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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.factorial;
17  
18  import io.netty.bootstrap.Bootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.EventLoopGroup;
21  import io.netty.channel.nio.NioEventLoopGroup;
22  import io.netty.channel.socket.nio.NioSocketChannel;
23  import io.netty.handler.ssl.SslContext;
24  import io.netty.handler.ssl.SslContextBuilder;
25  import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
26  
27  /**
28   * Sends a sequence of integers to a {@link FactorialServer} to calculate
29   * the factorial of the specified integer.
30   */
31  public final class FactorialClient {
32  
33      static final boolean SSL = System.getProperty("ssl") != null;
34      static final String HOST = System.getProperty("host", "127.0.0.1");
35      static final int PORT = Integer.parseInt(System.getProperty("port", "8322"));
36      static final int COUNT = Integer.parseInt(System.getProperty("count", "1000"));
37  
38      public static void main(String[] args) throws Exception {
39          // Configure SSL.
40          final SslContext sslCtx;
41          if (SSL) {
42              sslCtx = SslContextBuilder.forClient()
43                  .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
44          } else {
45              sslCtx = null;
46          }
47  
48          EventLoopGroup group = new NioEventLoopGroup();
49          try {
50              Bootstrap b = new Bootstrap();
51              b.group(group)
52               .channel(NioSocketChannel.class)
53               .handler(new FactorialClientInitializer(sslCtx));
54  
55              // Make a new connection.
56              ChannelFuture f = b.connect(HOST, PORT).sync();
57  
58              // Get the handler instance to retrieve the answer.
59              FactorialClientHandler handler =
60                  (FactorialClientHandler) f.channel().pipeline().last();
61  
62              // Print out the answer.
63              System.err.format("Factorial of %,d is: %,d", COUNT, handler.getFactorial());
64          } finally {
65              group.shutdownGracefully();
66          }
67      }
68  }