From c83da03183135919adf3846b7436aa55a98d33a0 Mon Sep 17 00:00:00 2001
From: Melanie Thielker <melanie@t-data.com>
Date: Sun, 16 Aug 2015 01:45:15 +0200
Subject: [PATCH] Create want and need lists for agent data interchange
 formats.

---
 OpenSim/Region/Framework/Scenes/SceneBase.cs | 44 ++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/OpenSim/Region/Framework/Scenes/SceneBase.cs b/OpenSim/Region/Framework/Scenes/SceneBase.cs
index 6f172e7611..a928db4923 100644
--- a/OpenSim/Region/Framework/Scenes/SceneBase.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneBase.cs
@@ -82,6 +82,13 @@ namespace OpenSim.Region.Framework.Scenes
         /// </value>
         protected Dictionary<Type, List<object>> ModuleInterfaces = new Dictionary<Type, List<object>>();
 
+        /// <summary>
+        /// These two objects hold the information about any formats used
+        /// by modules that hold agent specific data.
+        /// </summary>
+        protected List<UUID> FormatsOffered = new List<UUID>();
+        protected Dictionary<object, List<UUID>> FormatsWanted = new Dictionary<object, List<UUID>>();
+
         protected Dictionary<string, object> ModuleAPIMethods = new Dictionary<string, object>();
 
         /// <value>
@@ -367,6 +374,31 @@ namespace OpenSim.Region.Framework.Scenes
             return m_moduleCommanders;
         }
 
+        protected void CheckAndAddAgentDataFormats(object mod)
+        {
+            if (!(mod is IAgentStatefulModule))
+                return;
+
+            IAgentStatefulModule m = (IAgentStatefulModule)mod;
+
+            List<UUID> renderFormats = m.GetRenderStateFormats();
+            List<UUID> acceptFormats = m.GetAcceptStateFormats();
+
+            foreach (UUID render in renderFormats)
+            {
+                if (!(FormatsOffered.Contains(render)))
+                    FormatsOffered.Add(render);
+            }
+
+            if (acceptFormats.Count == 0)
+                return;
+
+            if (FormatsWanted.ContainsKey(mod))
+                return;
+
+            FormatsWanted[mod] = acceptFormats;
+        }
+
         /// <summary>
         /// Register an interface to a region module.  This allows module methods to be called directly as
         /// well as via events.  If there is already a module registered for this interface, it is not replaced
@@ -389,6 +421,8 @@ namespace OpenSim.Region.Framework.Scenes
 
             l.Add(mod);
 
+            CheckAndAddAgentDataFormats(mod);
+
             if (mod is IEntityCreator)
             {
                 IEntityCreator entityCreator = (IEntityCreator)mod;
@@ -401,6 +435,14 @@ namespace OpenSim.Region.Framework.Scenes
 
         public void UnregisterModuleInterface<M>(M mod)
         {
+            // We can't unregister agent stateful modules because
+            // that would require much more data to be held about formats
+            // and would make that code slower and less efficient.
+            // No known modules are unregistered anyway, ever, unless
+            // the simulator shuts down anyway.
+            if (mod is IAgentStatefulModule)
+                return;
+
             List<Object> l;
             if (ModuleInterfaces.TryGetValue(typeof(M), out l))
             {
@@ -431,6 +473,8 @@ namespace OpenSim.Region.Framework.Scenes
 
             l.Add(mod);
 
+            CheckAndAddAgentDataFormats(mod);
+
             if (mod is IEntityCreator)
             {
                 IEntityCreator entityCreator = (IEntityCreator)mod;