Simplify friends caching by only doing this for root agents - no functions require caching for child agents.

This allows us to avoid unnecessary multiple calls to the friends service.
All friends functions originate from the root agent and only go to other root agents in existing code.
This also allows us to eliminate complex ref counting.

7 files changed, 29 insertions, 53 deletions

diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
index cd81df5..9899669 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
@@ -384,7 +384,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             set { m_startpos = value; }
         }
         public UUID AgentId { get { return m_agentId; } }
-        public ISceneAgent SceneAgent { get; private set; }
+        public ISceneAgent SceneAgent { get; set; }
         public UUID ActiveGroupId { get { return m_activeGroupID; } }
         public string ActiveGroupName { get { return m_activeGroupName; } }
         public ulong ActiveGroupPowers { get { return m_activeGroupPowers; } }
@@ -695,7 +695,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
         public virtual void Start()
         {
-            SceneAgent = m_scene.AddNewClient(this, PresenceType.User);
+            m_scene.AddNewClient(this, PresenceType.User);
 
             RefreshGroupMembership();
         }
diff --git a/OpenSim/Region/CoreModules/Avatar/Friends/FriendsModule.cs b/OpenSim/Region/CoreModules/Avatar/Friends/FriendsModule.cs
index d1a1af0..f3982ea 100644
--- a/OpenSim/Region/CoreModules/Avatar/Friends/FriendsModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Friends/FriendsModule.cs
@@ -57,7 +57,6 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
         {
             public UUID PrincipalID;
             public FriendInfo[] Friends;
-            public int Refcount;
 
             public bool IsFriend(string friend)
             {
@@ -255,6 +254,9 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
 
         private void OnNewClient(IClientAPI client)
         {
+            if (client.SceneAgent.IsChildAgent)
+                return;
+
             client.OnInstantMessage += OnInstantMessage;
             client.OnApproveFriendRequest += OnApproveFriendRequest;
             client.OnDenyFriendRequest += OnDenyFriendRequest;
@@ -281,23 +283,14 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
             UUID agentID = client.AgentId;
             lock (m_Friends)
             {
-                UserFriendData friendsData;
-                if (m_Friends.TryGetValue(agentID, out friendsData))
-                {
-                    friendsData.Refcount++;
-                    return false;
-                }
-                else
-                {
-                    friendsData = new UserFriendData();
-                    friendsData.PrincipalID = agentID;
-                    friendsData.Friends = GetFriendsFromService(client);
-                    friendsData.Refcount = 1;
+                UserFriendData friendsData = new UserFriendData();
+                friendsData.PrincipalID = agentID;
+                friendsData.Friends = GetFriendsFromService(client);
 
-                    m_Friends[agentID] = friendsData;
-                    return true;
-                }
+                m_Friends[agentID] = friendsData;
             }
+
+            return true;
         }
 
         private void OnClientClosed(UUID agentID, Scene scene)
@@ -307,23 +300,17 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
             {
                 // do this for root agents closing out
                 StatusChange(agentID, false);
-            }
 
-            lock (m_Friends)
-            {
-                UserFriendData friendsData;
-                if (m_Friends.TryGetValue(agentID, out friendsData))
-                {
-                    friendsData.Refcount--;
-                    if (friendsData.Refcount <= 0)
-                        m_Friends.Remove(agentID);
-                }
+                lock (m_Friends)
+                    m_Friends.Remove(agentID);
             }
         }
 
         private void OnMakeRootAgent(ScenePresence sp)
         {
-            RecacheFriends(sp.ControllingClient);
+            // FIXME: Ideally, we want to avoid doing this here since it sits the EventManager.OnMakeRootAgent event
+            // is on the critical path for transferring an avatar from one region to another.
+            CacheFriends(sp.ControllingClient);
         }
 
         private void OnClientLogin(IClientAPI client)
@@ -623,7 +610,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
             StoreFriendships(client.AgentId, friendID);
 
             // Update the local cache. 
-            RecacheFriends(client);
+            CacheFriends(client);
 
             //
             // Notify the friend
@@ -685,7 +672,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
                 client.SendAlertMessage("Unable to terminate friendship on this sim.");
 
             // Update local cache
-            RecacheFriends(client);
+            CacheFriends(client);
 
             client.SendTerminateFriend(exfriendID);
 
@@ -799,7 +786,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
                 friendClient.SendInstantMessage(im);
 
                 // Update the local cache
-                RecacheFriends(friendClient);
+                CacheFriends(friendClient);
 
                 // we're done
                 return true;
@@ -832,7 +819,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
                 // the friend in this sim as root agent
                 friendClient.SendTerminateFriend(exfriendID);
                 // update local cache
-                RecacheFriends(friendClient);
+                CacheFriends(friendClient);
                 // we're done
                 return true;
             }
@@ -933,19 +920,6 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
             return FriendsService.GetFriends(client.AgentId);
         }
 
-        protected void RecacheFriends(IClientAPI client)
-        {
-            // FIXME: Ideally, we want to avoid doing this here since it sits the EventManager.OnMakeRootAgent event
-            // is on the critical path for transferring an avatar from one region to another.
-            UUID agentID = client.AgentId;
-            lock (m_Friends)
-            {
-                UserFriendData friendsData;
-                if (m_Friends.TryGetValue(agentID, out friendsData))
-                    friendsData.Friends = GetFriendsFromService(client);
-            }
-        }
-
         /// <summary>
         /// Are friends cached on this simulator for a particular user?
         /// </summary>
diff --git a/OpenSim/Region/CoreModules/Avatar/Friends/HGFriendsModule.cs b/OpenSim/Region/CoreModules/Avatar/Friends/HGFriendsModule.cs
index e50a84a..7bc3018 100644
--- a/OpenSim/Region/CoreModules/Avatar/Friends/HGFriendsModule.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Friends/HGFriendsModule.cs
@@ -121,7 +121,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
             {
                 UUID agentID = client.AgentId;
                 // we do this only for the root agent
-                if (m_Friends[agentID].Refcount == 1)
+                if (!client.SceneAgent.IsChildAgent)
                 {
                     // We need to preload the user management cache with the names
                     // of foreign friends, just like we do with SOPs' creators
@@ -426,14 +426,14 @@ namespace OpenSim.Region.CoreModules.Avatar.Friends
                 agentClientCircuit = ((Scene)(agentClient.Scene)).AuthenticateHandler.GetAgentCircuitData(agentClient.CircuitCode);
                 agentUUI = Util.ProduceUserUniversalIdentifier(agentClientCircuit);
                 agentFriendService = agentClientCircuit.ServiceURLs["FriendsServerURI"].ToString();
-                RecacheFriends(agentClient);
+                CacheFriends(agentClient);
             }
             if (friendClient != null)
             {
                 friendClientCircuit = ((Scene)(friendClient.Scene)).AuthenticateHandler.GetAgentCircuitData(friendClient.CircuitCode);
                 friendUUI = Util.ProduceUserUniversalIdentifier(friendClientCircuit);
                 friendFriendService = friendClientCircuit.ServiceURLs["FriendsServerURI"].ToString();
-                RecacheFriends(friendClient);
+                CacheFriends(friendClient);
             }
 
             m_log.DebugFormat("[HGFRIENDS MODULE] HG Friendship! thisUUI={0}; friendUUI={1}; foreignThisFriendService={2}; foreignFriendFriendService={3}",
diff --git a/OpenSim/Region/Framework/Scenes/EventManager.cs b/OpenSim/Region/Framework/Scenes/EventManager.cs
index 7993abe..fe3438e 100644
--- a/OpenSim/Region/Framework/Scenes/EventManager.cs
+++ b/OpenSim/Region/Framework/Scenes/EventManager.cs
@@ -71,6 +71,7 @@ namespace OpenSim.Region.Framework.Scenes
         /// Triggered when a new client is added to the scene.
         /// </summary>
         /// <remarks>
+        /// This is triggered for both child and root agent client connections.
         /// Triggered before OnClientLogin.
         /// </remarks>
         public event OnNewClientDelegate OnNewClient;
@@ -191,7 +192,7 @@ namespace OpenSim.Region.Framework.Scenes
         public delegate void ClientClosed(UUID clientID, Scene scene);
 
         /// <summary>
-        /// Fired when a client is removed from a scene.
+        /// Fired when a client is removed from a scene whether it's a child or a root agent.
         /// </summary>
         /// <remarks>
         /// At the point of firing, the scene still contains the client's scene presence.
diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index c887b4e..60fe48f 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -2670,6 +2670,7 @@ namespace OpenSim.Region.Framework.Scenes
                     sp.IsChildAgent ? "child" : "root", sp.Name, RegionInfo.RegionName);
             }
 
+            client.SceneAgent = sp;
             m_LastLogin = Util.EnvironmentTickCount();
 
             // Cache the user's name
diff --git a/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs b/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
index 5cf478a..43548e6 100644
--- a/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
+++ b/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
@@ -55,7 +55,7 @@ namespace OpenSim.Region.OptionalModules.Agent.InternetRelayClientView.Server
 
         private UUID m_agentID = UUID.Random();
 
-        public ISceneAgent SceneAgent { get; private set; }
+        public ISceneAgent SceneAgent { get; set; }
 
         private string m_username;
         private string m_nick;
@@ -895,7 +895,7 @@ namespace OpenSim.Region.OptionalModules.Agent.InternetRelayClientView.Server
 
         public void Start()
         {
-            SceneAgent = m_scene.AddNewClient(this, PresenceType.User);
+            m_scene.AddNewClient(this, PresenceType.User);
 
             // Mimicking LLClientView which gets always set appearance from client.
             AvatarAppearance appearance;
diff --git a/OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs b/OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs
index 16ec34f..5ea5af7 100644
--- a/OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs
+++ b/OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs
@@ -72,7 +72,7 @@ namespace OpenSim.Region.OptionalModules.World.NPC
             get { return m_ownerID; }
         }
 
-        public ISceneAgent SceneAgent { get { throw new NotImplementedException(); } }
+        public ISceneAgent SceneAgent { get; set; }
 
         public void Say(string message)
         {