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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    *   https://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.example.util.ServerUtil;
24  import io.netty.handler.ssl.SslContext;
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 String HOST = System.getProperty("host", "127.0.0.1");
33      static final int PORT = Integer.parseInt(System.getProperty("port", "8322"));
34      static final int COUNT = Integer.parseInt(System.getProperty("count", "1000"));
35  
36      public static void main(String[] args) throws Exception {
37          // Configure SSL.
38          final SslContext sslCtx = ServerUtil.buildSslContext();
39  
40          EventLoopGroup group = new NioEventLoopGroup();
41          try {
42              Bootstrap b = new Bootstrap();
43              b.group(group)
44               .channel(NioSocketChannel.class)
45               .handler(new FactorialClientInitializer(sslCtx));
46  
47              // Make a new connection.
48              ChannelFuture f = b.connect(HOST, PORT).sync();
49  
50              // Get the handler instance to retrieve the answer.
51              FactorialClientHandler handler =
52                  (FactorialClientHandler) f.channel().pipeline().last();
53  
54              // Print out the answer.
55              System.err.format("Factorial of %,d is: %,d", COUNT, handler.getFactorial());
56          } finally {
57              group.shutdownGracefully();
58          }
59      }
60  }