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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.DefaultThreadFactory;
27  
28  import java.util.concurrent.ThreadFactory;
29  
30  /**
31   * UDT Byte Stream Client
32   * <p>
33   * Sends one message when a connection is open and echoes back any received data
34   * to the server. Simply put, the echo client initiates the ping-pong traffic
35   * between the echo client and server by sending the first message to the
36   * server.
37   */
38  public final class ByteEchoClient {
39  
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 the client.
46          final ThreadFactory connectFactory = new DefaultThreadFactory("connect");
47          final NioEventLoopGroup connectGroup = new NioEventLoopGroup(1,
48                  connectFactory, NioUdtProvider.BYTE_PROVIDER);
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  }