org.apache.flink.runtime.state.heap.StateTableByKeyGroupReaders Maven / Gradle / Ivy
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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.heap;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.memory.DataInputView;
import java.io.IOException;
/**
* This class provides a static factory method to create different implementations of {@link StateTableByKeyGroupReader}
* depending on the provided serialization format version.
*
* The implementations are also located here as inner classes.
*/
class StateTableByKeyGroupReaders {
/**
* Creates a new StateTableByKeyGroupReader that inserts de-serialized mappings into the given table, using the
* de-serialization algorithm that matches the given version.
*
* @param table the {@link StateTable} into which de-serialized mappings are inserted.
* @param version version for the de-serialization algorithm.
* @param type of key.
* @param type of namespace.
* @param type of state.
* @return the appropriate reader.
*/
static StateTableByKeyGroupReader readerForVersion(StateTable table, int version) {
switch (version) {
case 1:
return new StateTableByKeyGroupReaderV1<>(table);
case 2:
case 3:
case 4:
return new StateTableByKeyGroupReaderV2V3<>(table);
default:
throw new IllegalArgumentException("Unknown version: " + version);
}
}
static abstract class AbstractStateTableByKeyGroupReader
implements StateTableByKeyGroupReader {
protected final StateTable stateTable;
AbstractStateTableByKeyGroupReader(StateTable stateTable) {
this.stateTable = stateTable;
}
@Override
public abstract void readMappingsInKeyGroup(DataInputView div, int keyGroupId) throws IOException;
protected TypeSerializer getKeySerializer() {
return stateTable.keyContext.getKeySerializer();
}
protected TypeSerializer getNamespaceSerializer() {
return stateTable.getNamespaceSerializer();
}
protected TypeSerializer getStateSerializer() {
return stateTable.getStateSerializer();
}
}
static final class StateTableByKeyGroupReaderV1
extends AbstractStateTableByKeyGroupReader {
StateTableByKeyGroupReaderV1(StateTable stateTable) {
super(stateTable);
}
@Override
public void readMappingsInKeyGroup(DataInputView inView, int keyGroupId) throws IOException {
if (inView.readByte() == 0) {
return;
}
final TypeSerializer keySerializer = getKeySerializer();
final TypeSerializer namespaceSerializer = getNamespaceSerializer();
final TypeSerializer stateSerializer = getStateSerializer();
// V1 uses kind of namespace compressing format
int numNamespaces = inView.readInt();
for (int k = 0; k < numNamespaces; k++) {
N namespace = namespaceSerializer.deserialize(inView);
int numEntries = inView.readInt();
for (int l = 0; l < numEntries; l++) {
K key = keySerializer.deserialize(inView);
S state = stateSerializer.deserialize(inView);
stateTable.put(key, keyGroupId, namespace, state);
}
}
}
}
private static final class StateTableByKeyGroupReaderV2V3
extends AbstractStateTableByKeyGroupReader {
StateTableByKeyGroupReaderV2V3(StateTable stateTable) {
super(stateTable);
}
@Override
public void readMappingsInKeyGroup(DataInputView inView, int keyGroupId) throws IOException {
final TypeSerializer keySerializer = getKeySerializer();
final TypeSerializer namespaceSerializer = getNamespaceSerializer();
final TypeSerializer stateSerializer = getStateSerializer();
int numKeys = inView.readInt();
for (int i = 0; i < numKeys; ++i) {
N namespace = namespaceSerializer.deserialize(inView);
K key = keySerializer.deserialize(inView);
S state = stateSerializer.deserialize(inView);
stateTable.put(key, keyGroupId, namespace, state);
}
}
}
}