Thanks, sempuki, for a patch that moves all Grid Server's plugins to

PluginLoader. Fix issue 1871.

8 files changed, 174 insertions, 182 deletions

diff --git a/OpenSim/Framework/Communications/Cache/AssetServerBase.cs b/OpenSim/Framework/Communications/Cache/AssetServerBase.cs
index f729d78..ed5b896 100644
--- a/OpenSim/Framework/Communications/Cache/AssetServerBase.cs
+++ b/OpenSim/Framework/Communications/Cache/AssetServerBase.cs
@@ -43,7 +43,7 @@ namespace OpenSim.Framework.Communications.Cache
         protected IAssetReceiver m_receiver;
         protected BlockingQueue<AssetRequest> m_assetRequests;
         protected Thread m_localAssetServerThread;
-        protected IAssetProvider m_assetProvider;
+        protected IAssetProviderPlugin m_assetProvider;
 
         // Temporarily hardcoded - should be a plugin
         protected IAssetLoader assetLoader = new AssetLoaderFileSystem();
diff --git a/OpenSim/Framework/Communications/Cache/SQLAssetServer.cs b/OpenSim/Framework/Communications/Cache/SQLAssetServer.cs
index 94a8509..2f72e11 100644
--- a/OpenSim/Framework/Communications/Cache/SQLAssetServer.cs
+++ b/OpenSim/Framework/Communications/Cache/SQLAssetServer.cs
@@ -40,7 +40,7 @@ namespace OpenSim.Framework.Communications.Cache
             AddPlugin(pluginName, connect);
         }
 
-        public SQLAssetServer(IAssetProvider assetProvider)
+        public SQLAssetServer(IAssetProviderPlugin assetProvider)
         {
             m_assetProvider = assetProvider;
         }
@@ -54,12 +54,12 @@ namespace OpenSim.Framework.Communications.Cache
             {
                 if (!pluginType.IsAbstract)
                 {
-                    Type typeInterface = pluginType.GetInterface("IAssetProvider", true);
+                    Type typeInterface = pluginType.GetInterface("IAssetProviderPlugin", true);
 
                     if (typeInterface != null)
                     {
-                        IAssetProvider plug =
-                            (IAssetProvider) Activator.CreateInstance(pluginAssembly.GetType(pluginType.ToString()));
+                        IAssetProviderPlugin plug =
+                            (IAssetProviderPlugin) Activator.CreateInstance(pluginAssembly.GetType(pluginType.ToString()));
                         m_assetProvider = plug;
                         m_assetProvider.Initialise(connect);
 
diff --git a/OpenSim/Framework/Communications/InventoryServiceBase.cs b/OpenSim/Framework/Communications/InventoryServiceBase.cs
index 06b707b..40701f0 100644
--- a/OpenSim/Framework/Communications/InventoryServiceBase.cs
+++ b/OpenSim/Framework/Communications/InventoryServiceBase.cs
@@ -43,38 +43,25 @@ namespace OpenSim.Framework.Communications
         private static readonly ILog m_log
             = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
-        protected Dictionary<string, IInventoryData> m_plugins = new Dictionary<string, IInventoryData>();
+        protected List<IInventoryDataPlugin> m_plugins = new List<IInventoryDataPlugin>();
 
         #region Plugin methods
 
         /// <summary>
         /// Adds a new user server plugin - plugins will be requested in the order they were loaded.
         /// </summary>
-        /// <param name="FileName">The filename to the user server plugin DLL</param>
-        public void AddPlugin(string FileName, string connect)
+        /// <param name="provider">The filename to the user server plugin DLL</param>
+        public void AddPlugin(string provider, string connect)
         {
-            if (!String.IsNullOrEmpty(FileName))
-            {
-                m_log.Info("[AGENT INVENTORY]: Inventory storage: Attempting to load " + FileName);
-                Assembly pluginAssembly = Assembly.LoadFrom(FileName);
-
-                foreach (Type pluginType in pluginAssembly.GetTypes())
-                {
-                    if (!pluginType.IsAbstract)
-                    {
-                        Type typeInterface = pluginType.GetInterface("IInventoryData", true);
-
-                        if (typeInterface != null)
-                        {
-                            IInventoryData plug =
-                                (IInventoryData) Activator.CreateInstance(pluginAssembly.GetType(pluginType.ToString()));
-                            plug.Initialise(connect);
-                            m_plugins.Add(plug.getName(), plug);
-                            m_log.Info("[AGENTINVENTORY]: Added IInventoryData Interface");
-                        }
-                    }
-                }
-            }
+            PluginLoader<IInventoryDataPlugin> loader = 
+                new PluginLoader<IInventoryDataPlugin> (new InventoryDataInitialiser (connect));
+
+            // loader will try to load all providers (MySQL, MSSQL, etc) 
+            // unless it is constrainted to the correct "Provider" entry in the addin.xml
+            loader.Add ("/OpenSim/InventoryData", new PluginProviderFilter (provider));
+            loader.Load();
+            
+            m_plugins = loader.Plugins;
         }
 
         #endregion
@@ -103,9 +90,9 @@ namespace OpenSim.Framework.Communications
 
             userFolders.Add(rootFolder);
 
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                IList<InventoryFolderBase> folders = plugin.Value.getFolderHierarchy(rootFolder.ID);
+                IList<InventoryFolderBase> folders = plugin.getFolderHierarchy(rootFolder.ID);
                 userFolders.AddRange(folders);
             }
 
@@ -127,9 +114,9 @@ namespace OpenSim.Framework.Communications
         public InventoryFolderBase RequestRootFolder(LLUUID userID)
         {
             // FIXME: Probably doesn't do what was originally intended - only ever queries the first plugin
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                return plugin.Value.getUserRootFolder(userID);
+                return plugin.getUserRootFolder(userID);
             }
             return null;
         }
@@ -168,9 +155,9 @@ namespace OpenSim.Framework.Communications
         public List<InventoryFolderBase> RequestSubFolders(LLUUID parentFolderID)
         {
             List<InventoryFolderBase> inventoryList = new List<InventoryFolderBase>();
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                return plugin.Value.getInventoryFolders(parentFolderID);
+                return plugin.getInventoryFolders(parentFolderID);
             }
             return inventoryList;
         }
@@ -178,9 +165,9 @@ namespace OpenSim.Framework.Communications
         public List<InventoryItemBase> RequestFolderItems(LLUUID folderID)
         {
             List<InventoryItemBase> itemsList = new List<InventoryItemBase>();
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                itemsList = plugin.Value.getInventoryInFolder(folderID);
+                itemsList = plugin.getInventoryInFolder(folderID);
                 return itemsList;
             }
             return itemsList;
@@ -194,9 +181,9 @@ namespace OpenSim.Framework.Communications
             m_log.DebugFormat(
                 "[AGENT INVENTORY]: Adding folder {0} {1} to folder {2}", folder.Name, folder.ID, folder.ParentID);
 
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                plugin.Value.addInventoryFolder(folder);
+                plugin.addInventoryFolder(folder);
             }
 
             // FIXME: Should return false on failure
@@ -209,9 +196,9 @@ namespace OpenSim.Framework.Communications
             m_log.DebugFormat(
                 "[AGENT INVENTORY]: Updating folder {0} {1} to folder {2}", folder.Name, folder.ID, folder.ParentID);
 
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                plugin.Value.updateInventoryFolder(folder);
+                plugin.updateInventoryFolder(folder);
             }
 
             // FIXME: Should return false on failure
@@ -224,9 +211,9 @@ namespace OpenSim.Framework.Communications
             m_log.DebugFormat(
                 "[AGENT INVENTORY]: Moving folder {0} {1} to folder {2}", folder.Name, folder.ID, folder.ParentID);
 
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                plugin.Value.moveInventoryFolder(folder);
+                plugin.moveInventoryFolder(folder);
             }
 
             // FIXME: Should return false on failure
@@ -239,9 +226,9 @@ namespace OpenSim.Framework.Communications
             m_log.DebugFormat(
                 "[AGENT INVENTORY]: Adding item {0} {1} to folder {2}", item.Name, item.ID, item.Folder);
 
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                plugin.Value.addInventoryItem(item);
+                plugin.addInventoryItem(item);
             }
 
             // FIXME: Should return false on failure
@@ -254,9 +241,9 @@ namespace OpenSim.Framework.Communications
             m_log.InfoFormat(
                 "[AGENT INVENTORY]: Updating item {0} {1} in folder {2}", item.Name, item.ID, item.Folder);
 
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                plugin.Value.updateInventoryItem(item);
+                plugin.updateInventoryItem(item);
             }
 
             // FIXME: Should return false on failure
@@ -269,9 +256,9 @@ namespace OpenSim.Framework.Communications
             m_log.InfoFormat(
                 "[AGENT INVENTORY]: Deleting item {0} {1} from folder {2}", item.Name, item.ID, item.Folder);
 
-            foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+            foreach (IInventoryDataPlugin plugin in m_plugins)
             {
-                plugin.Value.deleteInventoryItem(item.ID);
+                plugin.deleteInventoryItem(item.ID);
             }
 
             // FIXME: Should return false on failure
@@ -296,9 +283,9 @@ namespace OpenSim.Framework.Communications
             {
 //                m_log.DebugFormat("[AGENT INVENTORY]: Deleting folder {0} {1}", subFolder.Name, subFolder.ID);
 
-                foreach (KeyValuePair<string, IInventoryData> plugin in m_plugins)
+                foreach (IInventoryDataPlugin plugin in m_plugins)
                 {
-                    plugin.Value.deleteInventoryFolder(subFolder.ID);
+                    plugin.deleteInventoryFolder(subFolder.ID);
                 }
             }
 
diff --git a/OpenSim/Framework/Communications/UserManagerBase.cs b/OpenSim/Framework/Communications/UserManagerBase.cs
index 1b73152..f8e77df 100644
--- a/OpenSim/Framework/Communications/UserManagerBase.cs
+++ b/OpenSim/Framework/Communications/UserManagerBase.cs
@@ -47,42 +47,23 @@ namespace OpenSim.Framework.Communications
             = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
         public UserConfig _config;
-        private Dictionary<string, IUserData> _plugins = new Dictionary<string, IUserData>();
+        private List<IUserData> _plugins = new List<IUserData>();
 
         /// <summary>
         /// Adds a new user server plugin - user servers will be requested in the order they were loaded.
         /// </summary>
-        /// <param name="FileName">The filename to the user server plugin DLL</param>
-        public void AddPlugin(string FileName, string connect)
+        /// <param name="provider">The filename to the user server plugin DLL</param>
+        public void AddPlugin(string provider, string connect)
         {
-            if (!String.IsNullOrEmpty(FileName))
-            {
-                m_log.Info("[USERSTORAGE]: Attempting to load " + FileName);
-                Assembly pluginAssembly = Assembly.LoadFrom(FileName);
-
-                m_log.Info("[USERSTORAGE]: Found " + pluginAssembly.GetTypes().Length + " interfaces.");
-                foreach (Type pluginType in pluginAssembly.GetTypes())
-                {
-                    if (!pluginType.IsAbstract)
-                    {
-                        Type typeInterface = pluginType.GetInterface("IUserData", true);
-
-                        if (typeInterface != null)
-                        {
-                            IUserData plug =
-                                (IUserData) Activator.CreateInstance(pluginAssembly.GetType(pluginType.ToString()));
-                            AddPlugin(plug, connect);
-                        }
-                    }
-                }
-            }
-        }
-
-        public void AddPlugin(IUserData plug, string connect)
-        {
-            plug.Initialise(connect);
-            _plugins.Add(plug.Name, plug);
-            m_log.Info("[USERSTORAGE]: Added IUserData Interface");
+            PluginLoader<IUserData> loader = 
+                new PluginLoader<IUserData> (new UserDataInitialiser (connect));
+
+            // loader will try to load all providers (MySQL, MSSQL, etc) 
+            // unless it is constrainted to the correct "Provider" entry in the addin.xml
+            loader.Add ("/OpenSim/UserData", new PluginProviderFilter (provider));
+            loader.Load();
+            
+            _plugins = loader.Plugins;
         }
 
         #region Get UserProfile
@@ -90,9 +71,9 @@ namespace OpenSim.Framework.Communications
         // see IUserService
         public UserProfileData GetUserProfile(string fname, string lname)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
-                UserProfileData profile = plugin.Value.GetUserByName(fname, lname);
+                UserProfileData profile = plugin.GetUserByName(fname, lname);
 
                 if (profile != null)
                 {
@@ -105,9 +86,9 @@ namespace OpenSim.Framework.Communications
         }
         public UserAgentData GetAgentByUUID(LLUUID userId)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
-                UserAgentData agent = plugin.Value.GetAgentByUUID(userId);
+                UserAgentData agent = plugin.GetAgentByUUID(userId);
 
                 if (agent != null)
                 {
@@ -120,9 +101,9 @@ namespace OpenSim.Framework.Communications
         // see IUserService
         public UserProfileData GetUserProfile(LLUUID uuid)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
-                UserProfileData profile = plugin.Value.GetUserByUUID(uuid);
+                UserProfileData profile = plugin.GetUserByUUID(uuid);
 
                 if (null != profile)
                 {
@@ -137,15 +118,15 @@ namespace OpenSim.Framework.Communications
         public List<AvatarPickerAvatar> GenerateAgentPickerRequestResponse(LLUUID queryID, string query)
         {
             List<AvatarPickerAvatar> pickerlist = new List<AvatarPickerAvatar>();
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    pickerlist = plugin.Value.GeneratePickerResults(queryID, query);
+                    pickerlist = plugin.GeneratePickerResults(queryID, query);
                 }
                 catch (Exception)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to generate AgentPickerData via  " + plugin.Key + "(" + query + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to generate AgentPickerData via  " + plugin.Name + "(" + query + ")");
                     return new List<AvatarPickerAvatar>();
                 }
             }
@@ -159,17 +140,17 @@ namespace OpenSim.Framework.Communications
         /// <returns></returns>
         public bool UpdateUserProfile(UserProfileData data)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.UpdateUserProfile(data);
+                    plugin.UpdateUserProfile(data);
                     return true;
                 }
                 catch (Exception e)
                 {
                     m_log.InfoFormat("[USERSTORAGE]: Unable to set user {0} {1} via {2}: {3}", data.FirstName, data.SurName,
-                                     plugin.Key, e.ToString());
+                                     plugin.Name, e.ToString());
                 }
             }
             return false;
@@ -186,15 +167,15 @@ namespace OpenSim.Framework.Communications
         /// <returns>Agent profiles</returns>
         public UserAgentData GetUserAgent(LLUUID uuid)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    return plugin.Value.GetAgentByUUID(uuid);
+                    return plugin.GetAgentByUUID(uuid);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to find user via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to find user via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
 
@@ -208,15 +189,15 @@ namespace OpenSim.Framework.Communications
         /// <returns>A user agent</returns>
         public UserAgentData GetUserAgent(string name)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    return plugin.Value.GetAgentByName(name);
+                    return plugin.GetAgentByName(name);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to find user via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to find user via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
 
@@ -231,15 +212,15 @@ namespace OpenSim.Framework.Communications
         /// <returns>A user agent</returns>
         public UserAgentData GetUserAgent(string fname, string lname)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    return plugin.Value.GetAgentByName(fname, lname);
+                    return plugin.GetAgentByName(fname, lname);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to find user via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to find user via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
 
@@ -248,15 +229,15 @@ namespace OpenSim.Framework.Communications
 
         public void UpdateUserCurrentRegion(LLUUID avatarid, LLUUID regionuuid, ulong regionhandle)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.UpdateUserCurrentRegion(avatarid, regionuuid, regionhandle);
+                    plugin.UpdateUserCurrentRegion(avatarid, regionuuid, regionhandle);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to updateuser location via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to updateuser location via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
         }
@@ -268,15 +249,15 @@ namespace OpenSim.Framework.Communications
         /// <returns>A List of FriendListItems that contains info about the user's friends</returns>
         public List<FriendListItem> GetUserFriendList(LLUUID ownerID)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    return plugin.Value.GetUserFriendList(ownerID);
+                    return plugin.GetUserFriendList(ownerID);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to GetUserFriendList via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to GetUserFriendList via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
 
@@ -285,60 +266,60 @@ namespace OpenSim.Framework.Communications
 
         public void StoreWebLoginKey(LLUUID agentID, LLUUID webLoginKey)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.StoreWebLoginKey(agentID, webLoginKey);
+                    plugin.StoreWebLoginKey(agentID, webLoginKey);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to Store WebLoginKey via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to Store WebLoginKey via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
         }
 
         public void AddNewUserFriend(LLUUID friendlistowner, LLUUID friend, uint perms)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.AddNewUserFriend(friendlistowner,friend,perms);
+                    plugin.AddNewUserFriend(friendlistowner,friend,perms);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to AddNewUserFriend via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to AddNewUserFriend via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
         }
 
         public void RemoveUserFriend(LLUUID friendlistowner, LLUUID friend)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.RemoveUserFriend(friendlistowner, friend);
+                    plugin.RemoveUserFriend(friendlistowner, friend);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to RemoveUserFriend via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to RemoveUserFriend via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
         }
 
         public void UpdateUserFriendPerms(LLUUID friendlistowner, LLUUID friend, uint perms)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.UpdateUserFriendPerms(friendlistowner, friend, perms);
+                    plugin.UpdateUserFriendPerms(friendlistowner, friend, perms);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to UpdateUserFriendPerms via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to UpdateUserFriendPerms via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
         }
@@ -564,15 +545,15 @@ namespace OpenSim.Framework.Communications
             user.HomeRegionX = regX;
             user.HomeRegionY = regY;
 
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.AddNewUserProfile(user);
+                    plugin.AddNewUserProfile(user);
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to add user via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to add user via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
 
@@ -586,16 +567,16 @@ namespace OpenSim.Framework.Communications
                 m_log.Info("[USERSTORAGE]: Failed to find User by UUID " + UserProfile.ID.ToString());
                 return false;
             }
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.UpdateUserProfile(UserProfile);
+                    plugin.UpdateUserProfile(UserProfile);
                 }
                 catch (Exception e)
                 {
                     m_log.Info("[USERSTORAGE]: Unable to update user " + UserProfile.ID.ToString()
-                               + " via " + plugin.Key + "(" + e.ToString() + ")");
+                               + " via " + plugin.Name + "(" + e.ToString() + ")");
                     return false;
                 }
             }
@@ -612,16 +593,16 @@ namespace OpenSim.Framework.Communications
         /// <param name="agentdata">The agent data to be added</param>
         public bool AddUserAgent(UserAgentData agentdata)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.AddNewUserAgent(agentdata);
+                    plugin.AddNewUserAgent(agentdata);
                     return true;
                 }
                 catch (Exception e)
                 {
-                    m_log.Info("[USERSTORAGE]: Unable to add agent via " + plugin.Key + "(" + e.ToString() + ")");
+                    m_log.Info("[USERSTORAGE]: Unable to add agent via " + plugin.Name + "(" + e.ToString() + ")");
                 }
             }
             return false;
@@ -631,15 +612,15 @@ namespace OpenSim.Framework.Communications
         /// TODO: stubs for now to get us to a compiling state gently
         public AvatarAppearance GetUserAppearance(LLUUID user)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    return plugin.Value.GetUserAppearance(user);
+                    return plugin.GetUserAppearance(user);
                 }
                 catch (Exception e)
                 {
-                    m_log.InfoFormat("[USERSTORAGE]: Unable to find user appearance {0} via {1} ({2})", user.ToString(), plugin.Key, e.ToString());
+                    m_log.InfoFormat("[USERSTORAGE]: Unable to find user appearance {0} via {1} ({2})", user.ToString(), plugin.Name, e.ToString());
                 }
             }
             return null;
@@ -647,60 +628,60 @@ namespace OpenSim.Framework.Communications
 
         public void UpdateUserAppearance(LLUUID user, AvatarAppearance appearance)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.UpdateUserAppearance(user, appearance);
+                    plugin.UpdateUserAppearance(user, appearance);
                 }
                 catch (Exception e)
                 {
-                    m_log.InfoFormat("[USERSTORAGE]: Unable to update user appearance {0} via {1} ({2})", user.ToString(), plugin.Key, e.ToString());
+                    m_log.InfoFormat("[USERSTORAGE]: Unable to update user appearance {0} via {1} ({2})", user.ToString(), plugin.Name, e.ToString());
                 }
             }
         }
 
         public void AddAttachment(LLUUID user, LLUUID item)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.AddAttachment(user, item);
+                    plugin.AddAttachment(user, item);
                 }
                 catch (Exception e)
                 {
-                    m_log.InfoFormat("[USERSTORAGE]: Unable to attach {3} => {0} via {1} ({2})", user.ToString(), plugin.Key, e.ToString(), item.ToString());
+                    m_log.InfoFormat("[USERSTORAGE]: Unable to attach {3} => {0} via {1} ({2})", user.ToString(), plugin.Name, e.ToString(), item.ToString());
                 }
             }
         }
 
         public void RemoveAttachment(LLUUID user, LLUUID item)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    plugin.Value.RemoveAttachment(user, item);
+                    plugin.RemoveAttachment(user, item);
                 }
                 catch (Exception e)
                 {
-                    m_log.InfoFormat("[USERSTORAGE]: Unable to remove attachment {3} => {0} via {1} ({2})", user.ToString(), plugin.Key, e.ToString(), item.ToString());
+                    m_log.InfoFormat("[USERSTORAGE]: Unable to remove attachment {3} => {0} via {1} ({2})", user.ToString(), plugin.Name, e.ToString(), item.ToString());
                 }
             }
         }
 
         public List<LLUUID> GetAttachments(LLUUID user)
         {
-            foreach (KeyValuePair<string, IUserData> plugin in _plugins)
+            foreach (IUserData plugin in _plugins)
             {
                 try
                 {
-                    return plugin.Value.GetAttachments(user);
+                    return plugin.GetAttachments(user);
                 }
                 catch (Exception e)
                 {
-                    m_log.InfoFormat("[USERSTORAGE]: Unable to get attachments for {0} via {1} ({2})", user.ToString(), plugin.Key, e.ToString());
+                    m_log.InfoFormat("[USERSTORAGE]: Unable to get attachments for {0} via {1} ({2})", user.ToString(), plugin.Name, e.ToString());
                 }
             }
             return new List<LLUUID>();
diff --git a/OpenSim/Framework/IAssetProvider.cs b/OpenSim/Framework/IAssetProvider.cs
index a9d0e33..00d290e 100644
--- a/OpenSim/Framework/IAssetProvider.cs
+++ b/OpenSim/Framework/IAssetProvider.cs
@@ -29,7 +29,7 @@ using libsecondlife;
 
 namespace OpenSim.Framework
 {
-    public interface IAssetProvider : IPlugin
+    public interface IAssetProviderPlugin : IPlugin
     {
         AssetBase FetchAsset(LLUUID uuid);
         void CreateAsset(AssetBase asset);
@@ -37,4 +37,15 @@ namespace OpenSim.Framework
         bool ExistsAsset(LLUUID uuid);
         void Initialise(string connect);
     }
+    
+    public class AssetDataInitialiser : PluginInitialiserBase
+    {
+        private string connect;
+        public AssetDataInitialiser (string s) { connect = s; }
+        public override void Initialise (IPlugin plugin)
+        {
+            IAssetProviderPlugin p = plugin as IAssetProviderPlugin;
+            p.Initialise (connect);
+        }
+    }
 }
diff --git a/OpenSim/Framework/IInventoryData.cs b/OpenSim/Framework/IInventoryData.cs
index fabcbe2..0d4c555 100644
--- a/OpenSim/Framework/IInventoryData.cs
+++ b/OpenSim/Framework/IInventoryData.cs
@@ -33,7 +33,7 @@ namespace OpenSim.Framework
     /// <summary>
     /// An interface for accessing inventory data from a storage server
     /// </summary>
-    public interface IInventoryData
+    public interface IInventoryDataPlugin : IPlugin
     {
         /// <summary>
         /// Initialises the interface
@@ -41,23 +41,6 @@ namespace OpenSim.Framework
         void Initialise(string connect);
 
         /// <summary>
-        /// Closes the interface
-        /// </summary>
-        void Close();
-
-        /// <summary>
-        /// The plugin being loaded
-        /// </summary>
-        /// <returns>A string containing the plugin name</returns>
-        string getName();
-
-        /// <summary>
-        /// The plugins version
-        /// </summary>
-        /// <returns>A string containing the plugin version</returns>
-        string getVersion();
-
-        /// <summary>
         /// Returns all child folders in the hierarchy from the parent folder and down.
         /// Does not return the parent folder itself.
         /// </summary>
@@ -149,4 +132,15 @@ namespace OpenSim.Framework
         /// <param name="folder">The id of the folder</param>
         void deleteInventoryFolder(LLUUID folder);
     }
-}
\ No newline at end of file
+    
+    public class InventoryDataInitialiser : PluginInitialiserBase
+    {
+        private string connect;
+        public InventoryDataInitialiser (string s) { connect = s; }
+        public override void Initialise (IPlugin plugin)
+        {
+            IInventoryDataPlugin p = plugin as IInventoryDataPlugin;
+            p.Initialise (connect);
+        }
+    }
+}
diff --git a/OpenSim/Framework/IUserData.cs b/OpenSim/Framework/IUserData.cs
index 5952713..27686c0 100644
--- a/OpenSim/Framework/IUserData.cs
+++ b/OpenSim/Framework/IUserData.cs
@@ -33,7 +33,7 @@ namespace OpenSim.Framework
     /// <summary>
     /// An interface for connecting to user storage servers.
     /// </summary>
-    public interface IUserData
+    public interface IUserData : IPlugin
     {
         /// <summary>
         /// Returns a user profile from a database via their UUID
@@ -154,18 +154,6 @@ namespace OpenSim.Framework
         bool InventoryTransferRequest(LLUUID from, LLUUID to, LLUUID inventory);
 
         /// <summary>
-        /// Returns the plugin version
-        /// </summary>
-        /// <returns>Plugin version in MAJOR.MINOR.REVISION.BUILD format</returns>
-        string Version {get;}
-
-        /// <summary>
-        /// Returns the plugin name
-        /// </summary>
-        /// <returns>Plugin name, eg MySQL User Provider</returns>
-        string Name {get;}
-
-        /// <summary>
         /// Initialises the plugin (artificial constructor)
         /// </summary>
         void Initialise(string connect);
@@ -182,4 +170,15 @@ namespace OpenSim.Framework
         void RemoveAttachment(LLUUID user, LLUUID item);
         List<LLUUID> GetAttachments(LLUUID user);
     }
-}
\ No newline at end of file
+    
+    public class UserDataInitialiser : PluginInitialiserBase
+    {
+        private string connect;
+        public UserDataInitialiser (string s) { connect = s; }
+        public override void Initialise (IPlugin plugin)
+        {
+            IUserData p = plugin as IUserData;
+            p.Initialise (connect);
+        }
+    }
+}
diff --git a/OpenSim/Framework/PluginLoader.cs b/OpenSim/Framework/PluginLoader.cs
index 616fa3e..3bc4de6 100644
--- a/OpenSim/Framework/PluginLoader.cs
+++ b/OpenSim/Framework/PluginLoader.cs
@@ -96,6 +96,11 @@ namespace OpenSim.Framework
             get { return loaded; } 
         }
 
+        public T Plugin
+        { 
+            get { return (loaded.Count == 1)? loaded [0] : default (T); } 
+        }
+
         public PluginLoader () 
         {
             Initialiser = new PluginInitialiserBase();
@@ -114,11 +119,26 @@ namespace OpenSim.Framework
             initialise_plugin_dir_ (dir);
         }
 
-        public void AddExtensionPoint (string extpoint)
+        public void Add (string extpoint)
         {
+            if (extpoints.Contains (extpoint))
+                return;
+            
             extpoints.Add (extpoint);
         }
 
+        public void Add (string extpoint, IPluginConstraint cons)
+        {
+            Add (extpoint);
+            AddConstraint (extpoint, cons);
+        }
+
+        public void Add (string extpoint, IPluginFilter filter)
+        {
+            Add (extpoint);
+            AddFilter (extpoint, filter);
+        }
+
         public void AddConstraint (string extpoint, IPluginConstraint cons)
         {
             constraints.Add (extpoint, cons);
@@ -131,7 +151,7 @@ namespace OpenSim.Framework
 
         public void Load (string extpoint)
         {
-            AddExtensionPoint (extpoint);
+            Add (extpoint);
             Load();
         }