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.sctp;
17
18 import io.netty.buffer.ByteBuf;
19 import io.netty.buffer.Unpooled;
20 import io.netty.channel.ChannelHandlerContext;
21 import io.netty.channel.ChannelInboundHandlerAdapter;
22 import io.netty.channel.sctp.SctpMessage;
23
24 /**
25 * Handler implementation for the SCTP echo client. It initiates the ping-pong
26 * traffic between the echo client and server by sending the first message to
27 * the server.
28 */
29 public class SctpEchoClientHandler extends ChannelInboundHandlerAdapter {
30
31 private final ByteBuf firstMessage;
32
33 /**
34 * Creates a client-side handler.
35 */
36 public SctpEchoClientHandler() {
37 firstMessage = Unpooled.buffer(SctpEchoClient.SIZE);
38 for (int i = 0; i < firstMessage.capacity(); i++) {
39 firstMessage.writeByte((byte) i);
40 }
41 }
42
43 @Override
44 public void channelActive(ChannelHandlerContext ctx) {
45 ctx.writeAndFlush(new SctpMessage(0, 0, firstMessage));
46 }
47
48 @Override
49 public void channelRead(ChannelHandlerContext ctx, Object 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(ChannelHandlerContext ctx, Throwable cause) {
60 // Close the connection when an exception is raised.
61 cause.printStackTrace();
62 ctx.close();
63 }
64 }