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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.echo;
17  
18  import io.netty.bootstrap.Bootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.ChannelOption;
22  import io.netty.channel.ChannelPipeline;
23  import io.netty.channel.EventLoopGroup;
24  import io.netty.channel.nio.NioEventLoopGroup;
25  import io.netty.channel.socket.SocketChannel;
26  import io.netty.channel.socket.nio.NioSocketChannel;
27  import io.netty.handler.ssl.SslContext;
28  import io.netty.handler.ssl.SslContextBuilder;
29  import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
30  
31  /**
32   * Sends one message when a connection is open and echoes back any received
33   * data to the server.  Simply put, the echo client initiates the ping-pong
34   * traffic between the echo client and server by sending the first message to
35   * the server.
36   */
37  public final class EchoClient {
38  
39      static final boolean SSL = System.getProperty("ssl") != null;
40      static final String HOST = System.getProperty("host", "127.0.0.1");
41      static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
42      static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));
43  
44      public static void main(String[] args) throws Exception {
45          // Configure SSL.git
46          final SslContext sslCtx;
47          if (SSL) {
48              sslCtx = SslContextBuilder.forClient()
49                  .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
50          } else {
51              sslCtx = null;
52          }
53  
54          // Configure the client.
55          EventLoopGroup group = new NioEventLoopGroup();
56          try {
57              Bootstrap b = new Bootstrap();
58              b.group(group)
59               .channel(NioSocketChannel.class)
60               .option(ChannelOption.TCP_NODELAY, true)
61               .handler(new ChannelInitializer<SocketChannel>() {
62                   @Override
63                   public void initChannel(SocketChannel ch) throws Exception {
64                       ChannelPipeline p = ch.pipeline();
65                       if (sslCtx != null) {
66                           p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
67                       }
68                       //p.addLast(new LoggingHandler(LogLevel.INFO));
69                       p.addLast(new EchoClientHandler());
70                   }
71               });
72  
73              // Start the client.
74              ChannelFuture f = b.connect(HOST, PORT).sync();
75  
76              // Wait until the connection is closed.
77              f.channel().closeFuture().sync();
78          } finally {
79              // Shut down the event loop to terminate all threads.
80              group.shutdownGracefully();
81          }
82      }
83  }