class/Mono.Messaging.RabbitMQ/Mono.Messaging.RabbitMQ/RabbitMQMessageQueueTransaction.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.ComponentModel;
  34 using System.IO;
  35 using System.Text;
  36
  37 using Mono.Messaging;
  38
  39 using RabbitMQ.Client;
  40 using RabbitMQ.Client.Content;
  41 using RabbitMQ.Client.Events;
  42 using RabbitMQ.Client.Exceptions;
  43 using RabbitMQ.Client.MessagePatterns;
  44 using RabbitMQ.Util;
  45
  46 namespace Mono.Messaging.RabbitMQ {
  47
  48         public class RabbitMQMessageQueueTransaction : IMessageQueueTransaction {
  49
  50                 private readonly string txId;
  51                 private MessageQueueTransactionStatus status = MessageQueueTransactionStatus.Initialized;
  52                 private IConnection cn = null;
  53                 private IModel model = null;
  54                 private String host = null;
  55                 private bool isDisposed = false;
  56                 private Object syncObj = new Object ();
  57
  58                 public RabbitMQMessageQueueTransaction (string txId)
  59                 {
  60                         this.txId = txId;
  61                 }
  62
  63                 public MessageQueueTransactionStatus Status {
  64                         get {
  65                                 lock (syncObj)
  66                                         return status;
  67                         }
  68                 }
  69
  70                 public void Abort ()
  71                 {
  72                         lock (syncObj) {
  73                                 if (model != null)
  74                                         model.TxRollback ();
  75                                 status = MessageQueueTransactionStatus.Aborted;
  76                         }
  77                 }
  78
  79                 public void Begin ()
  80                 {
  81                         lock (syncObj) {
  82                                 if (status == MessageQueueTransactionStatus.Pending)
  83                                         throw new InvalidOperationException ("Transaction already started");
  84                                 status = MessageQueueTransactionStatus.Pending;
  85                         }
  86                 }
  87
  88                 public void Commit ()
  89                 {
  90                         lock (syncObj) {
  91                                 model.TxCommit ();
  92                                 status = MessageQueueTransactionStatus.Committed;
  93                         }
  94                 }
  95
  96                 public string Id {
  97                         get { return txId; }
  98                 }
  99
 100                 public delegate void Send (ref string host, ref IConnection cn,
 101                                            ref IModel model, IMessage msg, string txId);
 102
 103                 public delegate IMessage Receive (ref string host, ref IConnection cn,
 104                                                   ref IModel model, string txId);
 105
 106                 public void RunSend (Send sendDelegate, IMessage msg)
 107                 {
 108                         lock (syncObj) {
 109                                 sendDelegate (ref host, ref cn, ref model, msg, Id);
 110                         }
 111                 }
 112
 113                 public IMessage RunReceive (Receive receiveDelegate)
 114                 {
 115                         lock (syncObj) {
 116                                 return receiveDelegate (ref host, ref cn, ref model, Id);
 117                         }
 118                 }
 119
 120                 public void Dispose ()
 121                 {
 122                         Dispose (true);
 123                         GC.SuppressFinalize (this);
 124                 }
 125
 126                 protected virtual void Dispose (bool disposing)
 127                 {
 128                         lock (syncObj) {
 129                                 if (!isDisposed && disposing) {
 130                                         if (model != null)
 131                                                 model.Dispose ();
 132                                         if (cn != null)
 133                                                 cn.Dispose ();
 134                                         isDisposed = true;
 135                                 }
 136                         }
 137                 }
 138
 139         }
 140 }