/*
    * 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.factorial;
  
  import java.net.InetSocketAddress;
  import java.util.concurrent.Executors;
  
  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;
  
  /**
   * Sends a sequence of integers to a {@link FactorialServer} to calculate
   * the factorial of the specified integer.
   */
  public class FactorialClient {
  
      private final String host;
      private final int port;
      private final int count;
  
      public FactorialClient(String host, int port, int count) {
          this.host = host;
          this.port = port;
          this.count = count;
      }
  
      public void run() {
          // Configure the client.
          ClientBootstrap bootstrap = new ClientBootstrap(
                  new NioClientSocketChannelFactory(
                          Executors.newCachedThreadPool(),
                          Executors.newCachedThreadPool()));
  
          // Set up the event pipeline factory.
          bootstrap.setPipelineFactory(new FactorialClientPipelineFactory(count));
  
          // Make a new connection.
          ChannelFuture connectFuture =
              bootstrap.connect(new InetSocketAddress(host, port));
  
          // Wait until the connection is made successfully.
          Channel channel = connectFuture.awaitUninterruptibly().getChannel();
  
          // Get the handler instance to retrieve the answer.
          FactorialClientHandler handler =
              (FactorialClientHandler) channel.getPipeline().getLast();
  
          // Print out the answer.
          System.err.format(
                  "Factorial of %,d is: %,d", count, handler.getFactorial());
  
          // Shut down all thread pools to exit.
          bootstrap.releaseExternalResources();
      }
  
      public static void main(String[] args) throws Exception {
          // Print usage if no argument is specified.
          if (args.length != 3) {
              System.err.println(
                      "Usage: " + FactorialClient.class.getSimpleName() +
                      " <host> <port> <count>");
              return;
          }
  
          // Parse options.
          String host = args[0];
          int port = Integer.parseInt(args[1]);
          int count = Integer.parseInt(args[2]);
          if (count <= 0) {
              throw new IllegalArgumentException("count must be a positive integer.");
          }
  
          new FactorialClient(host, port, count).run();
      }
  }