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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.qotm;
    17
    18  import java.net.InetSocketAddress;
    19
    20  import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
    21  import org.jboss.netty.channel.ChannelPipeline;
    22  import org.jboss.netty.channel.ChannelPipelineFactory;
    23  import org.jboss.netty.channel.Channels;
    24  import org.jboss.netty.channel.FixedReceiveBufferSizePredictorFactory;
    25  import org.jboss.netty.channel.socket.DatagramChannelFactory;
    26  import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
    27  import org.jboss.netty.handler.codec.string.StringDecoder;
    28  import org.jboss.netty.handler.codec.string.StringEncoder;
    29  import org.jboss.netty.util.CharsetUtil;
    30
    31  /**
    32   * A UDP server that responds to the QOTM (quote of the moment) request to a
    33   * {@link QuoteOfTheMomentClient}.
    34   *
    35   * Inspired by <a href="http://goo.gl/BsXVR">the official Java tutorial</a>.
    36   */
    37  public class QuoteOfTheMomentServer {
    38
    39      private final int port;
    40
    41      public QuoteOfTheMomentServer(int port) {
    42          this.port = port;
    43      }
    44
    45      public void run() {
    46          DatagramChannelFactory f = new NioDatagramChannelFactory();
    47          ConnectionlessBootstrap b = new ConnectionlessBootstrap(f);
    48
    49          // Configure the pipeline factory.
    50          b.setPipelineFactory(new ChannelPipelineFactory() {
    51              public ChannelPipeline getPipeline() throws Exception {
    52                  return Channels.pipeline(
    53                          new StringEncoder(CharsetUtil.ISO_8859_1),
    54                          new StringDecoder(CharsetUtil.ISO_8859_1),
    55                          new QuoteOfTheMomentServerHandler());
    56              }
    57          });
    58
    59          // Enable broadcast
    60          b.setOption("broadcast", "false");
    61
    62          // Allow packets as large as up to 1024 bytes (default is 768).
    63          // You could increase or decrease this value to avoid truncated packets
    64          // or to improve memory footprint respectively.
    65          //
    66          // Please also note that a large UDP packet might be truncated or
    67          // dropped by your router no matter how you configured this option.
    68          // In UDP, a packet is truncated or dropped if it is larger than a
    69          // certain size, depending on router configuration.  IPv4 routers
    70          // truncate and IPv6 routers drop a large packet.  That's why it is
    71          // safe to send small packets in UDP.
    72          b.setOption(
    73                  "receiveBufferSizePredictorFactory",
    74                  new FixedReceiveBufferSizePredictorFactory(1024));
    75
    76          // Bind to the port and start the service.
    77          b.bind(new InetSocketAddress(port));
    78      }
    79
    80      public static void main(String[] args) throws Exception {
    81          int port;
    82          if (args.length > 0) {
    83              port = Integer.parseInt(args[0]);
    84          } else {
    85              port = 8080;
    86          }
    87          new QuoteOfTheMomentServer(port).run();
    88      }
    89  }