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.factorial;
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.Channel;
23 import org.jboss.netty.channel.ChannelFuture;
24 import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
25
26 /**
27 * Sends a sequence of integers to a {@link FactorialServer} to calculate
28 * the factorial of the specified integer.
29 *
30 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
31 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
32 *
33 * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
34 */
35 public class FactorialClient {
36
37 public static void main(String[] args) throws Exception {
38 // Print usage if no argument is specified.
39 if (args.length != 3) {
40 System.err.println(
41 "Usage: " + FactorialClient.class.getSimpleName() +
42 " <host> <port> <count>");
43 return;
44 }
45
46 // Parse options.
47 String host = args[0];
48 int port = Integer.parseInt(args[1]);
49 int count = Integer.parseInt(args[2]);
50 if (count <= 0) {
51 throw new IllegalArgumentException("count must be a positive integer.");
52 }
53
54 // Configure the client.
55 ClientBootstrap bootstrap = new ClientBootstrap(
56 new NioClientSocketChannelFactory(
57 Executors.newCachedThreadPool(),
58 Executors.newCachedThreadPool()));
59
60 // Set up the event pipeline factory.
61 bootstrap.setPipelineFactory(new FactorialClientPipelineFactory(count));
62
63 // Make a new connection.
64 ChannelFuture connectFuture =
65 bootstrap.connect(new InetSocketAddress(host, port));
66
67 // Wait until the connection is made successfully.
68 Channel channel = connectFuture.awaitUninterruptibly().getChannel();
69
70 // Get the handler instance to retrieve the answer.
71 FactorialClientHandler handler =
72 (FactorialClientHandler) channel.getPipeline().getLast();
73
74 // Print out the answer.
75 System.err.format(
76 "Factorial of %,d is: %,d", count, handler.getFactorial());
77
78 // Shut down all thread pools to exit.
79 bootstrap.releaseExternalResources();
80 }
81 }