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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.example.udt.echo.message;
17  
18  import io.netty.buffer.ByteBuf;
19  import io.netty.buffer.Unpooled;
20  import io.netty.channel.ChannelHandlerContext;
21  import io.netty.channel.SimpleChannelInboundHandler;
22  import io.netty.channel.udt.UdtMessage;
23  import io.netty.channel.udt.nio.NioUdtProvider;
24  
25  /**
26   * Handler implementation for the echo client. It initiates the ping-pong
27   * traffic between the echo client and server by sending the first message to
28   * the server on activation.
29   */
30  public class MsgEchoClientHandler extends SimpleChannelInboundHandler<UdtMessage> {
31  
32      private final UdtMessage message;
33  
34      public MsgEchoClientHandler() {
35          super(false);
36          final ByteBuf byteBuf = Unpooled.buffer(MsgEchoClient.SIZE);
37          for (int i = 0; i < byteBuf.capacity(); i++) {
38              byteBuf.writeByte((byte) i);
39          }
40          message = new UdtMessage(byteBuf);
41      }
42  
43      @Override
44      public void channelActive(final ChannelHandlerContext ctx) {
45          System.err.println("ECHO active " + NioUdtProvider.socketUDT(ctx.channel()).toStringOptions());
46          ctx.writeAndFlush(message);
47      }
48  
49      @Override
50      public void messageReceived(ChannelHandlerContext ctx, UdtMessage msg) {
51          ctx.write(msg);
52      }
53  
54      @Override
55      public void channelReadComplete(ChannelHandlerContext ctx) {
56          ctx.flush();
57      }
58  
59      @Override
60      public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
61          cause.printStackTrace();
62          ctx.close();
63      }
64  }