public async Task FlushAsync(bool flushToDisk)
{
if (ErrorInjector != null)
{
await ErrorInjector.FlushAsync(_file, flushToDisk);
}
// The flush API in FileStream is f****d up:
//
// * FileStream.Flush(flushToDisk) synchronously flushes to OS and then optionally synchronously
// flushes to disk.
// * FileStream.FlushAsync() synchronously flushes to OS and then asynchronously flushes to disk.
//
// To add insult to injury, when called without arguments, FileStream.Flush() doesn't flush to disk
// while FileStream.FlushAsync() does!
//
// Based on this API we implement ByteWriter.FlushAsync(flushToDisk) that synchronously flushes to OS
// and then optionally asynchronously flushes to disk. Not perfect but the best we can do.
if (flushToDisk)
{
await _file.FlushAsync();
}
else
{
_file.Flush(flushToDisk: false);
}
}
public async Task <int> ReadAsync(byte[] array, int offset, int count)
{
if (ErrorInjector != null)
{
await ErrorInjector.ReadAsync(_file, array, offset, count);
}
return(await _file.ReadAsync(array, offset, count));
}
public async Task WriteAsync(byte[] array, int offset, int count)
{
if (ErrorInjector != null)
{
await ErrorInjector?.WriteAsync(_file, array, offset, count);
}
await _file.WriteAsync(array, offset, count);
}
public void Seek(long position)
{
ErrorInjector?.Seek(_file, position);
if (position == _file.Position)
{
return;
}
if (_file.Seek(position, SeekOrigin.Begin) != position)
{
throw new IOException($"Cannot seek to {position}");
}
}