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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.factorial;
  
  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.net.InetSocketAddress;
  import java.util.concurrent.Executors;
  
  /**
   * Sends a sequence of integers to a {@link FactorialServer} to calculate
   * the factorial of the specified integer.
   */
  public final class FactorialClient {
  
      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", "8322"));
      static final int COUNT = Integer.parseInt(System.getProperty("count", "1000"));
  
      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 bootstrap.
          ClientBootstrap bootstrap = new ClientBootstrap(
                  new NioClientSocketChannelFactory(
                          Executors.newCachedThreadPool(),
                          Executors.newCachedThreadPool()));
  
          try {
              bootstrap.setPipelineFactory(new FactorialClientPipelineFactory(sslCtx));
  
              // Make a new connection.
              ChannelFuture connectFuture = bootstrap.connect(new InetSocketAddress(HOST, PORT));
  
              // Wait until the connection is made successfully.
              Channel channel = connectFuture.sync().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());
          } finally {
              // Shut down all thread pools to exit.
              bootstrap.releaseExternalResources();
          }
      }
  }