From 269a2e4b887b9841309d4472508b19324a91d80d Mon Sep 17 00:00:00 2001
From: Justin Clarke Casey
Date: Tue, 22 Apr 2008 17:24:13 +0000
Subject: * Allow folder renaming to complete after an agent inventory has been
 received by a region from the inventory service * This replaces the old
 behaviour of failing straight away, which could cause lost updates if the
 inventory service was slow in responding * This is the first baby step to
 making all inventory requests behave this way, to reduce inventory lossage

---
 .../Communications/Cache/CachedUserInfo.cs         | 62 +++++++++++++++++++---
 .../Cache/UserProfileCacheService.cs               | 36 +++++++++++++
 2 files changed, 90 insertions(+), 8 deletions(-)

(limited to 'OpenSim/Framework/Communications/Cache')

diff --git a/OpenSim/Framework/Communications/Cache/CachedUserInfo.cs b/OpenSim/Framework/Communications/Cache/CachedUserInfo.cs
index a245af1..3d7ada3 100644
--- a/OpenSim/Framework/Communications/Cache/CachedUserInfo.cs
+++ b/OpenSim/Framework/Communications/Cache/CachedUserInfo.cs
@@ -45,25 +45,31 @@ namespace OpenSim.Framework.Communications.Cache
         /// The comms manager holds references to services (user, grid, inventory, etc.)
         /// </summary>        
         private readonly CommunicationsManager m_commsManager;
-
-        private UserProfileData m_userProfile;        
+        
         public UserProfileData UserProfile { get { return m_userProfile; } }
+        private UserProfileData m_userProfile;                
 
-
+        /// <summary>
+        /// Has we received the user's inventory from the inventory service?
+        /// </summary>
         private bool m_hasInventory;
         
         /// <summary>
+        /// Inventory requests waiting for receipt of this user's inventory from the inventory service.
+        /// </summary>
+        private readonly IList<IInventoryRequest> m_pendingRequests = new List<IInventoryRequest>();         
+        
+        /// <summary>
         /// Has this user info object yet received its inventory information from the invetnroy service?
         /// </summary>
         public bool HasInventory { get { return m_hasInventory; } }
         
-        // FIXME: These need to be hidden behind accessors
         private InventoryFolderImpl m_rootFolder;
         public InventoryFolderImpl RootFolder { get { return m_rootFolder; } }        
         
         /// <summary>
-        /// Stores received folders for which we have not yet received the parents.
-        /// </summary></param>
+        /// FIXME: This could be contained within a local variable - it doesn't need to be a field
+        /// </summary>
         private IDictionary<LLUUID, IList<InventoryFolderImpl>> pendingCategorizationFolders 
             = new Dictionary<LLUUID, IList<InventoryFolderImpl>>();
 
@@ -79,6 +85,27 @@ namespace OpenSim.Framework.Communications.Cache
         }
         
         /// <summary>
+        /// This allows a request to be added to be processed once we receive a user's inventory
+        /// from the inventory service.  If we already have the inventory, the request
+        /// is executed immediately instead.
+        /// </summary>
+        /// <param name="parent"></param>
+        public void AddRequest(IInventoryRequest request)
+        {
+            lock (m_pendingRequests)
+            {
+                if (m_hasInventory)
+                {
+                    request.Execute();
+                }
+                else
+                {
+                    m_pendingRequests.Add(request);
+                }
+            }
+        }
+        
+        /// <summary>
         /// Store a folder pending categorization when its parent is received.
         /// </summary>
         /// <param name="folder"></param>
@@ -148,8 +175,19 @@ namespace OpenSim.Framework.Communications.Cache
             {
                 m_log.ErrorFormat("[INVENTORY CACHE]: Error processing inventory received from inventory service, {0}", e);
             } 
-            
-            m_hasInventory = true;
+                                    
+            // Deal with pending requests
+            lock (m_pendingRequests)
+            {
+                // We're going to change inventory status within the lock to avoid a race condition
+                // where requests are processed after the AddRequest() method has been called.
+                m_hasInventory = true;
+                
+                foreach (IInventoryRequest request in m_pendingRequests)
+                {
+                    request.Execute();
+                }
+            }
         }
 
         /// <summary>
@@ -288,4 +326,12 @@ namespace OpenSim.Framework.Communications.Cache
             return result;
         }
     }
+    
+    /// <summary>
+    /// Should be implemented by callers which require a callback when the user's inventory is received
+    /// </summary>    
+    public interface IInventoryRequest
+    {
+        void Execute();
+    }
 }
diff --git a/OpenSim/Framework/Communications/Cache/UserProfileCacheService.cs b/OpenSim/Framework/Communications/Cache/UserProfileCacheService.cs
index bf8ff40..cbf2ded 100644
--- a/OpenSim/Framework/Communications/Cache/UserProfileCacheService.cs
+++ b/OpenSim/Framework/Communications/Cache/UserProfileCacheService.cs
@@ -201,6 +201,9 @@ namespace OpenSim.Framework.Communications.Cache
         public void HandleUpdateInventoryFolder(IClientAPI remoteClient, LLUUID folderID, ushort type, string name,
                                                 LLUUID parentID)
         {
+//            m_log.DebugFormat(
+//                "[AGENT INVENTORY] Updating inventory folder {0} {1} for {2} {3}", folderID, name, remoteClient.Name, remoteClient.AgentId);
+            
             CachedUserInfo userProfile;
 
             if (m_userProfiles.TryGetValue(remoteClient.AgentId, out userProfile))
@@ -216,6 +219,10 @@ namespace OpenSim.Framework.Communications.Cache
                     baseFolder.Version = userProfile.RootFolder.Version;
                     m_commsManager.InventoryService.AddNewInventoryFolder(remoteClient.AgentId, baseFolder);
                 }
+                else
+                {
+                    userProfile.AddRequest(new UpdateFolderRequest(this, remoteClient, folderID, type, name, parentID));
+                }
             }
         }
 
@@ -492,4 +499,33 @@ namespace OpenSim.Framework.Communications.Cache
             }
         }
     }
+    
+    /// <summary>
+    /// Used to create an update folder request if we haven't yet received the user's inventory
+    /// </summary>
+    internal class UpdateFolderRequest : IInventoryRequest
+    {
+        private UserProfileCacheService m_userProfileCacheService;
+        private IClientAPI m_client;
+        private LLUUID m_folderID;
+        private ushort m_type;
+        private string m_name;
+        private LLUUID m_parentID;
+        
+        internal UpdateFolderRequest(
+            UserProfileCacheService cacheService, IClientAPI client, LLUUID folderID, ushort type, string name, LLUUID parentID)
+        {
+            m_userProfileCacheService = cacheService;
+            m_client = client;
+            m_folderID = folderID;
+            m_type = type;
+            m_name = name;
+            m_parentID = parentID;
+        }
+        
+        public void Execute()
+        {
+            m_userProfileCacheService.HandleUpdateInventoryFolder(m_client, m_folderID, m_type, m_name, m_parentID);
+        }
+    }
 }
-- 
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