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.ChannelHandlerContext;
19 import io.netty.channel.ChannelInboundHandlerAdapter;
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 ChannelInboundHandlerAdapter {
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 }