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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  }