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.hbase.thirdparty.io.netty.buffer.ByteBuf;
021import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
022import org.apache.hbase.thirdparty.io.netty.channel.ChannelInboundHandlerAdapter;
023import org.apache.hbase.thirdparty.io.netty.channel.group.ChannelGroup;
024
025import org.apache.yetus.audience.InterfaceAudience;
026
027/**
028 * Decoder for rpc request.
029 * @since 2.0.0
030 */
031@InterfaceAudience.Private
032class NettyRpcServerRequestDecoder extends ChannelInboundHandlerAdapter {
033
034  private final ChannelGroup allChannels;
035
036  private final MetricsHBaseServer metrics;
037
038  public NettyRpcServerRequestDecoder(ChannelGroup allChannels, MetricsHBaseServer metrics) {
039    this.allChannels = allChannels;
040    this.metrics = metrics;
041  }
042
043  private NettyServerRpcConnection connection;
044
045  void setConnection(NettyServerRpcConnection connection) {
046    this.connection = connection;
047  }
048
049  @Override
050  public void channelActive(ChannelHandlerContext ctx) throws Exception {
051    allChannels.add(ctx.channel());
052    NettyRpcServer.LOG.trace("Connection {}; # active connections={}",
053        ctx.channel().remoteAddress(), (allChannels.size() - 1));
054    super.channelActive(ctx);
055  }
056
057  @Override
058  public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
059    ByteBuf input = (ByteBuf) msg;
060    // 4 bytes length field
061    metrics.receivedBytes(input.readableBytes() + 4);
062    connection.process(input);
063  }
064
065  @Override
066  public void channelInactive(ChannelHandlerContext ctx) throws Exception {
067    allChannels.remove(ctx.channel());
068    NettyRpcServer.LOG.trace("Disconnection {}; # active connections={}",
069        ctx.channel().remoteAddress(), (allChannels.size() - 1));
070    super.channelInactive(ctx);
071  }
072
073  @Override
074  public void exceptionCaught(ChannelHandlerContext ctx, Throwable e) {
075    allChannels.remove(ctx.channel());
076    NettyRpcServer.LOG.trace("Connection {}; caught unexpected downstream exception.",
077        ctx.channel().remoteAddress(), e.getCause());
078    ctx.channel().close();
079  }
080}