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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.Bootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  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;
  import java.util.logging.Logger;
  
  /**
   * UDT Message Flow client
   * <p>
   * Sends one message when a connection is open and echoes back any received data
   * to the server. Simply put, the echo client initiates the ping-pong traffic
   * between the echo client and server by sending the first message to the
   * server.
   */
  public final class MsgEchoClient {
  
      private static final Logger log = Logger.getLogger(MsgEchoClient.class.getName());
  
      static final String HOST = System.getProperty("host", "127.0.0.1");
      static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
      static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));
  
      public static void main(String[] args) throws Exception {
  
          // Configure the client.
          final ThreadFactory connectFactory = new DefaultThreadFactory("connect");
          final NioEventLoopGroup connectGroup = new NioEventLoopGroup(1,
                  connectFactory, NioUdtProvider.MESSAGE_PROVIDER);
          try {
              final Bootstrap boot = new Bootstrap();
              boot.group(connectGroup)
                      .channelFactory(NioUdtProvider.MESSAGE_CONNECTOR)
                      .handler(new ChannelInitializer<UdtChannel>() {
                          @Override
                          public void initChannel(final UdtChannel ch)
                                  throws Exception {
                              ch.pipeline().addLast(
                                      new LoggingHandler(LogLevel.INFO),
                                      new MsgEchoClientHandler());
                          }
                      });
              // Start the client.
              final ChannelFuture f = boot.connect(HOST, PORT).sync();
              // Wait until the connection is closed.
              f.channel().closeFuture().sync();
          } finally {
              // Shut down the event loop to terminate all threads.
              connectGroup.shutdownGracefully();
          }
      }
  }