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.echo;
17
18 import java.net.InetSocketAddress;
19 import java.util.concurrent.Executors;
20
21 import org.jboss.netty.bootstrap.ClientBootstrap;
22 import org.jboss.netty.channel.ChannelFuture;
23 import org.jboss.netty.channel.ChannelPipeline;
24 import org.jboss.netty.channel.ChannelPipelineFactory;
25 import org.jboss.netty.channel.Channels;
26 import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
27
28 /**
29 * Sends one message when a connection is open and echoes back any received
30 * data to the server. Simply put, the echo client initiates the ping-pong
31 * traffic between the echo client and server by sending the first message to
32 * the server.
33 *
34 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
35 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
36 *
37 * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
38 *
39 */
40 public class EchoClient {
41
42 public static void main(String[] args) throws Exception {
43 // Print usage if no argument is specified.
44 if (args.length < 2 || args.length > 3) {
45 System.err.println(
46 "Usage: " + EchoClient.class.getSimpleName() +
47 " <host> <port> [<first message size>]");
48 return;
49 }
50
51 // Parse options.
52 final String host = args[0];
53 final int port = Integer.parseInt(args[1]);
54 final int firstMessageSize;
55 if (args.length == 3) {
56 firstMessageSize = Integer.parseInt(args[2]);
57 } else {
58 firstMessageSize = 256;
59 }
60
61 // Configure the client.
62 ClientBootstrap bootstrap = new ClientBootstrap(
63 new NioClientSocketChannelFactory(
64 Executors.newCachedThreadPool(),
65 Executors.newCachedThreadPool()));
66
67 // Set up the pipeline factory.
68 bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
69 public ChannelPipeline getPipeline() throws Exception {
70 return Channels.pipeline(
71 new EchoClientHandler(firstMessageSize));
72 }
73 });
74
75 // Start the connection attempt.
76 ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));
77
78 // Wait until the connection is closed or the connection attempt fails.
79 future.getChannel().getCloseFuture().awaitUninterruptibly();
80
81 // Shut down thread pools to exit.
82 bootstrap.releaseExternalResources();
83 }
84 }