/* * 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 com.king.bravo.utils; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.apache.flink.api.common.typeutils.TypeSerializer; import org.apache.flink.core.memory.ByteArrayInputStreamWithPos; import org.apache.flink.core.memory.ByteArrayOutputStreamWithPos; import org.apache.flink.core.memory.DataInputView; import org.apache.flink.core.memory.DataInputViewStreamWrapper; import org.apache.flink.core.memory.DataOutputView; /** * Utils for RocksDB state serialization and deserialization. */ public class RocksDBUtils { 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> K readKey( TypeSerializer<K> keySerializer, ByteArrayInputStreamWithPos inputStream, DataInputView inputView, boolean ambiguousKeyPossible) throws IOException { int beforeRead = inputStream.getPosition(); K key = keySerializer.deserialize(inputView); if (ambiguousKeyPossible) { int length = inputStream.getPosition() - beforeRead; readVariableIntBytes(inputView, length); } return key; } public static <N> N readNamespace( TypeSerializer<N> namespaceSerializer, ByteArrayInputStreamWithPos inputStream, DataInputView inputView, boolean ambiguousKeyPossible) throws IOException { int beforeRead = inputStream.getPosition(); N namespace = namespaceSerializer.deserialize(inputView); if (ambiguousKeyPossible) { int length = inputStream.getPosition() - beforeRead; readVariableIntBytes(inputView, length); } return namespace; } public static <N> void writeNameSpace( N namespace, TypeSerializer<N> namespaceSerializer, ByteArrayOutputStreamWithPos keySerializationStream, DataOutputView keySerializationDataOutputView, boolean ambiguousKeyPossible) throws IOException { int beforeWrite = keySerializationStream.getPosition(); namespaceSerializer.serialize(namespace, keySerializationDataOutputView); if (ambiguousKeyPossible) { // write length of namespace writeLengthFrom(beforeWrite, keySerializationStream, keySerializationDataOutputView); } } public static boolean isAmbiguousKeyPossible(TypeSerializer<?> keySerializer, TypeSerializer<?> namespaceSerializer) { return (keySerializer.getLength() < 0) && (namespaceSerializer.getLength() < 0); } 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 <K> void writeKey( K key, TypeSerializer<K> keySerializer, ByteArrayOutputStreamWithPos keySerializationStream, DataOutputView keySerializationDataOutputView, boolean ambiguousKeyPossible) throws IOException { // write key int beforeWrite = keySerializationStream.getPosition(); keySerializer.serialize(key, keySerializationDataOutputView); if (ambiguousKeyPossible) { // write size of key writeLengthFrom(beforeWrite, keySerializationStream, keySerializationDataOutputView); } } private static void readVariableIntBytes(DataInputView inputView, int value) throws IOException { do { inputView.readByte(); value >>>= 8; } while (value != 0); } private static void writeLengthFrom( int fromPosition, ByteArrayOutputStreamWithPos keySerializationStream, DataOutputView keySerializationDateDataOutputView) throws IOException { int length = keySerializationStream.getPosition() - fromPosition; writeVariableIntBytes(length, keySerializationDateDataOutputView); } private 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; } public static <V> List<V> deserializeList( byte[] valueBytes, TypeSerializer<V> elementSerializer, boolean ttl) throws IOException { if (valueBytes == null) { return null; } ByteArrayInputStreamWithPos is = new ByteArrayInputStreamWithPos(valueBytes); DataInputViewStreamWrapper in = new DataInputViewStreamWrapper(is); List<V> result = new ArrayList<>(); V next; while ((next = deserializeNextElement(in, elementSerializer, ttl)) != null) { result.add(next); } return result; } public static <V> V deserializeNextElement( DataInputViewStreamWrapper in, TypeSerializer<V> elementSerializer, boolean ttl) throws IOException { if (in.available() > 0) { if (ttl) { in.skipBytesToRead(Long.BYTES); } V element = elementSerializer.deserialize(in); if (in.available() > 0) { in.readByte(); } System.err.println(element); return element; } return null; } }