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    1   /*
    2    * Copyright 2009 Red Hat, Inc.
    3    *
    4    * Red Hat licenses this file to you under the Apache License, version 2.0
    5    * (the "License"); you may not use this file except in compliance with the
    6    * License.  You may obtain a copy of the License at:
    7    *
    8    *    http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    13   * License for the specific language governing permissions and limitations
    14   * under the License.
    15   */
    16  package org.jboss.netty.example.factorial;
    17
    18  import java.net.InetSocketAddress;
    19  import java.util.concurrent.Executors;
    20
    21  import org.jboss.netty.bootstrap.ClientBootstrap;
    22  import org.jboss.netty.channel.Channel;
    23  import org.jboss.netty.channel.ChannelFuture;
    24  import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
    25
    26  /**
    27   * Sends a sequence of integers to a {@link FactorialServer} to calculate
    28   * the factorial of the specified integer.
    29   *
    30   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    31   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    32   *
    33   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
    34   */
    35  public class FactorialClient {
    36
    37      public static void main(String[] args) throws Exception {
    38          // Print usage if no argument is specified.
    39          if (args.length != 3) {
    40              System.err.println(
    41                      "Usage: " + FactorialClient.class.getSimpleName() +
    42                      " <host> <port> <count>");
    43              return;
    44          }
    45
    46          // Parse options.
    47          String host = args[0];
    48          int port = Integer.parseInt(args[1]);
    49          int count = Integer.parseInt(args[2]);
    50          if (count <= 0) {
    51              throw new IllegalArgumentException("count must be a positive integer.");
    52          }
    53
    54          // Configure the client.
    55          ClientBootstrap bootstrap = new ClientBootstrap(
    56                  new NioClientSocketChannelFactory(
    57                          Executors.newCachedThreadPool(),
    58                          Executors.newCachedThreadPool()));
    59
    60          // Set up the event pipeline factory.
    61          bootstrap.setPipelineFactory(new FactorialClientPipelineFactory(count));
    62
    63          // Make a new connection.
    64          ChannelFuture connectFuture =
    65              bootstrap.connect(new InetSocketAddress(host, port));
    66
    67          // Wait until the connection is made successfully.
    68          Channel channel = connectFuture.awaitUninterruptibly().getChannel();
    69
    70          // Get the handler instance to retrieve the answer.
    71          FactorialClientHandler handler =
    72              (FactorialClientHandler) channel.getPipeline().getLast();
    73
    74          // Print out the answer.
    75          System.err.format(
    76                  "Factorial of %,d is: %,d", count, handler.getFactorial());
    77
    78          // Shut down all thread pools to exit.
    79          bootstrap.releaseExternalResources();
    80      }
    81  }