From ad81b453b38b538d5b4c40a326decee2577e024e Mon Sep 17 00:00:00 2001
From: Diva Canto
Date: Mon, 5 Oct 2009 09:02:52 -0700
Subject: GetRegionByPosition: use the cache, Luke.

---
 .../ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs | 14 ++++++++++++++
 .../CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs   | 14 ++++++++++++++
 2 files changed, 28 insertions(+)

(limited to 'OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid')

diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
index 3ca4882..1c72488 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/LocalGridServiceConnector.cs
@@ -206,6 +206,20 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
 
         public GridRegion GetRegionByPosition(UUID scopeID, int x, int y)
         {
+            GridRegion region = null;
+
+            // First see if it's a neighbour, even if it isn't on this sim.
+            // Neighbour data is cached in memory, so this is fast
+            foreach (RegionCache rcache in m_LocalCache.Values)
+            {
+                region = rcache.GetRegionByPosition(x, y);
+                if (region != null)
+                {
+                    return region;
+                }
+            }
+
+            // Then try on this sim (may be a lookup in DB if this is using MySql).
             return m_GridService.GetRegionByPosition(scopeID, x, y);
         }
 
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
index 2b336bb..44e850b 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionCache.cs
@@ -29,10 +29,12 @@ using System;
 using System.Collections.Generic;
 using System.Reflection;
 
+using OpenSim.Framework;
 using OpenSim.Region.Framework.Scenes;
 using OpenSim.Services.Interfaces;
 using GridRegion = OpenSim.Services.Interfaces.GridRegion;
 
+using OpenMetaverse;
 using log4net;
 
 namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
@@ -75,5 +77,17 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
         {
             return new List<GridRegion>(m_neighbours.Values);
         }
+
+        public GridRegion GetRegionByPosition(int x, int y)
+        {
+            uint xsnap = (uint)(x / Constants.RegionSize) * Constants.RegionSize;
+            uint ysnap = (uint)(y / Constants.RegionSize) * Constants.RegionSize;
+            ulong handle = Utils.UIntsToLong(xsnap, ysnap);
+            
+            if (m_neighbours.ContainsKey(handle))
+                return m_neighbours[handle];
+            
+            return null;
+        }
     }
 }
-- 
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