Add EventManager.OnSceneObjectPreSave() for future use. This is triggered immediately before a copy of the group is persisted to storage

2 files changed, 37 insertions, 3 deletions

diff --git a/OpenSim/Region/Framework/Scenes/EventManager.cs b/OpenSim/Region/Framework/Scenes/EventManager.cs
index 0b1f593..3b8d727 100644
--- a/OpenSim/Region/Framework/Scenes/EventManager.cs
+++ b/OpenSim/Region/Framework/Scenes/EventManager.cs
@@ -330,14 +330,26 @@ namespace OpenSim.Region.Framework.Scenes
         /// If the object is being attached, then the avatarID will be present.  If the object is being detached then
         /// the avatarID is UUID.Zero (I know, this doesn't make much sense but now it's historical).
         public delegate void Attach(uint localID, UUID itemID, UUID avatarID);
-        public event Attach OnAttach;
-        
-        public delegate void SceneObjectDelegate(SceneObjectGroup so);
+        public event Attach OnAttach;                
         
         /// <summary>
         /// Called immediately after an object is loaded from storage.
         /// </summary>
         public event SceneObjectDelegate OnSceneObjectLoaded;
+        public delegate void SceneObjectDelegate(SceneObjectGroup so);
+        
+        /// <summary>
+        /// Called immediately before an object is saved to storage.
+        /// </summary>
+        /// <param name="persistingSo">
+        /// The scene object being persisted.  
+        /// This is actually a copy of the original scene object so changes made here will be saved to storage but will not be kept in memory.
+        /// </param>
+        /// <param name="originalSo">
+        /// The original scene object being persisted.  Changes here will stay in memory but will not be saved to storage on this save.
+        /// </param>
+        public event SceneObjectPreSaveDelegate OnSceneObjectPreSave;
+        public delegate void SceneObjectPreSaveDelegate(SceneObjectGroup persistingSo, SceneObjectGroup originalSo);
 
         public delegate void RegionUp(GridRegion region);
         public event RegionUp OnRegionUp;       
@@ -2040,6 +2052,27 @@ namespace OpenSim.Region.Framework.Scenes
                     }
                 }
             }
+        }  
+        
+        public void TriggerOnSceneObjectPreSave(SceneObjectGroup persistingSo, SceneObjectGroup originalSo)
+        {
+            SceneObjectPreSaveDelegate handler = OnSceneObjectPreSave;
+            if (handler != null)
+            {
+                foreach (SceneObjectPreSaveDelegate d in handler.GetInvocationList())
+                {
+                    try
+                    {
+                        d(persistingSo, originalSo);
+                    }
+                    catch (Exception e)
+                    {
+                        m_log.ErrorFormat(
+                            "[EVENT MANAGER]: Delegate for TriggerOnSceneObjectPreSave failed - continuing.  {0} {1}", 
+                            e.Message, e.StackTrace);
+                    }
+                }
+            }
         }        
     }
 }
\ No newline at end of file
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
index 17275d0..c2f9117 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs
@@ -1479,6 +1479,7 @@ namespace OpenSim.Region.Framework.Scenes
                         backup_group.RootPart.ParticleSystem = RootPart.ParticleSystem;
                         HasGroupChanged = false;
 
+                        m_scene.EventManager.TriggerOnSceneObjectPreSave(backup_group, this);
                         datastore.StoreObject(backup_group, m_scene.RegionInfo.RegionID);
 
                         backup_group.ForEachPart(delegate(SceneObjectPart part)