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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.bytes;
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.nio.NioUdtProvider;
23  
24  /**
25   * Handler implementation for the echo client. It initiates the ping-pong
26   * traffic between the echo client and server by sending the first message to
27   * the server on activation.
28   */
29  public class ByteEchoClientHandler extends SimpleChannelInboundHandler<ByteBuf> {
30  
31      private final ByteBuf message;
32  
33      public ByteEchoClientHandler() {
34          super(false);
35  
36          message = Unpooled.buffer(ByteEchoClient.SIZE);
37          for (int i = 0; i < message.capacity(); i++) {
38              message.writeByte((byte) i);
39          }
40      }
41  
42      @Override
43      public void channelActive(final ChannelHandlerContext ctx) {
44          System.err.println("ECHO active " + NioUdtProvider.socketUDT(ctx.channel()).toStringOptions());
45          ctx.writeAndFlush(message);
46      }
47  
48      @Override
49      public void messageReceived(ChannelHandlerContext ctx, ByteBuf msg) {
50          ctx.write(msg);
51      }
52  
53      @Override
54      public void channelReadComplete(ChannelHandlerContext ctx) {
55          ctx.flush();
56      }
57  
58      @Override
59      public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cause) {
60          cause.printStackTrace();
61          ctx.close();
62      }
63  
64  }