private void SaveTileData(Tile tile, string filePath)
{
lock (_lockGuard)
{
if (CoreLibrary.HasData(tile.QuadKey))
{
return;
}
var filePathResolved = _pathResolver.Resolve(filePath);
var stylesheetPathResolved = _pathResolver.Resolve(tile.Stylesheet.Path);
Trace.Info(TraceCategory, String.Format("save tile data {0} from {1} using style: {2}",
tile, filePathResolved, stylesheetPathResolved));
string errorMsg = null;
CoreLibrary.AddToStore(MapStorageType.Persistent,
stylesheetPathResolved,
filePathResolved,
tile.QuadKey,
error => errorMsg = error);
if (errorMsg != null)
{
throw new MapDataException(String.Format(Strings.CannotAddDataToInMemoryStore, errorMsg));
}
}
}
/// <summary> Downloads map data for given tile. </summary>
private IObservable <Tile> CreateDownloadSequence(Tile tile)
{
// data exists in store
if (CoreLibrary.HasData(tile.QuadKey))
{
return(Observable.Return(tile));
}
// data exists in cache
var filePath = GetCacheFilePath(tile);
if (_fileSystemService.Exists(filePath))
{
var errorMsg = SaveTileDataInMemory(tile, filePath);
return(errorMsg == null
? Observable.Return(tile)
: Observable.Throw <Tile>(new MapDataException(Strings.CannotAddDataToInMemoryStore, errorMsg)));
}
// need to download from remote server
return(Observable.Create <Tile>(observer =>
{
double padding = 0.001;
BoundingBox query = tile.BoundingBox;
var queryString = String.Format(_mapDataServerQuery,
query.MinPoint.Latitude - padding, query.MinPoint.Longitude - padding,
query.MaxPoint.Latitude + padding, query.MaxPoint.Longitude + padding);
var uri = String.Format("{0}{1}", _mapDataServerUri, Uri.EscapeDataString(queryString));
Trace.Warn(TraceCategory, Strings.NoPresistentElementSourceFound, tile.QuadKey.ToString(), uri);
_networkService.GetAndGetBytes(uri)
.ObserveOn(Scheduler.ThreadPool)
.Subscribe(bytes =>
{
Trace.Debug(TraceCategory, "saving bytes: {0}", bytes.Length.ToString());
lock (_lockObj)
{
if (!_fileSystemService.Exists(filePath))
{
using (var stream = _fileSystemService.WriteStream(filePath))
stream.Write(bytes, 0, bytes.Length);
}
}
// try to add in memory store
var errorMsg = SaveTileDataInMemory(tile, filePath);
if (errorMsg != null)
{
observer.OnError(new MapDataException(String.Format(Strings.CannotAddDataToInMemoryStore, errorMsg)));
}
else
{
observer.OnNext(tile);
observer.OnCompleted();
}
});
return Disposable.Empty;
}));
}
private IObservable <string> CreateMapDataObservable(Tile tile)
{
if (CoreLibrary.HasData(tile.QuadKey))
{
return(Observable.Return(""));
}
if (OsmTileRange.Contains(tile.QuadKey.LevelOfDetail))
{
return(_osmMapDataProvider.Get(tile));
}
return(_mapzenMapDataProvider.Get(tile));
}
/// <inheritdoc />
public IObservable <Union <Element, Mesh> > Load(Tile tile)
{
return(_mapDataProvider
.Get(tile)
.SelectMany(filePath =>
{
if (!CoreLibrary.HasData(tile.QuadKey))
{
SaveTileData(tile, filePath);
}
return CreateLoadSequence(tile);
}));
}
/// <inheritdoc />
public override void OnNext(Tile value)
{
if (CoreLibrary.HasData(value.QuadKey))
{
Notify(new Tuple <Tile, string>(value, ""));
return;
}
if (OsmTileRange.Contains(value.QuadKey.LevelOfDetail))
{
_osmMapDataProvider.OnNext(value);
}
else
{
_mapzenMapDataProvider.OnNext(value);
}
}