exec/rpc/src/main/java/org/apache/drill/exec/rpc/OutboundRpcMessage.java

/*
 * 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.drill.exec.rpc;

import io.netty.buffer.ByteBuf;

import java.util.Arrays;
import java.util.List;

import org.apache.drill.exec.proto.GeneralRPCProtos.RpcMode;

import com.google.common.collect.Lists;
import com.google.protobuf.Internal.EnumLite;
import com.google.protobuf.MessageLite;

public class OutboundRpcMessage extends RpcMessage {
  static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(OutboundRpcMessage.class);

  final MessageLite pBody;
  public ByteBuf[] dBodies;



  public OutboundRpcMessage(RpcMode mode, EnumLite rpcType, int coordinationId, MessageLite pBody, ByteBuf... dBodies) {
      this(mode, rpcType.getNumber(), coordinationId, pBody, dBodies);
  }


  OutboundRpcMessage(RpcMode mode, int rpcTypeNumber, int coordinationId, MessageLite pBody, ByteBuf... dBodies) {
    super(mode, rpcTypeNumber, coordinationId);
    this.pBody = pBody;

    // Netty doesn't traditionally release the reference on an unreadable buffer.  However, we need to so that if we send a empty or unwritable buffer, we still release.  otherwise we get weird memory leaks when sending empty vectors.
    List<ByteBuf> bufs = Lists.newArrayList();
    for (ByteBuf d : dBodies) {
      if (d.readableBytes() == 0) {
        d.release();
      } else {
        bufs.add(d);
      }
    }
    this.dBodies = bufs.toArray(new ByteBuf[bufs.size()]);
  }

  @Override
  public int getBodySize() {
    int len = pBody.getSerializedSize();
    len += RpcEncoder.getRawVarintSize(len);
    len += getRawBodySize();
    return len;
  }

  public int getRawBodySize() {
    if (dBodies == null) {
      return 0;
    }
    int len = 0;

    for (int i = 0; i < dBodies.length; i++) {
      if (RpcConstants.EXTRA_DEBUGGING) {
        logger.debug("Reader Index {}, Writer Index {}", dBodies[i].readerIndex(), dBodies[i].writerIndex());
      }
      len += dBodies[i].readableBytes();
    }
    return len;
  }

  @Override
  public String toString() {
    return "OutboundRpcMessage [pBody=" + pBody + ", mode=" + mode + ", rpcType=" + rpcType + ", coordinationId="
        + coordinationId + ", dBodies=" + Arrays.toString(dBodies) + "]";
  }

  @Override
  void release() {
    if (dBodies != null) {
      for (ByteBuf b : dBodies) {
        b.release();
      }
    }
  }

}