Add DAExampleModule to demonstrate dynamic attributes

This module demonstrates that we can add an arbitrary persisted value to SOP without any changes to core code.
Every time the object is moved, the move record is updated and the users in the scene alerted
The number of moves is persisted over server restarts in sqlite

OpenSim/Region/CoreModules/Framework/DynamicAttributes/DAExampleModule.cs

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using log4net;
+using Mono.Addins;
+using Nini.Config;
+using OpenMetaverse;
+using OpenMetaverse.Packets;
+using OpenMetaverse.StructuredData;
+using OpenSim.Framework;
+using OpenSim.Region.Framework;
+using OpenSim.Region.Framework.Interfaces;
+using OpenSim.Region.Framework.Scenes;
+
+namespace OpenSim.Region.Framework.DynamicAttributes.DAExampleModule
+{
+    [Extension(Path = "/OpenSim/RegionModules", NodeName = "RegionModule", Id = "DAExampleModule")]
+    public class DAExampleModule : INonSharedRegionModule
+    {
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        
+        protected Scene m_scene;
+        protected IDialogModule m_dialogMod;
+        
+        public string Name { get { return "DAExample Module"; } }        
+        public Type ReplaceableInterface { get { return null; } }        
+
+        public void Initialise(IConfigSource source) {}
+        
+        public void AddRegion(Scene scene)
+        {
+            m_scene = scene;
+            m_scene.EventManager.OnSceneGroupMove += OnSceneGroupMove;
+            m_dialogMod = m_scene.RequestModuleInterface<IDialogModule>();
+        }
+        
+        public void RemoveRegion(Scene scene) 
+        {
+            m_scene.EventManager.OnSceneGroupMove -= OnSceneGroupMove;
+        }
+        
+        public void RegionLoaded(Scene scene) {}
+        
+        public void Close() 
+        {
+            RemoveRegion(m_scene);
+        }
+        
+        protected bool OnSceneGroupMove(UUID groupId, Vector3 delta)
+        {
+            SceneObjectPart sop = m_scene.GetSceneObjectPart(groupId);
+            OSDMap attrs = sop.DynAttrs;
+            
+            lock (attrs)
+            {
+                OSDInteger newValue;
+                
+                if (!attrs.ContainsKey("moves"))
+                    newValue = new OSDInteger(1);
+                else
+                    newValue = new OSDInteger(((OSDInteger)attrs["moves"]).AsInteger() + 1);
+                    
+                attrs["moves"] = newValue;    
+                
+                m_dialogMod.SendGeneralAlert(string.Format("{0} {1} moved {2} times", sop.Name, sop.UUID, newValue));
+            }     
+            
+            return true;
+        }
+    }
+}