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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.qotm;
    17
    18  import java.net.InetSocketAddress;
    19  import java.util.concurrent.Executors;
    20
    21  import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
    22  import org.jboss.netty.channel.ChannelPipeline;
    23  import org.jboss.netty.channel.ChannelPipelineFactory;
    24  import org.jboss.netty.channel.Channels;
    25  import org.jboss.netty.channel.FixedReceiveBufferSizePredictorFactory;
    26  import org.jboss.netty.channel.socket.DatagramChannelFactory;
    27  import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
    28  import org.jboss.netty.handler.codec.string.StringDecoder;
    29  import org.jboss.netty.handler.codec.string.StringEncoder;
    30  import org.jboss.netty.util.CharsetUtil;
    31
    32  /**
    33   * A UDP server that responds to the QOTM (quote of the moment) request to a
    34   * {@link QuoteOfTheMomentClient}.
    35   *
    36   * Inspired by <a href="http://java.sun.com/docs/books/tutorial/networking/datagrams/clientServer.html">the official Java tutorial</a>.
    37   *
    38   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    39   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    40   * @version $Rev: 2104 $, $Date: 2010-01-28 16:50:28 +0900 (Thu, 28 Jan 2010) $
    41   */
    42  public class QuoteOfTheMomentServer {
    43
    44      public static void main(String[] args) throws Exception {
    45          DatagramChannelFactory f =
    46              new NioDatagramChannelFactory(Executors.newCachedThreadPool());
    47
    48          ConnectionlessBootstrap b = new ConnectionlessBootstrap(f);
    49
    50          // Configure the pipeline factory.
    51          b.setPipelineFactory(new ChannelPipelineFactory() {
    52              public ChannelPipeline getPipeline() throws Exception {
    53                  return Channels.pipeline(
    54                          new StringEncoder(CharsetUtil.ISO_8859_1),
    55                          new StringDecoder(CharsetUtil.ISO_8859_1),
    56                          new QuoteOfTheMomentServerHandler());
    57              }
    58          });
    59
    60          // Enable broadcast
    61          b.setOption("broadcast", "false");
    62
    63          // Allow packets as large as up to 1024 bytes (default is 768).
    64          // You could increase or decrease this value to avoid truncated packets
    65          // or to improve memory footprint respectively.
    66          //
    67          // Please also note that a large UDP packet might be truncated or
    68          // dropped by your router no matter how you configured this option.
    69          // In UDP, a packet is truncated or dropped if it is larger than a
    70          // certain size, depending on router configuration.  IPv4 routers
    71          // truncate and IPv6 routers drop a large packet.  That's why it is
    72          // safe to send small packets in UDP.
    73          b.setOption(
    74                  "receiveBufferSizePredictorFactory",
    75                  new FixedReceiveBufferSizePredictorFactory(1024));
    76
    77          // Bind to the port and start the service.
    78          b.bind(new InetSocketAddress(8080));
    79      }
    80  }