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Code Issues Projects Releases Wiki Activity

Fixed: Performance issue when scanning large root folder

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This commit is contained in:
Qstick
2020-07-26 21:23:10 +01:00
parent 90b59a56e1
commit 9c096aae10
4 changed files with 106 additions and 95 deletions
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7
src/NzbDrone.Common/Disk/DiskProviderBase.cs
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@@ -149,6 +149,13 @@ namespace NzbDrone.Common.Disk
}
}
public bool FolderEmpty(string path)
{
Ensure.That(path, () => path).IsValidPath();
return _fileSystem.Directory.EnumerateFileSystemEntries(path).Empty();
}
public string[] GetDirectories(string path)
{
Ensure.That(path, () => path).IsValidPath();

1
src/NzbDrone.Common/Disk/IDiskProvider.cs
View File

@@ -22,6 +22,7 @@ namespace NzbDrone.Common.Disk
bool FileExists(string path);
bool FileExists(string path, StringComparison stringComparison);
bool FolderWritable(string path);
bool FolderEmpty(string path);
string[] GetDirectories(string path);
string[] GetFiles(string path, SearchOption searchOption);
long GetFolderSize(string path);

158
src/NzbDrone.Core.Test/MediaFiles/DiskScanServiceTests/ScanFixture.cs
View File

@@ -24,18 +24,18 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
[TestFixture]
public class ScanFixture : FileSystemTest<DiskScanService>
{
private Author _artist;
private Author _author;
private string _rootFolder;
private string _otherArtistFolder;
private string _otherAuthorFolder;
[SetUp]
public void Setup()
{
_rootFolder = @"C:\Test\Music".AsOsAgnostic();
_otherArtistFolder = @"C:\Test\Music\OtherArtist".AsOsAgnostic();
_otherAuthorFolder = @"C:\Test\Music\OtherArtist".AsOsAgnostic();
var artistFolder = @"C:\Test\Music\Artist".AsOsAgnostic();
_artist = Builder<Author>.CreateNew()
_author = Builder<Author>.CreateNew()
.With(s => s.Path = artistFolder)
.Build();
@@ -76,7 +76,7 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
private void GivenArtistFolder()
{
GivenRootFolder(_artist.Path);
GivenRootFolder(_author.Path);
}
private List<IFileInfo> GivenFiles(IEnumerable<string> files, DateTimeOffset? lastWrite = null)
@@ -104,7 +104,7 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
}
Mocker.GetMock<IMediaFileService>()
.Setup(x => x.GetFilesWithBasePath(_artist.Path))
.Setup(x => x.GetFilesWithBasePath(_author.Path))
.Returns(files.Select(x => new BookFile
{
Path = x,
@@ -115,12 +115,12 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
[Test]
public void should_not_scan_if_root_folder_does_not_exist()
{
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
ExceptionVerification.ExpectedWarns(1);
Mocker.GetMock<IDiskProvider>()
.Verify(v => v.FolderExists(_artist.Path), Times.Never());
.Verify(v => v.FolderExists(_author.Path), Times.Never());
Mocker.GetMock<IMediaFileTableCleanupService>()
.Verify(v => v.Clean(It.IsAny<string>(), It.IsAny<List<string>>()), Times.Never());
@@ -134,12 +134,12 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
{
GivenRootFolder();
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
ExceptionVerification.ExpectedWarns(1);
Mocker.GetMock<IDiskProvider>()
.Verify(v => v.FolderExists(_artist.Path), Times.Never());
.Verify(v => v.GetFiles(_author.Path, SearchOption.AllDirectories), Times.Never());
Mocker.GetMock<IMediaFileTableCleanupService>()
.Verify(v => v.Clean(It.IsAny<string>(), It.IsAny<List<string>>()), Times.Never());
@@ -151,11 +151,11 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
[Test]
public void should_clean_if_folder_does_not_exist()
{
GivenRootFolder(_otherArtistFolder);
GivenRootFolder(_otherAuthorFolder);
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
DiskProvider.FolderExists(_artist.Path).Should().BeFalse();
DiskProvider.FolderExists(_author.Path).Should().BeFalse();
Mocker.GetMock<IMediaFileTableCleanupService>()
.Verify(v => v.Clean(It.IsAny<string>(), It.IsAny<List<string>>()), Times.Once());
@@ -168,11 +168,11 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, "file1.mobi"),
Path.Combine(_artist.Path, "s01e01.mobi")
Path.Combine(_author.Path, "file1.mobi"),
Path.Combine(_author.Path, "s01e01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 2), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -185,14 +185,14 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, "EXTRAS", "file1.mobi"),
Path.Combine(_artist.Path, "Extras", "file2.mobi"),
Path.Combine(_artist.Path, "EXTRAs", "file3.mobi"),
Path.Combine(_artist.Path, "ExTrAs", "file4.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "EXTRAS", "file1.mobi"),
Path.Combine(_author.Path, "Extras", "file2.mobi"),
Path.Combine(_author.Path, "EXTRAs", "file3.mobi"),
Path.Combine(_author.Path, "ExTrAs", "file4.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 1), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -205,12 +205,12 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, ".AppleDouble", "file1.mobi"),
Path.Combine(_artist.Path, ".appledouble", "file2.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, ".AppleDouble", "file1.mobi"),
Path.Combine(_author.Path, ".appledouble", "file2.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 1), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -219,21 +219,21 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
[Test]
public void should_scan_extras_artist_and_subfolders()
{
_artist.Path = @"C:\Test\Music\Extras".AsOsAgnostic();
_author.Path = @"C:\Test\Music\Extras".AsOsAgnostic();
GivenArtistFolder();
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, "Extras", "file1.mobi"),
Path.Combine(_artist.Path, ".AppleDouble", "file2.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e02.mobi"),
Path.Combine(_artist.Path, "Season 2", "s02e01.mobi"),
Path.Combine(_artist.Path, "Season 2", "s02e02.mobi"),
Path.Combine(_author.Path, "Extras", "file1.mobi"),
Path.Combine(_author.Path, ".AppleDouble", "file2.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e02.mobi"),
Path.Combine(_author.Path, "Season 2", "s02e01.mobi"),
Path.Combine(_author.Path, "Season 2", "s02e02.mobi"),
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 4), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -246,10 +246,10 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, "Album 1", ".t01.mobi")
Path.Combine(_author.Path, "Album 1", ".t01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 1), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -262,13 +262,13 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, ".@__thumb", "file1.mobi"),
Path.Combine(_artist.Path, ".@__THUMB", "file2.mobi"),
Path.Combine(_artist.Path, ".hidden", "file2.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, ".@__thumb", "file1.mobi"),
Path.Combine(_author.Path, ".@__THUMB", "file2.mobi"),
Path.Combine(_author.Path, ".hidden", "file2.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 1), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -281,14 +281,14 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, "Season 1", ".@__thumb", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", ".@__THUMB", "file2.mobi"),
Path.Combine(_artist.Path, "Season 1", ".hidden", "file2.mobi"),
Path.Combine(_artist.Path, "Season 1", ".AppleDouble", "s01e01.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "Season 1", ".@__thumb", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", ".@__THUMB", "file2.mobi"),
Path.Combine(_author.Path, "Season 1", ".hidden", "file2.mobi"),
Path.Combine(_author.Path, "Season 1", ".AppleDouble", "s01e01.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 1), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -301,11 +301,11 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, "@eaDir", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "@eaDir", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 1), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -318,11 +318,11 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, ".@__thumb", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, ".@__thumb", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 1), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -331,17 +331,17 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
[Test]
public void should_scan_dotHack_folder()
{
_artist.Path = @"C:\Test\Music\.hack".AsOsAgnostic();
_author.Path = @"C:\Test\Music\.hack".AsOsAgnostic();
GivenArtistFolder();
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, "Season 1", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "Season 1", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 2), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -354,12 +354,12 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
GivenFiles(new List<string>
{
Path.Combine(_artist.Path, ".DS_STORE"),
Path.Combine(_artist.Path, "._24 The Status Quo Combustion.mobi"),
Path.Combine(_artist.Path, "24 The Status Quo Combustion.mobi")
Path.Combine(_author.Path, ".DS_STORE"),
Path.Combine(_author.Path, "._24 The Status Quo Combustion.mobi"),
Path.Combine(_author.Path, "24 The Status Quo Combustion.mobi")
});
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMakeImportDecision>()
.Verify(v => v.GetImportDecisions(It.Is<List<IFileInfo>>(l => l.Count == 1), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()), Times.Once());
@@ -372,7 +372,7 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
.Returns((List<IFileInfo> fileList, IdentificationOverrides idOverrides, ImportDecisionMakerInfo idInfo, ImportDecisionMakerConfig idConfig) =>
fileList.Select(x => new LocalBook
{
Author = _artist,
Author = _author,
Path = x.FullName,
Modified = x.LastWriteTimeUtc,
FileTrackInfo = new ParsedTrackInfo()
@@ -386,15 +386,15 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
{
var files = new List<string>
{
Path.Combine(_artist.Path, "Season 1", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "Season 1", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
};
GivenFiles(files);
GivenKnownFiles(new List<string>());
GivenRejections();
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMediaFileService>()
.Verify(x => x.AddMany(It.Is<List<BookFile>>(l => l.Select(t => t.Path).SequenceEqual(files))),
@@ -406,15 +406,15 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
{
var files = new List<string>
{
Path.Combine(_artist.Path, "Season 1", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "Season 1", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
};
GivenFiles(files);
GivenKnownFiles(files.GetRange(1, 1));
GivenRejections();
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMediaFileService>()
.Verify(x => x.AddMany(It.Is<List<BookFile>>(l => l.Select(t => t.Path).SequenceEqual(files.GetRange(0, 1)))),
@@ -426,15 +426,15 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
{
var files = new List<string>
{
Path.Combine(_artist.Path, "Season 1", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "Season 1", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
};
GivenFiles(files);
GivenKnownFiles(files);
GivenRejections();
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMediaFileService>()
.Verify(x => x.AddMany(It.Is<List<BookFile>>(l => l.Count == 0)),
@@ -450,15 +450,15 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
{
var files = new List<string>
{
Path.Combine(_artist.Path, "Season 1", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "Season 1", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
};
GivenFiles(files);
GivenKnownFiles(files);
GivenRejections();
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMediaFileService>()
.Verify(x => x.Update(It.Is<List<BookFile>>(l => l.Count == 0)),
@@ -474,15 +474,15 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
{
var files = new List<string>
{
Path.Combine(_artist.Path, "Season 1", "file1.mobi"),
Path.Combine(_artist.Path, "Season 1", "s01e01.mobi")
Path.Combine(_author.Path, "Season 1", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "s01e01.mobi")
};
GivenFiles(files, new DateTime(2019, 2, 1));
GivenKnownFiles(files);
GivenRejections();
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMediaFileService>()
.Verify(x => x.Update(It.Is<List<BookFile>>(l => l.Count == 2)),
@@ -494,7 +494,7 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
{
var files = new List<string>
{
Path.Combine(_artist.Path, "Season 1", "file1.mobi"),
Path.Combine(_author.Path, "Season 1", "file1.mobi"),
};
GivenKnownFiles(files);
@@ -516,7 +516,7 @@ namespace NzbDrone.Core.Test.MediaFiles.DiskScanServiceTests
.Setup(x => x.GetImportDecisions(It.IsAny<List<IFileInfo>>(), It.IsAny<IdentificationOverrides>(), It.IsAny<ImportDecisionMakerInfo>(), It.IsAny<ImportDecisionMakerConfig>()))
.Returns(new List<ImportDecision<LocalBook>> { new ImportDecision<LocalBook>(localTrack, new Rejection("Reject")) });
Subject.Scan(new List<string> { _artist.Path });
Subject.Scan(new List<string> { _author.Path });
Mocker.GetMock<IMediaFileService>()
.Verify(x => x.Update(It.Is<List<BookFile>>(

35
src/NzbDrone.Core/MediaFiles/DiskScanService.cs
View File

@@ -102,25 +102,28 @@ namespace NzbDrone.Core.MediaFiles
return;
}
if (!_diskProvider.FolderExists(rootFolder.Path))
{
_logger.Warn("Root folder {0} doesn't exist.", rootFolder.Path);
var folderExists = _diskProvider.FolderExists(folder);
var skippedArtists = _authorService.GetAuthors(authorIds);
skippedArtists.ForEach(x => _eventAggregator.PublishEvent(new AuthorScanSkippedEvent(x, AuthorScanSkippedReason.RootFolderDoesNotExist)));
return;
if (!folderExists)
{
if (!_diskProvider.FolderExists(rootFolder.Path))
{
_logger.Warn("Authors' root folder ({0}) doesn't exist.", rootFolder);
var skippedAuthors = _authorService.GetAuthors(authorIds);
skippedAuthors.ForEach(x => _eventAggregator.PublishEvent(new AuthorScanSkippedEvent(x, AuthorScanSkippedReason.RootFolderDoesNotExist)));
return;
}
if (_diskProvider.FolderEmpty(rootFolder.Path))
{
_logger.Warn("Authors' root folder ({0}) is empty.", rootFolder);
var skippedAuthors = _authorService.GetAuthors(authorIds);
skippedAuthors.ForEach(x => _eventAggregator.PublishEvent(new AuthorScanSkippedEvent(x, AuthorScanSkippedReason.RootFolderIsEmpty)));
return;
}
}
if (_diskProvider.GetDirectories(rootFolder.Path).Empty())
{
_logger.Warn("Root folder {0} is empty.", rootFolder.Path);
var skippedArtists = _authorService.GetAuthors(authorIds);
skippedArtists.ForEach(x => _eventAggregator.PublishEvent(new AuthorScanSkippedEvent(x, AuthorScanSkippedReason.RootFolderIsEmpty)));
return;
}
if (!_diskProvider.FolderExists(folder))
if (!folderExists)
{
_logger.Debug("Specified scan folder ({0}) doesn't exist.", folder);