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