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;
50 private MessagingProviderLocator () {
51 string providerName = System.Environment.GetEnvironmentVariable("MONO_MESSAGING_PROVIDER");
52 if (providerName == null || providerName == "")
53 throw new Exception("Environment Variable MONO_MESSAGING_PROVIDER not defined");
54 provider = CreateProvider (providerName);
57 public static MessagingProviderLocator Instance {
58 get { return instance; }
61 public static IMessagingProvider GetProvider ()
63 return Instance.provider;
66 private IMessagingProvider CreateProvider (string className)
68 Type t = Type.GetType (className);
70 throw new Exception ("Can't find class: " + className);
72 ConstructorInfo ci = t.GetConstructor (BindingFlags.Public | BindingFlags.Instance,
75 new ParameterModifier[0]);
77 throw new Exception ("Can't find constructor");
79 return (IMessagingProvider) ci.Invoke (new object[0]);