mcs/class/Mono.Messaging.RabbitMQ/Mono.Messaging.RabbitMQ/RabbitMQMessagingProvider.cs

   1 //
   2 // Mono.Messaging.RabbitMQ
   3 //
   4 // Authors:
   5 //        Michael Barker (mike@middlesoft.co.uk)
   6 //
   7 // (C) 2008 Michael Barker
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Collections;
  33 using System.Net;
  34 using System.Net.Sockets;
  35 using System.Threading;
  36
  37 using Mono.Messaging;
  38
  39 using RabbitMQ.Client;
  40
  41 namespace Mono.Messaging.RabbitMQ {
  42
  43         public class RabbitMQMessagingProvider : IMessagingProvider {
  44
  45                 private int txCounter = 0;
  46                 private readonly uint localIp;
  47                 private readonly MessagingContextPool contextPool;
  48
  49                 public RabbitMQMessagingProvider ()
  50                 {
  51                         localIp = GetLocalIP ();
  52                         contextPool = new MessagingContextPool (new MessageFactory (this),
  53                                                                                                         CreateConnection);
  54                 }
  55
  56                 private static uint GetLocalIP ()
  57                 {
  58                         String strHostName = Dns.GetHostName ();
  59                         IPHostEntry ipEntry = Dns.GetHostByName (strHostName);
  60                         foreach (IPAddress ip in ipEntry.AddressList) {
  61                                 if (AddressFamily.InterNetwork == ip.AddressFamily) {
  62                                         byte[] addr = ip.GetAddressBytes ();
  63                                         uint localIP = 0;
  64                                         for (int i = 0; i < 4 && i < addr.Length; i++) {
  65                                                 localIP += (uint) (addr[i] << 8 * (3 - i));
  66                                         }
  67                                         return localIP;
  68                                 }
  69                         }
  70                         return 0;
  71                 }
  72
  73                 public IMessage CreateMessage ()
  74                 {
  75                         return new MessageBase ();
  76                 }
  77
  78                 public IMessageQueueTransaction CreateMessageQueueTransaction ()
  79                 {
  80                         Interlocked.Increment (ref txCounter);
  81                         string txId = localIp.ToString () + txCounter.ToString ();
  82
  83                         return new RabbitMQMessageQueueTransaction (txId, contextPool);
  84                 }
  85
  86                 public IMessagingContext CreateContext (string host)
  87                 {
  88                         return contextPool.GetContext (host);
  89                 }
  90
  91                 private IConnection CreateConnection (string host)
  92                 {
  93                         ConnectionFactory cf = new ConnectionFactory ();
  94                         cf.Address = host;
  95                         return cf.CreateConnection ();
  96                 }
  97
  98                 public void DeleteQueue (QueueReference qRef)
  99                 {
 100                         RabbitMQMessageQueue.Delete (qRef);
 101                 }
 102
 103                 private readonly IDictionary queues = new Hashtable ();
 104                 private readonly ReaderWriterLock qLock = new ReaderWriterLock ();
 105                 private const int TIMEOUT = 15000;
 106
 107                 public IMessageQueue[] GetPublicQueues ()
 108                 {
 109                         IMessageQueue[] qs;
 110                         qLock.AcquireReaderLock (TIMEOUT);
 111                         try {
 112                                 ICollection qCollection = queues.Values;
 113                                 qs = new IMessageQueue[qCollection.Count];
 114                                 qCollection.CopyTo (qs, 0);
 115                                 return qs;
 116                         } finally {
 117                                 qLock.ReleaseReaderLock ();
 118                         }
 119                 }
 120
 121                 public bool Exists (QueueReference qRef)
 122                 {
 123                         qLock.AcquireReaderLock (TIMEOUT);
 124                         try {
 125                                 return queues.Contains (qRef);
 126                         } finally {
 127                                 qLock.ReleaseReaderLock ();
 128                         }
 129                 }
 130
 131                 public IMessageQueue CreateMessageQueue (QueueReference qRef,
 132                                                          bool transactional)
 133                 {
 134                         qLock.AcquireWriterLock (TIMEOUT);
 135                         try {
 136                                 IMessageQueue mq = new RabbitMQMessageQueue (this, qRef, transactional);
 137                                 queues[qRef] = mq;
 138                                 return mq;
 139                         } finally {
 140                                 qLock.ReleaseWriterLock ();
 141                         }
 142                 }
 143
 144                 public IMessageQueue GetMessageQueue (QueueReference qRef)
 145                 {
 146                         qLock.AcquireReaderLock (TIMEOUT);
 147                         try {
 148                                 if (queues.Contains (qRef))
 149                                         return (IMessageQueue) queues[qRef];
 150                                 else {
 151                                         LockCookie lc = qLock.UpgradeToWriterLock (TIMEOUT);
 152                                         try {
 153                                                 IMessageQueue mq = new RabbitMQMessageQueue (this, qRef, false);
 154                                                 queues[qRef] = mq;
 155                                                 return mq;
 156                                         } finally {
 157                                                 qLock.DowngradeFromWriterLock (ref lc);
 158                                         }
 159                                 }
 160                         } finally {
 161                                 qLock.ReleaseReaderLock ();
 162                         }
 163                 }
 164
 165
 166         }
 167 }