View Javadoc
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.util.InsecureTrustManagerFactory;
25  
26  import java.util.Arrays;
27  import java.util.List;
28  
29  /**
30   * Sends a list of continent/city pairs to a {@link WorldClockServer} to
31   * get the local times of the specified cities.
32   */
33  public final class WorldClockClient {
34  
35      static final boolean SSL = System.getProperty("ssl") != null;
36      static final String HOST = System.getProperty("host", "127.0.0.1");
37      static final int PORT = Integer.parseInt(System.getProperty("port", "8463"));
38      static final List<String> CITIES = Arrays.asList(System.getProperty(
39              "cities", "Asia/Seoul,Europe/Berlin,America/Los_Angeles").split(","));
40  
41      public static void main(String[] args) throws Exception {
42          // Configure SSL.
43          final SslContext sslCtx;
44          if (SSL) {
45              sslCtx = SslContext.newClientContext(InsecureTrustManagerFactory.INSTANCE);
46          } else {
47              sslCtx = null;
48          }
49  
50          EventLoopGroup group = new NioEventLoopGroup();
51          try {
52              Bootstrap b = new Bootstrap();
53              b.group(group)
54               .channel(NioSocketChannel.class)
55               .handler(new WorldClockClientInitializer(sslCtx));
56  
57              // Make a new connection.
58              Channel ch = b.connect(HOST, PORT).sync().channel();
59  
60              // Get the handler instance to initiate the request.
61              WorldClockClientHandler handler = ch.pipeline().get(WorldClockClientHandler.class);
62  
63              // Request and get the response.
64              List<String> response = handler.getLocalTimes(CITIES);
65  
66              // Close the connection.
67              ch.close();
68  
69              // Print the response at last but not least.
70              for (int i = 0; i < CITIES.size(); i ++) {
71                  System.out.format("%28s: %s%n", CITIES.get(i), response.get(i));
72              }
73          } finally {
74              group.shutdownGracefully();
75          }
76      }
77  }