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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.udt.echo.bytes;
17  
18  import io.netty.bootstrap.Bootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.nio.NioEventLoopGroup;
22  import io.netty.channel.udt.UdtChannel;
23  import io.netty.channel.udt.nio.NioUdtProvider;
24  import io.netty.handler.logging.LogLevel;
25  import io.netty.handler.logging.LoggingHandler;
26  import io.netty.util.concurrent.DefaultExecutorServiceFactory;
27  import io.netty.util.concurrent.ExecutorServiceFactory;
28  
29  /**
30   * UDT Byte Stream Client
31   * <p>
32   * Sends one message when a connection is open and echoes back any received data
33   * to the server. Simply put, the echo client initiates the ping-pong traffic
34   * between the echo client and server by sending the first message to the
35   * server.
36   */
37  public final class ByteEchoClient {
38  
39      static final String HOST = System.getProperty("host", "127.0.0.1");
40      static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
41      static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));
42  
43      public static void main(String[] args) throws Exception {
44          // Configure the client.
45          final ExecutorServiceFactory connectFactory = new DefaultExecutorServiceFactory("connect");
46          final NioEventLoopGroup connectGroup =
47                  new NioEventLoopGroup(1, connectFactory, NioUdtProvider.BYTE_PROVIDER);
48  
49          try {
50              final Bootstrap boot = new Bootstrap();
51              boot.group(connectGroup)
52                      .channelFactory(NioUdtProvider.BYTE_CONNECTOR)
53                      .handler(new ChannelInitializer<UdtChannel>() {
54                          @Override
55                          public void initChannel(final UdtChannel ch)
56                                  throws Exception {
57                              ch.pipeline().addLast(
58                                      new LoggingHandler(LogLevel.INFO),
59                                      new ByteEchoClientHandler());
60                          }
61                      });
62              // Start the client.
63              final ChannelFuture f = boot.connect(HOST, PORT).sync();
64              // Wait until the connection is closed.
65              f.channel().closeFuture().sync();
66          } finally {
67              // Shut down the event loop to terminate all threads.
68              connectGroup.shutdownGracefully();
69          }
70      }
71  }