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    1   /*
    2    * Copyright 2012 The Netty Project
    3    *
    4    * The Netty Project licenses this file to you under the Apache License,
    5    * version 2.0 (the "License"); you may not use this file except in compliance
    6    * with the 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  public class FactorialClient {
    31
    32      private final String host;
    33      private final int port;
    34      private final int count;
    35
    36      public FactorialClient(String host, int port, int count) {
    37          this.host = host;
    38          this.port = port;
    39          this.count = count;
    40      }
    41
    42      public void run() {
    43          // Configure the client.
    44          ClientBootstrap bootstrap = new ClientBootstrap(
    45                  new NioClientSocketChannelFactory(
    46                          Executors.newCachedThreadPool(),
    47                          Executors.newCachedThreadPool()));
    48
    49          // Set up the event pipeline factory.
    50          bootstrap.setPipelineFactory(new FactorialClientPipelineFactory(count));
    51
    52          // Make a new connection.
    53          ChannelFuture connectFuture =
    54              bootstrap.connect(new InetSocketAddress(host, port));
    55
    56          // Wait until the connection is made successfully.
    57          Channel channel = connectFuture.awaitUninterruptibly().getChannel();
    58
    59          // Get the handler instance to retrieve the answer.
    60          FactorialClientHandler handler =
    61              (FactorialClientHandler) channel.getPipeline().getLast();
    62
    63          // Print out the answer.
    64          System.err.format(
    65                  "Factorial of %,d is: %,d", count, handler.getFactorial());
    66
    67          // Shut down all thread pools to exit.
    68          bootstrap.releaseExternalResources();
    69      }
    70
    71      public static void main(String[] args) throws Exception {
    72          // Print usage if no argument is specified.
    73          if (args.length != 3) {
    74              System.err.println(
    75                      "Usage: " + FactorialClient.class.getSimpleName() +
    76                      " <host> <port> <count>");
    77              return;
    78          }
    79
    80          // Parse options.
    81          String host = args[0];
    82          int port = Integer.parseInt(args[1]);
    83          int count = Integer.parseInt(args[2]);
    84          if (count <= 0) {
    85              throw new IllegalArgumentException("count must be a positive integer.");
    86          }
    87
    88          new FactorialClient(host, port, count).run();
    89      }
    90  }