| /* |
| * 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.bookkeeper.statelib.impl.mvcc; |
| |
| import com.google.protobuf.CodedOutputStream; |
| import com.google.protobuf.InvalidProtocolBufferException; |
| import io.netty.buffer.ByteBuf; |
| import io.netty.buffer.Unpooled; |
| import io.netty.util.ReferenceCountUtil; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import lombok.AccessLevel; |
| import lombok.NoArgsConstructor; |
| import org.apache.bookkeeper.common.coder.Coder; |
| import org.apache.bookkeeper.statelib.api.exceptions.StateStoreRuntimeException; |
| import org.apache.bookkeeper.stream.proto.kv.store.KeyMeta; |
| |
| /** |
| * A coder for encoding and decoding {@link MVCCRecord}s. |
| */ |
| @NoArgsConstructor(access = AccessLevel.PRIVATE) |
| final class MVCCRecordCoder implements Coder<MVCCRecord> { |
| |
| public static MVCCRecordCoder of() { |
| return INSTANCE; |
| } |
| |
| private static final MVCCRecordCoder INSTANCE = new MVCCRecordCoder(); |
| |
| |
| @Override |
| public byte[] encode(MVCCRecord record) { |
| KeyMeta meta = KeyMeta.newBuilder() |
| .setCreateRevision(record.getCreateRev()) |
| .setModRevision(record.getModRev()) |
| .setVersion(record.getVersion()) |
| .setValueType(record.getValueType()) |
| .setExpireTime(record.getExpireTime()) |
| .build(); |
| int metaLen = meta.getSerializedSize(); |
| int valLen = record.getValue().readableBytes(); |
| |
| int totalLen = |
| Integer.BYTES // meta len |
| + metaLen // meta bytes |
| + Integer.BYTES // val len |
| + valLen; // val bytes |
| |
| // NOTE: currently rocksdb jni only supports `byte[]` |
| // we can improve this if rocksdb jni support ByteBuffer or ByteBuf |
| byte[] data = new byte[totalLen]; |
| ByteBuf buf = Unpooled.wrappedBuffer(data); |
| buf.writerIndex(0); |
| buf.writeInt(metaLen); |
| CodedOutputStream out = CodedOutputStream.newInstance(data, Integer.BYTES, metaLen); |
| try { |
| meta.writeTo(out); |
| } catch (IOException e) { |
| throw new StateStoreRuntimeException("Failed to serialize key metadata", e); |
| } |
| buf.writerIndex(buf.writerIndex() + metaLen); |
| buf.writeInt(valLen); |
| buf.writeBytes(record.getValue().slice()); |
| ReferenceCountUtil.release(buf); |
| |
| return data; |
| } |
| |
| @Override |
| public void encode(MVCCRecord value, ByteBuf destBuf) { |
| destBuf.writeBytes(encode(value)); |
| } |
| |
| @Override |
| public int getSerializedSize(MVCCRecord record) { |
| KeyMeta meta = KeyMeta.newBuilder() |
| .setCreateRevision(record.getCreateRev()) |
| .setModRevision(record.getModRev()) |
| .setVersion(record.getVersion()) |
| .setValueType(record.getValueType()) |
| .setExpireTime(record.getExpireTime()) |
| .build(); |
| int metaLen = meta.getSerializedSize(); |
| int valLen = record.getValue().readableBytes(); |
| |
| return Integer.BYTES // meta len |
| + metaLen // meta bytes |
| + Integer.BYTES // val len |
| + valLen; // val bytes |
| } |
| |
| @Override |
| public MVCCRecord decode(ByteBuf data) { |
| ByteBuf copy = data.slice(); |
| |
| int metaLen = copy.readInt(); |
| ByteBuffer metaBuf = copy.slice(copy.readerIndex(), metaLen).nioBuffer(); |
| KeyMeta meta; |
| try { |
| meta = KeyMeta.parseFrom(metaBuf); |
| } catch (InvalidProtocolBufferException e) { |
| throw new StateStoreRuntimeException("Failed to deserialize key metadata", e); |
| } |
| copy.skipBytes(metaLen); |
| int valLen = copy.readInt(); |
| ByteBuf valBuf = copy.retainedSlice(copy.readerIndex(), valLen); |
| |
| MVCCRecord record = MVCCRecord.newRecord(); |
| record.setCreateRev(meta.getCreateRevision()); |
| record.setModRev(meta.getModRevision()); |
| record.setVersion(meta.getVersion()); |
| record.setExpireTime(meta.getExpireTime()); |
| record.setValue(valBuf, meta.getValueType()); |
| return record; |
| } |
| |
| |
| } |