UnreliableCommandDatagramChannel


1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.activemq.transport.reliable;
18  
19  import org.apache.activemq.openwire.OpenWireFormat;
20  import org.apache.activemq.transport.udp.ByteBufferPool;
21  import org.apache.activemq.transport.udp.CommandDatagramChannel;
22  import org.apache.activemq.transport.udp.DatagramHeaderMarshaller;
23  import org.apache.activemq.transport.udp.UdpTransport;
24  import org.apache.commons.logging.Log;
25  import org.apache.commons.logging.LogFactory;
26  
27  import java.io.IOException  ;
28  import java.net.SocketAddress  ;
29  import java.nio.ByteBuffer  ;
30  import java.nio.channels.DatagramChannel  ;
31  
32  /**
33   * 
34   * @version $Revision: $
35   */
36  public class UnreliableCommandDatagramChannel extends CommandDatagramChannel {
37  
38      private static final Log log = LogFactory.getLog(UnreliableCommandDatagramChannel.class);
39  
40      private DropCommandStrategy dropCommandStrategy;
41  
42      public UnreliableCommandDatagramChannel(UdpTransport transport, OpenWireFormat wireFormat, int datagramSize,
43              SocketAddress   targetAddress, DatagramHeaderMarshaller headerMarshaller, ReplayBuffer replayBuffer, DatagramChannel channel,
44              ByteBufferPool bufferPool, DropCommandStrategy strategy) {
45          super(transport, wireFormat, datagramSize, targetAddress, headerMarshaller, channel, bufferPool);
46          this.dropCommandStrategy = strategy;
47      }
48  
49      protected void sendWriteBuffer(int commandId, SocketAddress   address, ByteBuffer   writeBuffer, boolean redelivery) throws IOException   {
50          if (dropCommandStrategy.shouldDropCommand(commandId, address, redelivery)) {
51              writeBuffer.flip();
52              log.info("Dropping datagram with command: " + commandId);
53              
54              // lets still add it to the replay buffer though!
55              getReplayBuffer().addBuffer(commandId, writeBuffer);
56          }
57          else {
58              super.sendWriteBuffer(commandId, address, writeBuffer, redelivery);
59          }
60      }
61  }
62
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