/*
    * 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.echo;
  
  import java.net.InetSocketAddress;
  import java.util.concurrent.Executors;
  
  import org.jboss.netty.bootstrap.ClientBootstrap;
  import org.jboss.netty.channel.ChannelFuture;
  import org.jboss.netty.channel.ChannelPipeline;
  import org.jboss.netty.channel.ChannelPipelineFactory;
  import org.jboss.netty.channel.Channels;
  import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
  
  /**
   * 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 class EchoClient {
  
      private final String host;
      private final int port;
      private final int firstMessageSize;
  
      public EchoClient(String host, int port, int firstMessageSize) {
          this.host = host;
          this.port = port;
          this.firstMessageSize = firstMessageSize;
      }
  
      public void run() {
          // Configure the client.
          ClientBootstrap bootstrap = new ClientBootstrap(
                  new NioClientSocketChannelFactory(
                          Executors.newCachedThreadPool(),
                          Executors.newCachedThreadPool()));
  
          // Set up the pipeline factory.
          bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
              public ChannelPipeline getPipeline() throws Exception {
                  return Channels.pipeline(
                          new EchoClientHandler(firstMessageSize));
              }
          });
  
          // Start the connection attempt.
          ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));
  
          // Wait until the connection is closed or the connection attempt fails.
          future.getChannel().getCloseFuture().awaitUninterruptibly();
  
          // Shut down thread pools to exit.
          bootstrap.releaseExternalResources();
      }
  
      public static void main(String[] args) throws Exception {
          // Print usage if no argument is specified.
          if (args.length < 2 || args.length > 3) {
              System.err.println(
                      "Usage: " + EchoClient.class.getSimpleName() +
                      " <host> <port> [<first message size>]");
              return;
          }
  
          // Parse options.
          final String host = args[0];
          final int port = Integer.parseInt(args[1]);
          final int firstMessageSize;
          if (args.length == 3) {
              firstMessageSize = Integer.parseInt(args[2]);
          } else {
              firstMessageSize = 256;
          }
  
          new EchoClient(host, port, firstMessageSize).run();
      }
  }