public static void PurgeLRU()
{
if (tiles.Count < maxReadyToRenderSize)
{
return;
}
List <Tile> notReadyCullList = new List <Tile>();
List <Tile> readyCullList = new List <Tile>();
try
{
try
{
foreach (string key in tiles.Keys)
{
Tile tile = tiles[key];
if (tile.RenderedGeneration < (Tile.CurrentRenderGeneration - 10) && !(tile.RequestPending || tile.Downloading))
{
if (tile.ReadyToRender)
{
readyCullList.Add(tile);
}
else
{
notReadyCullList.Add(tile);
}
}
}
}
catch
{
}
readyToRenderCount = readyCullList.Count;
if (readyCullList.Count > maxReadyToRenderSize)
{
readyCullList.Sort(delegate(Tile t1, Tile t2)
{
return(t2.AccessCount < t1.AccessCount ? 1 : (t2.AccessCount == t1.AccessCount ? 0 : -1));
}
);
int totalToPurge = readyCullList.Count - maxReadyToRenderSize;
foreach (Tile tile in readyCullList)
{
if (totalToPurge < 1)
{
break;
}
tile.CleanUp(false);
//tile.CleanUp(true);
//tiles.Remove(tile.Key);
totalToPurge--;
}
}
if (tiles.Count < maxTileCacheSize)
{
return;
}
if (notReadyCullList.Count > maxTileCacheSize)
{
notReadyCullList.Sort(delegate(Tile t1, Tile t2)
{
return(t2.AccessCount < t1.AccessCount ? 1 : (t2.AccessCount == t1.AccessCount ? 0 : -1));
}
);
int totalToPurge = notReadyCullList.Count - maxTileCacheSize;
if (totalToPurge > 20)
{
totalToPurge = 20;
}
foreach (Tile tile in notReadyCullList)
{
if (totalToPurge < 1)
{
break;
}
tile.CleanUp(true);
tiles.Remove(tile.Key);
totalToPurge--;
}
}
}
catch
{
}
finally
{
}
return;
}
