/// <summary>
/// Loaded file from a cache to event arguments.
/// </summary>
/// <param name="fileName">File name.</param>
/// <param name="callback">Callback which should be called to return tile if it is available or null.</param>
public override void LoadAsync(string fileName, Action <byte[]> callback)
{
CacheRecord record = this.GetCacheRecord(fileName);
byte[] tile = null;
if (record == null)
{
ICacheRecordMetadata metaData = this.LoadFileMetadata(fileName);
if (metaData != null && metaData.Expires >= DateTime.Now)
{
Stream stream = this.OpenCacheStream(fileName);
if (stream.Length == 0)
{
stream.Dispose();
}
else
{
AsyncStreamOperations.LoadAsync(stream, callback);
return;
}
}
}
else
{
tile = record.TileBody;
}
callback(tile);
}
