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 * https://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.ChannelFuture;
19 import io.netty.channel.ChannelHandlerContext;
20 import io.netty.channel.ChannelInboundHandlerAdapter;
21
22 import java.util.ArrayList;
23 import java.util.List;
24
25 import static io.netty.channel.ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE;
26
27 /**
28 * Handler implementation for the object echo client. It initiates the
29 * ping-pong traffic between the object echo client and server by sending the
30 * first message to the server.
31 */
32 public class ObjectEchoClientHandler extends ChannelInboundHandlerAdapter {
33
34 private final List<Integer> firstMessage;
35
36 /**
37 * Creates a client-side handler.
38 */
39 public ObjectEchoClientHandler() {
40 firstMessage = new ArrayList<Integer>(ObjectEchoClient.SIZE);
41 for (int i = 0; i < ObjectEchoClient.SIZE; i ++) {
42 firstMessage.add(Integer.valueOf(i));
43 }
44 }
45
46 @Override
47 public void channelActive(ChannelHandlerContext ctx) {
48 // Send the first message if this handler is a client-side handler.
49 ChannelFuture future = ctx.writeAndFlush(firstMessage);
50 future.addListener(FIRE_EXCEPTION_ON_FAILURE); // Let object serialisation exceptions propagate.
51 }
52
53 @Override
54 public void channelRead(ChannelHandlerContext ctx, Object msg) {
55 // Echo back the received object to the server.
56 ctx.write(msg);
57 }
58
59 @Override
60 public void channelReadComplete(ChannelHandlerContext ctx) {
61 ctx.flush();
62 }
63
64 @Override
65 public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
66 cause.printStackTrace();
67 ctx.close();
68 }
69 }