Mantis#1682. Thank you kindly, Sempuki for a patch that:

Move control of Mono.Addins from source attributes to external XML files.
This removes a lot of coupling of the source with Mono.Addins

OpenSim/ApplicationPlugins/LoadRegions/LoadRegionsPlugin.cs

@@ -28,18 +28,13 @@
 using System.Reflection;
 using System.Threading;
 using log4net;
-using Mono.Addins;
 using Nini.Config;
 using OpenSim.Framework;
 using OpenSim.Framework.RegionLoader.Filesystem;
 using OpenSim.Framework.RegionLoader.Web;
 
-[assembly : Addin]
-[assembly : AddinDependency("OpenSim", "0.5")]
-
 namespace OpenSim.ApplicationPlugins.LoadRegions
 {
-    [Extension("/OpenSim/Startup")]
     public class LoadRegionsPlugin : IApplicationPlugin
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

OpenSim/ApplicationPlugins/RemoteController/RemoteAdminPlugin.cs

@@ -33,19 +33,14 @@ using System.Reflection;
 using System.Timers;
 using libsecondlife;
 using log4net;
-using Mono.Addins;
 using Nwc.XmlRpc;
 using OpenSim.Framework;
 using OpenSim.Framework.Servers;
 using OpenSim.Region.Environment.Modules.World.Terrain;
 using OpenSim.Region.Environment.Scenes;
 
-[assembly : Addin]
-[assembly : AddinDependency("OpenSim", "0.5")]
-
 namespace OpenSim.ApplicationPlugins.RemoteController
 {
-    [Extension("/OpenSim/Startup")]
     public class RemoteAdminPlugin : IApplicationPlugin
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

OpenSim/ApplicationPlugins/Rest/Inventory/RestHandler.cs

@@ -32,16 +32,9 @@ using System.Reflection;
 using OpenSim.Framework;
 using OpenSim.Framework.Servers;
 using OpenSim.ApplicationPlugins.Rest;
-using Mono.Addins;
-
-[assembly : Addin]
-[assembly : AddinDependency("OpenSim", "0.5")]
 
 namespace OpenSim.ApplicationPlugins.Rest.Inventory
 {
-
-    [Extension("/OpenSim/Startup")]
-
     public class RestHandler : RestPlugin, IHttpAgentHandler
     {
 

OpenSim/ApplicationPlugins/Rest/Regions/GETHandler.cs

@@ -37,7 +37,6 @@ using System.Timers;
 using System.Xml;
 using System.Xml.Serialization;
 using libsecondlife;
-using Mono.Addins;
 using Nwc.XmlRpc;
 using Nini.Config;
 using OpenSim.Framework;

OpenSim/ApplicationPlugins/Rest/Regions/POSTHandler.cs

@@ -37,7 +37,6 @@ using System.Timers;
 using System.Xml;
 using System.Xml.Serialization;
 using libsecondlife;
-using Mono.Addins;
 using Nwc.XmlRpc;
 using Nini.Config;
 using OpenSim.Framework;

OpenSim/ApplicationPlugins/Rest/Regions/RestRegionPlugin.cs

@@ -37,7 +37,6 @@ using System.Timers;
 using System.Xml;
 using System.Xml.Serialization;
 using libsecondlife;
-using Mono.Addins;
 using Nwc.XmlRpc;
 using Nini.Config;
 using OpenSim.Framework;
@@ -47,13 +46,8 @@ using OpenSim.Framework.Communications;
 using OpenSim.Region.Environment.Scenes;
 using OpenSim.ApplicationPlugins.Rest;
 
-[assembly : Addin]
-[assembly : AddinDependency("OpenSim", "0.5")]
-
 namespace OpenSim.ApplicationPlugins.Rest.Regions
 {
-
-    [Extension("/OpenSim/Startup")]
     public partial class RestRegionPlugin : RestPlugin
     {
         private static XmlSerializerNamespaces _xmlNs;

OpenSim/ApplicationPlugins/Rest/RestPlugin.cs

@@ -35,7 +35,6 @@ using System.Reflection;
 using System.Timers;
 using System.Xml;
 using libsecondlife;
-using Mono.Addins;
 using Nwc.XmlRpc;
 using Nini.Config;
 using OpenSim.Framework;
@@ -44,13 +43,8 @@ using OpenSim.Framework.Servers;
 using OpenSim.Framework.Communications;
 using OpenSim.Region.Environment.Scenes;
 
-// [assembly : Addin]
-// [assembly : AddinDependency("OpenSim", "0.5")]
-
 namespace OpenSim.ApplicationPlugins.Rest
 {
-
-    // [Extension("/OpenSim/Startup")]
     public abstract class RestPlugin : IApplicationPlugin
     {
         #region properties

OpenSim/Framework/PluginLoader.cs

@@ -55,6 +55,7 @@ namespace OpenSim.Framework
     }
 
     /// <summary>
+
     /// Generic Plugin Loader
     /// </summary>
     public class PluginLoader <T> : IDisposable where T : IPlugin
@@ -67,6 +68,7 @@ namespace OpenSim.Framework
         private Dictionary<string,IPluginConstraint> constraints 
             = new Dictionary<string,IPluginConstraint>();
 
+        private static bool runonce = false; 
         private static readonly ILog log 
             = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
@@ -84,25 +86,19 @@ namespace OpenSim.Framework
         public PluginLoader () 
         {
             Initialiser = new PluginInitialiserBase();
+            initialise_plugin_dir_ (".");
         }
 
         public PluginLoader (PluginInitialiserBase init)
         {            
-           Initialiser = init;
+            Initialiser = init;
+            initialise_plugin_dir_ (".");
         }
 
         public PluginLoader (PluginInitialiserBase init, string dir)
         {            
-           Initialiser = init;
+            Initialiser = init;
-           AddPluginDir (dir);
+            initialise_plugin_dir_ (dir);
-        }
-
-        public void AddPluginDir (string dir)
-        {
-            suppress_console_output_ (true);
-            AddinManager.Initialize (dir);
-            AddinManager.Registry.Update (null);            
-            suppress_console_output_ (false);
         }
 
         public void AddExtensionPoint (string extpoint)
@@ -115,21 +111,20 @@ namespace OpenSim.Framework
             constraints.Add (extpoint, cons);
         }
 
-        public void Load (string extpoint, string dir)
+        public void Load (string extpoint)
         {
-            AddPluginDir (dir);
             AddExtensionPoint (extpoint);
             Load();
         }
 
         public void Load ()
         {            
-            suppress_console_output_ (true);
+            log.Info("[PLUGINS]: Begin Loading " + AddinManager.Registry.RegistryPath);
-            AddinManager.Registry.Update (null);            
-            suppress_console_output_ (false);
 
             foreach (string ext in extpoints)
             {
+                log.Info("[PLUGINS]: Loading extension point " + ext);
+
                 if (constraints.ContainsKey (ext))
                 {
                     IPluginConstraint cons = constraints [ext];
@@ -155,9 +150,25 @@ namespace OpenSim.Framework
                 p.Dispose ();
         }
 
-        public void ClearCache()
+        private void initialise_plugin_dir_ (string dir)
         {
-            // The Mono addin manager (in Mono.Addins.dll version 0.2.0.0) occasionally seems to corrupt its addin cache
+            if (runonce == true)
+                return;
+
+            log.Info("[PLUGINS]: Initialzing " + dir);
+
+            clear_registry_();
+            suppress_console_output_ (true);
+            AddinManager.Initialize (dir);
+            AddinManager.Registry.Update (null);
+            suppress_console_output_ (false);
+            runonce = true;
+        }
+
+        private void clear_registry_ ()
+        {
+            // The Mono addin manager (in Mono.Addins.dll version 0.2.0.0) 
+            // occasionally seems to corrupt its addin cache
             // Hence, as a temporary solution we'll remove it before each startup
             if (Directory.Exists("addin-db-000"))
                 Directory.Delete("addin-db-000", true);

OpenSim/Grid/GridServer/GridServerBase.cs

@@ -31,7 +31,6 @@ using System.IO;
 using System.Reflection;
 using System.Timers;
 using log4net;
-using Mono.Addins;
 using OpenSim.Framework;
 using OpenSim.Framework.Console;
 using OpenSim.Framework.Servers;
@@ -121,7 +120,7 @@ namespace OpenSim.Grid.GridServer
             PluginLoader<IGridPlugin> loader = 
                 new PluginLoader<IGridPlugin> (new GridPluginInitialiser (this));
 
-            loader.Load ("/OpenSim/GridServer", ".");
+            loader.Load ("/OpenSim/GridServer");
             m_plugins = loader.Plugins;
         }
 

OpenSim/Grid/GridServer/IGridPlugin.cs

@@ -26,14 +26,10 @@
 *
 */
 
-using Mono.Addins;
 using OpenSim.Framework;
 
-[assembly : AddinRoot("OpenSim", "0.5")]
-
 namespace OpenSim.Grid.GridServer
 {
-    [TypeExtensionPoint("/OpenSim/GridServer")]
     public interface IGridPlugin : IPlugin
     {
         void Initialise(GridServerBase gridServer);

OpenSim/Region/Application/IApplicationPlugin.cs

@@ -25,14 +25,10 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-using Mono.Addins;
 using OpenSim.Framework;
 
-[assembly : AddinRoot("OpenSim", "0.5")]
-
 namespace OpenSim
 {
-    [TypeExtensionPoint("/OpenSim/Startup")]
     public interface IApplicationPlugin : IPlugin
     {
         void Initialise(OpenSimBase openSim);

OpenSim/Region/Application/OpenSimBase.cs

@@ -34,7 +34,6 @@ using System.Text;
 using System.Threading;
 using libsecondlife;
 using log4net;
-using Mono.Addins;
 using Nini.Config;
 using OpenSim.Framework;
 using OpenSim.Framework.Communications.Cache;
@@ -337,7 +336,7 @@ namespace OpenSim
             PluginLoader<IApplicationPlugin> loader = 
                 new PluginLoader<IApplicationPlugin> (new ApplicationPluginInitialiser (this));
 
-            loader.Load ("/OpenSim/Startup", ".");
+            loader.Load ("/OpenSim/Startup");
             m_plugins = loader.Plugins;
         }
 
@@ -730,3 +729,4 @@ namespace OpenSim
 
 
 
+

bin/addins/LoadRegionsPlugin.addin.xml

@@ -0,0 +1,11 @@
+<Addin>
+    <Runtime>
+        <Import assembly="../OpenSim.ApplicationPlugins.LoadRegions.dll"/>
+    </Runtime>
+    <Dependencies>
+        <Addin id="OpenSim" version="0.5" />
+    </Dependencies>
+    <Extension path = "/OpenSim/Startup">
+        <Type type="OpenSim.ApplicationPlugins.LoadRegions.LoadRegionsPlugin" />
+    </Extension>
+</Addin>

bin/addins/OpenSim.Grid.GridServer.host.addins

@@ -0,0 +1,3 @@
+<Addins host-reference="/home/ryanm/Code/opensim/bin/OpenSim.Grid.GridServer.exe">
+  <Directory>/home/ryanm/Code/opensim/bin</Directory>
+</Addins>

bin/addins/OpenSim.Grid.Gridserver.addin.xml

@@ -0,0 +1,8 @@
+<Addin id="OpenSim" version="0.5" isroot="true">
+    <Runtime>
+        <Import assembly="../OpenSim.Grid.GridServer.exe"/>
+    </Runtime>
+    <ExtensionPoint path = "/OpenSim/GridServer">
+        <ExtensionNode objectType="IGridPlugin"/>
+    </ExtensionPoint>
+</Addin>

bin/addins/OpenSim.addin.xml

@@ -0,0 +1,8 @@
+<Addin id="OpenSim" version="0.5" isroot="true">
+    <Runtime>
+        <Import assembly="../OpenSim.exe"/>
+    </Runtime>
+    <ExtensionPoint path = "/OpenSim/Startup">
+        <ExtensionNode objectType="IApplicationPlugin"/>
+    </ExtensionPoint>
+</Addin>

bin/addins/OpenSim.host.addins

@@ -0,0 +1,6 @@
+<Addins host-reference="/home/ryanm/Code/opensim/bin/OpenSim.exe">
+  <Directory>/home/ryanm/Code/opensim/bin</Directory>
+</Addins>
+<Addins host-reference="C:\cfk2007\svnsugi\bin\OpenSim.exe">
+  <Directory>C:\cfk2007\svnsugi\bin</Directory>
+</Addins>

bin/addins/RemoteAdminPlugin.addin.xml

@@ -0,0 +1,11 @@
+<Addin>
+    <Runtime>
+        <Import assembly="../OpenSim.ApplicationPlugins.RemoteController.dll"/>
+    </Runtime>
+    <Dependencies>
+        <Addin id="OpenSim" version="0.5" />
+    </Dependencies>
+    <Extension path = "/OpenSim/Startup">
+        <Type type="OpenSim.ApplicationPlugins.RemoteController.RemoteAdminPlugin" />
+    </Extension>
+</Addin>

bin/addins/RemoteAdminPlugin.xml

@@ -0,0 +1,11 @@
+<Addin>
+    <Runtime>
+        <Import assembly="../OpenSim.ApplicationPlugins.RemoteController.dll"/>
+    </Runtime>
+    <Dependencies>
+        <Addin id="OpenSim" version="0.5" />
+    </Dependencies>
+    <Extension path = "/OpenSim/Startup">
+        <Type type="OpenSim.ApplicationPlugins.RemoteController.RemoteAdminPlugin" />
+    </Extension>
+</Addin>

bin/addins/RestHandler.addin.xml

@@ -0,0 +1,11 @@
+<Addin>
+    <Runtime>
+        <Import assembly="../OpenSim.ApplicationPlugins.Rest.Inventory.dll"/>
+    </Runtime>
+    <Dependencies>
+        <Addin id="OpenSim" version="0.5" />
+    </Dependencies>
+    <Extension path = "/OpenSim/Startup">
+        <Type type="OpenSim.ApplicationPlugins.Rest.Inventory.RestHandler" />
+    </Extension>
+</Addin>

bin/addins/RestRegionPlugin.addin.xml

@@ -0,0 +1,11 @@
+<Addin>
+    <Runtime>
+        <Import assembly="../OpenSim.ApplicationPlugins.Rest.Regions.dll"/>
+    </Runtime>
+    <Dependencies>
+        <Addin id="OpenSim" version="0.5" />
+    </Dependencies>
+    <Extension path = "/OpenSim/Startup">
+        <Type type="OpenSim.ApplicationPlugins.Rest.Regions.RestRegionPlugin" />
+    </Extension>
+</Addin>