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 Guid localId;
  47                 private readonly MessagingContextPool contextPool;
  48
  49                 public RabbitMQMessagingProvider ()
  50                 {
  51                         localId = Guid.NewGuid ();
  52                         contextPool = new MessagingContextPool (new MessageFactory (this),
  53                                                                                                         CreateConnection);
  54                 }
  55
  56                 public IMessage CreateMessage ()
  57                 {
  58                         return new MessageBase ();
  59                 }
  60
  61                 public IMessageQueueTransaction CreateMessageQueueTransaction ()
  62                 {
  63                         Interlocked.Increment (ref txCounter);
  64                         string txId = localId.ToString () + "_" + txCounter.ToString ();
  65
  66                         return new RabbitMQMessageQueueTransaction (txId, contextPool);
  67                 }
  68
  69                 public IMessagingContext CreateContext (string host)
  70                 {
  71                         return contextPool.GetContext (host);
  72                 }
  73
  74                 private IConnection CreateConnection (string host)
  75                 {
  76                         ConnectionFactory cf = new ConnectionFactory ();
  77                         cf.Address = host;
  78                         return cf.CreateConnection ();
  79                 }
  80
  81                 public void DeleteQueue (QueueReference qRef)
  82                 {
  83                         RabbitMQMessageQueue.Delete (qRef);
  84                 }
  85
  86                 private readonly IDictionary queues = new Hashtable ();
  87                 private readonly ReaderWriterLock qLock = new ReaderWriterLock ();
  88                 private const int TIMEOUT = 15000;
  89
  90                 public IMessageQueue[] GetPublicQueues ()
  91                 {
  92                         IMessageQueue[] qs;
  93                         qLock.AcquireReaderLock (TIMEOUT);
  94                         try {
  95                                 ICollection qCollection = queues.Values;
  96                                 qs = new IMessageQueue[qCollection.Count];
  97                                 qCollection.CopyTo (qs, 0);
  98                                 return qs;
  99                         } finally {
 100                                 qLock.ReleaseReaderLock ();
 101                         }
 102                 }
 103
 104                 public bool Exists (QueueReference qRef)
 105                 {
 106                         qLock.AcquireReaderLock (TIMEOUT);
 107                         try {
 108                                 return queues.Contains (qRef);
 109                         } finally {
 110                                 qLock.ReleaseReaderLock ();
 111                         }
 112                 }
 113
 114                 public IMessageQueue CreateMessageQueue (QueueReference qRef,
 115                                                          bool transactional)
 116                 {
 117                         qLock.AcquireWriterLock (TIMEOUT);
 118                         try {
 119                                 IMessageQueue mq = new RabbitMQMessageQueue (this, qRef, transactional);
 120                                 queues[qRef] = mq;
 121                                 return mq;
 122                         } finally {
 123                                 qLock.ReleaseWriterLock ();
 124                         }
 125                 }
 126
 127                 public IMessageQueue GetMessageQueue (QueueReference qRef)
 128                 {
 129                         qLock.AcquireReaderLock (TIMEOUT);
 130                         try {
 131                                 if (queues.Contains (qRef))
 132                                         return (IMessageQueue) queues[qRef];
 133                                 else {
 134                                         LockCookie lc = qLock.UpgradeToWriterLock (TIMEOUT);
 135                                         try {
 136                                                 IMessageQueue mq = new RabbitMQMessageQueue (this, qRef, false);
 137                                                 queues[qRef] = mq;
 138                                                 return mq;
 139                                         } finally {
 140                                                 qLock.DowngradeFromWriterLock (ref lc);
 141                                         }
 142                                 }
 143                         } finally {
 144                                 qLock.ReleaseReaderLock ();
 145                         }
 146                 }
 147
 148
 149         }
 150 }