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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.example.udt.echo.message;
  
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.udt.UdtChannel;
  import io.netty.channel.udt.nio.NioUdtProvider;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  import io.netty.util.concurrent.DefaultThreadFactory;
  
  import java.util.concurrent.ThreadFactory;
  
  /**
   * UDT Message Flow Server
   * <p>
   * Echoes back any received data from a client.
   */
  public final class MsgEchoServer {
  
      static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
  
      public static void main(String[] args) throws Exception {
          final ThreadFactory acceptFactory = new DefaultThreadFactory("accept");
          final ThreadFactory connectFactory = new DefaultThreadFactory("connect");
          final NioEventLoopGroup acceptGroup =
                  new NioEventLoopGroup(1, acceptFactory, NioUdtProvider.MESSAGE_PROVIDER);
          final NioEventLoopGroup connectGroup =
                  new NioEventLoopGroup(1, connectFactory, NioUdtProvider.MESSAGE_PROVIDER);
  
          // Configure the server.
          try {
              final ServerBootstrap boot = new ServerBootstrap();
              boot.group(acceptGroup, connectGroup)
                      .channelFactory(NioUdtProvider.MESSAGE_ACCEPTOR)
                      .option(ChannelOption.SO_BACKLOG, 10)
                      .handler(new LoggingHandler(LogLevel.INFO))
                      .childHandler(new ChannelInitializer<UdtChannel>() {
                          @Override
                          public void initChannel(final UdtChannel ch)
                                  throws Exception {
                              ch.pipeline().addLast(
                                      new LoggingHandler(LogLevel.INFO),
                                      new MsgEchoServerHandler());
                          }
                      });
              // Start the server.
              final ChannelFuture future = boot.bind(PORT).sync();
              // Wait until the server socket is closed.
              future.channel().closeFuture().sync();
          } finally {
              // Shut down all event loops to terminate all threads.
              acceptGroup.shutdownGracefully();
              connectGroup.shutdownGracefully();
          }
      }
  }