From 512910a51f676499c2869726d4b5e06c8ba34728 Mon Sep 17 00:00:00 2001
From: Diva Canto <diva@metaverseink.com>
Date: Mon, 20 Feb 2012 10:58:07 -0800
Subject: [PATCH] More improvements on agent position updates: if the target
 sims fail, blacklist them for 2 min, so that we don't keep doing remote calls
 that fail.

---
 .../Scenes/SceneCommunicationService.cs       |  7 ++-----
 .../Simulation/SimulationServiceConnector.cs  | 20 +++++++++++++------
 2 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs b/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
index c04171b9c7..19c9745f4f 100644
--- a/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneCommunicationService.cs
@@ -140,7 +140,6 @@ namespace OpenSim.Region.Framework.Scenes
             icon.EndInvoke(iar);
         }
 
-        ExpiringCache<string, bool> _failedSims = new ExpiringCache<string, bool>();
         public void SendChildAgentDataUpdate(AgentPosition cAgentData, ScenePresence presence)
         {
             // This assumes that we know what our neighbors are.
@@ -158,15 +157,13 @@ namespace OpenSim.Region.Framework.Scenes
                         Utils.LongToUInts(regionHandle, out x, out y);
                         GridRegion dest = m_scene.GridService.GetRegionByPosition(UUID.Zero, (int)x, (int)y);
                         bool v = true;
-                        if (! simulatorList.Contains(dest.ServerURI) && !_failedSims.TryGetValue(dest.ServerURI, out v))
+                        if (! simulatorList.Contains(dest.ServerURI))
                         {
                             // we havent seen this simulator before, add it to the list
                             // and send it an update
                             simulatorList.Add(dest.ServerURI);
                             // Let move this to sync. Mono definitely does not like async networking.
-                            if (!m_scene.SimulationService.UpdateAgent(dest, cAgentData))
-                                // Also if it fails, get it out of the loop for a bit
-                                _failedSims.Add(dest.ServerURI, true, 120);
+                            m_scene.SimulationService.UpdateAgent(dest, cAgentData);
 
                             // Leaving this here as a reminder that we tried, and it sucks.
                             //SendChildAgentDataUpdateDelegate d = SendChildAgentDataUpdateAsync;
diff --git a/OpenSim/Services/Connectors/Simulation/SimulationServiceConnector.cs b/OpenSim/Services/Connectors/Simulation/SimulationServiceConnector.cs
index c45f456c65..c45e312a49 100644
--- a/OpenSim/Services/Connectors/Simulation/SimulationServiceConnector.cs
+++ b/OpenSim/Services/Connectors/Simulation/SimulationServiceConnector.cs
@@ -153,6 +153,7 @@ namespace OpenSim.Services.Connectors.Simulation
             return UpdateAgent(destination, (IAgentData)data, 200000); // yes, 200 seconds
         }
 
+        private ExpiringCache<string, bool> _failedSims = new ExpiringCache<string, bool>();
         /// <summary>
         /// Send updated position information about an agent in this region to a neighbor
         /// This operation may be called very frequently if an avatar is moving about in
@@ -160,6 +161,10 @@ namespace OpenSim.Services.Connectors.Simulation
         /// </summary>
         public bool UpdateAgent(GridRegion destination, AgentPosition data)
         {
+            bool v = true;
+            if (_failedSims.TryGetValue(destination.ServerURI, out v))
+                return false;
+
             // The basic idea of this code is that the first thread that needs to
             // send an update for a specific avatar becomes the worker for any subsequent
             // requests until there are no more outstanding requests. Further, only send the most
@@ -183,9 +188,10 @@ namespace OpenSim.Services.Connectors.Simulation
                 // Otherwise update the reference and start processing
                 m_updateAgentQueue[uri] = data;
             }
-            
+
             AgentPosition pos = null;
-            while (true)
+            bool success = true;
+            while (success)
             {
                 lock (m_updateAgentQueue)
                 {
@@ -205,11 +211,13 @@ namespace OpenSim.Services.Connectors.Simulation
                     }
                 }
 
-                UpdateAgent(destination, (IAgentData)pos, 10000);
+                success = UpdateAgent(destination, (IAgentData)pos, 10000);
             }
-
-            // unreachable
-//            return true;
+            // we get here iff success == false
+            // blacklist sim for 2 minutes
+            _failedSims.AddOrUpdate(destination.ServerURI, true, 120);
+            m_updateAgentQueue.Clear();
+            return false;
         }
 
         /// <summary>