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.netty5.example.echo;
17
18 import io.netty5.buffer.api.Buffer;
19 import io.netty5.channel.ChannelHandler;
20 import io.netty5.channel.ChannelHandlerContext;
21
22 /**
23 * Handler implementation for the echo client. It initiates the ping-pong
24 * traffic between the echo client and server by sending the first message to
25 * the server.
26 */
27 public class EchoClientHandler implements ChannelHandler {
28
29 /**
30 * Creates a client-side handler.
31 */
32 public EchoClientHandler() {
33 }
34
35 @Override
36 public void channelActive(ChannelHandlerContext ctx) {
37 Buffer firstMessage = ctx.bufferAllocator().allocate(EchoClient.SIZE);
38 for (int i = 0; i < firstMessage.capacity(); i ++) {
39 firstMessage.writeByte((byte) i);
40 }
41 ctx.writeAndFlush(firstMessage);
42 }
43
44 @Override
45 public void channelRead(ChannelHandlerContext ctx, Object msg) {
46 ctx.write(msg);
47 }
48
49 @Override
50 public void channelReadComplete(ChannelHandlerContext ctx) {
51 ctx.flush();
52 }
53
54 @Override
55 public void channelExceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
56 // Close the connection when an exception is raised.
57 cause.printStackTrace();
58 ctx.close();
59 }
60 }