From 202212bcbcb64ad1889025dedc34b48d0704de96 Mon Sep 17 00:00:00 2001
From: UbitUmarov
Date: Sat, 30 Jul 2016 03:13:23 +0100
Subject: add a regionInfoCache get by world 2D position

---
 .../ServiceConnectorsOut/Grid/RegionInfoCache.cs   | 63 +++++++++++++++++++++-
 .../Grid/RemoteGridServiceConnector.cs             | 24 ++++-----
 2 files changed, 71 insertions(+), 16 deletions(-)

diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionInfoCache.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionInfoCache.cs
index 4dc9033..8403362 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionInfoCache.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RegionInfoCache.cs
@@ -109,6 +109,21 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
             
             return null;
         }
+
+        public GridRegion Get(UUID scopeID, int x, int y, out bool inCache)
+        {
+            inCache = false;
+
+            GridRegion rinfo = null;
+            if (m_Cache.TryGetValue(scopeID, x, y, out rinfo))
+            {
+                inCache = true;
+                return rinfo;
+            }
+            
+            return null;
+        }
+
     }
 
 
@@ -222,8 +237,8 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
   
     public sealed class RegionsExpiringCache
     {
-        const double CACHE_PURGE_HZ = 60;
-        const int MAX_LOCK_WAIT = 5000; // milliseconds
+        const double CACHE_PURGE_HZ = 60; // seconds
+        const int MAX_LOCK_WAIT = 10000; // milliseconds
  
         /// <summary>For thread safety</summary>
         object syncRoot = new object();
@@ -463,6 +478,50 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
             return false;
         }
 
+        // gets a region that contains world position (x,y)
+        // hopefull will not take ages
+        public bool TryGetValue(UUID scope, int x, int y, out GridRegion value)
+        {
+            if (!Monitor.TryEnter(syncRoot, MAX_LOCK_WAIT))
+                throw new ApplicationException("Lock could not be acquired after " + MAX_LOCK_WAIT + "ms");
+            try
+            {
+                value = null;
+
+                if(timedStorage.Count == 0)
+                    return false;
+
+                foreach(KeyValuePair<RegionKey, GridRegion> kvp in timedStorage)
+                {
+                    if(kvp.Key.ScopeID != scope)
+                        continue;
+
+                    GridRegion r = kvp.Value;
+                    if(r == null) // ??
+                        continue;
+                    int test = r.RegionLocX;
+                    if(x < test)
+                        continue;
+                    test += r.RegionSizeX;
+                    if(x >= test)
+                        continue;
+                    test = r.RegionLocY;
+                    if(y < test)
+                        continue;
+                    test += r.RegionSizeY;
+                    if (y < test)
+                    {
+                        value = r;
+                        return true;
+                    }
+                 }
+            }
+            finally { Monitor.Exit(syncRoot); }
+
+            value = null;
+            return false;
+        }
+
         public bool Update(UUID scope, GridRegion region, double expirationSeconds)
         {
             if (!Monitor.TryEnter(syncRoot, MAX_LOCK_WAIT))
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RemoteGridServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RemoteGridServiceConnector.cs
index 9e27abe..1e1e8f8 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RemoteGridServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Grid/RemoteGridServiceConnector.cs
@@ -193,26 +193,18 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
         // The coordinates are world coords (meters), NOT region units.
         public GridRegion GetRegionByPosition(UUID scopeID, int x, int y)
         {
+            // try in cache by handler first
             ulong regionHandle = Util.RegionWorldLocToHandle((uint)x, (uint)y);
-            uint regionX = Util.WorldToRegionLoc((uint)x);
-            uint regionY = Util.WorldToRegionLoc((uint)y);
 
-/*      this is no longer valid      
-            // Sanity check
-            if ((Util.RegionToWorldLoc(regionX) != (uint)x) || (Util.RegionToWorldLoc(regionY) != (uint)y))
-            {
-                m_log.WarnFormat("[REMOTE GRID CONNECTOR]: GetRegionByPosition. Bad position requested: not the base of the region. Requested Pos=<{0},{1}>, Should Be=<{2},{3}>",
-                    x, y, Util.RegionToWorldLoc(regionX), Util.RegionToWorldLoc(regionY));
-            }
-*/
             bool inCache = false;
             GridRegion rinfo = m_RegionInfoCache.Get(scopeID, regionHandle, out inCache);
             if (inCache)
-            {
-//                m_log.DebugFormat("[REMOTE GRID CONNECTOR]: GetRegionByPosition. Found region {0} in cache. Pos=<{1},{2}>, RegionHandle={3}",
-//                    (rinfo == null) ? "<missing>" : rinfo.RegionName, regionX, regionY, (rinfo == null) ? regionHandle : rinfo.RegionHandle);
                 return rinfo;
-            }
+
+            // try in cache by slower position next
+            rinfo = m_RegionInfoCache.Get(scopeID, x, y, out inCache);
+            if (inCache)
+                return rinfo;
 
             rinfo = m_LocalGridService.GetRegionByPosition(scopeID, x, y);
             if (rinfo == null)
@@ -221,7 +213,11 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Grid
             m_RegionInfoCache.Cache(rinfo);
 
             if (rinfo == null)
+            {
+                uint regionX = Util.WorldToRegionLoc((uint)x);
+                uint regionY = Util.WorldToRegionLoc((uint)y);
                 m_log.WarnFormat("[REMOTE GRID CONNECTOR]: Requested region {0}-{1} not found", regionX, regionY);
+            }
             else
                 m_log.DebugFormat("[REMOTE GRID CONNECTOR]: GetRegionByPosition. Added region {0} to the cache. Pos=<{1},{2}>, RegionHandle={3}",
                     rinfo.RegionName, rinfo.RegionCoordX, rinfo.RegionCoordY, (rinfo == null) ? regionHandle : rinfo.RegionHandle);
-- 
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