StateStorage}
* The pairs in the state storage are formatted as {(K, N) -> V}, and are
* partitioned by K.
*
* @param Type of the keys in the state.
* @param Type of the namespaces in the state.
* @param Type of the values in the state.
*/
public final class GeminiSubKeyedValueStateImpl implements SubKeyedValueState {
/**
* The descriptor of this state.
*/
private final SubKeyedValueStateDescriptor descriptor;
private final GTableSubKeyedValueImpl table;
/**
* Constructor with the state storage to store the values.
*
* @param descriptor The descriptor of this state.
* @param table
*/
public GeminiSubKeyedValueStateImpl(
SubKeyedValueStateDescriptor descriptor,
GTableSubKeyedValueImpl table
) {
this.descriptor = checkNotNull(descriptor);
this.table = checkNotNull(table);
}
@Override
public SubKeyedValueStateDescriptor getDescriptor() {
return descriptor;
}
//--------------------------------------------------------------------------
@Override
public boolean contains(K key, N namespace) {
if (key == null || namespace == null) {
return false;
}
return getRegion(key).contains(key, namespace);
}
@Override
public V get(K key, N namespace) {
return getOrDefault(key, namespace, null);
}
@SuppressWarnings("unchecked")
@Override
public V getOrDefault(K key, N namespace, V defaultValue) {
if (key == null || namespace == null) {
return defaultValue;
}
return getRegion(key).getOrDefault(key, namespace, defaultValue);
}
@SuppressWarnings("unchecked")
@Override
public Map getAll(K key) {
if (key == null) {
return Collections.emptyMap();
}
Map result = getRegion(key).get(key);
return result == null ? Collections.emptyMap() : result;
}
@Override
public void remove(K key, N namespace) {
if (key == null || namespace == null) {
return;
}
getRegion(key).remove(key, namespace);
}
@Override
public void removeAll(K key) {
if (key == null) {
return;
}
getRegion(key).remove(key);
}
@Override
public void put(K key, N namespace, V value) {
checkNotNull(key);
checkNotNull(namespace);
getRegion(key).add(key, namespace, value);
}
@Override
public V getAndRemove(K key, N namespace) {
if (key == null || namespace == null) {
return null;
}
V value = get(key, namespace);
remove(key, namespace);
return value;
}
@Override
public Iterator iterator(K key) {
checkNotNull(key);
Map ret = getRegion(key).get(key);
if (ret == null) {
return Collections.emptyIterator();
} else {
Iterator namespaceIter = ret.keySet().iterator();
return new Iterator() {
N currentNamespace = null;
@Override
public boolean hasNext() {
return namespaceIter.hasNext();
}
@Override
public N next() {
currentNamespace = namespaceIter.next();
return currentNamespace;
}
@Override
public void remove() {
GeminiSubKeyedValueStateImpl.this.remove(key, currentNamespace);
}
};
}
}
@Override
public StateStorage getStateStorage() {
throw new UnsupportedOperationException();
}
@Override
public void transform(K key, N namespace, T value, StateTransformationFunction transformation) {
V oldValue = get(key, namespace);
try {
V newValue = transformation.apply(oldValue, value);
put(key, namespace, newValue);
} catch (Exception e) {
throw new StateAccessException(e);
}
}
@Override
public Iterable keys(N namespace) {
Iterator iterator = table.regionIterator();
Set result = new HashSet<>();
while (iterator.hasNext()) {
GRegionKMapImpl cur = (GRegionKMapImpl) iterator.next();
result.addAll(
cur.getAll().entrySet().stream()
.filter(a -> a.getValue().keySet().contains(namespace))
.map(a -> a.getKey())
.collect(Collectors.toSet()));
}
return result.size() == 0 ? null : result;
}
@Override
public byte[] getSerializedValue(
byte[] serializedKeyAndNamespace,
TypeSerializer safeKeySerializer,
TypeSerializer safeNamespaceSerializer,
TypeSerializer safeValueSerializer) throws Exception {
// TODO
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
private GRegionKMapImpl getRegion(K key) {
return table.getRegion(key);
}
}
