5 // Michael Barker (mike@middlesoft.co.uk)
7 // (C) Ximian, Inc. http://www.ximian.com
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:(
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
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.
31 using System.Reflection;
32 using System.Collections;
34 namespace Mono.Messaging
37 /// The main entry point for System.Messaging to get a handle on the
38 /// messaging implementation. It will maintain a single instance of the
39 /// IMessagingProvider (i.e. a singleton) that will be shared between
40 /// threads, therefore any implementation of the IMessagingProvider must
43 public class MessagingProviderLocator
45 public static readonly TimeSpan InfiniteTimeout = TimeSpan.MaxValue;
46 private static readonly MessagingProviderLocator instance = new MessagingProviderLocator();
47 private readonly IMessagingProvider provider;
48 private const string MESSAGING_PROVIDER_KEY = "MONO_MESSAGING_PROVIDER";
49 private const string RABBIT_MQ_CLASS_NAME = "Mono.Messaging.RabbitMQ.RabbitMQMessagingProvider";
50 private const string RABBIT_MQ_FULL_CLASS_NAME = RABBIT_MQ_CLASS_NAME + ",Mono.Messaging.RabbitMQ";
51 private const string RABBIT_MQ_ALIAS = "rabbitmq";
53 private MessagingProviderLocator () {
54 string providerName = GetProviderClassName ();
55 if (providerName == null || providerName == "")
56 providerName = RABBIT_MQ_ALIAS;
57 provider = CreateProvider (providerName);
60 public static MessagingProviderLocator Instance {
61 get { return instance; }
64 public static IMessagingProvider GetProvider ()
66 return Instance.provider;
69 private string GetProviderClassName ()
71 return System.Configuration.ConfigurationManager.AppSettings[MESSAGING_PROVIDER_KEY];
74 private IMessagingProvider CreateProvider (string className)
76 Type t = ResolveType (className);
78 throw new MonoMessagingException ("Can't find class: " + className);
80 ConstructorInfo ci = t.GetConstructor (BindingFlags.Public | BindingFlags.Instance,
83 new ParameterModifier[0]);
85 throw new MonoMessagingException ("Can't find constructor for: " + className);
87 return (IMessagingProvider) ci.Invoke (new object[0]);
90 private Type ResolveType (string classNameOrAlias)
92 switch (classNameOrAlias) {
94 case RABBIT_MQ_FULL_CLASS_NAME:
95 Assembly a = Assembly.Load (Consts.AssemblyMono_Messaging_RabbitMQ);
96 return a.GetType (RABBIT_MQ_CLASS_NAME);
98 throw new MonoMessagingException ("Unknown MessagingProvider class name or alias: " + classNameOrAlias);