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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.core.nio.udp;
    21
    22  import java.io.IOException;
    23  import java.net.InetSocketAddress;
    24  import java.net.SocketAddress;
    25  import java.util.HashMap;
    26  import java.util.Map;
    27
    28  import org.apache.mina.core.BenchmarkServer;
    29  import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
    30  import org.jboss.netty.buffer.ChannelBuffer;
    31  import org.jboss.netty.buffer.ChannelBuffers;
    32  import org.jboss.netty.channel.ChannelFactory;
    33  import org.jboss.netty.channel.ChannelHandlerContext;
    34  import org.jboss.netty.channel.ChannelPipeline;
    35  import org.jboss.netty.channel.ChannelPipelineFactory;
    36  import org.jboss.netty.channel.ChannelStateEvent;
    37  import org.jboss.netty.channel.Channels;
    38  import org.jboss.netty.channel.ChildChannelStateEvent;
    39  import org.jboss.netty.channel.ExceptionEvent;
    40  import org.jboss.netty.channel.MessageEvent;
    41  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    42  import org.jboss.netty.channel.group.ChannelGroup;
    43  import org.jboss.netty.channel.group.DefaultChannelGroup;
    44  import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
    45
    46  /**
    47   * A Netty 3 based UDP server
    48   *
    49   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
    50   */
    51  public class Netty3UdpBenchmarkServer implements BenchmarkServer {
    52
    53      private static enum State {
    54          WAIT_FOR_FIRST_BYTE_LENGTH, WAIT_FOR_SECOND_BYTE_LENGTH, WAIT_FOR_THIRD_BYTE_LENGTH, WAIT_FOR_FOURTH_BYTE_LENGTH, READING
    55      }
    56
    57      private static final ChannelBuffer ACK = ChannelBuffers.buffer(1);
    58
    59      static {
    60          ACK.writeByte(0);
    61      }
    62
    63      private static final String STATE_ATTRIBUTE = Netty3UdpBenchmarkServer.class.getName() + ".state";
    64
    65      private static final String LENGTH_ATTRIBUTE = Netty3UdpBenchmarkServer.class.getName() + ".length";
    66
    67      private ChannelFactory factory;
    68
    69      private ChannelGroup allChannels = new DefaultChannelGroup();
    70
    71      /**
    72       * Allocate a map as attachment for storing attributes.
    73       *
    74       * @param ctx the channel context
    75       * @return the map from the attachment
    76       */
    77      protected static Map<String, Object> getAttributesMap(ChannelHandlerContext ctx) {
    78          Map<String, Object> map = (Map<String, Object>) ctx.getAttachment();
    79          if (map == null) {
    80              map = new HashMap<String, Object>();
    81              ctx.setAttachment(map);
    82          }
    83          return map;
    84      }
    85
    86      private static void setAttribute(ChannelHandlerContext ctx, String name, Object value) {
    87          getAttributesMap(ctx).put(name, value);
    88      }
    89
    90      private static Object getAttribute(ChannelHandlerContext ctx, String name) {
    91          return getAttributesMap(ctx).get(name);
    92      }
    93
    94      /**
    95       * {@inheritDoc}
    96       */
    97      public void start(int port) throws IOException {
    98          factory = new NioDatagramChannelFactory();
    99          ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(factory);
    100         bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
    101             public ChannelPipeline getPipeline() throws Exception {
    102                 return Channels.pipeline(new SimpleChannelUpstreamHandler() {
    103                     @Override
    104                     public void childChannelOpen(ChannelHandlerContext ctx, ChildChannelStateEvent e) throws Exception {
    105                         System.out.println("childChannelOpen");
    106                         setAttribute(ctx, STATE_ATTRIBUTE, State.WAIT_FOR_FIRST_BYTE_LENGTH);
    107                     }
    108
    109                     @Override
    110                     public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
    111                         System.out.println("channelOpen");
    112                         setAttribute(ctx, STATE_ATTRIBUTE, State.WAIT_FOR_FIRST_BYTE_LENGTH);
    113                         allChannels.add(ctx.getChannel());
    114                     }
    115
    116                     @Override
    117                     public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
    118                         if (e.getMessage() instanceof ChannelBuffer) {
    119                             ChannelBuffer buffer = (ChannelBuffer) e.getMessage();
    120
    121                             State state = (State) getAttribute(ctx, STATE_ATTRIBUTE);
    122                             int length = 0;
    123                             if (getAttributesMap(ctx).containsKey(LENGTH_ATTRIBUTE)) {
    124                                 length = (Integer) getAttribute(ctx, LENGTH_ATTRIBUTE);
    125                             }
    126                             while (buffer.readableBytes() > 0) {
    127                                 switch (state) {
    128                                 case WAIT_FOR_FIRST_BYTE_LENGTH:
    129                                     length = (buffer.readByte() & 255) << 24;
    130                                     state = State.WAIT_FOR_SECOND_BYTE_LENGTH;
    131                                     break;
    132                                 case WAIT_FOR_SECOND_BYTE_LENGTH:
    133                                     length += (buffer.readByte() & 255) << 16;
    134                                     state = State.WAIT_FOR_THIRD_BYTE_LENGTH;
    135                                     break;
    136                                 case WAIT_FOR_THIRD_BYTE_LENGTH:
    137                                     length += (buffer.readByte() & 255) << 8;
    138                                     state = State.WAIT_FOR_FOURTH_BYTE_LENGTH;
    139                                     break;
    140                                 case WAIT_FOR_FOURTH_BYTE_LENGTH:
    141                                     length += (buffer.readByte() & 255);
    142                                     state = State.READING;
    143                                     if ((length == 0) && (buffer.readableBytes() == 0)) {
    144                                         ctx.getChannel().write(ACK.slice());
    145                                         state = State.WAIT_FOR_FIRST_BYTE_LENGTH;
    146                                     }
    147                                     break;
    148                                 case READING:
    149                                     int remaining = buffer.readableBytes();
    150                                     if (length > remaining) {
    151                                         length -= remaining;
    152                                         buffer.skipBytes(remaining);
    153                                     } else {
    154                                         buffer.skipBytes(length);
    155                                         SocketAddress remoteAddress = e.getRemoteAddress();
    156                                         ctx.getChannel().write(ACK.slice(), remoteAddress);
    157                                         state = State.WAIT_FOR_FIRST_BYTE_LENGTH;
    158                                         length = 0;
    159                                     }
    160                                 }
    161                             }
    162                             setAttribute(ctx, STATE_ATTRIBUTE, state);
    163                             setAttribute(ctx, LENGTH_ATTRIBUTE, length);
    164                         }
    165                     }
    166
    167                     @Override
    168                     public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
    169                         allChannels.remove(ctx.getChannel());
    170                     }
    171
    172                     @Override
    173                     public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
    174                         e.getCause().printStackTrace();
    175                     }
    176                 });
    177             }
    178         });
    179         allChannels.add(bootstrap.bind(new InetSocketAddress(port)));
    180     }
    181
    182     /**
    183      * {@inheritedDoc}
    184      */
    185     public void stop() throws IOException {
    186         allChannels.disconnect().awaitUninterruptibly();
    187         factory.shutdown();
    188         factory.releaseExternalResources();
    189     }
    190 }