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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.echo;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.example.util.ServerUtil;
  import io.netty.handler.ssl.SslContext;
  
  /**
   * 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 EchoClient {
  
      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 SSL.git
          final SslContext sslCtx = ServerUtil.buildSslContext();
  
          // Configure the client.
          EventLoopGroup group = new NioEventLoopGroup();
          try {
              Bootstrap b = new Bootstrap();
              b.group(group)
               .channel(NioSocketChannel.class)
               .option(ChannelOption.TCP_NODELAY, true)
               .handler(new ChannelInitializer<SocketChannel>() {
                   @Override
                   public void initChannel(SocketChannel ch) throws Exception {
                       ChannelPipeline p = ch.pipeline();
                       if (sslCtx != null) {
                           p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
                       }
                       //p.addLast(new LoggingHandler(LogLevel.INFO));
                       p.addLast(new EchoClientHandler());
                   }
               });
  
              // Start the client.
              ChannelFuture f = b.connect(HOST, PORT).sync();
  
              // Wait until the connection is closed.
              f.channel().closeFuture().sync();
          } finally {
              // Shut down the event loop to terminate all threads.
              group.shutdownGracefully();
          }
      }
  }