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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;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.memory.DataInputDeserializer;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputSerializer;
import org.apache.flink.core.memory.DataOutputView;
import javax.annotation.Nonnull;
import java.io.IOException;
/** Utils for RocksDB state serialization and deserialization. */
public class CompositeKeySerializationUtils {
public static int readKeyGroup(int keyGroupPrefixBytes, DataInputView inputView)
throws IOException {
int keyGroup = 0;
for (int i = 0; i < keyGroupPrefixBytes; ++i) {
keyGroup <<= 8;
keyGroup |= (inputView.readByte() & 0xFF);
}
return keyGroup;
}
public static K readKey(
TypeSerializer keySerializer,
DataInputDeserializer inputView,
boolean ambiguousKeyPossible)
throws IOException {
int beforeRead = inputView.getPosition();
K key = keySerializer.deserialize(inputView);
if (ambiguousKeyPossible) {
int length = inputView.getPosition() - beforeRead;
readVariableIntBytes(inputView, length);
}
return key;
}
public static N readNamespace(
TypeSerializer namespaceSerializer,
DataInputDeserializer inputView,
boolean ambiguousKeyPossible)
throws IOException {
int beforeRead = inputView.getPosition();
N namespace = namespaceSerializer.deserialize(inputView);
if (ambiguousKeyPossible) {
int length = inputView.getPosition() - beforeRead;
readVariableIntBytes(inputView, length);
}
return namespace;
}
public static void writeNameSpace(
N namespace,
TypeSerializer namespaceSerializer,
DataOutputSerializer keySerializationDataOutputView,
boolean ambiguousKeyPossible)
throws IOException {
int beforeWrite = keySerializationDataOutputView.length();
namespaceSerializer.serialize(namespace, keySerializationDataOutputView);
if (ambiguousKeyPossible) {
// write length of namespace
writeLengthFrom(beforeWrite, keySerializationDataOutputView);
}
}
public static boolean isSerializerTypeVariableSized(@Nonnull TypeSerializer serializer) {
return serializer.getLength() < 0;
}
public static boolean isAmbiguousKeyPossible(
TypeSerializer keySerializer, TypeSerializer namespaceSerializer) {
return (isSerializerTypeVariableSized(keySerializer)
&& isSerializerTypeVariableSized(namespaceSerializer));
}
public static void writeKeyGroup(
int keyGroup,
int keyGroupPrefixBytes,
DataOutputView keySerializationDateDataOutputView)
throws IOException {
for (int i = keyGroupPrefixBytes; --i >= 0; ) {
keySerializationDateDataOutputView.writeByte(extractByteAtPosition(keyGroup, i));
}
}
public static void writeKey(
K key,
TypeSerializer keySerializer,
DataOutputSerializer keySerializationDataOutputView,
boolean ambiguousKeyPossible)
throws IOException {
// write key
int beforeWrite = keySerializationDataOutputView.length();
keySerializer.serialize(key, keySerializationDataOutputView);
if (ambiguousKeyPossible) {
// write size of key
writeLengthFrom(beforeWrite, keySerializationDataOutputView);
}
}
public static void readVariableIntBytes(DataInputView inputView, int value) throws IOException {
do {
inputView.readByte();
value >>>= 8;
} while (value != 0);
}
private static void writeLengthFrom(
int fromPosition, DataOutputSerializer keySerializationDateDataOutputView)
throws IOException {
int length = keySerializationDateDataOutputView.length() - fromPosition;
writeVariableIntBytes(length, keySerializationDateDataOutputView);
}
public static void writeVariableIntBytes(
int value, DataOutputView keySerializationDateDataOutputView) throws IOException {
do {
keySerializationDateDataOutputView.writeByte(value);
value >>>= 8;
} while (value != 0);
}
public static void serializeKeyGroup(int keyGroup, byte[] startKeyGroupPrefixBytes) {
final int keyGroupPrefixBytes = startKeyGroupPrefixBytes.length;
for (int j = 0; j < keyGroupPrefixBytes; ++j) {
startKeyGroupPrefixBytes[j] =
extractByteAtPosition(keyGroup, keyGroupPrefixBytes - j - 1);
}
}
private static byte extractByteAtPosition(int value, int byteIdx) {
return (byte) ((value >>> (byteIdx << 3)));
}
public static int computeRequiredBytesInKeyGroupPrefix(int totalKeyGroupsInJob) {
return totalKeyGroupsInJob > (Byte.MAX_VALUE + 1) ? 2 : 1;
}
}
