public void SetUp()
{
_delayIntervalInSeconds = 0;
_parsedResult = null;
DirectoryUtility.EnsureClearFolder(FolderName);
}
public void DeserializeCache_FromSerializedCache_CacheIsCorrect()
{
//Arrange
List<FileSystemItem> items = new List<FileSystemItem>
{
new FileSystemItem("name1", "folder1"),
new FileSystemItem("C:\\")
};
DateTime dateTime = DateTime.Now;
FileSystemCache cache = new FileSystemCache(items, dateTime);
_serializer.SerializeCache(cache);
//Act
FileSystemCache actualCache = _serializer.DeserializeCache();
//Assert
//Serialization does not preserve milliseconds, so we use epsilon check.
Assert.That(dateTime - actualCache.LastFullScanTime, Is.LessThan(new TimeSpan(0, 0, 1)));
Assert.That(actualCache.Items.Count, Is.EqualTo(2));
Assert.That(actualCache.Items[0].FullPath, Is.EqualTo(Path.GetFullPath("folder1")));
Assert.That(actualCache.Items[0].Name, Is.EqualTo("name1"));
Assert.That(actualCache.Items[1].FullPath, Is.EqualTo(Path.GetFullPath("C:\\")));
Assert.That(actualCache.Items[1].Name, Is.EqualTo(""));
}
public void DeserializeCache_WithExistingCacheAndChanges_CacheIsCorrect()
{
//Arrange
List<FileSystemItem> cacheItems = new List<FileSystemItem>
{
new FileSystemItem("name1", "folder1"),
new FileSystemItem("name1", "folder2"),
new FileSystemItem("C:\\")
};
FileSystemCache cache = new FileSystemCache(cacheItems, DateTime.Now.AddDays(-2));
_serializer.SerializeCache(cache);
List<FileSystemChangeEventArgs> changeItems = new List<FileSystemChangeEventArgs>
{
new FileSystemChangeEventArgs("folder1", null),
new FileSystemChangeEventArgs(null, "folder3"),
new FileSystemChangeEventArgs("folder2", "folder4")
};
DateTime dateTime = DateTime.Now;
FileSystemChanges changes = new FileSystemChanges { Changes = changeItems, LastFullScanTime = dateTime };
_serializer.SerializeCacheChanges(changes);
//Act
FileSystemCache actualCache = _serializer.DeserializeCache();
//Assert
//Serialization does not preserve milliseconds, so we use epsilon check.
Assert.That(dateTime - actualCache.LastFullScanTime, Is.LessThan(new TimeSpan(0, 0, 1)));
Assert.That(actualCache.Items.Count, Is.EqualTo(3));
Assert.That(actualCache.Items[0].FullPath, Is.EqualTo(Path.GetFullPath("C:\\")));
Assert.That(actualCache.Items[0].Name, Is.EqualTo(""));
Assert.That(actualCache.Items[1].FullPath, Is.EqualTo(Path.GetFullPath("folder3")));
Assert.That(actualCache.Items[1].Name, Is.EqualTo("folder3"));
Assert.That(actualCache.Items[2].FullPath, Is.EqualTo(Path.GetFullPath("folder4")));
Assert.That(actualCache.Items[2].Name, Is.EqualTo("folder4"));
}
private void ParseFileSystem()
{
//Don't set any restrictions on this parsing, as want to grab the entire system.
List<FileSystemItem> fileSystemItems = _fileSystemParser.GetSubFolders();
_fileSystem = new FileSystemCache(fileSystemItems, DateTime.Now);
}
private List<FileSystemItem> ReadCache(bool appRunOnStartup, out bool fullCacheUpToDate, out bool cacheFolderCreated, out DateTime lastFullScanTime)
{
cacheFolderCreated = false;
//Parse file system
FileSystemCache fullCache = _cacheSerializer.DeserializeCache();
if (fullCache != null)
{
//The cache file can be up to date only if the current Navigation Assistant has been run on startup
//and if it had been closed just on system shutdown and the current parser is created at application start.
//In this case no additional folders can be created during NavAssistant being inactive.
fullCacheUpToDate = CacheUpToDate(fullCache) && appRunOnStartup;
}
else
{
//The application is loaded for the first time (no cache stored on disk).
string cacheFolder = GetCacheFolder();
bool cacheFolderExisted = Directory.Exists(cacheFolder);
//Run this method in the main thread, thus freezing it.
//Don't set any restrictions on this parsing, as want to grab the entire system.
fullCache = new FileSystemCache(_fileSystemParser.GetSubFolders(), DateTime.Now);
_cacheSerializer.SerializeCache(fullCache);
//Updating the cache if cache folder has been created
bool cacheFolderExists = Directory.Exists(cacheFolder);
cacheFolderCreated = !cacheFolderExisted && cacheFolderExists;
fullCacheUpToDate = true;
}
List<FileSystemItem> filteredCache = FilterCache(fullCache);
lastFullScanTime = fullCache.LastFullScanTime;
fullCache = null;
GC.Collect();
return filteredCache;
}
private List<FileSystemItem> FilterCache(FileSystemCache fullCache)
{
return (fullCache != null && fullCache.Items != null)
? _fileSystemFilter.FilterItems(fullCache.Items)
: new List<FileSystemItem>();
}
private bool CacheUpToDate(FileSystemCache cache)
{
DateTime lastShutDownTime = _registryService.GetLastSystemShutDownTime();
DateTime lastCacheWriteTime = cache.LastFullScanTime;
TimeSpan timeDifference = lastShutDownTime - lastCacheWriteTime;
bool cacheValid = timeDifference.TotalSeconds < CacheValidityPeriodInSeconds;
return cacheValid;
}
private FileSystemCache ReadCache()
{
string[] lines = File.ReadAllLines(_cacheFilePath);
List<FileSystemItem> items = lines.Skip(1).Select(ParseCacheItem).Where(i => i != null).ToList();
DateTime lastFullScanTime = DateTime.Parse(lines[0], CultureInfo.InvariantCulture);
FileSystemCache cache = new FileSystemCache(items, lastFullScanTime);
return cache;
}
public void SerializeCache(FileSystemCache cache)
{
if (cache == null || cache.Items == null)
{
throw new ArgumentNullException("cache");
}
//File system path can not contain ?, so this format is not ambiguous
List<string> lines = cache.Items.Select(GetCacheItemLine).ToList();
lines.Insert(0, cache.LastFullScanTime.ToString(CultureInfo.InvariantCulture));
lock (CacheSync)
{
DirectoryUtility.EnsureFolder(Path.GetDirectoryName(_cacheFilePath));
File.WriteAllLines(_cacheFilePath, lines.ToArray());
if (File.Exists(_cacheChangesFilePath))
{
File.Delete(_cacheChangesFilePath);
}
}
GC.Collect();
}
private void HandleParsingFinished(object sender, ItemEventArgs<FileSystemCache> e)
{
lock (_parsingSync)
{
_parsedResult = e.Item;
_parsingFinish = DateTime.Now;
}
}
