/OpenSim/Region/Framework/Scenes/Scene.cs

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/*
 * 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 copyrightD
 *       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.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Text;
using System.Threading;
using System.Timers;
using System.Xml;
using Nini.Config;
using OpenMetaverse;
using OpenMetaverse.Packets;
using OpenMetaverse.Imaging;
using OpenSim.Framework;
using OpenSim.Services.Interfaces;
using OpenSim.Framework.Communications;
using OpenSim.Framework.Communications.Cache;
using OpenSim.Framework.Communications.Clients;
using OpenSim.Framework.Console;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes.Scripting;
using OpenSim.Region.Framework.Scenes.Serialization;
using OpenSim.Region.Physics.Manager;
using Timer=System.Timers.Timer;
using TPFlags = OpenSim.Framework.Constants.TeleportFlags;
using GridRegion = OpenSim.Services.Interfaces.GridRegion;

namespace OpenSim.Region.Framework.Scenes
{
    public delegate bool FilterAvatarList(ScenePresence avatar);

    public partial class Scene : SceneBase
    {
        public enum UpdatePrioritizationSchemes {
            Time = 0,
            Distance = 1,
            SimpleAngularDistance = 2,
            FrontBack = 3,
        }

        public delegate void SynchronizeSceneHandler(Scene scene);
        public SynchronizeSceneHandler SynchronizeScene = null;

        /* Used by the loadbalancer plugin on GForge */
        protected int m_splitRegionID = 0;
        public int SplitRegionID
        {
            get { return m_splitRegionID; }
            set { m_splitRegionID = value; }
        }

        private const long DEFAULT_MIN_TIME_FOR_PERSISTENCE = 60L;
        private const long DEFAULT_MAX_TIME_FOR_PERSISTENCE = 600L;

        #region Fields

        protected Timer m_restartWaitTimer = new Timer();

        public SimStatsReporter StatsReporter;

        protected List<RegionInfo> m_regionRestartNotifyList = new List<RegionInfo>();
        protected List<RegionInfo> m_neighbours = new List<RegionInfo>();

        private volatile int m_bordersLocked = 0;
        public bool BordersLocked
        {
            get { return m_bordersLocked == 1; }
            set
            {
                if (value == true)
                    m_bordersLocked = 1;
                else
                    m_bordersLocked = 0;
            }
        }
        public List<Border> NorthBorders = new List<Border>();
        public List<Border> EastBorders = new List<Border>();
        public List<Border> SouthBorders = new List<Border>();
        public List<Border> WestBorders = new List<Border>();

        /// <value>
        /// The scene graph for this scene
        /// </value>
        /// TODO: Possibly stop other classes being able to manipulate this directly.
        private SceneGraph m_sceneGraph;

        /// <summary>
        /// Are we applying physics to any of the prims in this scene?
        /// </summary>
        public bool m_physicalPrim;
        public float m_maxNonphys = 256;
        public float m_maxPhys = 10;
        public bool m_clampPrimSize;
        public bool m_trustBinaries;
        public bool m_allowScriptCrossings;
        public bool m_useFlySlow;
        public bool m_usePreJump;
        public bool m_seeIntoRegionFromNeighbor;
        // TODO: need to figure out how allow client agents but deny
        // root agents when ACL denies access to root agent
        public bool m_strictAccessControl = true;
        public int MaxUndoCount = 5;
        private int m_RestartTimerCounter;
        private readonly Timer m_restartTimer = new Timer(15000); // Wait before firing
        private int m_incrementsof15seconds;
        private volatile bool m_backingup;
        private bool m_useAsyncWhenPossible;

        private Dictionary<UUID, ReturnInfo> m_returns = new Dictionary<UUID, ReturnInfo>();
        private Dictionary<UUID, SceneObjectGroup> m_groupsWithTargets = new Dictionary<UUID, SceneObjectGroup>();

        protected string m_simulatorVersion = "OpenSimulator Server";

        protected ModuleLoader m_moduleLoader;
        protected StorageManager m_storageManager;
        protected AgentCircuitManager m_authenticateHandler;
        public CommunicationsManager CommsManager;

        protected SceneCommunicationService m_sceneGridService;
        public bool LoginsDisabled = true;

        public new float TimeDilation
        {
            get { return m_sceneGraph.PhysicsScene.TimeDilation; }
        }

        public SceneCommunicationService SceneGridService
        {
            get { return m_sceneGridService; }
        }

        public IXfer XferManager;

        protected IAssetService m_AssetService;
        protected IAuthorizationService m_AuthorizationService;

        private Object m_heartbeatLock = new Object();

        public IAssetService AssetService
        {
            get
            {
                if (m_AssetService == null)
                {
                    m_AssetService = RequestModuleInterface<IAssetService>();

                    if (m_AssetService == null)
                    {
                        throw new Exception("No IAssetService available.");
                    }
                }

                return m_AssetService;
            }
        }
        
        public IAuthorizationService AuthorizationService
        {
            get
            {
                if (m_AuthorizationService == null)
                {
                    m_AuthorizationService = RequestModuleInterface<IAuthorizationService>();

                    if (m_AuthorizationService == null)
                    {
                        // don't throw an exception if no authorization service is set for the time being
                         m_log.InfoFormat("[SCENE]: No Authorization service is configured");
                    }
                }

                return m_AuthorizationService;
            }
        }

        protected IInventoryService m_InventoryService;

        public IInventoryService InventoryService
        {
            get
            {
                if (m_InventoryService == null)
                {
                    m_InventoryService = RequestModuleInterface<IInventoryService>();

                    if (m_InventoryService == null)
                    {
                        throw new Exception("No IInventoryService available. This could happen if the config_include folder doesn't exist or if the OpenSim.ini [Architecture] section isn't set.  Please also check that you have the correct version of your inventory service dll.  Sometimes old versions of this dll will still exist.  Do a clean checkout and re-create the opensim.ini from the opensim.ini.example.");
                    }
                }

                return m_InventoryService;
            }
        }

        protected IGridService m_GridService;

        public IGridService GridService
        {
            get
            {
                if (m_GridService == null)
                {
                    m_GridService = RequestModuleInterface<IGridService>();

                    if (m_GridService == null)
                    {
                        throw new Exception("No IGridService available. This could happen if the config_include folder doesn't exist or if the OpenSim.ini [Architecture] section isn't set.  Please also check that you have the correct version of your inventory service dll.  Sometimes old versions of this dll will still exist.  Do a clean checkout and re-create the opensim.ini from the opensim.ini.example.");
                    }
                }

                return m_GridService;
            }
        }

        protected IXMLRPC m_xmlrpcModule;
        protected IWorldComm m_worldCommModule;
        protected IAvatarFactory m_AvatarFactory;
        public IAvatarFactory AvatarFactory
        {
            get { return m_AvatarFactory; }
        }
        protected IConfigSource m_config;
        protected IRegionSerialiserModule m_serialiser;
        protected IInterregionCommsOut m_interregionCommsOut;
        protected IInterregionCommsIn m_interregionCommsIn;
        protected IDialogModule m_dialogModule;
        protected ITeleportModule m_teleportModule;

        protected ICapabilitiesModule m_capsModule;
        public ICapabilitiesModule CapsModule
        {
            get { return m_capsModule; }
        }

        protected override IConfigSource GetConfig()
        {
            return m_config;
        }

        // Central Update Loop

        protected int m_fps = 10;
        protected uint m_frame;
        protected float m_timespan = 0.089f;
        protected DateTime m_lastupdate = DateTime.UtcNow;

        private int m_update_physics = 1;
        private int m_update_entitymovement = 1;
        private int m_update_objects = 1; // Update objects which have scheduled themselves for updates
        private int m_update_presences = 1; // Update scene presence movements
        private int m_update_events = 1;
        private int m_update_backup = 200;
        private int m_update_terrain = 50;
        private int m_update_land = 1;

        private int frameMS;
        private int physicsMS2;
        private int physicsMS;
        private int otherMS;
        private int tempOnRezMS;
        private int eventMS;
        private int backupMS;
        private int terrainMS;
        private int landMS;
        private int lastCompletedFrame;

        public int MonitorFrameTime { get { return frameMS; } }
        public int MonitorPhysicsUpdateTime { get { return physicsMS; } }
        public int MonitorPhysicsSyncTime { get { return physicsMS2; } }
        public int MonitorOtherTime { get { return otherMS; } }
        public int MonitorTempOnRezTime { get { return tempOnRezMS; } }
        public int MonitorEventTime { get { return eventMS; } } // This may need to be divided into each event?
        public int MonitorBackupTime { get { return backupMS; } }
        public int MonitorTerrainTime { get { return terrainMS; } }
        public int MonitorLandTime { get { return landMS; } }
        public int MonitorLastFrameTick { get { return lastCompletedFrame; } }

        private bool m_physics_enabled = true;
        private bool m_scripts_enabled = true;
        private string m_defaultScriptEngine;
        private int m_LastLogin;
        private Thread HeartbeatThread;
        private volatile bool shuttingdown;

        private int m_lastUpdate;
        private bool m_firstHeartbeat = true;

        private UpdatePrioritizationSchemes m_update_prioritization_scheme = UpdatePrioritizationSchemes.Time;
        private bool m_reprioritization_enabled = true;
        private double m_reprioritization_interval = 5000.0;
        private double m_root_reprioritization_distance = 10.0;
        private double m_child_reprioritization_distance = 20.0;

        private object m_deleting_scene_object = new object();

        // the minimum time that must elapse before a changed object will be considered for persisted
        public long m_dontPersistBefore = DEFAULT_MIN_TIME_FOR_PERSISTENCE * 10000000L;
        // the maximum time that must elapse before a changed object will be considered for persisted
        public long m_persistAfter = DEFAULT_MAX_TIME_FOR_PERSISTENCE * 10000000L;

        #endregion

        #region Properties

        public UpdatePrioritizationSchemes UpdatePrioritizationScheme { get { return this.m_update_prioritization_scheme; } }
        public bool IsReprioritizationEnabled { get { return m_reprioritization_enabled; } }
        public double ReprioritizationInterval { get { return m_reprioritization_interval; } }
        public double RootReprioritizationDistance { get { return m_root_reprioritization_distance; } }
        public double ChildReprioritizationDistance { get { return m_child_reprioritization_distance; } }

        public AgentCircuitManager AuthenticateHandler
        {
            get { return m_authenticateHandler; }
        }

        public SceneGraph SceneContents
        {
            get { return m_sceneGraph; }
        }

        // an instance to the physics plugin's Scene object.
        public PhysicsScene PhysicsScene
        {
            get { return m_sceneGraph.PhysicsScene; }
            set
            {
                // If we're not doing the initial set
                // Then we've got to remove the previous
                // event handler
                if (PhysicsScene != null && PhysicsScene.SupportsNINJAJoints)
                {
                    PhysicsScene.OnJointMoved -= jointMoved;
                    PhysicsScene.OnJointDeactivated -= jointDeactivated;
                    PhysicsScene.OnJointErrorMessage -= jointErrorMessage;
                }

                m_sceneGraph.PhysicsScene = value;

                if (PhysicsScene != null && m_sceneGraph.PhysicsScene.SupportsNINJAJoints)
                {
                    // register event handlers to respond to joint movement/deactivation
                    PhysicsScene.OnJointMoved += jointMoved;
                    PhysicsScene.OnJointDeactivated += jointDeactivated;
                    PhysicsScene.OnJointErrorMessage += jointErrorMessage;
                }
            }
        }

        // This gets locked so things stay thread safe.
        public object SyncRoot
        {
            get { return m_sceneGraph.m_syncRoot; }
        }

        /// <summary>
        /// This is for llGetRegionFPS
        /// </summary>
        public float SimulatorFPS
        {
            get { return StatsReporter.getLastReportedSimFPS(); }
        }
        
        public float[] SimulatorStats
        {
            get { return StatsReporter.getLastReportedSimStats(); }
        }

        public string DefaultScriptEngine
        {
            get { return m_defaultScriptEngine; }
        }

        public EntityManager Entities
        {
            get { return m_sceneGraph.Entities; }
        }

        public Dictionary<UUID, ScenePresence> m_restorePresences
        {
            get { return m_sceneGraph.RestorePresences; }
            set { m_sceneGraph.RestorePresences = value; }
        }

        public int objectCapacity = 45000;

        #endregion

        #region BinaryStats

        public class StatLogger
        {
            public DateTime StartTime;
            public string Path;
            public System.IO.BinaryWriter Log;
        }
        static StatLogger m_statLog = null;
        static TimeSpan m_statLogPeriod = TimeSpan.FromSeconds(300);
        static string m_statsDir = String.Empty;
        static Object m_statLockObject = new Object();
        private void LogSimStats(SimStats stats)
        {
            SimStatsPacket pack = new SimStatsPacket();
            pack.Region = new SimStatsPacket.RegionBlock();
            pack.Region.RegionX = stats.RegionX;
            pack.Region.RegionY = stats.RegionY;
            pack.Region.RegionFlags = stats.RegionFlags;
            pack.Region.ObjectCapacity = stats.ObjectCapacity;
            //pack.Region = //stats.RegionBlock;
            pack.Stat = stats.StatsBlock;
            pack.Header.Reliable = false;

            // note that we are inside the reporter lock when called
            DateTime now = DateTime.Now;

            // hide some time information into the packet
            pack.Header.Sequence = (uint)now.Ticks;

            lock (m_statLockObject) // m_statLog is shared so make sure there is only executer here
            {
                try
                {
                    if (m_statLog == null || now > m_statLog.StartTime + m_statLogPeriod)
                    {
                        // First log file or time has expired, start writing to a new log file
                        if (m_statLog != null && m_statLog.Log != null)
                        {
                            m_statLog.Log.Close();
                        }
                        m_statLog = new StatLogger();
                        m_statLog.StartTime = now;
                        m_statLog.Path = (m_statsDir.Length > 0 ? m_statsDir + System.IO.Path.DirectorySeparatorChar.ToString() : "")
                                + String.Format("stats-{0}.log", now.ToString("yyyyMMddHHmmss"));
                        m_statLog.Log = new BinaryWriter(File.Open(m_statLog.Path, FileMode.Append, FileAccess.Write));
                    }

                    // Write the serialized data to disk
                    if (m_statLog != null && m_statLog.Log != null)
                        m_statLog.Log.Write(pack.ToBytes());
                }
                catch (Exception ex)
                {
                    m_log.Error("statistics gathering failed: " + ex.Message, ex);
                    if (m_statLog != null && m_statLog.Log != null)
                    {
                        m_statLog.Log.Close();
                    }
                    m_statLog = null;
                }
            }
            return;
        }

        #endregion

        #region Constructors

        public Scene(RegionInfo regInfo, AgentCircuitManager authen,
                     CommunicationsManager commsMan, SceneCommunicationService sceneGridService,
                     StorageManager storeManager,
                     ModuleLoader moduleLoader, bool dumpAssetsToFile, bool physicalPrim,
                     bool SeeIntoRegionFromNeighbor, IConfigSource config, string simulatorVersion)
        {
            m_config = config;

            Random random = new Random();
            
            BordersLocked = true;

            Border northBorder = new Border();
            northBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, (int)Constants.RegionSize);  //<---
            northBorder.CrossDirection = Cardinals.N;
            NorthBorders.Add(northBorder);

            Border southBorder = new Border();
            southBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, 0);    //--->
            southBorder.CrossDirection = Cardinals.S;
            SouthBorders.Add(southBorder);

            Border eastBorder = new Border();
            eastBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, (int)Constants.RegionSize);   //<---
            eastBorder.CrossDirection = Cardinals.E;
            EastBorders.Add(eastBorder);

            Border westBorder = new Border();
            westBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, 0);     //--->
            westBorder.CrossDirection = Cardinals.W;
            WestBorders.Add(westBorder);

            BordersLocked = false;

            m_lastAllocatedLocalId = (uint)(random.NextDouble() * (double)(uint.MaxValue/2))+(uint)(uint.MaxValue/4);
            m_moduleLoader = moduleLoader;
            m_authenticateHandler = authen;
            CommsManager = commsMan;
            m_sceneGridService = sceneGridService;
            m_storageManager = storeManager;
            m_regInfo = regInfo;
            m_regionHandle = m_regInfo.RegionHandle;
            m_regionName = m_regInfo.RegionName;
            m_datastore = m_regInfo.DataStore;
            m_lastUpdate = Util.EnvironmentTickCount();

            m_physicalPrim = physicalPrim;
            m_seeIntoRegionFromNeighbor = SeeIntoRegionFromNeighbor;

            m_eventManager = new EventManager();
            m_permissions = new ScenePermissions(this);

            m_asyncSceneObjectDeleter = new AsyncSceneObjectGroupDeleter(this);
            m_asyncSceneObjectDeleter.Enabled = true;

            // Load region settings
            m_regInfo.RegionSettings = m_storageManager.DataStore.LoadRegionSettings(m_regInfo.RegionID);
            if (m_storageManager.EstateDataStore != null)
            {
                m_regInfo.EstateSettings = m_storageManager.EstateDataStore.LoadEstateSettings(m_regInfo.RegionID);
            }

            //Bind Storage Manager functions to some land manager functions for this scene
            EventManager.OnLandObjectAdded +=
                new EventManager.LandObjectAdded(m_storageManager.DataStore.StoreLandObject);
            EventManager.OnLandObjectRemoved +=
                new EventManager.LandObjectRemoved(m_storageManager.DataStore.RemoveLandObject);

            m_sceneGraph = new SceneGraph(this, m_regInfo);

            // If the scene graph has an Unrecoverable error, restart this sim.
            // Currently the only thing that causes it to happen is two kinds of specific
            // Physics based crashes.
            //
            // Out of memory
            // Operating system has killed the plugin
            m_sceneGraph.UnRecoverableError += RestartNow;

            RegisterDefaultSceneEvents();

            DumpAssetsToFile = dumpAssetsToFile;

            m_scripts_enabled = !RegionInfo.RegionSettings.DisableScripts;

            m_physics_enabled = !RegionInfo.RegionSettings.DisablePhysics;

            StatsReporter = new SimStatsReporter(this);
            StatsReporter.OnSendStatsResult += SendSimStatsPackets;
            StatsReporter.OnStatsIncorrect += m_sceneGraph.RecalculateStats;

            StatsReporter.SetObjectCapacity(objectCapacity);

            // Old
            /*
            m_simulatorVersion = simulatorVersion
                + " (OS " + Util.GetOperatingSystemInformation() + ")"
                + " ChilTasks:" + m_seeIntoRegionFromNeighbor.ToString()
                + " PhysPrim:" + m_physicalPrim.ToString();
            */

            m_simulatorVersion = simulatorVersion + " (" + Util.GetRuntimeInformation() + ")";

            try
            {
                // Region config overrides global config
                //
                IConfig startupConfig = m_config.Configs["Startup"];

                // Should we try to run loops synchronously or asynchronously?
                m_useAsyncWhenPossible = startupConfig.GetBoolean("use_async_when_possible", false);

                //Animation states
                m_useFlySlow = startupConfig.GetBoolean("enableflyslow", false);
                // TODO: Change default to true once the feature is supported
                m_usePreJump = startupConfig.GetBoolean("enableprejump", false);

                m_maxNonphys = startupConfig.GetFloat("NonPhysicalPrimMax", m_maxNonphys);
                if (RegionInfo.NonphysPrimMax > 0)
                {
                    m_maxNonphys = RegionInfo.NonphysPrimMax;
                }

                m_maxPhys = startupConfig.GetFloat("PhysicalPrimMax", m_maxPhys);

                if (RegionInfo.PhysPrimMax > 0)
                {
                    m_maxPhys = RegionInfo.PhysPrimMax;
                }

                // Here, if clamping is requested in either global or
                // local config, it will be used
                //
                m_clampPrimSize = startupConfig.GetBoolean("ClampPrimSize", m_clampPrimSize);
                if (RegionInfo.ClampPrimSize)
                {
                    m_clampPrimSize = true;
                }

                m_trustBinaries = startupConfig.GetBoolean("TrustBinaries", m_trustBinaries);
                m_allowScriptCrossings = startupConfig.GetBoolean("AllowScriptCrossing", m_allowScriptCrossings);
                m_dontPersistBefore =
                  startupConfig.GetLong("MinimumTimeBeforePersistenceConsidered", DEFAULT_MIN_TIME_FOR_PERSISTENCE);
                m_dontPersistBefore *= 10000000;
                m_persistAfter =
                  startupConfig.GetLong("MaximumTimeBeforePersistenceConsidered", DEFAULT_MAX_TIME_FOR_PERSISTENCE);
                m_persistAfter *= 10000000;

                m_defaultScriptEngine = startupConfig.GetString("DefaultScriptEngine", "XEngine");

                IConfig packetConfig = m_config.Configs["PacketPool"];
                if (packetConfig != null)
                {
                    PacketPool.Instance.RecyclePackets = packetConfig.GetBoolean("RecyclePackets", true);
                    PacketPool.Instance.RecycleDataBlocks = packetConfig.GetBoolean("RecycleDataBlocks", true);
                }

                m_strictAccessControl = startupConfig.GetBoolean("StrictAccessControl", m_strictAccessControl);

                IConfig interest_management_config = m_config.Configs["InterestManagement"];
                if (interest_management_config != null)
                {
                    string update_prioritization_scheme = interest_management_config.GetString("UpdatePrioritizationScheme", "Time").Trim().ToLower();
                    switch (update_prioritization_scheme)
                    {
                        case "time":
                            m_update_prioritization_scheme = UpdatePrioritizationSchemes.Time;
                            break;
                        case "distance":
                            m_update_prioritization_scheme = UpdatePrioritizationSchemes.Distance;
                            break;
                        case "simpleangulardistance":
                            m_update_prioritization_scheme = UpdatePrioritizationSchemes.SimpleAngularDistance;
                            break;
                        case "frontback":
                            m_update_prioritization_scheme = UpdatePrioritizationSchemes.FrontBack;
                            break;
                        default:
                            m_log.Warn("[SCENE]: UpdatePrioritizationScheme was not recognized, setting to default settomg of Time");
                            m_update_prioritization_scheme = UpdatePrioritizationSchemes.Time;
                            break;
                    }

                    m_reprioritization_enabled = interest_management_config.GetBoolean("ReprioritizationEnabled", true);
                    m_reprioritization_interval = interest_management_config.GetDouble("ReprioritizationInterval", 5000.0);
                    m_root_reprioritization_distance = interest_management_config.GetDouble("RootReprioritizationDistance", 10.0);
                    m_child_reprioritization_distance = interest_management_config.GetDouble("ChildReprioritizationDistance", 20.0);
                }

                m_log.Info("[SCENE]: Using the " + m_update_prioritization_scheme + " prioritization scheme");

                #region BinaryStats

                try
                {
                    IConfig statConfig = m_config.Configs["Statistics.Binary"];
                    if (statConfig.Contains("enabled") && statConfig.GetBoolean("enabled"))
                    {
                        if (statConfig.Contains("collect_region_stats"))
                        {
                            if (statConfig.GetBoolean("collect_region_stats"))
                            {
                                // if enabled, add us to the event. If not enabled, I won't get called
                                StatsReporter.OnSendStatsResult += LogSimStats;
                            }
                        }
                        if (statConfig.Contains("region_stats_period_seconds"))
                        {
                            m_statLogPeriod = TimeSpan.FromSeconds(statConfig.GetInt("region_stats_period_seconds"));
                        }
                        if (statConfig.Contains("stats_dir"))
                        {
                            m_statsDir = statConfig.GetString("stats_dir");
                        }
                    }
                }
                catch
                {
                    // if it doesn't work, we don't collect anything
                }

                #endregion BinaryStats
            }
            catch
            {
                m_log.Warn("[SCENE]: Failed to load StartupConfig");
            }
        }

        /// <summary>
        /// Mock constructor for scene group persistency unit tests.
        /// SceneObjectGroup RegionId property is delegated to Scene.
        /// </summary>
        /// <param name="regInfo"></param>
        public Scene(RegionInfo regInfo)
        {
            BordersLocked = true;
            Border northBorder = new Border();
            northBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, (int)Constants.RegionSize);  //<---
            northBorder.CrossDirection = Cardinals.N;
            NorthBorders.Add(northBorder);

            Border southBorder = new Border();
            southBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue,0);    //--->
            southBorder.CrossDirection = Cardinals.S;
            SouthBorders.Add(southBorder);

            Border eastBorder = new Border();
            eastBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue, (int)Constants.RegionSize);   //<---
            eastBorder.CrossDirection = Cardinals.E;
            EastBorders.Add(eastBorder);

            Border westBorder = new Border();
            westBorder.BorderLine = new Vector3(float.MinValue, float.MaxValue,0);     //--->
            westBorder.CrossDirection = Cardinals.W;
            WestBorders.Add(westBorder);
            BordersLocked = false;

            m_regInfo = regInfo;
            m_eventManager = new EventManager();

            m_lastUpdate = Util.EnvironmentTickCount();
        }

        #endregion

        #region Startup / Close Methods

        public bool ShuttingDown
        {
            get { return shuttingdown; }
        }

        /// <value>
        /// The scene graph for this scene
        /// </value>
        /// TODO: Possibly stop other classes being able to manipulate this directly.
        public SceneGraph SceneGraph
        {
            get { return m_sceneGraph; }
        }

        protected virtual void RegisterDefaultSceneEvents()
        {
            IDialogModule dm = RequestModuleInterface<IDialogModule>();

            if (dm != null)
                m_eventManager.OnPermissionError += dm.SendAlertToUser;
        }

        public override string GetSimulatorVersion()
        {
            return m_simulatorVersion;
        }

        /// <summary>
        /// Another region is up. 
        ///
        /// We only add it to the neighbor list if it's within 1 region from here.
        /// Agents may have draw distance values that cross two regions though, so
        /// we add it to the notify list regardless of distance. We'll check
        /// the agent's draw distance before notifying them though.
        /// </summary>
        /// <param name="otherRegion">RegionInfo handle for the new region.</param>
        /// <returns>True after all operations complete, throws exceptions otherwise.</returns>
        public override void OtherRegionUp(GridRegion otherRegion)
        {
            uint xcell = (uint)((int)otherRegion.RegionLocX / (int)Constants.RegionSize);
            uint ycell = (uint)((int)otherRegion.RegionLocY / (int)Constants.RegionSize);
            m_log.InfoFormat("[SCENE]: (on region {0}): Region {1} up in coords {2}-{3}", 
                RegionInfo.RegionName, otherRegion.RegionName, xcell, ycell);

            if (RegionInfo.RegionHandle != otherRegion.RegionHandle)
            {

                // If these are cast to INT because long + negative values + abs returns invalid data
                int resultX = Math.Abs((int)xcell - (int)RegionInfo.RegionLocX);
                int resultY = Math.Abs((int)ycell - (int)RegionInfo.RegionLocY);
                if (resultX <= 1 && resultY <= 1)
                {
                    // Let the grid service module know, so this can be cached
                    m_eventManager.TriggerOnRegionUp(otherRegion);

                    RegionInfo regInfo = new RegionInfo(xcell, ycell, otherRegion.InternalEndPoint, otherRegion.ExternalHostName);
                    regInfo.RegionID = otherRegion.RegionID;
                    regInfo.RegionName = otherRegion.RegionName;
                    regInfo.ScopeID = otherRegion.ScopeID;
                    regInfo.ExternalHostName = otherRegion.ExternalHostName;

                    try
                    {
                        ForEachScenePresence(delegate(ScenePresence agent)
                                             {
                                                 // If agent is a root agent.
                                                 if (!agent.IsChildAgent)
                                                 {
                                                     //agent.ControllingClient.new
                                                     //this.CommsManager.InterRegion.InformRegionOfChildAgent(otherRegion.RegionHandle, agent.ControllingClient.RequestClientInfo());

                                                     List<ulong> old = new List<ulong>();
                                                     old.Add(otherRegion.RegionHandle);
                                                     agent.DropOldNeighbours(old);
                                                     InformClientOfNeighbor(agent, regInfo);
                                                 }
                                             }
                            );
                    }
                    catch (NullReferenceException)
                    {
                        // This means that we're not booted up completely yet.
                        // This shouldn't happen too often anymore.
                        m_log.Error("[SCENE]: Couldn't inform client of regionup because we got a null reference exception");
                    }

                }
                else
                {
                    m_log.Info("[INTERGRID]: Got notice about far away Region: " + otherRegion.RegionName.ToString() +
                               " at  (" + otherRegion.RegionLocX.ToString() + ", " +
                               otherRegion.RegionLocY.ToString() + ")");
                }
            }
        }

        public void AddNeighborRegion(RegionInfo region)
        {
            lock (m_neighbours)
            {
                if (!CheckNeighborRegion(region))
                {
                    m_neighbours.Add(region);
                }
            }
        }

        public bool CheckNeighborRegion(RegionInfo region)
        {
            bool found = false;
            lock (m_neighbours)
            {
                foreach (RegionInfo reg in m_neighbours)
                {
                    if (reg.RegionHandle == region.RegionHandle)
                    {
                        found = true;
                        break;
                    }
                }
            }
            return found;
        }

        // Alias IncomingHelloNeighbour OtherRegionUp, for now
        public GridRegion IncomingHelloNeighbour(RegionInfo neighbour)
        {
            OtherRegionUp(new GridRegion(neighbour));
            return new GridRegion(RegionInfo);
        }

        /// <summary>
        /// Given float seconds, this will restart the region.
        /// </summary>
        /// <param name="seconds">float indicating duration before restart.</param>
        public virtual void Restart(float seconds)
        {
            // notifications are done in 15 second increments
            // so ..   if the number of seconds is less then 15 seconds, it's not really a restart request
            // It's a 'Cancel restart' request.

            // RestartNow() does immediate restarting.
            if (seconds < 15)
            {
                m_restartTimer.Stop();
                m_dialogModule.SendGeneralAlert("Restart Aborted");
            }
            else
            {
                // Now we figure out what to set the timer to that does the notifications and calls, RestartNow()
                m_restartTimer.Interval = 15000;
                m_incrementsof15seconds = (int)seconds / 15;
                m_RestartTimerCounter = 0;
                m_restartTimer.AutoReset = true;
                m_restartTimer.Elapsed += new ElapsedEventHandler(RestartTimer_Elapsed);
                m_log.Info("[REGION]: Restarting Region in " + (seconds / 60) + " minutes");
                m_restartTimer.Start();
                m_dialogModule.SendNotificationToUsersInRegion(
                    UUID.Random(), String.Empty, RegionInfo.RegionName + String.Format(": Restarting in {0} Minutes", (int)(seconds / 60.0)));
            }
        }

        // The Restart timer has occured.
        // We have to figure out if this is a notification or if the number of seconds specified in Restart
        // have elapsed.
        // If they have elapsed, call RestartNow()
        public void RestartTimer_Elapsed(object sender, ElapsedEventArgs e)
        {
            m_RestartTimerCounter++;
            if (m_RestartTimerCounter <= m_incrementsof15seconds)
            {
                if (m_RestartTimerCounter == 4 || m_RestartTimerCounter == 6 || m_RestartTimerCounter == 7)
                    m_dialogModule.SendNotificationToUsersInRegion(
                        UUID.Random(),
                        String.Empty,
                        RegionInfo.RegionName + ": Restarting in " + ((8 - m_RestartTimerCounter) * 15) + " seconds");
            }
            else
            {
                m_restartTimer.Stop();
                m_restartTimer.AutoReset = false;
                RestartNow();
            }
        }

        // This causes the region to restart immediatley.
        public void RestartNow()
        {
            IConfig startupConfig = m_config.Configs["Startup"];
            if (startupConfig != null)
            {
                if (startupConfig.GetBoolean("InworldRestartShutsDown", false))
                {
                    MainConsole.Instance.RunCommand("shutdown");
                    return;
                }
            }

            if (PhysicsScene != null)
            {
                PhysicsScene.Dispose();
            }

            m_log.Error("[REGION]: Closing");
            Close();

            m_log.Error("[REGION]: Firing Region Restart Message");
            base.Restart(0);
        }

        // This is a helper function that notifies root agents in this region that a new sim near them has come up
        // This is in the form of a timer because when an instance of OpenSim.exe is started,
        // Even though the sims initialize, they don't listen until 'all of the sims are initialized'
        // If we tell an agent about a sim that's not listening yet, the agent will not be able to connect to it.
        // subsequently the agent will never see the region come back online.
        public void RestartNotifyWaitElapsed(object sender, ElapsedEventArgs e)
        {
            m_restartWaitTimer.Stop();
            lock (m_regionRestartNotifyList)
            {
                foreach (RegionInfo region in m_regionRestartNotifyList)
                {
                    try
                    {
                        ForEachScenePresence(delegate(ScenePresence agent)
                                             {
                                                 // If agent is a root agent.
                                                 if (!agent.IsChildAgent)
                                                 {
                                                     //agent.ControllingClient.new
                                                     //this.CommsManager.InterRegion.InformRegionOfChildAgent(otherRegion.RegionHandle, agent.ControllingClient.RequestClientInfo());
                                                     InformClientOfNeighbor(agent, region);
                                                 }
                                             }
                            );
                    }
                    catch (NullReferenceException)
                    {
                        // This means that we're not booted up completely yet.
                        // This shouldn't happen too often anymore.
                    }
                }

                // Reset list to nothing.
                m_regionRestartNotifyList.Clear();
            }
        }

        public void SetSceneCoreDebug(bool ScriptEngine, bool CollisionEvents, bool PhysicsEngine)
        {
            if (m_scripts_enabled != !ScriptEngine)
            {
                // Tedd!   Here's the method to disable the scripting engine!
                if (ScriptEngine)
                {
                    m_log.Info("Stopping all Scripts in Scene");
                    foreach (EntityBase ent in Entities)
                    {
                        if (ent is SceneObjectGroup)
                        {
                            ((SceneObjectGroup) ent).RemoveScriptInstances(false);
                        }
                    }
                }
                else
                {
                    m_log.Info("Starting all Scripts in Scene");
                    lock (Entities)
                    {
                        foreach (EntityBase ent in Entities)
                        {
                            if (ent is SceneObjectGroup)
                            {
                                ((SceneObjectGroup)ent).CreateScriptInstances(0, false, DefaultScriptEngine, 0);
                            }
                        }
                    }
                }
                m_scripts_enabled = !ScriptEngine;
                m_log.Info("[TOTEDD]: Here is the method to trigger disabling of the scripting engine");
            }

            if (m_physics_enabled != !PhysicsEngine)
            {
                m_physics_enabled = !PhysicsEngine;
            }
        }

        public int GetInaccurateNeighborCount()
        {
            return m_neighbours.Count;
        }

        // This is the method that shuts down the scene.
        public override void Close()
        {
            m_log.InfoFormat("[SCENE]: Closing down the single simulator: {0}", RegionInfo.RegionName);

            m_restartTimer.Stop();
            m_restartTimer.Close();

            // Kick all ROOT agents with the message, 'The simulator is going down'
            ForEachScenePresence(delegate(ScenePresence avatar)
                                 {
                                     if (avatar.KnownChildRegionHandles.Contains(RegionInfo.RegionHandle))
                                         avatar.KnownChildRegionHandles.Remove(RegionInfo.RegionHandle);

                                     if (!avatar.IsChildAgent)
                                         avatar.ControllingClient.Kick("The simulator is going down.");

                                     avatar.ControllingClient.SendShutdownConnectionNotice();
                                 });

            // Wait here, or the kick messages won't actually get to the agents before the scene terminates.
            Thread.Sleep(500);

            // Stop all client threads.
            ForEachScenePresence(delegate(ScenePresence avatar) { avatar.ControllingClient.Close(); });

            // Stop updating the scene objects and agents.
            //m_heartbeatTimer.Close();
            shuttingdown = true;

            m_log.Debug("[SCENE]: Persisting changed objects");
            List<EntityBase> entities = GetEntities();
            foreach (EntityBase entity in entities)
            {
                if (!entity.IsDeleted && entity is SceneObjectGroup && ((SceneObjectGroup)entity).HasGroupChanged)
                {
                    ((SceneObjectGroup)entity).ProcessBackup(m_storageManager.DataStore, false);
                }
            }

            m_sceneGraph.Close();

            // De-register with region communications (events cleanup)
            UnRegisterRegionWithComms();

            // call the base class Close method.
            base.Close();
        }

        /// <summary>
        /// Start the timer which triggers regular scene updates
        /// </summary>
        public void StartTimer()
        {
            //m_log.Debug("[SCENE]: Starting timer");
            //m_heartbeatTimer.Enabled = true;
            //m_heartbeatTimer.Interval = (int)(m_timespan * 1000);
            //m_heartbeatTimer.Elapsed += new ElapsedEventHandler(Heartbeat);
            if (HeartbeatThread != null)
            {
                HeartbeatThread.Abort();
                HeartbeatThread = null;
            }
            m_lastUpdate = Util.EnvironmentTickCount();

            HeartbeatThread = Watchdog.StartThread(Heartbeat, "Heartbeat for region " + RegionInfo.RegionName, ThreadPriority.Normal, false);
        }

        /// <summary>
        /// Sets up references to modules required by the scene
        /// </summary>
        public void SetModuleInterfaces()
        {
            m_xmlrpcModule = RequestModuleInterface<IXMLRPC>();
            m_worldCommModule = RequestModuleInterface<IWorldComm>();
            XferManager = RequestModuleInterface<IXfer>();
            m_AvatarFactory = RequestModuleInterface<IAvatarFactory>();
            m_serialiser = RequestModuleInterface<IRegionSerialiserModule>();
            m_interregionCommsOut = RequestModuleInterface<IInterregionCommsOut>();
            m_interregionCommsIn = RequestModuleInterface<IInterregionCommsIn>();
            m_dialogModule = RequestModuleInterface<IDialogModule>();
            m_capsModule = RequestModuleInterface<ICapabilitiesModule>();
            m_teleportModule = RequestModuleInterface<ITeleportModule>();
        }

        #endregion

        #region Update Methods

        /// <summary>
        /// Performs per-frame updates regularly
        /// </summary>
        private void Heartbeat()
        {
            if (!Monitor.TryEnter(m_heartbeatLock))
            {
                Watchdog.RemoveThread();
                return;
            }

            try
            {
                Update();

                m_lastUpdate = Util.EnvironmentTickCount();
                m_firstHeartbeat = false;
            }
            catch (ThreadAbortException)
            {
            }
            finally
            {
                Monitor.Pulse(m_heartbeatLock);
                Monitor.Exit(m_heartbeatLock);
            }

            Watchdog.RemoveThread();
        }

        /// <summary>
        /// Performs per-frame updates on the scene, this should be the central scene loop
        /// </summary>
        public override void Update()
        {
            float physicsFPS;
            int maintc;

            while (!shuttingdown)
            {
                TimeSpan SinceLastFrame = DateTime.UtcNow - m_lastupdate;
                physicsFPS = 0f;

                maintc = Util.EnvironmentTickCount();
                int tmpFrameMS = maintc;
                tempOnRezMS = eventMS = backupMS = terrainMS = landMS = 0;

                // Increment the frame counter
                ++m_frame;

                try
                {
                    // Check if any objects have reached their targets
                    CheckAtTargets();

                    // Update SceneObjectGroups that have scheduled themselves for updates
                    // Objects queue their updates onto all scene presences
                    if (m_frame % m_update_objects == 0)
                        m_sceneGraph.UpdateObjectGroups();

                    // Run through all ScenePresences looking for updates
                    // Presence updates and queued object updates for each presence are sent to clients
                    if (m_frame % m_update_presences == 0)
                        m_sceneGraph.UpdatePresences();

                    int tmpPhysicsMS2 = Util.EnvironmentTickCount();
                    if ((m_frame % m_update_physics == 0) && m_physics_enabled)
                        m_sceneGraph.UpdatePreparePhysics();
                    physicsMS2 = Util.EnvironmentTickCountSubtract(tmpPhysicsMS2);

                    if (m_frame % m_update_entitymovement == 0)
                        m_sceneGraph.UpdateScenePresenceMovement();

                    int tmpPhysicsMS = Util.EnvironmentTickCount();
                    if (m_frame % m_update_physics == 0)
                …

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