View Javadoc
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.objectecho;
17  
18  import io.netty.channel.ChannelHandlerAdapter;
19  import io.netty.channel.ChannelHandlerContext;
20  
21  import java.util.ArrayList;
22  import java.util.List;
23  
24  /**
25   * Handler implementation for the object echo client.  It initiates the
26   * ping-pong traffic between the object echo client and server by sending the
27   * first message to the server.
28   */
29  public class ObjectEchoClientHandler extends ChannelHandlerAdapter {
30  
31      private final List<Integer> firstMessage;
32  
33      /**
34       * Creates a client-side handler.
35       */
36      public ObjectEchoClientHandler() {
37          firstMessage = new ArrayList<Integer>(ObjectEchoClient.SIZE);
38          for (int i = 0; i < ObjectEchoClient.SIZE; i ++) {
39              firstMessage.add(Integer.valueOf(i));
40          }
41      }
42  
43      @Override
44      public void channelActive(ChannelHandlerContext ctx) {
45          // Send the first message if this handler is a client-side handler.
46          ctx.writeAndFlush(firstMessage);
47      }
48  
49      @Override
50      public void channelRead(ChannelHandlerContext ctx, Object msg) {
51          // Echo back the received object to the server.
52          ctx.write(msg);
53      }
54  
55      @Override
56      public void channelReadComplete(ChannelHandlerContext ctx) {
57          ctx.flush();
58      }
59  
60      @Override
61      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
62          cause.printStackTrace();
63          ctx.close();
64      }
65  }