content: /*
   * 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.kv;
  
  import com.google.protobuf.InvalidProtocolBufferException;
  import com.google.protobuf.UnsafeByteOperations;
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufOutputStream;
  import io.netty.buffer.PooledByteBufAllocator;
  import io.netty.util.ReferenceCountUtil;
  import java.io.IOException;
  import lombok.AccessLevel;
  import lombok.NoArgsConstructor;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.common.coder.Coder;
  import org.apache.bookkeeper.proto.statestore.kv.Command;
  import org.apache.bookkeeper.proto.statestore.kv.DeleteRequest;
  import org.apache.bookkeeper.proto.statestore.kv.NopRequest;
  import org.apache.bookkeeper.proto.statestore.kv.PutIfAbsentRequest;
  import org.apache.bookkeeper.proto.statestore.kv.PutRequest;
  
  /**
   * Utils for kv stores.
   */
  @Slf4j
  @NoArgsConstructor(access = AccessLevel.PRIVATE)
  final class KVUtils {
  
      static final Command NOP_CMD = Command.newBuilder()
          .setNopReq(NopRequest.newBuilder().build())
          .build();
  
      static ByteBuf serialize(ByteBuf valBuf, long revision) {
          int serializedSize = valBuf.readableBytes() + Long.BYTES;
          ByteBuf buffer = PooledByteBufAllocator.DEFAULT.heapBuffer(serializedSize);
          buffer.writeLong(revision);
          buffer.writeBytes(valBuf);
          return buffer;
      }
  
      static ByteBuf serialize(byte[] value, long revision) {
          int serializedSize = value.length + Long.BYTES;
          ByteBuf buffer = PooledByteBufAllocator.DEFAULT.heapBuffer(serializedSize);
          buffer.writeLong(revision);
          buffer.writeBytes(value);
          return buffer;
      }
  
      static <V> V deserialize(Coder<V> valCoder,
                               ByteBuf valBuf) {
          valBuf.skipBytes(Long.BYTES);
          return valCoder.decode(valBuf);
      }
  
      static Command newCommand(ByteBuf cmdBuf) throws InvalidProtocolBufferException {
          return Command.parseFrom(cmdBuf.nioBuffer());
      }
  
      static ByteBuf newCommandBuf(Command cmd) throws IOException {
          ByteBuf buf = PooledByteBufAllocator.DEFAULT.buffer(cmd.getSerializedSize());
          try {
              cmd.writeTo(new ByteBufOutputStream(buf));
          } catch (IOException e) {
              ReferenceCountUtil.release(buf);
              throw e;
          }
          return buf;
      }
  
      static PutRequest newPutRequest(byte[] keyBytes,
                                      byte[] valBytes) {
          return PutRequest.newBuilder()
              .setKey(UnsafeByteOperations.unsafeWrap(keyBytes))
              .setValue(UnsafeByteOperations.unsafeWrap(valBytes))
              .build();
      }
  
      static PutIfAbsentRequest newPutIfAbsentRequest(byte[] keyBytes,
                                                      byte[] valBytes) {
          return PutIfAbsentRequest.newBuilder()
              .setKey(UnsafeByteOperations.unsafeWrap(keyBytes))
              .setValue(UnsafeByteOperations.unsafeWrap(valBytes))
              .build();
      }
  
      static DeleteRequest newDeleteRequest(byte[] keyBytes) {
          return DeleteRequest.newBuilder()
              .setKey(UnsafeByteOperations.unsafeWrap(keyBytes))
              .build();
      }
  
  }
  