public void WriteWasSuccessful()
{
//get it onto the same volume for sure
string pending = _realFilePath + ".pending";
if (RobustFile.Exists(pending))
{
RobustFile.Delete(pending);
}
RobustFile.Move(_tempPath, pending); //NB: Replace() is tempting but fails across volumes
if (RobustFile.Exists(_realFilePath))
{
SafeReplace(pending, _realFilePath, _realFilePath + ".bak");
}
else
{
RobustFile.Move(pending, _realFilePath);
}
}
private void SafeReplace(string sourceFilePath, string destinationFilePath, string backupFilePath)
{
try
{
if (SimulateVolumeThatCannotHandleFileReplace)
{
throw new IOException("dummy");
}
if (RobustFile.Exists(destinationFilePath))
{
//this one *might* be atomic, though no guarantees, apparently
RobustFile.Replace(sourceFilePath, destinationFilePath, backupFilePath);
}
else // I think it's confusing to find empty ".bak" files, we don't mention the bak file if the original is missing
{
// "Pass null to the destinationBackupFileName parameter if you do not want to create a backup of the file being replaced."
RobustFile.Replace(sourceFilePath, destinationFilePath, null);
}
}
//NB: UnauthorizedAccessException, which we get in BL-322, is not a subclass of IOException
catch (Exception error)
{
Logger.WriteMinorEvent("TempFileForSafeWriting got " + error.Message + " Will use fall back method.");
// This one for where on JAARS network-mapped volumes, the RobustFile.Replace fails
// See https://silbloom.myjetbrains.com/youtrack/issue/BL-3222
if (RobustFile.Exists(destinationFilePath))
{
if (RobustFile.Exists(backupFilePath))
{
RobustFile.Delete(backupFilePath);
}
RobustFile.Move(destinationFilePath, backupFilePath);
RobustFile.Delete(destinationFilePath);
}
RobustFile.Move(sourceFilePath, destinationFilePath);
}
}