From 18da917ddd7e456d83e4cbad561fc988014ffe12 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Mon, 19 Nov 2012 22:24:10 +0000
Subject: [PATCH] Bracket threshold.xml loading in a DB transaction.

Should mitigate (but not completely fix, yet) bad map performance when initially zooming out, or panning when zoomed out.
---
 src/Airports/simple.cxx | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/Airports/simple.cxx b/src/Airports/simple.cxx
index 98aaba6f9..9fff74dc9 100644
--- a/src/Airports/simple.cxx
+++ b/src/Airports/simple.cxx
@@ -391,11 +391,17 @@ void FGAirport::loadSceneryDefinitions() const
     return;
   }
   
-  SGPropertyNode_ptr rootNode = new SGPropertyNode;
-  readProperties(path.str(), rootNode);
-  const_cast<FGAirport*>(this)->readThresholdData(rootNode);
-  cache->stampCacheFile(path);
-
+  try {
+    cache->beginTransaction();
+    SGPropertyNode_ptr rootNode = new SGPropertyNode;
+    readProperties(path.str(), rootNode);
+    const_cast<FGAirport*>(this)->readThresholdData(rootNode);
+    cache->stampCacheFile(path);
+    cache->commitTransaction();
+  } catch (sg_exception& e) {
+    cache->abortTransaction();
+    throw e;
+  }
 }
 
 void FGAirport::readThresholdData(SGPropertyNode* aRoot)
-- 
2.39.5