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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.message;
17  
18  import io.netty.bootstrap.ServerBootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.ChannelOption;
22  import io.netty.channel.nio.NioEventLoopGroup;
23  import io.netty.channel.udt.UdtChannel;
24  import io.netty.channel.udt.nio.NioUdtProvider;
25  import io.netty.handler.logging.LogLevel;
26  import io.netty.handler.logging.LoggingHandler;
27  import io.netty.util.concurrent.DefaultExecutorServiceFactory;
28  import io.netty.util.concurrent.ExecutorServiceFactory;
29  
30  /**
31   * UDT Message Flow Server
32   * <p>
33   * Echoes back any received data from a client.
34   */
35  public final class MsgEchoServer {
36  
37      static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
38  
39      public static void main(String[] args) throws Exception {
40          final ExecutorServiceFactory acceptFactory = new DefaultExecutorServiceFactory("accept");
41          final ExecutorServiceFactory connectFactory = new DefaultExecutorServiceFactory("connect");
42          final NioEventLoopGroup acceptGroup =
43                  new NioEventLoopGroup(1, acceptFactory, NioUdtProvider.MESSAGE_PROVIDER);
44          final NioEventLoopGroup connectGroup =
45                  new NioEventLoopGroup(1, connectFactory, NioUdtProvider.MESSAGE_PROVIDER);
46  
47          // Configure the server.
48          try {
49              final ServerBootstrap boot = new ServerBootstrap();
50              boot.group(acceptGroup, connectGroup)
51                      .channelFactory(NioUdtProvider.MESSAGE_ACCEPTOR)
52                      .option(ChannelOption.SO_BACKLOG, 10)
53                      .handler(new LoggingHandler(LogLevel.INFO))
54                      .childHandler(new ChannelInitializer<UdtChannel>() {
55                          @Override
56                          public void initChannel(final UdtChannel ch)
57                                  throws Exception {
58                              ch.pipeline().addLast(
59                                      new LoggingHandler(LogLevel.INFO),
60                                      new MsgEchoServerHandler());
61                          }
62                      });
63              // Start the server.
64              final ChannelFuture future = boot.bind(PORT).sync();
65              // Wait until the server socket is closed.
66              future.channel().closeFuture().sync();
67          } finally {
68              // Shut down all event loops to terminate all threads.
69              acceptGroup.shutdownGracefully();
70              connectGroup.shutdownGracefully();
71          }
72      }
73  }