/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.Diagnostics;
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.Framework.Monitoring;
using OpenSim.Services.Interfaces;
using OpenSim.Framework.Communications;
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;
using PermissionMask = OpenSim.Framework.PermissionMask;

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

    public partial class Scene : SceneBase
    {
        private const long DEFAULT_MIN_TIME_FOR_PERSISTENCE = 60L;
        private const long DEFAULT_MAX_TIME_FOR_PERSISTENCE = 600L;

        public delegate void SynchronizeSceneHandler(Scene scene);

        #region Fields

        public bool EmergencyMonitoring = false;

        /// <summary>
        /// Show debug information about animations.
        /// </summary>
        public bool DebugAnimations { get; set; }

        /// <summary>
        /// Show debug information about teleports.
        /// </summary>
        public bool DebugTeleporting { get; set; }

        /// <summary>
        /// Show debug information about the scene loop.
        /// </summary>
        public bool DebugUpdates { get; set; }

        /// <summary>
        /// If true then the scene is saved to persistent storage periodically, every m_update_backup frames and
        /// if objects meet required conditions (m_dontPersistBefore and m_dontPersistAfter).
        /// </summary>
        /// <remarks>
        /// Even if false, the scene will still be saved on clean shutdown.
        /// FIXME: Currently, setting this to false will mean that objects are not periodically returned from parcels.  
        /// This needs to be fixed.
        /// </remarks>
        public bool PeriodicBackup { get; set; }

        /// <summary>
        /// If false then the scene is never saved to persistence storage even if PeriodicBackup == true and even
        /// if the scene is being shut down for the final time.
        /// </summary>
        public bool UseBackup { get; set; }

        /// <summary>
        /// If false then physical objects are disabled, though collisions will continue as normal.
        /// </summary>
        public bool PhysicsEnabled { get; set; }

        /// <summary>
        /// If false then scripts are not enabled on the smiulator
        /// </summary>
        public bool ScriptsEnabled 
        { 
            get { return m_scripts_enabled; }
            set 
            {
                if (m_scripts_enabled != value)
                {
                    if (!value)
                    {
                        m_log.Info("Stopping all Scripts in Scene");

                        EntityBase[] entities = Entities.GetEntities();
                        foreach (EntityBase ent in entities)
                        {
                            if (ent is SceneObjectGroup)
                                ((SceneObjectGroup)ent).RemoveScriptInstances(false);
                        }
                    }
                    else
                    {
                        m_log.Info("Starting all Scripts in Scene");
    
                        EntityBase[] entities = Entities.GetEntities();
                        foreach (EntityBase ent in entities)
                        {
                            if (ent is SceneObjectGroup)
                            {
                                SceneObjectGroup sog = (SceneObjectGroup)ent;
                                sog.CreateScriptInstances(0, false, DefaultScriptEngine, 0);
                                sog.ResumeScripts();
                            }
                        }
                    }

                    m_scripts_enabled = value;
                }
            }
        }
        private bool m_scripts_enabled;

        public SynchronizeSceneHandler SynchronizeScene;

        /// <summary>
        /// Used to prevent simultaneous calls to code that adds and removes agents.
        /// </summary>
        private object m_removeClientLock = new object();

        /// <summary>
        /// Statistical information for this scene.
        /// </summary>
        public SimStatsReporter StatsReporter { get; private set; }

        /// <summary>
        /// Controls whether physics can be applied to prims.  Even if false, prims still have entries in a
        /// PhysicsScene in order to perform collision detection
        /// </summary>
        public bool PhysicalPrims { get; private set; }

        /// <summary>
        /// Controls whether prims can be collided with.
        /// </summary>
        /// <remarks>
        /// If this is set to false then prims cannot be subject to physics either.
        /// </summary>
        public bool CollidablePrims { get; private set; }

        /// <summary>
        /// Minimum value of the size of a non-physical prim in each axis
        /// </summary>
        public float m_minNonphys = 0.001f;

        /// <summary>
        /// Maximum value of the size of a non-physical prim in each axis
        /// </summary>
        public float m_maxNonphys = 256;

        /// <summary>
        /// Minimum value of the size of a physical prim in each axis
        /// </summary>
        public float m_minPhys = 0.01f;

        /// <summary>
        /// Maximum value of the size of a physical prim in each axis
        /// </summary>
        public float m_maxPhys = 10;

        /// <summary>
        /// Max prims an object will hold
        /// </summary>
        public int m_linksetCapacity = 0;

        public bool m_clampPrimSize;
        public bool m_trustBinaries;
        public bool m_allowScriptCrossings;
        public bool m_useFlySlow;
        public bool m_useTrashOnDelete = true;

        /// <summary>
        /// Temporarily setting to trigger appearance resends at 60 second intervals.
        /// </summary>
        public bool SendPeriodicAppearanceUpdates { get; set; }

        protected float m_defaultDrawDistance = 255.0f;
        public float DefaultDrawDistance 
        {
            // get { return m_defaultDrawDistance; }
            get {
                if (RegionInfo != null)
                {
                    float largestDimension = Math.Max(RegionInfo.RegionSizeX, RegionInfo.RegionSizeY);
                    m_defaultDrawDistance = Math.Max(m_defaultDrawDistance, largestDimension);

                }
                return m_defaultDrawDistance;
            }
        }

        private List<string> m_AllowedViewers = new List<string>();
        private List<string> m_BannedViewers = new List<string>();
        
        // 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 { get; set; }

        public bool SeeIntoRegion { get; set; }

        // Using this for RegionReady module to prevent LoginsDisabled from changing under our feet;
        public bool LoginLock = false;

        public bool StartDisabled = false;
        public bool LoadingPrims;
        public IXfer XferManager;

        // 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;

        protected int m_splitRegionID;
        protected Timer m_restartWaitTimer = new Timer();
        protected List<RegionInfo> m_regionRestartNotifyList = new List<RegionInfo>();
        protected List<RegionInfo> m_neighbours = new List<RegionInfo>();
        protected string m_simulatorVersion = "OpenSimulator Server";
        protected AgentCircuitManager m_authenticateHandler;
        protected SceneCommunicationService m_sceneGridService;

        protected ISimulationDataService m_SimulationDataService;
        protected IEstateDataService m_EstateDataService;
        protected IAssetService m_AssetService;
        protected IAuthorizationService m_AuthorizationService;
        protected IInventoryService m_InventoryService;
        protected IGridService m_GridService;
        protected ILibraryService m_LibraryService;
        protected ISimulationService m_simulationService;
        protected IAuthenticationService m_AuthenticationService;
        protected IPresenceService m_PresenceService;
        protected IUserAccountService m_UserAccountService;
        protected IAvatarService m_AvatarService;
        protected IGridUserService m_GridUserService;

        protected IXMLRPC m_xmlrpcModule;
        protected IWorldComm m_worldCommModule;
        protected IAvatarFactoryModule m_AvatarFactory;
        protected IConfigSource m_config;
        protected IRegionSerialiserModule m_serialiser;
        protected IDialogModule m_dialogModule;
        protected ICapabilitiesModule m_capsModule;
        protected IGroupsModule m_groupsModule;

        private Dictionary<string, string> m_extraSettings;

        /// <summary>
        /// Current scene frame number
        /// </summary>
        public uint Frame
        {
            get;
            protected set;
        }

        /// <summary>
        /// Current maintenance run number
        /// </summary>
        public uint MaintenanceRun { get; private set; }

        /// <summary>
        /// The minimum length of time in seconds that will be taken for a scene frame.  If the frame takes less time then we
        /// will sleep for the remaining period.
        /// </summary>
        /// <remarks>
        /// One can tweak this number to experiment.  One current effect of reducing it is to make avatar animations
        /// occur too quickly (viewer 1) or with even more slide (viewer 2).
        /// </remarks>
        public float MinFrameTime { get; private set; }

        /// <summary>
        /// The minimum length of time in seconds that will be taken for a maintenance run.
        /// </summary>
        public float MinMaintenanceTime { get; private set; }

        private int m_update_physics = 1;
        private int m_update_entitymovement = 1;
        private int m_update_objects = 1;
        private int m_update_temp_cleaning = 1000;
        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 m_update_coarse_locations = 50;

        private int agentMS;
        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 spareMS;

        /// <summary>
        /// Tick at which the last frame was processed.
        /// </summary>
        private int m_lastFrameTick;

        /// <summary>
        /// Tick at which the last maintenance run occurred.
        /// </summary>
        private int m_lastMaintenanceTick;

        /// <summary>
        /// Signals whether temporary objects are currently being cleaned up.  Needed because this is launched
        /// asynchronously from the update loop.
        /// </summary>
        private bool m_cleaningTemps = false;

//        private Object m_heartbeatLock = new Object();

        // TODO: Possibly stop other classes being able to manipulate this directly.
        private SceneGraph m_sceneGraph;
        private readonly Timer m_restartTimer = new Timer(15000); // Wait before firing
        private volatile bool m_backingup;
        private Dictionary<UUID, ReturnInfo> m_returns = new Dictionary<UUID, ReturnInfo>();
        private Dictionary<UUID, SceneObjectGroup> m_groupsWithTargets = new Dictionary<UUID, SceneObjectGroup>();

        private string m_defaultScriptEngine;

        /// <summary>
        /// Tick at which the last login occurred.
        /// </summary>
        private int m_LastLogin;

        /// <summary>
        /// Thread that runs the scene loop.
        /// </summary>
        private Thread m_heartbeatThread;

        /// <summary>
        /// True if these scene is in the process of shutting down or is shutdown.
        /// </summary>
        public bool ShuttingDown
        {
            get { return m_shuttingDown; }
        }
        private volatile bool m_shuttingDown;

        /// <summary>
        /// Is the scene active?
        /// </summary>
        /// <remarks>
        /// If false, maintenance and update loops are not being run.  Updates can still be triggered manually if
        /// the scene is not active.
        /// </remarks>
        public bool Active
        {
            get { return m_active; }
            set
            {
                if (value)
                {
                    if (!m_active)
                        Start(false);
                }
                else
                {
                    // This appears assymetric with Start() above but is not - setting m_active = false stops the loops
                    // XXX: Possibly this should be in an explicit Stop() method for symmetry.
                    m_active = false;
                }
            }
        }
        private volatile bool m_active;

//        private int m_lastUpdate;
//        private bool m_firstHeartbeat = true;
        
        private UpdatePrioritizationSchemes m_priorityScheme = UpdatePrioritizationSchemes.Time;
        private bool m_reprioritizationEnabled = true;
        private double m_reprioritizationInterval = 5000.0;
        private double m_rootReprioritizationDistance = 10.0;
        private double m_childReprioritizationDistance = 20.0;

        private Timer m_mapGenerationTimer = new Timer();
        private bool m_generateMaptiles;

        #endregion Fields

        #region Properties

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

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

        public SceneCommunicationService SceneGridService
        {
            get { return m_sceneGridService; }
        }

        public ISimulationDataService SimulationDataService
        {
            get
            {
                if (m_SimulationDataService == null)
                {
                    m_SimulationDataService = RequestModuleInterface<ISimulationDataService>();

                    if (m_SimulationDataService == null)
                    {
                        throw new Exception("No ISimulationDataService available.");
                    }
                }

                return m_SimulationDataService;
            }
        }

        public IEstateDataService EstateDataService
        {
            get
            {
                if (m_EstateDataService == null)
                {
                    m_EstateDataService = RequestModuleInterface<IEstateDataService>();

                    if (m_EstateDataService == null)
                    {
                        throw new Exception("No IEstateDataService available.");
                    }
                }

                return m_EstateDataService;
            }
        }

        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;
            }
        }

        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;
            }
        }

        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;
            }
        }

        public ILibraryService LibraryService
        {
            get
            {
                if (m_LibraryService == null)
                    m_LibraryService = RequestModuleInterface<ILibraryService>();

                return m_LibraryService;
            }
        }

        public ISimulationService SimulationService
        {
            get
            {
                if (m_simulationService == null)
                    m_simulationService = RequestModuleInterface<ISimulationService>();

                return m_simulationService;
            }
        }

        public IAuthenticationService AuthenticationService
        {
            get
            {
                if (m_AuthenticationService == null)
                    m_AuthenticationService = RequestModuleInterface<IAuthenticationService>();
                return m_AuthenticationService;
            }
        }

        public IPresenceService PresenceService
        {
            get
            {
                if (m_PresenceService == null)
                    m_PresenceService = RequestModuleInterface<IPresenceService>();
                return m_PresenceService;
            }
        }

        public IUserAccountService UserAccountService
        {
            get
            {
                if (m_UserAccountService == null)
                    m_UserAccountService = RequestModuleInterface<IUserAccountService>();
                return m_UserAccountService;
            }
        }

        public IAvatarService AvatarService
        {
            get
            {
                if (m_AvatarService == null)
                    m_AvatarService = RequestModuleInterface<IAvatarService>();
                return m_AvatarService;
            }
        }

        public IGridUserService GridUserService
        {
            get
            {
                if (m_GridUserService == null)
                    m_GridUserService = RequestModuleInterface<IGridUserService>();
                return m_GridUserService;
            }
        }

        public IAttachmentsModule AttachmentsModule { get; set; }
        public IEntityTransferModule EntityTransferModule { get; private set; }
        public IAgentAssetTransactions AgentTransactionsModule { get; private set; }
        public IUserManagement UserManagementModule { get; private set; }

        public IAvatarFactoryModule AvatarFactory
        {
            get { return m_AvatarFactory; }
        }
        
        public ICapabilitiesModule CapsModule
        {
            get { return m_capsModule; }
        }

        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 m_lastFrameTick; } }

        public UpdatePrioritizationSchemes UpdatePrioritizationScheme { get { return m_priorityScheme; } }
        public bool IsReprioritizationEnabled { get { return m_reprioritizationEnabled; } }
        public double ReprioritizationInterval { get { return m_reprioritizationInterval; } }
        public double RootReprioritizationDistance { get { return m_rootReprioritizationDistance; } }
        public double ChildReprioritizationDistance { get { return m_childReprioritizationDistance; } }

        public AgentCircuitManager AuthenticateHandler
        {
            get { return m_authenticateHandler; }
        }

        // 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;
                }
            }
        }

        public string DefaultScriptEngine
        {
            get { return m_defaultScriptEngine; }
        }

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

        
        // used in sequence see: SpawnPoint()
        private int m_SpawnPoint;
        // can be closest/random/sequence
        public string SpawnPointRouting
        {
            get; private set;
        }
        // allow landmarks to pass
        public bool TelehubAllowLandmarks
        {
            get; private set;
        }

        #endregion Properties

        #region Constructors

        public Scene(RegionInfo regInfo, AgentCircuitManager authen,
                     SceneCommunicationService sceneGridService,
                     ISimulationDataService simDataService, IEstateDataService estateDataService,
                     IConfigSource config, string simulatorVersion)
            : this(regInfo)
        {
            m_config = config;
            MinFrameTime = 0.089f;
            MinMaintenanceTime = 1;
            SeeIntoRegion = true;

            Random random = new Random();

            m_lastAllocatedLocalId = (uint)(random.NextDouble() * (double)(uint.MaxValue / 2)) + (uint)(uint.MaxValue / 4);
            m_authenticateHandler = authen;
            m_sceneGridService = sceneGridService;
            m_SimulationDataService = simDataService;
            m_EstateDataService = estateDataService;
            m_regionHandle = RegionInfo.RegionHandle;

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

            m_asyncInventorySender = new AsyncInventorySender(this);

            #region Region Settings

            // Load region settings
            // LoadRegionSettings creates new region settings in persistence if they don't already exist for this region.
            // However, in this case, the default textures are not set in memory properly, so we need to do it here and
            // resave.
            // FIXME: It shouldn't be up to the database plugins to create this data - we should do it when a new
            // region is set up and avoid these gyrations.
            RegionSettings rs = simDataService.LoadRegionSettings(RegionInfo.RegionID);
            m_extraSettings = simDataService.GetExtra(RegionInfo.RegionID);

            bool updatedTerrainTextures = false;
            if (rs.TerrainTexture1 == UUID.Zero)
            {
                rs.TerrainTexture1 = RegionSettings.DEFAULT_TERRAIN_TEXTURE_1;
                updatedTerrainTextures = true;
            }

            if (rs.TerrainTexture2 == UUID.Zero)
            {
                rs.TerrainTexture2 = RegionSettings.DEFAULT_TERRAIN_TEXTURE_2;
                updatedTerrainTextures = true;
            }

            if (rs.TerrainTexture3 == UUID.Zero)
            {
                rs.TerrainTexture3 = RegionSettings.DEFAULT_TERRAIN_TEXTURE_3;
                updatedTerrainTextures = true;
            }

            if (rs.TerrainTexture4 == UUID.Zero)
            {
                rs.TerrainTexture4 = RegionSettings.DEFAULT_TERRAIN_TEXTURE_4;
                updatedTerrainTextures = true;
            }

            if (updatedTerrainTextures)
                rs.Save();

            RegionInfo.RegionSettings = rs;

            if (estateDataService != null)
                RegionInfo.EstateSettings = estateDataService.LoadEstateSettings(RegionInfo.RegionID, false);

            #endregion Region Settings

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

            m_sceneGraph = new SceneGraph(this);

            // 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 
                += () => 
                    { 
                        m_log.ErrorFormat("[SCENE]: Restarting region {0} due to unrecoverable physics crash", Name); 
                        RestartNow(); 
                    };

            RegisterDefaultSceneEvents();

            // XXX: Don't set the public property since we don't want to activate here.  This needs to be handled 
            // better in the future.
            m_scripts_enabled = !RegionInfo.RegionSettings.DisableScripts;

            PhysicsEnabled = !RegionInfo.RegionSettings.DisablePhysics;

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

            #region Region Config

            // Region config overrides global config
            //
            if (m_config.Configs["Startup"] != null)
            {
                IConfig startupConfig = m_config.Configs["Startup"];

                StartDisabled = startupConfig.GetBoolean("StartDisabled", false);

                m_defaultDrawDistance = startupConfig.GetFloat("DefaultDrawDistance", m_defaultDrawDistance);
                UseBackup = startupConfig.GetBoolean("UseSceneBackup", UseBackup);
                if (!UseBackup)
                    m_log.InfoFormat("[SCENE]: Backup has been disabled for {0}", RegionInfo.RegionName);
                
                //Animation states
                m_useFlySlow = startupConfig.GetBoolean("enableflyslow", false);

                SeeIntoRegion = startupConfig.GetBoolean("see_into_region", SeeIntoRegion);

                MaxUndoCount = startupConfig.GetInt("MaxPrimUndos", 20);

                PhysicalPrims = startupConfig.GetBoolean("physical_prim", PhysicalPrims);
                CollidablePrims = startupConfig.GetBoolean("collidable_prim", CollidablePrims);

                m_minNonphys = startupConfig.GetFloat("NonPhysicalPrimMin", m_minNonphys);
                if (RegionInfo.NonphysPrimMin > 0)
                {
                    m_minNonphys = RegionInfo.NonphysPrimMin;
                }

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

                m_minPhys = startupConfig.GetFloat("PhysicalPrimMin", m_minPhys);
                if (RegionInfo.PhysPrimMin > 0)
                {
                    m_minPhys = RegionInfo.PhysPrimMin;
                }

                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_linksetCapacity = startupConfig.GetInt("LinksetPrims", m_linksetCapacity);
                if (RegionInfo.LinksetCapacity > 0)
                {
                    m_linksetCapacity = RegionInfo.LinksetCapacity;
                }

                m_useTrashOnDelete = startupConfig.GetBoolean("UseTrashOnDelete", m_useTrashOnDelete);
                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");

                SpawnPointRouting = startupConfig.GetString("SpawnPointRouting", "closest");
                TelehubAllowLandmarks = startupConfig.GetBoolean("TelehubAllowLandmark", false);

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

                string[] possibleMapConfigSections = new string[] { "Map", "Startup" };

                m_generateMaptiles 
                    = Util.GetConfigVarFromSections<bool>(config, "GenerateMaptiles", possibleMapConfigSections, true);

                if (m_generateMaptiles)
                {
                    int maptileRefresh = Util.GetConfigVarFromSections<int>(config, "MaptileRefresh", possibleMapConfigSections, 0);
                    m_log.InfoFormat("[SCENE]: Region {0}, WORLD MAP refresh time set to {1} seconds", RegionInfo.RegionName, maptileRefresh);
                    if (maptileRefresh != 0)
                    {
                        m_mapGenerationTimer.Interval = maptileRefresh * 1000;
                        m_mapGenerationTimer.Elapsed += RegenerateMaptileAndReregister;
                        m_mapGenerationTimer.AutoReset = true;
                        m_mapGenerationTimer.Start();
                    }
                }
                else
                {
                    string tile 
                        = Util.GetConfigVarFromSections<string>(
                            config, "MaptileStaticUUID", possibleMapConfigSections, UUID.Zero.ToString());

                    UUID tileID;

                    if (tile != UUID.Zero.ToString() && UUID.TryParse(tile, out tileID))
                    {
                        RegionInfo.RegionSettings.TerrainImageID = tileID;
                    }
                    else
                    {
                        RegionInfo.RegionSettings.TerrainImageID = RegionInfo.MaptileStaticUUID;
                        m_log.InfoFormat("[SCENE]: Region {0}, maptile set to {1}", RegionInfo.RegionName, RegionInfo.MaptileStaticUUID.ToString());
                    }
                }

                string[] possibleAccessControlConfigSections = new string[] { "AccessControl", "Startup" };

                string grant 
                    = Util.GetConfigVarFromSections<string>(
                        config, "AllowedClients", possibleAccessControlConfigSections, "");

                if (grant.Length > 0)
                {
                    foreach (string viewer in grant.Split('|'))
                    {
                        m_AllowedViewers.Add(viewer.Trim().ToLower());
                    }
                }

                grant 
                    = Util.GetConfigVarFromSections<string>(
                        config, "BannedClients", possibleAccessControlConfigSections, "");

                if (grant.Length > 0)
                {
                    foreach (string viewer in grant.Split('|'))
                    {
                        m_BannedViewers.Add(viewer.Trim().ToLower());
                    }
                }

                MinFrameTime              = startupConfig.GetFloat( "MinFrameTime",                      MinFrameTime);
                m_update_backup           = startupConfig.GetInt(   "UpdateStorageEveryNFrames",         m_update_backup);
                m_update_coarse_locations = startupConfig.GetInt(   "UpdateCoarseLocationsEveryNFrames", m_update_coarse_locations);
                m_update_entitymovement   = startupConfig.GetInt(   "UpdateEntityMovementEveryNFrames",  m_update_entitymovement);
                m_update_events           = startupConfig.GetInt(   "UpdateEventsEveryNFrames",          m_update_events);
                m_update_objects          = startupConfig.GetInt(   "UpdateObjectsEveryNFrames",         m_update_objects);
                m_update_physics          = startupConfig.GetInt(   "UpdatePhysicsEveryNFrames",         m_update_physics);
                m_update_presences        = startupConfig.GetInt(   "UpdateAgentsEveryNFrames",          m_update_presences);
                m_update_terrain          = startupConfig.GetInt(   "UpdateTerrainEveryNFrames",         m_update_terrain);
                m_update_temp_cleaning    = startupConfig.GetInt(   "UpdateTempCleaningEveryNFrames",    m_update_temp_cleaning);
            }

            // FIXME: Ultimately this should be in a module.
            SendPeriodicAppearanceUpdates = true;
            
            IConfig appearanceConfig = m_config.Configs["Appearance"];
            if (appearanceConfig != null)
            {
                SendPeriodicAppearanceUpdates
                    = appearanceConfig.GetBoolean("ResendAppearanceUpdates", SendPeriodicAppearanceUpdates);
            }

            #endregion Region Config

            #region Interest Management

            IConfig interestConfig = m_config.Configs["InterestManagement"];
            if (interestConfig != null)
            {
                string update_prioritization_scheme = interestConfig.GetString("UpdatePrioritizationScheme", "Time").Trim().ToLower();

                try
                {
                    m_priorityScheme = (UpdatePrioritizationSchemes)Enum.Parse(typeof(UpdatePrioritizationSchemes), update_prioritization_scheme, true);
                }
                catch (Exception)
                {
                    m_log.Warn("[PRIORITIZER]: UpdatePrioritizationScheme was not recognized, setting to default prioritizer Time");
                    m_priorityScheme = UpdatePrioritizationSchemes.Time;
                }

                m_reprioritizationEnabled = interestConfig.GetBoolean("ReprioritizationEnabled", true);
                m_reprioritizationInterval = interestConfig.GetDouble("ReprioritizationInterval", 5000.0);
                m_rootReprioritizationDistance = interestConfig.GetDouble("RootReprioritizationDistance", 10.0);
                m_childReprioritizationDistance = interestConfig.GetDouble("ChildReprioritizationDistance", 20.0);
            }

            m_log.DebugFormat("[SCENE]: Using the {0} prioritization scheme", m_priorityScheme);

            #endregion Interest Management

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

        public Scene(RegionInfo regInfo) : base(regInfo)
        {
            PhysicalPrims = true;
            CollidablePrims = true;
            PhysicsEnabled = true;

            PeriodicBackup = true;
            UseBackup = true;

            m_eventManager = new EventManager();

            m_permissions = new ScenePermissions(this);
        }

        #endregion

        #region Startup / Close Methods

        /// <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;

            m_eventManager.OnSignificantClientMovement += HandleOnSignificantClientMovement;
        }

        public override string GetSimulatorVersion()
        {
            return m_simulatorVersion;
        }

        /// <summary>
        /// Process the fact that a neighbouring region has come up.
        /// </summary>
        /// <remarks>
        /// 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.
        /// </remarks>
        /// <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 = Util.WorldToRegionLoc((uint)otherRegion.RegionLocX);
            uint ycell = Util.WorldToRegionLoc((uint)otherRegion.RegionLocY);

            //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);

                    try
                    {
                        ForEachRootScenePresence(delegate(ScenePresence agent)
                        {
                            //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);
                            if (EntityTransferModule != null && agent.PresenceType != PresenceType.Npc)
                                EntityTransferModule.EnableChildAgent(agent, otherRegion);
                        });
                    }
                    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.InfoFormat(
                        "[SCENE]: Got notice about far away Region: {0} at ({1}, {2})",
                        otherRegion.RegionName, otherRegion.RegionLocX, otherRegion.RegionLocY);
                }
            }
        }

        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);
        }

        // 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;
                }
            }

            m_log.InfoFormat("[REGION]: Restarting region {0}", Name);

            Close();

            base.Restart();
        }

        // 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)
                {
                    GridRegion r = new GridRegion(region);
                    try
                    {
                        ForEachRootScenePresence(delegate(ScenePresence agent)
                        {
                            if (EntityTransferModule != null && agent.PresenceType != PresenceType.Npc)
                                EntityTransferModule.EnableChildAgent(agent, r);
                        });
                    }
                    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 int GetInaccurateNeighborCount()
        {
            return m_neighbours.Count;
        }

        // This is the method that shuts down the scene.
        public override void Close()
        {
            if (m_shuttingDown)
            {
                m_log.WarnFormat("[SCENE]: Ignoring close request because already closing {0}", Name);
                return;
            }

            m_log.InfoFormat("[SCENE]: Closing down the single simulator: {0}", RegionInfo.RegionName);

            StatsReporter.Close();

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

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

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

                                     avatar.ControllingClient.SendShutdownConnectionNotice();
                                 });

            // Stop updating the scene objects and agents.
            m_shuttingDown = true;

            // Wait here, or the kick messages won't actually get to the agents before the scene terminates.
            // We also need to wait to avoid a race condition with the scene update loop which might not yet
            // have checked ShuttingDown.
            Thread.Sleep(500);

            // Stop all client threads.
            ForEachScenePresence(delegate(ScenePresence avatar) { CloseAgent(avatar.UUID, false); });

            m_log.Debug("[SCENE]: Persisting changed objects");
            EventManager.TriggerSceneShuttingDown(this);
            Backup(false);
            m_sceneGraph.Close();

            i…

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