void DeleteFile(string path, FailureOptions options, RetryTracker retry, CancellationToken cancel)
{
if (string.IsNullOrWhiteSpace(path))
{
return;
}
retry.Reset();
while (retry.Try())
{
cancel.ThrowIfCancellationRequested();
try
{
if (File.Exists(path))
{
if (retry.IsNotFirstAttempt)
{
File.SetAttributes(path, FileAttributes.Normal);
}
File.Delete(path);
}
break;
}
catch (Exception ex)
{
if (retry.CanRetry())
{
if (retry.ShouldLogWarning())
{
Log.VerboseFormat("Retry #{0} on delete file '{1}'. Exception: {2}", retry.CurrentTry, path, ex.Message);
}
Thread.Sleep(retry.Sleep());
}
else
{
if (options == FailureOptions.ThrowOnFailure)
{
throw;
}
}
}
}
}
public void ShouldThrowOnceRetriesExceeded()
{
const int retries = 100;
var subject = new RetryTracker(100, null, new RetryInterval(100, 200, 2));
Exception caught = null;
var retried = 0;
try
{
while (subject.Try())
{
try
{
throw new Exception("Blah");
}
catch
{
if (subject.CanRetry())
{
//swallow exception
retried++;
}
else
{
throw;
}
}
}
}
catch (Exception ex)
{
caught = ex;
}
Assert.NotNull(caught);
Assert.AreEqual(retries, retried);
}
void PurgeDirectory(string targetDirectory, Predicate <IFileSystemInfo> exclude, FailureOptions options, CancellationToken cancel, bool includeTarget = false, RetryTracker retry = null)
{
exclude = exclude ?? (fi => false);
if (!DirectoryExists(targetDirectory))
{
return;
}
retry = retry ?? GetFileOperationRetryTracker();
foreach (var file in EnumerateFiles(targetDirectory))
{
cancel.ThrowIfCancellationRequested();
var includeInfo = new FileSystemInfoAdapter(new FileInfo(file));
if (exclude(includeInfo))
{
continue;
}
DeleteFile(file, options, retry, cancel);
}
foreach (var directory in EnumerateDirectories(targetDirectory))
{
cancel.ThrowIfCancellationRequested();
var info = new DirectoryInfo(directory);
var includeInfo = new FileSystemInfoAdapter(info);
if (exclude(includeInfo))
{
continue;
}
if ((info.Attributes & FileAttributes.ReparsePoint) == FileAttributes.ReparsePoint)
{
Directory.Delete(directory, false);
}
else
{
PurgeDirectory(directory, exclude, options, cancel, true, retry);
}
}
if (includeTarget && DirectoryIsEmpty(targetDirectory))
{
DeleteDirectory(targetDirectory, options);
}
}