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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.example.udt.echo.message;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.channel.udt.UdtMessage;
  import io.netty.channel.udt.nio.NioUdtProvider;
  
  /**
   * Handler implementation for the echo client. It initiates the ping-pong
   * traffic between the echo client and server by sending the first message to
   * the server on activation.
   */
  public class MsgEchoClientHandler extends SimpleChannelInboundHandler<UdtMessage> {
  
      private final UdtMessage message;
  
      public MsgEchoClientHandler() {
          super(false);
          final ByteBuf byteBuf = Unpooled.buffer(MsgEchoClient.SIZE);
          for (int i = 0; i < byteBuf.capacity(); i++) {
              byteBuf.writeByte((byte) i);
          }
          message = new UdtMessage(byteBuf);
      }
  
      @Override
      public void channelActive(final ChannelHandlerContext ctx) {
          System.err.println("ECHO active " + NioUdtProvider.socketUDT(ctx.channel()).toStringOptions());
          ctx.writeAndFlush(message);
      }
  
      @Override
      public void channelRead0(ChannelHandlerContext ctx, UdtMessage msg) {
          ctx.write(msg);
      }
  
      @Override
      public void channelReadComplete(ChannelHandlerContext ctx) {
          ctx.flush();
      }
  
      @Override
      public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
          cause.printStackTrace();
          ctx.close();
      }
  }