private List <IComparableFile[]> FindSync(
IReadOnlyCollection <FileData> srcFiles,
ICandidatePredicate duplicateCandidatePredicate,
IComparableFileFactory comparableFileFactory,
CancellationToken cancellationToken)
{
//var stopwatch = Stopwatch.StartNew();
var duplicateCandidates = new List <IComparableFile[]>(256);
var fileIndex = 0;
var filesCount = srcFiles.Count;
var candidatesTotalSize = 0L;
var candidateFilesCount = 0;
foreach (var currentFile in srcFiles)
{
try
{
bool IsCurrentFileAlreadyAdded(IComparableFile[] candidatesSet)
{
foreach (var candidateFile in candidatesSet)
{
if (ReferenceEquals(candidateFile.FileData, currentFile))
{
return(true);
}
}
return(false);
}
if (duplicateCandidates.AsParallel().Any(IsCurrentFileAlreadyAdded))
{
continue;
}
var candidates = srcFiles
.AsParallel()
.WithCancellation(cancellationToken)
.Where(file => duplicateCandidatePredicate.IsCandidate(file, currentFile))
.ToArray();
var candidatesLength = candidates.Length;
if (candidatesLength < 2)
{
continue;
}
var candidatesGroup = new IComparableFile[candidatesLength];
for (var index = 0; index < candidatesLength; index++)
{
var candidateFileData = candidates[index];
candidatesGroup[index] = comparableFileFactory.Create(candidateFileData);
candidatesTotalSize += candidateFileData.Size;
}
candidateFilesCount += candidatesLength;
duplicateCandidates.Add(candidatesGroup);
}
catch (OperationCanceledException)
{
throw;
}
catch (Exception ex)
{
OnFileSystemError(currentFile.FullName, ex);
}
finally
{
OnScanningPath(currentFile.FullName, fileIndex++, filesCount, duplicateCandidates.Count, candidateFilesCount, candidatesTotalSize);
}
}
//stopwatch.Stop();
//var elapsed = TimeSpan.FromMilliseconds(stopwatch.ElapsedMilliseconds);
//System.Windows.MessageBox.Show($"Candidates search time: {elapsed:c}");
return(duplicateCandidates);
}
public async Task <List <IComparableFile[]> > Find(IReadOnlyCollection <FileData> srcFiles, ICandidatePredicate duplicateCandidatePredicate, IComparableFileFactory comparableFileFactory, CancellationToken cancellationToken)
{
return(await Task.Run(() => FindSync(srcFiles, duplicateCandidatePredicate, comparableFileFactory, cancellationToken), cancellationToken));
}
