private void LocalFetchCompleted(object sender, FetchTileCompletedEventArgs e)
{
//todo remove object sender
try
{
if (e.Error == null && e.Cancelled == false && _isThreadRunning && e.Image != null)
{
var feature = new Feature
{
Geometry = new Raster(new MemoryStream(e.Image), e.TileInfo.Extent.ToBoundingBox())
};
_memoryCache.Add(e.TileInfo.Index, feature);
}
}
catch (Exception ex)
{
e.Error = ex;
}
finally
{
_threadCount--;
lock (_tilesInProgress)
{
if (_tilesInProgress.Contains(e.TileInfo.Index))
{
_tilesInProgress.Remove(e.TileInfo.Index);
}
}
_waitHandle.Set();
}
DataChanged?.Invoke(this, new DataChangedEventArgs(e.Error, e.Cancelled, e.TileInfo));
}
internal void OnFetchCompleted(FetchTileCompletedEventArgs e)
{
if (e.Error == null)
{
// Reenter levels below the current removed level.
int indexLevel;
if (int.TryParse(e.TileInfo.Index.Level, NumberStyles.Integer, CultureInfo.InvariantCulture, out indexLevel))
{
foreach (var removedLevel in Levels(_removedResolutions.Keys))
{
if (removedLevel <= indexLevel)
{
int temp;
_removedResolutions.TryRemove(removedLevel.ToString(CultureInfo.InvariantCulture), out temp);
}
}
}
}
else
{
var webError = e.Error as WebException;
if (webError != null)
{
var httpResponse = webError.Response as HttpWebResponse;
if (httpResponse != null)
{
if (httpResponse.StatusCode == HttpStatusCode.NotFound)
{
// Remove resolutions.
if (!_removedResolutions.ContainsKey(e.TileInfo.Index.Level))
{
_removedResolutions[e.TileInfo.Index.Level] = 1;
}
else
{
_removedResolutions[e.TileInfo.Index.Level] += 1;
}
lock (_lock)
{
_resolutions = null;
}
// Force reload.
if (ForceReload != null)
{
ForceReload(this, EventArgs.Empty);
}
}
}
}
}
}
private static Raster CreateTileGeometry(FetchTileCompletedEventArgs e)
{
// A TileSource may return an byte array that is null. This is currently only implemented
// for MbTilesTileSource. It is to indicate that the tile is not present in the source,
// although it should be given the tile schema. It does not mean the tile could not
// be accessed because of some temporary reason. In that case it will throw an exception.
// For Mapsui this is important because it will not try again and again to fetch it.
// Here we return the geometry as null so that it will be added to the tile cache.
// TileLayer.GetFeatureInView will have to return only the non null geometries.
if (e.Image == null)
{
return(null);
}
return(new Raster(new MemoryStream(e.Image), e.TileInfo.Extent.ToBoundingBox()));
}
private void LocalFetchCompleted(object sender, FetchTileCompletedEventArgs e)
{
//todo remove object sender
try
{
if (e.Error == null && e.Cancelled == false && isThreadRunning && e.Image != null)
{
var feature = new Feature()
{
Geometry = new Raster(new MemoryStream(e.Image), e.TileInfo.Extent.ToBoundingBox())
};
memoryCache.Add(e.TileInfo.Index, feature);
}
}
catch (Exception ex)
{
e.Error = ex;
}
finally
{
threadCount--;
lock (tilesInProgress)
{
if (tilesInProgress.Contains(e.TileInfo.Index))
tilesInProgress.Remove(e.TileInfo.Index);
}
waitHandle.Set();
}
if (DataChanged != null)
DataChanged(this, new DataChangedEventArgs(e.Error, e.Cancelled, e.TileInfo));
}
