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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.worldclock;
17  
18  import io.netty.bootstrap.Bootstrap;
19  import io.netty.channel.Channel;
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  import java.util.Arrays;
28  import java.util.List;
29  
30  /**
31   * Sends a list of continent/city pairs to a {@link WorldClockServer} to
32   * get the local times of the specified cities.
33   */
34  public final class WorldClockClient {
35  
36      static final boolean SSL = System.getProperty("ssl") != null;
37      static final String HOST = System.getProperty("host", "127.0.0.1");
38      static final int PORT = Integer.parseInt(System.getProperty("port", "8463"));
39      static final List<String> CITIES = Arrays.asList(System.getProperty(
40              "cities", "Asia/Seoul,Europe/Berlin,America/Los_Angeles").split(","));
41  
42      public static void main(String[] args) throws Exception {
43          // Configure SSL.
44          final SslContext sslCtx;
45          if (SSL) {
46              sslCtx = SslContextBuilder.forClient()
47                  .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
48          } else {
49              sslCtx = null;
50          }
51  
52          EventLoopGroup group = new NioEventLoopGroup();
53          try {
54              Bootstrap b = new Bootstrap();
55              b.group(group)
56               .channel(NioSocketChannel.class)
57               .handler(new WorldClockClientInitializer(sslCtx));
58  
59              // Make a new connection.
60              Channel ch = b.connect(HOST, PORT).sync().channel();
61  
62              // Get the handler instance to initiate the request.
63              WorldClockClientHandler handler = ch.pipeline().get(WorldClockClientHandler.class);
64  
65              // Request and get the response.
66              List<String> response = handler.getLocalTimes(CITIES);
67  
68              // Close the connection.
69              ch.close();
70  
71              // Print the response at last but not least.
72              for (int i = 0; i < CITIES.size(); i ++) {
73                  System.out.format("%28s: %s%n", CITIES.get(i), response.get(i));
74              }
75          } finally {
76              group.shutdownGracefully();
77          }
78      }
79  }