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.celeborn.plugin.flink.network;
  
  import java.nio.charset.StandardCharsets;
  
  import org.apache.flink.shaded.netty4.io.netty.buffer.ByteBuf;
  
  import org.apache.celeborn.common.network.buffer.NettyManagedBuffer;
  import org.apache.celeborn.common.network.protocol.*;
  import org.apache.celeborn.plugin.flink.buffer.FlinkNettyManagedBuffer;
  import org.apache.celeborn.plugin.flink.protocol.ReadData;
  import org.apache.celeborn.plugin.flink.protocol.SubPartitionReadData;
  
  public class MessageDecoderExt {
    public static Message decode(Message.Type type, ByteBuf in, boolean decodeBody) {
      long requestId;
      // cannot use actual class decode method because common module cannot refer flink shaded netty.
      switch (type) {
        case RPC_REQUEST:
          requestId = in.readLong();
          in.readInt();
          if (decodeBody) {
            return new RpcRequest(requestId, new FlinkNettyManagedBuffer(in));
          } else {
            return new RpcRequest(requestId, NettyManagedBuffer.EmptyBuffer);
          }
  
        case RPC_RESPONSE:
          requestId = in.readLong();
          in.readInt();
          if (decodeBody) {
            return new RpcResponse(requestId, new FlinkNettyManagedBuffer(in));
          } else {
            return new RpcResponse(requestId, NettyManagedBuffer.EmptyBuffer);
          }
  
        case RPC_FAILURE:
          requestId = in.readLong();
          int length = in.readInt();
          byte[] bytes = new byte[length];
          in.readBytes(bytes);
          String errorString = new String(bytes, StandardCharsets.UTF_8);
          return new RpcFailure(requestId, errorString);
  
        case ONE_WAY_MESSAGE:
          in.readInt();
          if (decodeBody) {
            return new OneWayMessage(new FlinkNettyManagedBuffer(in));
          } else {
            return new OneWayMessage(NettyManagedBuffer.EmptyBuffer);
          }
  
        case READ_ADD_CREDIT:
          long streamId = in.readLong();
          int credit = in.readInt();
          return new ReadAddCredit(streamId, credit);
  
        case READ_DATA:
          streamId = in.readLong();
          return new ReadData(streamId);
  
        case SUBPARTITION_READ_DATA:
          streamId = in.readLong();
          int subPartitionId = in.readInt();
          return new SubPartitionReadData(streamId, subPartitionId);
  
        case BACKLOG_ANNOUNCEMENT:
          streamId = in.readLong();
          int backlog = in.readInt();
          return new BacklogAnnouncement(streamId, backlog);
  
        case TRANSPORTABLE_ERROR:
          streamId = in.readLong();
          int len = in.readInt();
          byte[] errorBytes = new byte[len];
          in.readBytes(errorBytes);
          return new TransportableError(streamId, errorBytes);
  
        case HEARTBEAT:
          return new Heartbeat();
  
        case BUFFER_STREAM_END:
          streamId = in.readLong();
          return new BufferStreamEnd(streamId);
  
        default:
          throw new IllegalArgumentException("Unexpected message type: " + type);
      }
    }
  }
  