001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.ipc;
019
020import org.apache.hadoop.hbase.util.NettyFutureUtils;
021import org.apache.yetus.audience.InterfaceAudience;
022
023import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
024import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
025import org.apache.hbase.thirdparty.io.netty.channel.SimpleChannelInboundHandler;
026
027/**
028 * Decoder for rpc request.
029 * @since 2.0.0
030 */
031@InterfaceAudience.Private
032class NettyRpcServerRequestDecoder extends SimpleChannelInboundHandler<ByteBuf> {
033
034  private final MetricsHBaseServer metrics;
035
036  private final NettyServerRpcConnection connection;
037
038  public NettyRpcServerRequestDecoder(MetricsHBaseServer metrics,
039    NettyServerRpcConnection connection) {
040    super(false);
041    this.metrics = metrics;
042    this.connection = connection;
043  }
044
045  @Override
046  public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) {
047    NettyRpcServer.LOG.warn("Connection {}; caught unexpected downstream exception.",
048      ctx.channel().remoteAddress(), e);
049    NettyFutureUtils.safeClose(ctx);
050  }
051
052  @Override
053  protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
054    // 4 bytes length field
055    metrics.receivedBytes(msg.readableBytes() + 4);
056    connection.process(msg);
057  }
058}