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.api.java.tuple.Tuple3;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.runtime.state.KeyGroupPartitioner;
import org.apache.flink.runtime.state.StateSnapshotKeyGroupReader;
import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import java.io.IOException;
/**
* This class provides a static factory method to create different implementations of {@link StateSnapshotKeyGroupReader}
* 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 type of key.
* @param type of namespace.
* @param type of state.
* @param stateTable the {@link StateTable} into which de-serialized mappings are inserted.
* @param version version for the de-serialization algorithm.
* @return the appropriate reader.
*/
static StateSnapshotKeyGroupReader readerForVersion(
StateTable stateTable,
int version) {
switch (version) {
case 1:
return new StateTableByKeyGroupReaderV1<>(stateTable);
case 2:
case 3:
case 4:
case 5:
case 6:
return createV2PlusReader(stateTable);
default:
throw new IllegalArgumentException("Unknown version: " + version);
}
}
private static StateSnapshotKeyGroupReader createV2PlusReader(
StateTable stateTable) {
final TypeSerializer namespaceSerializer = stateTable.getNamespaceSerializer();
final TypeSerializer stateSerializer = stateTable.getStateSerializer();
final TypeSerializer keySerializer = stateTable.keySerializer;
final Tuple3 buffer = new Tuple3<>();
return KeyGroupPartitioner.createKeyGroupPartitionReader((in) -> {
buffer.f0 = namespaceSerializer.deserialize(in);
buffer.f1 = keySerializer.deserialize(in);
buffer.f2 = stateSerializer.deserialize(in);
return buffer;
}, (element, keyGroupId1) -> stateTable.put(element.f1, keyGroupId1, element.f0, element.f2));
}
static final class StateTableByKeyGroupReaderV1 implements StateSnapshotKeyGroupReader {
protected final StateTable stateTable;
protected final TypeSerializer keySerializer;
StateTableByKeyGroupReaderV1(StateTable stateTable) {
this.stateTable = stateTable;
this.keySerializer = stateTable.keySerializer;
}
@Override
public void readMappingsInKeyGroup(@Nonnull DataInputView inView, @Nonnegative int keyGroupId) throws IOException {
if (inView.readByte() == 0) {
return;
}
final TypeSerializer namespaceSerializer = stateTable.getNamespaceSerializer();
final TypeSerializer stateSerializer = stateTable.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);
}
}
}
}
}