/// <summary>
/// Gets the size of the image.
/// </summary>
/// <param name="keyName">Name of the key.</param>
/// <param name="imagePath">The image path.</param>
/// <returns>ImageSize.</returns>
private async Task <ImageSize> GetImageSize(string keyName, string imagePath)
{
// Now check the file system cache
var fullCachePath = ImageSizeCache.GetResourcePath(keyName, ".txt");
try
{
var result = File.ReadAllText(fullCachePath).Split('|').Select(i => double.Parse(i, UsCulture)).ToArray();
return(new ImageSize {
Width = result[0], Height = result[1]
});
}
catch (IOException)
{
// Cache file doesn't exist or is currently being written to
}
var semaphore = GetLock(fullCachePath);
await semaphore.WaitAsync().ConfigureAwait(false);
try
{
var result = File.ReadAllText(fullCachePath).Split('|').Select(i => double.Parse(i, UsCulture)).ToArray();
return(new ImageSize {
Width = result[0], Height = result[1]
});
}
catch (FileNotFoundException)
{
// Cache file doesn't exist no biggie
}
catch (DirectoryNotFoundException)
{
// Cache file doesn't exist no biggie
}
catch
{
semaphore.Release();
throw;
}
try
{
var size = await ImageHeader.GetDimensions(imagePath, _logger).ConfigureAwait(false);
var parentPath = Path.GetDirectoryName(fullCachePath);
if (!Directory.Exists(parentPath))
{
Directory.CreateDirectory(parentPath);
}
// Update the file system cache
File.WriteAllText(fullCachePath, size.Width.ToString(UsCulture) + @"|" + size.Height.ToString(UsCulture));
return(new ImageSize {
Width = size.Width, Height = size.Height
});
}
finally
{
semaphore.Release();
}
}