1 /*
2 * Copyright 2009 Red Hat, Inc.
3 *
4 * Red Hat licenses this file to you under the Apache License, version 2.0
5 * (the "License"); you may not use this file except in compliance with the
6 * 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 org.jboss.netty.example.qotm;
17
18 import java.net.InetSocketAddress;
19 import java.util.concurrent.Executors;
20
21 import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
22 import org.jboss.netty.channel.ChannelPipeline;
23 import org.jboss.netty.channel.ChannelPipelineFactory;
24 import org.jboss.netty.channel.Channels;
25 import org.jboss.netty.channel.FixedReceiveBufferSizePredictorFactory;
26 import org.jboss.netty.channel.socket.DatagramChannel;
27 import org.jboss.netty.channel.socket.DatagramChannelFactory;
28 import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
29 import org.jboss.netty.handler.codec.string.StringDecoder;
30 import org.jboss.netty.handler.codec.string.StringEncoder;
31 import org.jboss.netty.util.CharsetUtil;
32
33 /**
34 * A UDP broadcast client that asks for a quote of the moment (QOTM) to
35 * {@link QuoteOfTheMomentServer}.
36 *
37 * Inspired by <a href="http://java.sun.com/docs/books/tutorial/networking/datagrams/clientServer.html">the official Java tutorial</a>.
38 *
39 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
40 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
41 * @version $Rev: 2104 $, $Date: 2010-01-28 16:50:28 +0900 (Thu, 28 Jan 2010) $
42 */
43 public class QuoteOfTheMomentClient {
44
45 public static void main(String[] args) throws Exception {
46 DatagramChannelFactory f =
47 new NioDatagramChannelFactory(Executors.newCachedThreadPool());
48
49 ConnectionlessBootstrap b = new ConnectionlessBootstrap(f);
50
51 // Configure the pipeline factory.
52 b.setPipelineFactory(new ChannelPipelineFactory() {
53 public ChannelPipeline getPipeline() throws Exception {
54 return Channels.pipeline(
55 new StringEncoder(CharsetUtil.ISO_8859_1),
56 new StringDecoder(CharsetUtil.ISO_8859_1),
57 new QuoteOfTheMomentClientHandler());
58 }
59 });
60
61 // Enable broadcast
62 b.setOption("broadcast", "true");
63
64 // Allow packets as large as up to 1024 bytes (default is 768).
65 // You could increase or decrease this value to avoid truncated packets
66 // or to improve memory footprint respectively.
67 //
68 // Please also note that a large UDP packet might be truncated or
69 // dropped by your router no matter how you configured this option.
70 // In UDP, a packet is truncated or dropped if it is larger than a
71 // certain size, depending on router configuration. IPv4 routers
72 // truncate and IPv6 routers drop a large packet. That's why it is
73 // safe to send small packets in UDP.
74 b.setOption(
75 "receiveBufferSizePredictorFactory",
76 new FixedReceiveBufferSizePredictorFactory(1024));
77
78 DatagramChannel c = (DatagramChannel) b.bind(new InetSocketAddress(0));
79
80 // Broadcast the QOTM request to port 8080.
81 c.write("QOTM?", new InetSocketAddress("255.255.255.255", 8080));
82
83 // QuoteOfTheMomentClientHandler will close the DatagramChannel when a
84 // response is received. If the channel is not closed within 5 seconds,
85 // print an error message and quit.
86 if (!c.getCloseFuture().awaitUninterruptibly(5000)) {
87 System.err.println("QOTM request timed out.");
88 c.close().awaitUninterruptibly();
89 }
90
91 f.releaseExternalResources();
92 }
93 }