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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:
    *
    *   http://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 org.jboss.netty.example.telnet;
  
  import org.jboss.netty.bootstrap.ClientBootstrap;
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.ChannelFuture;
  import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
  import org.jboss.netty.handler.ssl.SslContext;
  import org.jboss.netty.handler.ssl.util.InsecureTrustManagerFactory;
  
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.net.InetSocketAddress;
  import java.util.concurrent.Executors;
  
  /**
   * Simplistic telnet client.
   */
  public final class TelnetClient {
  
      static final boolean SSL = System.getProperty("ssl") != null;
      static final String HOST = System.getProperty("host", "127.0.0.1");
      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8992" : "8023"));
  
      public static void main(String[] args) throws Exception {
          // Configure SSL.
          final SslContext sslCtx;
          if (SSL) {
              sslCtx = SslContext.newClientContext(InsecureTrustManagerFactory.INSTANCE);
          } else {
              sslCtx = null;
          }
  
          // Configure the client.
          ClientBootstrap bootstrap = new ClientBootstrap(
                  new NioClientSocketChannelFactory(
                          Executors.newCachedThreadPool(),
                          Executors.newCachedThreadPool()));
  
          try {
              // Configure the pipeline factory.
              bootstrap.setPipelineFactory(new TelnetClientPipelineFactory(sslCtx));
  
              // Start the connection attempt.
              ChannelFuture future = bootstrap.connect(new InetSocketAddress(HOST, PORT));
  
              // Wait until the connection attempt succeeds or fails.
              Channel channel = future.sync().getChannel();
  
              // Read commands from the stdin.
              ChannelFuture lastWriteFuture = null;
              BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
              for (;;) {
                  String line = in.readLine();
                  if (line == null) {
                      break;
                  }
  
                  // Sends the received line to the server.
                  lastWriteFuture = channel.write(line + "\r\n");
  
                  // If user typed the 'bye' command, wait until the server closes
                  // the connection.
                  if ("bye".equals(line.toLowerCase())) {
                      channel.getCloseFuture().sync();
                      break;
                  }
              }
  
              // Wait until all messages are flushed before closing the channel.
              if (lastWriteFuture != null) {
                  lastWriteFuture.sync();
              }
  
              // Close the connection.  Make sure the close operation ends because
              // all I/O operations are asynchronous in Netty.
              channel.close().sync();
          } finally {
              // Shut down all thread pools to exit.
              bootstrap.releaseExternalResources();
          }
      }
  }